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Chapter 09, Section 9.2, Problem 020b A random sample of 102
observations produced a sample mean of 31. Find the critical and
observed values of z for the following test of hypothesis using
α=0.05. The population standard deviation is known to be 6 and the
population distribution is normal. H0: μ=28 versus H1: μ>28.
Round your answers to two decimal places. zcritical = zobserved
=
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