Question: [24 points] You want to find out whether children’ performance on the Spoonerisms measure varies as a function of reading age, digit span and orthographic skills.

a. You have collected multiple measures of Spoonerisms and orthographic skills and want to know whether these measures of the same construct are being answered in the same way. State a test that can be performed to answer this question and perform this analysis [4 pts]

b. Having performed the above tests, evaluate whether or not you are justified in combining the items into average measures of Spoonerisms and orthographic skills. [2pts]

c. Compute these average variables. [2 pts]

d. Before regressing Spoonerisms on orthographic skills, reading age and digit span, you want to be sure that the independent variables are a) significantly correlated with the dependent variable and b) the independent variables are not too highly correlated with each other. Identify and explain what problem occurs if IVs are too highly correlated. [4 pts]

e. Correlate Spoonerisms, orthographic skills, reading age and digit span. Report the results and comment on the correlations found, in particular stating whether you think it is acceptable to include all of the variables in a single regression. [6 pts]

f. Regress Spoonerisms on orthographic skills, reading age and digit span using standard regression. Report the results and state which variable(s) significantly predict Spoonerisms and which variable is the best predictor. [6 pts]