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Unformatted text preview: 86 Analysis of Variance CHAPTER 11: ANALYSIS OF VARIANCE 1. In a oneway ANOVA, if the computed F statistic exceeds the critical F value we may a) reject H since there is evidence all the means differ. b) reject H since there is evidence of a treatment effect. c) not reject H since there is no evidence of a difference. d) not reject H because a mistake has been made. ANSWER: b TYPE: MC DIFFICULTY: Easy KEYWORDS: oneway analysis of variance, decision 2. Which of the following components in an ANOVA table are not additive? a) Sum of squares. b) Degrees of freedom. c) Mean squares. d) It is not possible to tell. ANSWER: c TYPE: MC DIFFICULTY: Easy KEYWORDS: oneway analysis of variance, sum of squares, properties 3. Why would you use the TukeyKramer procedure? a) To test for normality. b) To test for homogeneity of variance. c) To test independence of errors. d) To test for differences in pairwise means. ANSWER: d TYPE: MC DIFFICULTY: Easy KEYWORDS: TukeyKramer procedure 4. A completely randomized design a) has only one factor with several treatment groups. b) can have more than one factor, each with several treatment groups. c) has one factor and one block. d) has one factor and one block and multiple values. ANSWER: a TYPE: MC DIFFICULTY: Moderate KEYWORDS: completely randomized design 5. The F test statistic in a oneway ANOVA is a) MSW/MSA. b) SSW/SSA. c) MSA/MSW. d) SSA/SSW. 87 Analysis of Variance ANSWER: c TYPE: MC DIFFICULTY: Easy KEYWORDS: oneway analysis of variance, F test for factor 6. The degrees of freedom for the F test in a oneway ANOVA are a) ( n c ) and ( c 1). b) ( c 1) and ( n c ). c) ( c n ) and ( n 1). d) ( n 1) and ( c n ). ANSWER: b TYPE: MC DIFFICULTY: Easy KEYWORDS: oneway analysis of variance, degrees of freedom 7. In a oneway ANOVA, the null hypothesis is always a) there is no treatment effect. b) there is some treatment effect. c) all the population means are different. d) some of the population means are different. ANSWER: a TYPE: MC DIFFICULTY: Easy KEYWORDS: oneway analysis of variance, form of hypothesis 8. In a oneway ANOVA a) an interaction term is present. b) an interaction effect can be tested. c) there is no interaction term. d) the interaction term has ( c 1)( n 1) degrees of freedom. ANSWER: c TYPE: MC DIFFICULTY: Moderate KEYWORDS: oneway analysis of variance, properties, interaction 9. Interaction in an experimental design can be tested in a) a completely randomized model. b) a randomized block model. c) a twofactor model. d) all ANOVA models. ANSWER: c TYPE: MC DIFFICULTY: Easy KEYWORDS: twofactor analysis of variance, interaction, properties 10. In a twoway ANOVA the degrees of freedom for the interaction term is a) ( r 1)( c 1)....
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 Fall '07
 Reich
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