Question: 15. (a) 9.10 (b) 13.06 (c) 1.22 and 2.23, respectively (d) In both cases, the difference between means is between one-fifth and one-quarter of a

15.

(a) 9.10

(b) 13.06

(c) 1.22 and 2.23, respectively

(d) In both cases, the difference between means is between one-fifth and one-quarter of a standard deviation. According to Cohen’s classification, these are \small" effect sizes.

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