3 Let x be the time in seconds for a rat to complete a maze

Let x be the time in seconds for a rat to complete a maze. Assume that the distribution of X is normal. If the sample size n=13, the sample z= 27.25, and the sample standard deviation s = 4.137, find a 90% confidence interval for mu if possible. Let x be the time in seconds for a rat to complete a maze. Assume that the distribution of x is highly . If the sample standard deviation a = 4.137, find a 90% confidence interval for mu possible.

Solution

3)

N Mean StDev SE Mean 90% CI
13 27.25 4.14 1.15 (25.21, 29.29)