Scores on a digit span task were obtained from two groups of 20 participants (40 in total) whose members had been matched for IQ. Scores for one group were obtained following a six-week course on Cognitive Psychology and scores for the other group were obtained following a six-week course on Clinical Psychology. The mean digit spans for the two groups were mCognitive order to compute the 95% Cl around the difference between these two means. = 9.2 and mClinical = 6.8. What additional information would you need in the variances for the two groups of scores the standard deviation of the difference scores ta/2 O O O O

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