Question: A random sample of136observations produced a sample mean of31. Find the critical and observed values of z for the following test of hypothesis using=0.05. The

A random sample of136observations produced a sample mean of31. Find the critical and observed values ofzfor the following test of hypothesis using=0.05.

The population standard deviation is known to be6and the population distribution is normal.

H0:=28

versusH1:>28.

Round your answers to two decimal places.

zcritical=

zobserved=

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