Question: A random sample of 128 observations produced a sample mean of 31. Find the critical and observed values of z for the following test of

A random sample of 128 observations produced a sample mean of 31. Find the critical and observed values of z for the following test of hypothesis using =0.02. The population standard deviation is known to be 7 and the population distribution is normal.

H0:=28 versus H1:28.

Round your answers to two decimal places.

z_{critical left} =

z_{critical right} =

z_observed =

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