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A survey of CPAs across the United States found that the average net income for sole- proprietor CPAs is $99,500. Because this survey is over a decade old, an accounting analyst wants to test whether the net income figure has changed or not. A random sample of 120 CPAs produced a mean salary of $101,220. Assume that the population standard deviation of salaries is =$14,530. ( known case two-tailed test Z statistic). a. Test the hypothesis test using the critical value approach at the significance level = 0.01 (Show mathematical steps in detail) b. Interpret the results..

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A survey of CPAs across the United States found that the average net income for sole- proprietor CPAs is $99,500. Because this survey is over a decade old, an accounting analyst wants to test whether the net income figure has changed or not. A random sample of 120 CPAs produced a mean salary of $101,220. Assume that the population standard deviation of salaries is =$14,530. ( known case two-tailed test Z statistic). a. Test the hypothesis test using the critical value approach at the significance level = 0.01 (Show mathematical steps in detail) b. Interpret the results.

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  • 1. A survey of CPAs across the United States found that the average net income for sole- proprietor CPAs is $99,500. Because this survey is over a decade old, an accounting analyst wants to test whether the net income figure has changed or not. A random sample of 120 CPAs produced a mean salary of $101,220. Assume that the population standard deviation of salaries is =$14,530. ( known case two-tailed test Z statistic). a. Test the hypothesis test using the critical value approach at the significance level = 0.01 (Show mathematical steps in detail) b. Interpret the results.