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To compare the effect of stress caused by noise on the ability to perform a simple...

To compare the effect of stress caused by noise on the ability to perform a simple task, 72 subjects were divided into two groups—31 subjects as a control group, and 41 subjects as the experimental group. Although each subject performed the task, the experimental group had to perform the task while loud rock music was played. The time to finish the task was recorded for each subject and the following summary was obtained.

Control Experimental
n 31 41
x 19 minutes 27 minutes
s 5 minutes 11 minutes

a) Find a 99% confidence interval for the difference in mean completion times (in minutes) for these two groups. (Calculate the difference as the control group − the experimental group. Round your answers to two decimal places.)

________ min to ___________ min

math   Statistics-And-Probability   
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Answer #1

x, = 19 X = 27 n=1931 n2=hl S = to $ - 11 991. Confidence interval X - Xz) t IS tale S(x-x2) f where tale is the (42) th Redc

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