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A sample mean, sample size, and population standard deviation are given. Use the one - mean z - test to perform the required hypothesis test

A sample mean, sample size, and population standard deviation are given. Use the one-mean z-test to perform the required hypothesis test at the given significance level. Use the P-value approach.

9) x=21,n=18, =7, H0:=24,Ha:<24,=0.05 9)

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