Please help ASAP

Question

Please help ASAP

anonymous · Answer

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?

anonymous · Answer

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.

anonymous · Answer

how much time left for you exam question honey? :)

anonymous · Answer

it's not timed.. but I would like to get it done :)