Statistics & Probability Flashcard Deck

Question 1

What is the mean?

Accepted Answer

The average of all values in a dataset

Question 2

What is the median?

Accepted Answer

The middle value when data is arranged in order

Question 3

What is the standard deviation?

Accepted Answer

A measure of how spread out data points are from the mean

Question 4

What is a normal distribution?

Accepted Answer

A bell-shaped probability distribution that is symmetric about the mean

Question 5

What is the empirical rule (68-95-99.7)?

Accepted Answer

68\% within 1\sigma, 95\% within 2\sigma, 99.7\% within 3\sigma of the mean

Question 6

What is the mode?

Accepted Answer

The value that appears most frequently in a dataset

Question 7

What is variance?

Accepted Answer

The average of squared differences from the mean

Question 8

What is correlation?

Accepted Answer

A measure of linear relationship between two variables

Question 9

What is a p-value?

Accepted Answer

The probability of obtaining results at least as extreme as observed

Question 10

What is the central limit theorem?

Accepted Answer

Sample means approach normal distribution as sample size increases

Statistics & Probability