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

is it A?

Answer 3

it's confusing

Answer 4

No idea. I am sorry.

Answer 5

@mathstudent55 can you please help

Answer 6

no one seems to know how to do this haha

Answer 7

@amistre64 @Nnesha

Answer 8

@kelliegirl33

Answer 9

any ideas haha?

Answer 10

I am not sure...Is he subtracting 9.8 from 7.8 or is he subtracting 7.8 from 9.8 ???