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Hypothesis testing in experiments

Giovanna usually takes bus BB to work, but now she thinks that bus AA gets her to work faster.
She randomized 5050 workdays between a treatment group and a control group. For each day from the treatment group, she took bus AA; and for each day from the control group, she took bus BB. Each day she timed the length of her drive.
The results of the experiment showed that the median travel duration for bus AA is 88 minutes less than the median travel duration for bus BB. To test whether the results could be explained by random chance, she created the table below, which summarizes the results of 10001000 re-randomizations of the data (with differences between medians rounded to the nearest 22 minutes).
According to the simulations, what is the probability of the treatment group's median being lower than the control group's median by 88 minutes or more?
  • Your answer should be
  • an integer, like 66
  • an exact decimal, like 0.750.75
  • a simplified proper fraction, like 3/53/5
  • a simplified improper fraction, like 7/47/4
  • a mixed number, like 1 3/41\ 3/4
  • a percent, like 12.34%12.34\%
Assume that if the probability you found is lower than 5%5\%, then the result should be considered significant.
What should we conclude regarding the experiment's result?
Choose 1 answer:
Choose 1 answer:
Treatment group median - Control group medianFrequency
10-1088
8-88585
6-69797
4-4161161
2-28383
00127127
229393
44159159
66107107
886262
10101818