PSY 207B Exercise 7 (Chapter 10&11) __ Key Chapter 10: The t Test for Two Independent Samples 12. The pooled variance is 6, the estimated standard error is 1, and t = 3.00. With df = 22, the critical boundaries are t = ±2.074. Reject H0 . 14. a. The two samples combined have a total of 32 participants. b. With df = 30 and α = .05, the critical region consists of t values beyond 2.042. The t statistic is in the critical region. Reject H0 and conclude that there is a significant difference. c. r 2 =4.35/34.35 = 0.127 or 12.7% 16. a. For the offensive linemen, the standard error is 0.97 and t = 4.54. For a one-tailed test with df = 16, the critical value is 2.583. Reject the null hypothesis. The offensive linemen are significantly above the criterion for BMI. b. For the defensive linemen, the standard error is 0.80 and t = 2.375. For a one-tailed test with df = 18 , the critical value is 2.552. Fail to reject the null hypothesis. The defensive linemen are not significantly above the criterion for BMI. c.
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