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Chapter 15 (in-chapter quizzes)

Terms in this set (18)

The 2 x 2 two-way independent groups design has two DVs/IVs, each of which has 1/2/4 levels, and the design has a total of 1/2/4 groups.
IVs; 2; 4.
A factorial design includes all combinations of the means/levels/differences of all DVs/IVs.
levels; IV's
The main effect of independent variable A is
a. its effect at the main level of independent variable B.
b. the difference between the effect of A at the two levels of B.
c. the mean of its main level.
d. the overall effect of A, averaged over the two levels of B.
d.
In a 2 × 2 independent groups design, independent variable A has df = _____, independent variable B has df = _____, and the interaction has df = _____.
1; 1; 1
In a 2 × 2 independent groups design, the interaction is
a. the difference between the two main effects.
b. the extent that the effect of independent variable A is different at the two levels of independent variable B.
c. the average of the A difference and the B difference.
d. a nuisance, usually of no interest to the researcher.
b.
Our general approach to analyzing the data from a study with an extended design is to choose __________ that correspond with the research questions, and for each one to calculate the __________ and its __________ as the basis for interpretation.
contrasts; mean; CI
To analyze an independent groups design, we usually assume __________ of variance across all __________.
homogeneity; groups
That assumption is probably reasonable if
a. considering the group SDs, the largest SD is no more than about twice the smallest.
b. considering all pairs of groups, all the correlations are heterogeneous. c. the group means are all related in a linear fashion.
d. the DV has interval scaling.
a.
In a 2 × 2 factorial design, there is little or no interaction if the dotted lines joining means
a. differ in slope but don't cross.
b. differ greatly in slope and cross.
c. are close to parallel.
d. meet, or almost meet, at a point.
c.
A simple main / subsidiary effect is the correlation / effect of one IV at a single level / mean of another IV.
main; effect; single level
In a 2 × 2 RCT, the figure showing the 4 means and CIs allows us to assess comparisons that involve only the between-groups / within-group IV, but not comparisons that involve the between-groups / within-group IV.
between-groups; within-group IV.
In an RCT, the interaction is likely to be estimated with greater precision if the correlation / difference of the DV at different levels of the repeated measure is lower / higher.
correlation; higher
A two-way design with just one group of participants has 1 IV / 2 IVs / 4 IVs, each of which is a between-groups / within-group IV.
2 IVs; within-group IV
A solid line joining means in a figure indicates an IV that is between-groups / a repeated measure, which is likely to give increased / decreased precision for effects involving its means.
repeated measure; increased
Where possible, it's usually best to focus on effects for which df = ____. These may include simple __________ effects and 1 × 1 / 2 × 2 / 3 × 2 interactions.
1; main; 2 x 2
For an IV with more than 2 levels, consider
a. running a different study instead. b. averaging over some levels to obtain contrasts with df = 1.
c. using comparisons of means that have df greater than 1.
d. None of the above.
b.
With k means, no more than _______ separate questions can be asked, so planned analysis should specify no more than about _______ contrasts.
k-1; k-1
When ANOVA of a two-way study finds an interaction to have p = .004, a. the main effects are likely to be large.
b. we have strong evidence that the effect of one IV is different at different levels of the other IV.
c. most likely, the effect of one IV is quite similar at all levels of the other IV.
d. the two IVs are likely to show the same, or close to the same, patterns of means
b.
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