Nagy_ BUS207.920 CRN14246 EXAM-4

# Nagy_ BUS207.920 CRN14246 EXAM-4 - BUS207.920 17[120 points...

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88268d883668ac14ed6f2b821bcbe4fbcddd8914.xls 1 of 13 printed on:05/07/2009 BUS207.920 NAME__Chris Nagy_________________________ Chapters 12, 13 17 [120 points] 15-Dec-07 4 points each unless otherwise stated. EXAM #4 9.01 numerator and four in the denominator. Use a two-tailed test and the 0.10 level of significance. F>3.68 10 oil stocks was 12.6 percent with a standard deviation of 3.9 percent. The mean rate of return on a sample of 8 utility stocks was 10.9 percent withat a satandard deviation of 3.5 percent. At the 0.05 significance level, can we conclude that there is more vairation in the oil stocks? [b] Identify the test statistic. exceeds 3.68 [c] Interpret your results. do not reject the null hypothesis since the computed /f value is less than the critical value treatment means are equal. Use the 0.05 significance level. Treatment 1 Treatment 2 Treatment 3 [b] 8 3 3 [c] Sources SS df MS F 6 2 4 Treatments 62.167 2 31.083 21.941 10 4 5 Treatments 12.750 9 1.417 9 3 4 Total 74.917 11 [b] Identify the test statistic. [c] Complete an ANOVA table. [d] State your decision regarding the null hypothesis. [d] reject the null hypothesis of private colleges in various regions of the United States. At the 0.05 level of significance, can we conclude there is a difference in the mean tuition rates for the various regions? West (\$000) 10 8 7 [b] 11 9 8 [c] 12 10 6 Sources SS df MS F P-value 10 8 7 Treatments 44.164 2 22.082 25.435 0.000 12 6 Treatments 9.550 11 0.868 Total 53.714 13 [b] Identify the test statistic. [c] Complete an ANOVA table. [d] State your decision regarding the null hypothesis. [d] reject the null hypothesis tuition in the Northeast and that of the West? If so, develop a 95% confidence interval for that difference. [1] What is the critical F Value for a sample of six observations in the [2] A stockbroker at Critical Securities reported that the mean rate of return on a sample of [a] [3 points] State the null and alternate hypothesis. H 0 : σ 1 2 = σ 2 2 H 1 : σ 1 2 ≠ σ 2 2 Reject H 0 if the sample variances s 1 2 /s 2 2 = 1.24 [3] The following is sample information. Test the hypothesis that the [a] H 0 : μ 1 = μ 2 = μ 3 H 1 : not all means are the same reject H 0 if F > 4.26 [a] [3 points] State the null and alternate hypothesis. [4] The following data are the semester tuition charges (\$000) for a sample Northeast (\$000) Southeast (\$000) [a] H 0 : μ 1 = μ 2 = μ 3 H 1 : not all means are the same reject H 0 if F > 3.98 [a] [3 points] State the null and alternate hypothesis.

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