Question: (a) What are the ordinary (i.e., arithmetic) mean and harmonic means of 12 and 18?

The arithmetic mean is __________ and the harmonic mean is ___________

(b) If you are comparing 12 schizophrenics to 18 manic depressives on some physiological measure for which d is expected to be about 0.7, what would be the power of a \(t\) test between these two groups, using \(\alpha=0.02\), two-tailed? The power for the test would be approximately

(c) Assume that for the experiment describe above in part

(b), power \(=0.7\) is considered the lowest acceptable level. How large would d have to be to reach this level of power? The value of d has to be at least

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