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Hourly Fees A Random Sample of 15 Hourly Fees for Car Washers

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Hourly Fees
A random sample of 15 hourly fees for car washers (including tips)was drawn from a normal population.The sample mean and sample standard deviation were Hourly Fees A random sample of 15 hourly fees for car washers (including tips)was drawn from a normal population.The sample mean and sample standard deviation were = $14.9 and s = $6.75. ​ ​ -{Hourly Fees Narrative} Can we infer at the 5% significance level that the population mean is greater than 12,assuming that you know the population standard deviation is equal to 6.75? = $14.9 and s = $6.75. ​ ​
-{Hourly Fees Narrative} Can we infer at the 5% significance level that the population mean is greater than 12,assuming that you know the population standard deviation is equal to 6.75?

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Rejection region: z > z0.05 = 1.64...

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