Question: Dr. Brigham decided to replicate Dr. Goddards study (see Exercise 8.92) with a larger sample. She did exactly what Dr. Goddard did, but had 1,002

Dr. Brigham decided to replicate Dr. Goddard’s study (see Exercise 8.92) with a larger sample. She did exactly what Dr. Goddard did, but had 1,002 subjects (501 in the control group and 501 in the experimental group). The means for the two groups were exactly the same, 100 and 102, and both groups again had standard deviations of 15. Dr. Brigham found sM1−M2=0.95, t = 2.11, r 2 = 0.44%, and the 95% confidence interval ranged from .14 to 3.86.

(a) Did Dr.

Brigham reject the null hypothesis?

(b) What conclusion should she reach about whether Dr. Goddard’s treatment increases IQ?

(c) How big is the size of the effect as determined by r 2?

(d) What information does the confidence interval give on how sure we are about the impact of the IQ-increasing technique?

(e) How worried are you that Dr. Brigham made a Type I error?

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