Common Core: High School - Statistics and Probability : High School: Statistics & Probability

Study concepts, example questions & explanations for Common Core: High School - Statistics and Probability

varsity tutors app store varsity tutors android store

All Common Core: High School - Statistics and Probability Resources

3 Diagnostic Tests 70 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #151 : High School: Statistics & Probability

Use technology to find the least squares regression equation for the following data set.

Possible Answers:

Correct answer:

Explanation:

In order to solve this problem, we need to define what is meant by the phrase 'least squares regression equation.' Essentially, the least squares regression equation is the equation of the best-fit line of the data if it were graphed on a scatter plot. Trend lines for data that possess a linear relationship are typically written in the slope-intercept form. This form is commonly written using the equation:

In this equation, the variables are represented in the following manner:

Problems associated with this standard require us to use technology such as statistical programs or calculators to find the least squares regression equation. Essentially, we must use technology to calculate the slope and y-intercept of a group of data points. Let's first use an example to illustrate this process. Consider the following data set:

Table example

In order to solve this example and calculate the least squares regression equation, we need to insert the data into a spreadsheet program either using copy/paste techniques or manual entry. The data should look like the following figure:

Table example 2

After the data has been entered into the program, we can use formulas to calculate the slope and y-intercept needed for the least squares regression equation. The slope is calculated using the formula outlined in the red box on the following figure. In this equation, the range of cells in column B represents the y-values while cells from column A denote the x-values.

The number one at the end of the equation designates the specific statistic that we wish to calculate. In this case, one means the slope.

Slope with technology

We can see that the slope of the least squares regression equation is the following:

Now, let's calculate the y-intercept. It is calculated by using the formula outlined in the red box of the following figure. Again, column B represents the y-values while cells from column A denote the x-values.

The number two at the end of the equation designates the specific statistic that we wish to calculate. In this case, two means the y-intercept.

Y intercept with technology

We can see that the y-intercept of the least squares regression equation is the following:

Now, we can write the least squares regression equation:

We can check this answer by graphing the points on a scatter plot and fitting it with a trendline.

Check with technology

We can see that the answers are the same. Now, we have learned how to find the least squares regression equation using technology. Let's use this information to solve the given problem. When we insert the data into a statistical program we can calculate the following information:

y-intercept= 
slope= 
Let's input this information into a least squares regression equation in the slope intercept format:

Substitute in our calculated values and solve.

Example Question #5 : Fit A Linear Function For A Scatter Plot: Ccss.Math.Content.Hss Id.B.6c

Use technology to find the least squares regression equation for the following data set.

Possible Answers:

Correct answer:

Explanation:

In order to solve this problem, we need to define what is meant by the phrase 'least squares regression equation.' Essentially, the least squares regression equation is the equation of the best-fit line of the data if it were graphed on a scatter plot. Trend lines for data that possess a linear relationship are typically written in the slope-intercept form. This form is commonly written using the equation:

In this equation, the variables are represented in the following manner:

Problems associated with this standard require us to use technology such as statistical programs or calculators to find the least squares regression equation. Essentially, we must use technology to calculate the slope and y-intercept of a group of data points. Let's first use an example to illustrate this process. Consider the following data set:

Table example

In order to solve this example and calculate the least squares regression equation, we need to insert the data into a spreadsheet program either using copy/paste techniques or manual entry. The data should look like the following figure:

Table example 2

After the data has been entered into the program, we can use formulas to calculate the slope and y-intercept needed for the least squares regression equation. The slope is calculated using the formula outlined in the red box on the following figure. In this equation, the range of cells in column B represents the y-values while cells from column A denote the x-values.

The number one at the end of the equation designates the specific statistic that we wish to calculate. In this case, one means the slope.

Slope with technology

We can see that the slope of the least squares regression equation is the following:

Now, let's calculate the y-intercept. It is calculated by using the formula outlined in the red box of the following figure. Again, column B represents the y-values while cells from column A denote the x-values.

The number two at the end of the equation designates the specific statistic that we wish to calculate. In this case, two means the y-intercept.

Y intercept with technology

We can see that the y-intercept of the least squares regression equation is the following:

Now, we can write the least squares regression equation:

We can check this answer by graphing the points on a scatter plot and fitting it with a trendline.

Check with technology

We can see that the answers are the same. Now, we have learned how to find the least squares regression equation using technology. Let's use this information to solve the given problem. When we insert the data into a statistical program we can calculate the following information:

y-intercept= 
slope= 
Let's input this information into a least squares regression equation in the slope intercept format:

Substitute in our calculated values and solve.

Example Question #151 : High School: Statistics & Probability

Use technology to find the least squares regression equation for the following data set.

Possible Answers:

Correct answer:

Explanation:

In order to solve this problem, we need to define what is meant by the phrase 'least squares regression equation.' Essentially, the least squares regression equation is the equation of the best-fit line of the data if it were graphed on a scatter plot. Trend lines for data that possess a linear relationship are typically written in the slope-intercept form. This form is commonly written using the equation:

In this equation, the variables are represented in the following manner:

Problems associated with this standard require us to use technology such as statistical programs or calculators to find the least squares regression equation. Essentially, we must use technology to calculate the slope and y-intercept of a group of data points. Let's first use an example to illustrate this process. Consider the following data set:

Table example

In order to solve this example and calculate the least squares regression equation, we need to insert the data into a spreadsheet program either using copy/paste techniques or manual entry. The data should look like the following figure:

Table example 2

After the data has been entered into the program, we can use formulas to calculate the slope and y-intercept needed for the least squares regression equation. The slope is calculated using the formula outlined in the red box on the following figure. In this equation, the range of cells in column B represents the y-values while cells from column A denote the x-values.

The number one at the end of the equation designates the specific statistic that we wish to calculate. In this case, one means the slope.

Slope with technology

We can see that the slope of the least squares regression equation is the following:

Now, let's calculate the y-intercept. It is calculated by using the formula outlined in the red box of the following figure. Again, column B represents the y-values while cells from column A denote the x-values.

The number two at the end of the equation designates the specific statistic that we wish to calculate. In this case, two means the y-intercept.

Y intercept with technology

We can see that the y-intercept of the least squares regression equation is the following:

Now, we can write the least squares regression equation:

We can check this answer by graphing the points on a scatter plot and fitting it with a trendline.

Check with technology

We can see that the answers are the same. Now, we have learned how to find the least squares regression equation using technology. Let's use this information to solve the given problem. When we insert the data into a statistical program we can calculate the following information:

y-intercept= 
slope= 
Let's input this information into a least squares regression equation in the slope intercept format:

Substitute in our calculated values and solve.

 

Example Question #152 : High School: Statistics & Probability

Use technology to find the least squares regression equation for the following data set.

Possible Answers:

Correct answer:

Explanation:

In order to solve this problem, we need to define what is meant by the phrase 'least squares regression equation.' Essentially, the least squares regression equation is the equation of the best-fit line of the data if it were graphed on a scatter plot. Trend lines for data that possess a linear relationship are typically written in the slope-intercept form. This form is commonly written using the equation:

In this equation, the variables are represented in the following manner:

Problems associated with this standard require us to use technology such as statistical programs or calculators to find the least squares regression equation. Essentially, we must use technology to calculate the slope and y-intercept of a group of data points. Let's first use an example to illustrate this process. Consider the following data set:

Table example

In order to solve this example and calculate the least squares regression equation, we need to insert the data into a spreadsheet program either using copy/paste techniques or manual entry. The data should look like the following figure:

Table example 2

After the data has been entered into the program, we can use formulas to calculate the slope and y-intercept needed for the least squares regression equation. The slope is calculated using the formula outlined in the red box on the following figure. In this equation, the range of cells in column B represents the y-values while cells from column A denote the x-values.

The number one at the end of the equation designates the specific statistic that we wish to calculate. In this case, one means the slope.

Slope with technology

We can see that the slope of the least squares regression equation is the following:

Now, let's calculate the y-intercept. It is calculated by using the formula outlined in the red box of the following figure. Again, column B represents the y-values while cells from column A denote the x-values.

The number two at the end of the equation designates the specific statistic that we wish to calculate. In this case, two means the y-intercept.

Y intercept with technology

We can see that the y-intercept of the least squares regression equation is the following:

Now, we can write the least squares regression equation:

We can check this answer by graphing the points on a scatter plot and fitting it with a trendline.

Check with technology

We can see that the answers are the same. Now, we have learned how to find the least squares regression equation using technology. Let's use this information to solve the given problem. When we insert the data into a statistical program we can calculate the following information:

y-intercept= 
slope= 
Let's input this information into a least squares regression equation in the slope intercept format:

Substitute in our calculated values and solve.

 

Example Question #153 : High School: Statistics & Probability

Use technology to find the least squares regression equation for the following data set.

Possible Answers:

Correct answer:

Explanation:

In order to solve this problem, we need to define what is meant by the phrase 'least squares regression equation.' Essentially, the least squares regression equation is the equation of the best-fit line of the data if it were graphed on a scatter plot. Trend lines for data that possess a linear relationship are typically written in the slope-intercept form. This form is commonly written using the equation:

In this equation, the variables are represented in the following manner:

Problems associated with this standard require us to use technology such as statistical programs or calculators to find the least squares regression equation. Essentially, we must use technology to calculate the slope and y-intercept of a group of data points. Let's first use an example to illustrate this process. Consider the following data set:

Table example

In order to solve this example and calculate the least squares regression equation, we need to insert the data into a spreadsheet program either using copy/paste techniques or manual entry. The data should look like the following figure:

Table example 2

After the data has been entered into the program, we can use formulas to calculate the slope and y-intercept needed for the least squares regression equation. The slope is calculated using the formula outlined in the red box on the following figure. In this equation, the range of cells in column B represents the y-values while cells from column A denote the x-values.

The number one at the end of the equation designates the specific statistic that we wish to calculate. In this case, one means the slope.

Slope with technology

We can see that the slope of the least squares regression equation is the following:

Now, let's calculate the y-intercept. It is calculated by using the formula outlined in the red box of the following figure. Again, column B represents the y-values while cells from column A denote the x-values.

The number two at the end of the equation designates the specific statistic that we wish to calculate. In this case, two means the y-intercept.

Y intercept with technology

We can see that the y-intercept of the least squares regression equation is the following:

Now, we can write the least squares regression equation:

We can check this answer by graphing the points on a scatter plot and fitting it with a trendline.

Check with technology

We can see that the answers are the same. Now, we have learned how to find the least squares regression equation using technology. Let's use this information to solve the given problem. When we insert the data into a statistical program we can calculate the following information:

y-intercept= 
slope= 
Let's input this information into a least squares regression equation in the slope intercept format:

Substitute in our calculated values and solve.

 

Example Question #11 : Fit A Linear Function For A Scatter Plot: Ccss.Math.Content.Hss Id.B.6c

Use technology to find the least squares regression equation for the following data set.

Screen shot 2015 12 18 at 4.35.26 pm

Possible Answers:

Correct answer:

Explanation:

In order to solve this problem, we need to define what is meant by the phrase "least squares regression equation." Essentially, the least squares regression equation is the equation of the best-fit line of the data if it were graphed on a scatter plot. Trend lines for data that possess a linear relationship are typically written in the slope intercept form. This form is commonly written using the equation:

In this equation, the variables are represented in the following manner:

In order to solve this question and calculate the least squares regression equation, we need to insert the data into a spreadsheet program either using copy/paste techniques or manual entry. The data should look like the following figure. 

Screen shot 2016 01 12 at 3.46.09 pm

After the data has been entered into the program, we can use formulas to calculate the slope and y-intercept needed for the least squares regression equation. The slope is calculated using the formula outlined in the red box on the following figure. In this equation the range of cells in column B represents the y-values while cells from column A denote the x-values.

The number one at the end of the equation designates the specific statistic that we wish to calculate. In this case, one means the slope.

Slope with technology

We can see that the slope of the least squares regression equation is the following:

Now, let's calculate the y-intercept. It is calculated by using the formula outlined in the red box of the following figure. Again, column B represents the y-values while cells from column A denote the x-values.

The number two at the end of the equation designates the specific statistic that we wish to calculate. In this case, one means the y-intercept.

Y intercept with technology

We can see that the y-intercept of the least squares regression equation is the following:

Now, we can write the least squares regression equation:

We can check this answer by graphing the points on a scatter plot and fitting it with a trendline.

Check with technology

We can see that the answers are the same. Now, we have calculated how to find the least squares regression equation using technology.

Example Question #151 : High School: Statistics & Probability

A professor conducts a study on the relationship between sleep and academic performance by asking his 420 students how many hours of sleep they missed while studying for the class final.

The regression output is as follows:

Which of the following statements is TRUE?

Possible Answers:

The average score on the final is 696.52 points.

The average score on the final is 698.8 points.

For every additional hour of sleep missed, the number of points scored on the final decreases by 2.28 points.

The regression equation itself proves that the results are statistically significant.

Sleep has no effect on academic performance.

Correct answer:

For every additional hour of sleep missed, the number of points scored on the final decreases by 2.28 points.

Explanation:

 

 

 

Example Question #1 : Interpret Slope And Intercept Of A Linear Model: Ccss.Math.Content.Hss Id.C.7

Identify the slope of the following line:

Y x 1

Possible Answers:

Correct answer:

Explanation:

This question asks us to analyze the constituent components of a linear equation written in the slope intercept formula:

This formula provides information about two key parts of a line: the slope and y-intercept.

The slope is commonly defined as rise over run. In other words it is the change in y-values across points divided by the change in x-values. It is calculated using the following formula:

In this formula, the x and y-values come from two points from the line written in the following format: 

It is important to note that slopes can be positive or negative. A positive slope moves upward from left to right while a negative slope moves downward.

Now, lets solve the problem. We will start by identifying two points on the line. Lets observe the point where the line crosses the x-axis and the point to where it crosses , positive five, on the x-axis.  

These two points are:

Now, substitute these numbers into the slope formula.

The slope is positive because the line moves upward from left to right.

We find that the slope of the equation is one. We can also calculate the slope by using the traditional "rise over run" definition. If we count blocks on the graph we can see that for every six blocks that it "rises," it "runs" six blocks. In other words, the slope increases one block in the x-direction as it increases one block in the y-direction; therefore, the slope is one (see figure below).

Y x 1 slope

Example Question #1 : Interpret Slope And Intercept Of A Linear Model: Ccss.Math.Content.Hss Id.C.7

Identify the y-intercept of the following line:

Y x 1

Possible Answers:

Correct answer:

Explanation:

This question asks us to analyze the constituent components of a linear equation written in the slope-intercept formula:

This formula provides information about two key parts of a line: the slope and y-intercept.

The y-intercept represents the point where the line intersects the y-axis. We can identify the y-intercept by locating it on the graph (see the red circle in the figure below).

Y x 1 intercept

The y-intercept is located at the following point:

They correct y-intercept is as follows:

Example Question #2 : Interpret Slope And Intercept Of A Linear Model: Ccss.Math.Content.Hss Id.C.7

Identify the slope of the following line:

Y x 1

Possible Answers:

Correct answer:

Explanation:

This question asks us to analyze the constituent components of a linear equation written in the slope-intercept formula:

This formula provides information about two key parts of a line: the slope and y-intercept.

The slope is commonly defined as rise over run. In other words, it is the change in y-values across points divided by the change in x-values. It is calculated using the following formula:

In this formula, the x- and y-values come from two points from the line written in the following format: 

It is important to note that slopes can be positive or negative. A positive slope moves upward from left to right while a negative slope moves downward.

Now, lets solve the problem. We will start by identifying two points on the line. Lets observe the point where the line crosses the x-axis and the point to where it crosses , positive five, on the x-axis. 

These two points are:

Now, substitute these numbers into the slope formula.

The slope is positive because the line moves upward from left to right.

We have calculated that the slope of the equation is one. We can also calculate the slope by using the traditional "rise over run" definition. If we count blocks on the graph, then we can see that for every six blocks that it "rises," it "runs" six blocks. In other words, the slope increases one block in the x-direction as it increases one block in the y-direction; therefore, the slope is one (see figure below).

Y x 1 slope

All Common Core: High School - Statistics and Probability Resources

3 Diagnostic Tests 70 Practice Tests Question of the Day Flashcards Learn by Concept
Learning Tools by Varsity Tutors