Aj Davis Part B

947 WordsFeb 28, 20134 Pages
AJ Davis Department Store Project Part B: Hypothesis Testing and Confidence Intervals A. The average (mean) annual income was less than $50,000 • Null Hypothesis is the average annual income is ≥ to $50,000. o Ho: µ ≥ 50,000 • Alternate Hypothesis is the average annual income is < than $50,000. o Ha: µ < 50,000 • Analysis Plan significance level is: a = 0.05 • n > 30 the z test was used to test the hypothesis • Alternative Hypothesis Ha: µ ≥ 50,000, this means the test is a one tailed z test. Critical Value and Decision Rule • C.V: a = 0.05 the lower tailed z test is 1.645 • D.R: reject Ho if z – statistic is -1.645 Sample Z using Minitab: • Income…show more content…
viation = 5.103 N Mean SE Mean 95% CI Z P 50 13.000 0.722 (11.586, 14.414) 0.86

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