sp98ex2c - COURSE: MSCI 3710.003 EXAM 2 Version C SEMESTER:...

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COURSE: MSCI 3710.003 Print Name: EXAM 2 Signature: Version C S.S.#: SEMESTER: Spring 1998 Seat Number: Note: Whenever question(s) are connected you may be asked to assume a result (given a value) from the previous question but this result may or may not be correct. This is to prevent you from losing points on a second question because you made a mistake on a previous question.
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Use the information given in the paragraph below to answer the next six questions. Astral Airlines recently introduced a nonstop flight between Houston and Chicago. The vice president of marketing for Astral decided to run a test to see whether Astral’s passenger load was similar to that of its two major competitors. Nine daytime flights were picked at random from each of the three airlines and the percent of unfilled seats on each flight was as follows: Astral Competitor1 Competitor2 10 12 15 14 9 10 12 8 15 10 9 8 7 11 13 13 10 9 11 12 8 8 7 11 12 11 10 The vice president used the data to test the claim, at the .05 significance level, that there difference in the mean percent of unfilled seats among Astral and its two major competito results of the ANOVA (conducted at the α = .05 level) are shown in the partially filled table below. Anova: Single Factor SUMMARY Groups Count Sum Average Variance Astral 9 97 10.7778 5.19444 Competitor 1 9 89 9.88889 3.11111 Competitor 2 9 99 11 7.5 ANOVA Source of Variation SS df MS F P-value F crit Between Groups xxxxxxx 2 xxxxx xxxxx 0.5619 xxxxx Within Groups 126.4444444 xx xxxxx Total 132.6666667 26 1. Which of the following is the correct alternative hypothesis? A. Ha: the mean percent unfilled seats is not the same for all three airlines. B. Ha: the mean percent unfilled seats is the same for all three airlines. C. Ha: the mean percent unfilled seats for each of the three airlines is different from the others.
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D. Ha: the mean percent unfilled seats is least different for Competitor 1. E. Ha: the mean percent unfilled seats is mostly different for at least Competitor 2. 2. What is the calculated value of the test statistic to test the claim there is a difference in the percent unfilled seats for the three airlines? A 3.40 B. 5.27 C. 6.22 D 3.11 E. .591 3. What is the critical (table) value for the test in question #2? A 3.40 B. 5.27 C. 6.22 D 3.11 E. .591 4. What is the variation, as measured by the sum of squares, of the individual observations for each airline about their respective means? A. 6.22 B. 3.11 C. 126.44 D. 132.67 E. 5.27 5. What are the statistical decision and reason for the decision concerning the test in question #2? A.
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This note was uploaded on 03/09/2011 for the course DSCI 3710 taught by Professor Dr.jay during the Spring '08 term at North Texas.

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sp98ex2c - COURSE: MSCI 3710.003 EXAM 2 Version C SEMESTER:...

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