Shana wants to know if coffee will help students perform better on Latin tests. Forty of her friends have volunteered to participate in her study. She randomly assigns 20 friends to drink water and 20 to drink coffee. All 40 participants take the same math test. She calculates the mean for each group and determines that the mean for the coffee group was 80% and the mean for the water group was 85%. 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 Shana conclude from her study?

Question

anonymous · Answer

The difference in the means is not significant because a difference of 5 is not very likely. 

 The difference in the means is significant because a difference of 5 is very likely. 

 The difference in the means is significant because a difference of 5 is not very likely. 

 The difference in the means is not significant because a difference of 5 is very likely.

anonymous · Answer

@jim_thompson5910 @Hero @dumbmathstudent

anonymous · Answer

@Preetha