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Problem Set 3

# Problem Set 3 - 4 An independent-measures research study...

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1 Problem Set 3: Chapters 9-12 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? ____________________________________ 2. For a sample of n = 30, what t value determines the lower-tail critical region for α = .01? ____________________________________ 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? ________________

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Unformatted text preview: 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 __________. 2 5. An independent-measures experiment uses one sample with n = 110 and a second sample with n = 220 to compare two experimental treatments. The t statistic from this experiment will have degrees of freedom equal to __________. 6. What is the value of M D for the following set of difference scores? Scores: 40, –70, 70, –30, –30 ____________________________________ 7. What is the value of the estimated standard error for the following set of D-scores? Scores: 50, 90, 50, 50 ____________________________________ 8. For a single sample of n = 20, what values of t would be used to construct an 80% confidence interval? ____________________________________...
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Problem Set 3 - 4 An independent-measures research study...

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