- A simple random sample of 70 customers is taken from a customer
information file and the average age is 36. The population standard
deviation σ is unknown. Instead the sample standard deviation s is
also calculated from the sample and is found to be 4.5.
(6 points)
- Test the hypothesis that the population mean age is greater
than 33 using
the critical value approach and a
0.05 level of significance.
- Test the hypothesis that the population mean age is less than
38 using the
p-value approach and a 0.05 level of
significance.
- Test the hypothesis that the population mean age is different
from 32
using the p-value approach and a 0.05
level of significance.