Question

Elaine wants to know if coffee will help students perform better on English tests. Twenty-four of her friends have volunteered to participate in her study. She randomly assigns 12 friends to drink water and 12 to drink coffee. All 24 participants take the same math test. She calculates the mean for each group and determines that the mean for the coffee group was 93% and the mean for the water group was 90%. To test the difference of means, she re-randomized the data 100 times, and the differences are plotted in the dot plot below. What can Emily conclude from her study?

Answer 1

@phi

Answer 2

@iPwnBunnies

Answer 3

@Hero