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Unformatted text preview: STA 3024 Exam 2 Sample Questions Note: Several sample exam questions covered material from the last few pages of Chapter 6, which we won’t have time to cover. I’ve left those questions out, but I’ve kept the original question numbers for the remaining questions so that I don’t have to redo the answer key. 1. In the twoway ANOVA F test for interaction, which of the following corresponds to a large pvalue? (A) a large value of the test statistic (B) data that gives little or no evidence that there is interaction (C) both (A) and (B) (D) neither (A) nor (B) 2. This question covered material ineligible for inclusion on the exam. 3. In twoway ANOVA, it is appropriate to perform the tests for main effects only if we conclude that (A) it’s reasonable that there is no interaction. (B) there is interaction. 4. In a twoway ANOVA F test for the main effect of Factor A, if there are two categories of Factor A, four categories of Factor B, and 16 total observations, what value of the test statistic F A would correspond to a pvalue of 0.05? (A) 3.63 (B) 4.46 (C) 4.49 (D) 4.96 (E) 5.32 5. A data set produces the twoway ANOVA table shown below. Source df SS MS Factor A 4 7.974 1.993 Factor B 1 0.240 0.240 Interaction 4 1.174 0.293 Error 35 8.777 0.251 Total 44 18.165 Which of the following is true? (A) This table does not give us enough information to conclude anything about any of the assumptions of the twoway ANOVA F tests. (B) This table gives us enough information to conclude that at least one of the assumptions of the twoway ANOVA F tests is violated. (C) This table gives us enough information to conclude that all of the assumptions of the twoway ANOVA F tests are satisfied. 6. Suppose a data set yields the twoway ANOVA table shown below. Source df SS MS Factor A 3 112.56 37.52 Factor B 1 304.98 304.98 Interaction 3 10.08 3.36 Error 16 294.27 18.39 Total 23 721.89 Calculate the test statistic for the twoway ANOVA F test for the main effect of Factor B. (A) 1.04 (B) 16.58 (C) 36.36 (D) 79.55 (E) 90.77 7. The population means of the four groups in a twoway ANOVA setup with two categories of each factor are shown below. Sodium Intake Gender High Low Male 2.2 3.1 Female 2.8 4.8 True or false: There is interaction. (A) True (B) False 8. In a oneway ANOVA F test for data with three groups and 33 total observations, suppose we calculate a test statistic value of F = 4 . 29 . Then the pvalue of the test is (A) less than 0.05. (B) greater than 0.05. 9. Suppose a data set yields the twoway ANOVA table shown below. (Some items are intentionally missing.) Source df SS MS Factor A 1 2.18 Factor B 2 1.66 Interaction 2 6.33 Error 30 Total 28.58 Calculate MS E ....
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This note was uploaded on 12/15/2011 for the course STA 3024 taught by Professor Ta during the Spring '08 term at University of Florida.
 Spring '08
 TA
 Statistics

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