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Unformatted text preview: 1. In a one-way ANOVA, if the computed F statistic exceeds the critical F value we may A) not reject H since there is no evidence of a difference. B) not reject H because a mistake has been made. C) reject H since there is evidence of a treatment effect. D) reject H since there is evidence all the means differ. 2. Which of the following components in an ANOVA table are not additive? A) sum of squares B) It is not possible to tell. C) degrees of freedom D) mean squares 3. TABLE 11-1 Psychologists have found that people are generally reluctant to transmit bad news to their peers. This phenomenon has been termed the "MUM effect." To investigate the cause of the MUM effect, 40 undergraduates at Duke University participated in an experiment. Each subject was asked to administer an IQ test to another student and then provide the test taker with his or her percentile score. Unknown to the subject, the test taker was a bogus student who was working with the researchers. The experimenters manipulated two factors: subject visibility and success of test taker , each at two levels. Subject visibility was either visible or not visible to the test taker. Success of the test taker was either visible or not visible to the test taker. Success of the test taker was either top 20% or bottom 20% . Ten subjects were randomly assigned to each of the 2 x 2 = 4 experimental conditions, then the time (in seconds) between the end of the test and the delivery of the percentile score from the subject to the test taker was measured. (This variable is called the latency to feedback .) The data were subjected to appropriate analyses with the following results. Referring to Table 11-1, what type of experimental design was employed in this study? A) Completely randomized design with 4 treatments B) 2 x 2 factorial design with 10 replications C) Randomized block design with four treatments and 10 blocks D) None of the above 4. Why would you use the Tukey-Kramer procedure? A) to test for homogeneity of variance B) to test for normality C) to test for differences in pairwise means D) to test independence of errors 5. Interaction in an experimental design can be tested in A) a randomized block model. B) all ANOVA models. C) a two-factor model. D) a completely randomized model. 6. TABLE 11-2 An airline wants to select a computer software package for its reservation system. Four software packages (1, 2, 3, and 4) are commercially available. The airline will choose the package that bumps as few passengers, on the average, as possible during a month. An experiment is set up in which each package is used to make average, as possible during a month....
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- Winter '11