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7. A researcher wants to study study habits of all college students in the U.S. but collects data from 500 students at one university. The 500 students who provided data represent the:

11. A survey reports that “90% of students prefer online classes,” based on responses from 40 students surveyed in the computer science lab. Which is the most important concern when evaluating this result?

1. A nutrition researcher records the number of grams of sugar consumed per day by five participants: 30, 35, 40, 45, and 150 grams. She reports a single value that is calculated by adding all values and dividing by the number of participants. Which statistic is she reporting?

8. In a study examining the relationship between screen time and sleep, researchers record the number of hours participants spend on their phones each day. The number of hours of phone use is a:

4. In a drug trial, some participants receive a pill that looks identical to the medication being tested but contains no active ingredient.This pill is called a:

25. What is a residual in regression?

7. You flip a coin 50 times and get 48 heads. Why might this make you question the null hypothesis that the coin is fair?

3. Why is the null hypothesis called “null”?

19. A dataset shows that as temperature increases, ice cream sales increase. However, the points are widely scattered around the line. What does this suggest?

4. What is a Type I error?