2201%20b%20Quiz%2003

# 2201%20b%20Quiz%2003 - (7 pages revised Page 1 of 2201 Quiz...

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(7 pages; revised 04/04/08) Page 1 of 2201 Quiz 03 Louisiana State University EXST 2201 Quiz 03 Spring 2008 Name: _________________________ Section: __________ Score: __________ Due: Week of April 14, 2008 (100 pts) Directions : Put your answer (letter) in the associated blank. You may use any book and talk to any person. You do not have to show your work to get credit. 1. Classify the following scenarios. A. Sample 1: The weights (lbs) of 19 newborn females. _____ (3 pts) Sample 2: The weights (lbs) of 19 newborn males. a) Paired-samples. b) Independent samples. B. Sample 1: The scores (points) of 13 students who took the ACT. _____ (3 pts) Sample 2: The scores (points) of 13 other students who took the SAT. a) Paired-samples. b) Independent samples. C. Sample 1: The pre-training weights (lbs) of 17 athletes. _____ (3 pts) Sample 2: The post-training weights (lbs) of the same 17 athletes. a) Paired-samples. b) Independent samples. 2. A weight-lifting coach claims that weight-lifters can increase their strength by taking a certain supplement. To test his theory, the coach randomly selects 9 athletes and gives them a strength test using a bench press. Thirty days later, after regular training using the supplement, they are tested again. The results are listed below. Test the claim that the supplement is effective in increasing the athlete’s strength. Use significance 0.10 and assume that the data are distributed normally. Before: 215 240 188 212 275 260 225 200 182 After: 225 245 188 210 282 275 230 195 190 Difference: -10 -5 0 2 -7 -15 -5 5 -8 n d -bar s Difference: 9 -4.78 6.24 A. What is the appropriate set of hypotheses (H0, H1)? _____ (3 pts) a) mu (d) = 0, mu (d) .ne. 0 b) mu (d) .ne. 0, mu (d) = 0 c) mu (d) = 0, mu (d) < 0 d) mu (d) = 0, mu (d) > 0 B. What is the correct value of the test statistic? _____ (3 pts) a) -2.30 b) 6.51 c) -4.44 d) -6.51

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(7 pages; revised 04/04/08) Page 2 of 2201 Quiz 03 C. What is the correct P -value for this test statistic? _____ (3 pts) a) 0.025 b) 0.050 c) 0.020 d) 0.100 D. Does the supplement significantly increase the athlete’s strength? _____ (4 pts) a) Yes. b) No. c) Sometimes. d) Depends on distribution. 3. A study was conducted to determine if the salaries of elementary school teachers from two neighboring districts were equal. A sample of 15 teachers from each district was randomly selected. Test the claim that the salaries from both districts are equal. Use significance 0.05 and assume that the data are distributed normally.
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2201%20b%20Quiz%2003 - (7 pages revised Page 1 of 2201 Quiz...

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