1.A random sample of 126 observations produced a sample mean of 32. Find the critical and observed values ofzfor the following test of hypothesis using=0.01.

The population standard deviation is known to be 5 and the population distribution is normal.

H0:=28

versusH1:28.

Round your answers to two decimal places.

2.A random sample of 112 observations produced a sample mean of 33. Find the critical and observed values ofzfor the following test of hypothesis using=0.1.

The population standard deviation is known to be 6 and the population distribution is normal.

H0:=28

versusH1:>28.

Round your answers to two decimal places.