A researcher wanted to see how watching movies influenced subjects' IQ scores. She gave IQ tests to subjects following each of two movies. Half of the subjects first saw Titanic followed by Schindler's List, while the other half first saw Schindler's List and then Titanic. Varying the movie order is an example of
a. counterbalancing.
b. random sampling.
c. selection bias.
d. practice effects.
Question 2In a learning study using repeated measures, the correlation between early and later times will likely be low. Analyzing fewer levels of the independent variable would help to avoid violating the assumption of
a. normality.
b. homogeneity of variance.
c. constant correlations among pairs of levels of the repeated variables.
d. MSerror is an unbiased estimate of the magnitude of effect of the predictor variable in a regression analysis.
Question 3In an example in the text, an independent samples analysis of variance example from a previous chapter was converted to be used in a repeated-measures analysis of variance. Recalculating the F value with a repeated-measures analysis of variance yields an F value that is
a. less than the F value yielded by the independent measures ANOVA.
b. greater than the F value yielded by the independent measures ANOVA.
c. the same as the F value yielded by the independent measures ANOVA.
d. not predictably different from the F value yielded by the independent measures ANOVA.
Question 4In the printout of results for a repeated-measures analysis of variance, an F score for mean or constant sometimes appears. Why is this statistic often not interesting even if it is significant?
a. It shows differences between time sessions which are not important.
b. It is a randomly generated number.
c. It shows that the population mean is or is not equal to zero which is often of no interest.
d. It is redundant information given the F score for the time variable.
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