Question: A random sample of 80 observations produced a sample mean of 86.50. Find the critical and observed values of z for each of the following

A random sample of 80 observations produced a sample mean of 86.50. Find the critical and observed values of z for each of the following tests of hypothesis using .10. The population standard deviation is known to be 7.20.
a. H0: µ = 91 versus H1: µ ≠ 91
b. H0: µ = 91 versus H1: µ < 91

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