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A random sample of 136 observations produced a sample mean of 33. Find the critical and observed values of z for the following test of

A random sample of 136 observations produced a sample mean of 33. Find the critical and observed values ofzfor the following test of hypothesis using=0.02.

The population standard deviation is known to be 8 and the population distribution is normal.

H0:=28

versusH1:28.

Round your answers to two decimal places.

z_{critical left}=

z_{critical right}=

z_observed=

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