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A random sample of 75 individuals shows an average income of $54,165 per year. We know from previous research that the standard deviation for income
A random sample of 75 individuals shows an average income of $54,165 per year. We know from previous research that the standard deviation for income is 22,205. I hypothesize that the true population mean for income is $50,860 per year. What is the z-statistic for this hypothesis?
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