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Assume the student commuting time to the IUPUI campus is normally distributed. To build a 95%...

Assume the student commuting time to the IUPUI campus is normally distributed. To build a 95% confidence interval for the mean commuting time for all IUPUI students, a random sample of n = 5 students provided the following times (shown in minutes).

x
10
20
25
30
15

The variance of the mean x̅ ?

The margin or error for a 95% interval estimate is?

In the previous question to obtain a 95% margin of error of ±2 minutes, what is the minimum sample size? For planning value round the standard deviation from the sample data above to the nearest integer. ?

Math   Statistics-And-Probability   
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