Question

Lars wants to know if warming up will help runners sprint faster. Twenty-four track and field athletes volunteered to participate in his study. He randomly assigns 12 athletes to warm-up for 10 minutes. All 24 participants sprint the same distance. He calculates the mean for each group and determines that the mean for the warm-up group was 7.8 seconds and the mean for the other group was 9.8 seconds. To test the difference of means, he re-randomized the data 54 times and the differences are plotted in the dot plot below. What can Lars conclude from her study?

Answer 1

The difference in the means is significant because a difference of 2 is very likely.
The difference in the means is significant because a difference of 2 is not very likely.
The difference in the means is not significant because a difference of 2 is not very likely.
The difference in the means is not significant because a difference of 2 is very likely.

Answer 2

I have A but not 100% sure

Answer 3

hmm well 6/54 times we say a different of 2 in their means

Answer 4

Don't know what to say about it, confusing question

Answer 5

it depends on what you want to say is likely

Answer 6

but 6/54 is on the less likely of things

Answer 7

whats weird though is that it doesnt look symmetrical across 0

Answer 8

would it be 10/54?

Answer 9

10/54 is 2 and more

Answer 10

difference

Answer 11

7/54 is 2 exactly

Answer 12

I'm really not sure

Answer 13

@dtan5457