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Hypothesis testing and confidence interval

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Reference no: EM132157515

Suppose the population standard deviation of $9k: (Hint: Hypothesis Testing and Confidence Interval - One sample; population standard deviation is known) 

(a) What is the Z critical value of 95% confidence interval?

(b) What is the standard error?

(c) Please estimate the confidence interval of the population's average salary (hint: write down the equation and calculate the results)

Reference no: EM132157515

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