Conduct a test of a hypothesis about a population mean
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At the time she was hired as a server at the Grumney Family Restaurant, Beth Brigden was told, “You can average $86 a day in tips.” Assume the population of daily tips is normally distributed with a standard deviation of $3.81. Over the first 48 days she was employed at the restaurant, the mean daily amount of her tips was $87.07. At the 0.02 significance level, can Ms. Brigden conclude that her daily tips average more than $86? a. State the null hypothesis and the alternate hypothesis.
H0: μ ≥ 86 ; H1: μ < 86 H0: μ ≤ 86 ; H1: μ > 86 H0: μ >86 ; H1: μ = 86 H0: μ = 86 ; H1: μ ≠ 86
b. State the decision rule.
Reject H1 if z < 2.05 Reject H0 if z > 2.05 Reject H1 if z > 2.05 Reject H0 if z < 2.05
c. Compute the value of the test statistic. (Round your answer to 2 decimal places.)
Value of the test statistic 13.54
d. What is your decision regarding H0?
Do not reject H0 Reject H0
e. What is the pvalue? (Round your answer to 4 decimal places.)
pvalue .0001
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