Homework_4

# B set up the anova table for this problem including

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b. Set up the ANOVA table for this problem including the test statistic. c. At 95% confidence, determine the critical value of F. d. Using the critical value approach, test to determine whether there is a significant difference in the means of the three populations.

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3. Guitars R. US has three stores located in three different areas. Random samples of the sales of the three stores (in \$1000) are shown below. Store 1 Store 2 Store 3 80 85 79 75 86 85 76 81 88 89 80 80 a. Compute the overall mean. b. State the null and alternative hypotheses to be tested. c. Show the complete ANOVA table for this test including the test statistic. d. The null hypothesis is to be tested at 95% confidence. Determine the critical value for this test. What do you conclude? 4. In order to compare the life expectancies of three different brands of printers, eight printers of each brand were randomly selected. Information regarding the three brands is shown below. Brand A Brand B Brand C Average life (in months) 62 52 60 Sample variance 36 25 49 a. Compute the overall mean. b. State the null and alternative hypotheses to be tested. c. Show the complete ANOVA table for this test including the test statistic. d. The null hypothesis is to be tested at 95% confidence. Determine the critical value for this test. What do you conclude?
5. Part of an ANOVA table involving 8 groups for a study is shown below. Source of Variation Sum of Squares Degrees of Freedom Mean Square F Between Treatments 126 _____? _____? _____? Within Treatments 240 _____? _____? (Error) Total _____? 67 a. Complete all the missing values in the above table and fill in the blanks. b. Use = 0.05 to determine if there is any significant difference among the means of the eight groups.
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• Spring '08
• Priya
• Null hypothesis, critical value, Allied Corporation

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