1707_20111128114348Z_Unit_4_Assignment_Solutions_(Student_Data).pdf

1707_20111128114348Z_Unit_4_Assignment_Solutions_(Student_Data).pdf

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Hyp Mean - One Sample (data) One Sample Hypothesis Test for the Mean PROBLEM 1 Null Hypothesis m = 3.5 Ho: Mean MBA GPA = 3.50 Level of Significance 0.05 Ha: Mean MBA GPA not equal to 3.50 Sample Size 200 Two-tailed test Sample Mean 3.42 With a p-value of .0003 < .05, reject the null hypothesis Standard Deviation 0.31 Conclude that the mean GPA is not 3.50. In fact, evidence shows the mean GPA to be less than 3.50 Test Statistic (Computed) -3.60 Direction of Test Lower Crit Value Upper Crit Value p -Value Decision Two-Tailed Test -1.9600 1.9600 0.0003 Reject the null hypothesis H1: m <> 3.5 Upper-Tail Test n/a 1.6449 0.9998 Do not reject the null hypothesis H1: m > 3.5 Lower-Tail Test -1.6449 n/a 0.0002 Reject the null hypothesis H1: m < 3.5 ©2007 DrJimMirabella.com If you REJECT the null hypothesis, conclude that H1 is true. If you DO NOT REJECT the null hypothesis, there is insufficient evidence to conclude that H1 is true. NEVER conclude that the null hypothesis is true (i.e., we CANNOT ACCEPT the null).
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