PSAT Reading & Writing Question of the Day
Test your knowledge with a hand-picked multiple-choice question.
A botanist tested a new fertilizer on 50 identical seedlings. Twenty-five received the fertilizer at each watering; the other twenty-five received only water. After four weeks, the average heights of the two groups were the same within the experiment's margin of error. The plants were grown in the same soil, under the same lights, and on identical watering schedules. Seedlings were randomly assigned to groups, and height measurements were taken by observers who did not know which plants had been fertilized. A second trial in a different room produced the same pattern, and no statistically significant difference in height appeared in either trial. These results indicate that, under the conditions tested, _______.
Which choice most logically completes the text?