Quiz Over 2nd Half of
Chapter 13 (pp. 292310) of the
6^{th} Edition
TwoWay Analyses of Variance
NOTE: A different quiz covers the 1st half of Chapter 13 (pages 276292.)
FollowUp Tests
 (T/F) If none of the twoway ANOVA's Fs turns out to be significant,
no followup tests will be conducted.
 Followup tests can be used to "probe" significant main effects ___
(and/but not) significant interactions.
FollowUp Tests to Probe Significant Main Effects
 (T/F) In Excerpt 13.9, the significant main effect of vignette required no
followup investigation because there were only 2 levels of the vignette factor.
 In Excerpt 13.10, how many Tukey pairwise tests were conducted?
 If post hoc tests are used to probe the significant main effects
of a 2x3 ANOVA, how many null hypotheses will be tested?
FollowUp Tests to Probe a Significant Interaction
 (T/F) Researchers usually refrain from interpreting the main effect
Fratios if the interaction is significant.
 In the middle portion of Figure 13.1, which Source(s) would be "ns"
if the cell mean of 5 is changed to 35?
 In a graph of a cell means, the ordinate and abscissa are usually
labeled with the names of ______ & ______.
 If statistically significant interaction is graphed, the lines in
the graph ___ (will/won't) be parallel.
 Comparing cell means that lie in individual rows and/or individual
columns is a test of _____ _____ _____.
 In Excerpt 13.11, there would have been less interaction if the High/NC
group had ended up with a mean equal to
 120
 150
 210
 300
 If the interaction from Excerpt 13.12 were to be displayed in a graph like that
shown in Excerpt 13.11, how many lines would be in the graph?
 In Excerpt 13.12, the means involved in each Tukey test that was
conducted were ______ (cell/main effect) means.
 If the followup strategy used Excerpt 13.13 had been used in Excerpt
13.12, a total of __ pairwise comparisons would have been made.
Planned Comparisons
 In twoway ANOVAs, planned comparisons ___ (can/can't) be done if
the interaction is not significant.
 In Excerpt 13.14, the planned comparison was _____ (pairwise/nonpairwise) in nature.
Assumptions Associated With a TwoWay ANOVA
 (T/F) The assumptions of a twoway ANOVA are the same as those associated
with a oneway ANOVA.
 Violations of the equal variance assumptions of a twoway ANOVA are
more disruptive when the __'s differ.
 (T/F) In testing the normality and equal variance assumptions, researchers
hope for nonsignificant results.
 Hartley's Fmax test focuses on which assumption, normality or
homogeneity of variance?
 If the normality or equal variance assumption seems untenable, the
researcher can either ____ or ____.
 The term "____" means that a statistical tests functions as it should
even if the assumptions are violated.
 An Ftest is considered to be ____ (positively/negatively) biased
if it turns out larger than it should.
Estimating Effect Size and Conducting Power Analyses in TwoWay ANOVAs
 Twoway ANOVAs ___ (can/can't) yield results that have statistical
but no practical significance.
 (T/F) Excerpt 13.18 illustrates the fact that a single index of "practical significance"
is computed for any twoway ANOVA, not individual indices for each main effect and
the interaction.
 It's better to do a power analysis ____ (before/after) the data are
collected and analyzed.
 (T/F) A strengthofeffect index can be computed for each main effect
F and for the interaction F.
 The two most commonly used strengthofeffect measures are called
_____ and _____.
 Most researchers ___ (do/don't) distinguish between statistical and
practical significance in 2way ANOVAs.
The Inflated Type I Error Rate in Factorial ANOVAs
 (T/F) Since a 2way ANOVA with 1 dependent variable yields 3 Ftests,
most researchers divide a by 3.
 If a researcher sets a equal to .05 when
evaluating each of the 3 Ftests, the "______" error rate is equal to
.05.
 The chances of a _____ (Type I/Type II) error will be increased if a researcher
conducts 2 or more twoway ANOVAs without using the Bonferroni adjustment
procedure (or some other procedure) to adjust alpha.
A Few Warnings Concerning TwoWay ANOVAs
 (T/F) If the research questions are not worth investigating, there's
a fatal flaw in the study than cannot be salvaged by a twoway
ANOVA . . . even if all assumptions are met and all analyses are properly
executed.
 In Excerpt 13.9, the researchers report that "... the participants who read
the weightrelated teasing vignette reported significantly more negative affect
(M = 15.75, SD = 4.99) than did those who read the neutral vignette
(M = 13.87, SD = 3.42)." Do the reported SDs suggest the
presence of "overlapping distributions"?
 (T/F) Because a twoway ANOVA is so powerful, its Ftests never lead
to either Type I or Type II errors.
 (T/F) If the main effect means for one of the factors in a
twoway ANOVA turn out to be identical, the null hypothesis associated
with that particular factor should be considered to be true (i.e., fully
accepted).
Click here for answers.
NOTE: Questions dealing with
the 1st half of Chapter 13 appear on a separate quiz.
