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I dont understand how to determine what to use for a one-tailed or the two-tailed value. Do I use 1.64 or do I use 1.96?

Also, how do you know how to reject or accept a null hypothesis?


2. The same research team that thought it was such a brilliant idea to cause seasonal affective
disorder in mice thought it would be an even more brilliant idea to replicate their experiment. To
recap, if you look at population data on mice, they walk on average 20 feet per hour (the standard
deviation is 4 feet for the population. Our ever intrepid (and potentially cruel and sadistic)
research team once more rained on the cages of 49 experimental mice for nine months,
videotaping the activity of each mouse during that time. In this experiment, the mice averaged
18.8 feet per hour of walking.
Assume a significance level (p) of .05, and assume that this is a one-tailed test (low predicted).
Compute a Z test. Would the null hypothesis be accepted or rejected? What if a two-tailed test at
the same significance level (.05) had been run instead?

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