Research methods in education .A question:?

You have a study with an independent variable (experimental treatment


versus control), a moderator variable (IQ), and a dependent variable


(performance on a criterion test). The statistical test you would be likely


to employ would be :


a. t-test


b. correlation


c. analysis of variance


d. chi-square


Support your answer.

Research methods in education .A question:?
Your teacher wants you to answer analysis of variance.





A t-test compares the mean differences b/w 2 groups: are the test scores for the Tx group higher than those of the control group.


How do you get a statistical probability of the effect of IQ?





A correlation compares the relationship b/w 2 variables (code exp=1, control = 2), and correlate w/ test scores. Again, IQ is left out.





A chi-square tests the associations b/w categorical variables (e.g., sex (boy,girl) and pet type (dog, cat, lizard)





An ANOVA allows you to test the mean differences in test scores according to TX while controlling for the effect of IQ.





Of course,most of these analyses are derived from the same fundamental premises and only use different computational formulas b/c they originated bwhen the numbers were still calculated by hand.





Multiple regression is the preferred statistical technique today, and the model





Predicted score = b (overall average) + Tx type + IQ +IQxTX

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