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Consider the following hypothesis test for the mean of a normally distributed population: Ho: μ=80. A...

Consider the following hypothesis test for the mean of a normally distributed population: Ho: μ=80. A random sample of size 40 is to be taken. The population standard deviation is 20. Write the rejection rule using critical value method; use α=4%. Please clearly identify the test-statistic (t or z or F etc).

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