Problem Set 3_solutions

# Problem Set 3_solutions - Problem Set 3 Chapters 9-12...

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Problem Set 3: Chapters 9-12 SOLUTIONS PSY207 B : Spring 2011 Due at the beginning of class on Wednesday, 4/6 – NO EXCEPTIONS. You must hand in your work on this form. Each question is worth ½ point. Name: _________________________________ Person number: _________________________________ Note: It is possible that you may not be able to compute some answers because of insufficient information. If so, simply indicate “insufficient information” in the space provided for the answer. 1. What is the estimated standard error for a sample of n = 20 scores with s 2 = 50? ____________________________________ 58 . 1 20 50 2 = = = = n s n s s m 2. For a sample of n = 30, what t value determines the lower-tail critical region for α = .01? ____________________________________ df = 29; t = -2.462 3. A sample is selected from a population with a mean of 100 and a treatment is administered to the sample. After treatment, the sample mean is 95 with a sample variance of 145. What is Cohen’s d? ________________ 42 . 145 100 95 2 = = = = s M s M d μ μ

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4. An independent-measures research study includes the following two samples: Sample 1: n = 20, SS = 128, M = 20 Sample 2: n = 20, SS = 100, M = 10 Then the value of the pooled variance, estimated standard error, and t statistic are __________.
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