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 10.8 seconds. To test the difference of means, he re-randomized the data 225 times and the differences are plotted in the dot plot below. What can Lars conclude from her study?

Answer 1

where's the data?

Answer 2

hold on im posting it now

Answer 3

@Dbzfan836

Answer 4

Hmm...She can conclude that warming up can improve speed, due to there being about half negative and zero, and half positive and zero.

Answer 5

The difference in the means is significant because a difference of 3 is very likely.

The difference in the means is significant because a difference of 3 is not very likely.

The difference in the means is not significant because a difference of 3 is not very likely.

The difference in the means is not significant because a difference of 3 is very likely

Answer 6

The first one

The difference in the means is significant because a difference of 3 is very likely

Answer 7

can u help me with more

Answer 8

Sure!