Question: A sample of 121 provided a sample mean of 77.3. The population standard deviation is known to be 16.5.
H0: μ ≥ 80
Ha: μ < 80
[A] Calculate the value of the test statistics.
[B] Find the p value and at 0.07 level of significance, test above hypothesis.
[C] Using the critical value approach at 0.07 level of significance, test hypothesis.