2009-11-11_002606_Quiz3SV

2009-11-11_002606_Quiz3SV - 1. Suppose we are testing the...

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1. Suppose we are testing the difference between two proportions at the 0.05 level of significance. If the computed z is 1.07, what is our decision? A. Reject the null hypothesis B. Do not reject the null hypothesis C. Take a larger sample D. Reserve judgment 2. The net weights (in grams) of a sample of bottles filled by a machine manufactured by Edne, and the net weights of a sample filled by a similar machine manufactured by Orno, Inc., are: Edne: 5, 8, 7, 6, 9 and 7 Orno: 8, 10, 7, 11, 9, 12, 14 and 9 Testing the claim at the 0.05 level that the mean weight of the bottles filled by the Orno machine is greater than the mean weight of the bottles filled by the Edne machine, what is the critical value? Assume equal standard deviations for both samples. A. 2.179 B. 2.145 C. 1.782 D. 1.761 3. When is it appropriate to use the paired difference t -test? A. Four samples are compared at once B. Any two samples are compared C. Two independent samples are compared D. Two dependent samples are compared 4. Administering the same test to a group of 15 students and a second group of 15 students to see which group scores higher is an example of A. a one sample test of means. B. a two sample test of means. C. a paired t -test. D. a test of proportions. 5. 20 randomly selected statistics students were given 15 multiple-choice questions and 15 open-ended questions – all on the same material. The professor was interested in determining which type of questions the students scored higher. This experiment is an example of A. a one sample test of means. B. a two sample test of means. C. a paired t -test. D. a test of proportions. USE the following situation for Questions 6 and 7: Of 250 adults who were administered the J2P2 anti-virus 187 did not show symptoms of the disease that it guarded against; of 100 children who were administered the anti-virus, 66 did not show symptoms of the disease.
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6. Using the 0.1 significance level and the alternate hypothesis π 1 not equal to π 2 , what is the null hypothesis? A. π 1 > π 2 B. π 1 < π 2 C. π 1 = π 2 D. None of these 7. What test statistic should we use? A. z -statistic B. Right one-tailed test C. Left one-tailed test D. Two-tailed test Use the following situation for Questions 8 – 15: A national manufacturer of ball bearings is experimenting with two different processes for producing precision ball bearings. It is important that the diameters be as close as possible to an industry standard. The output from each process is sampled and the average error from the industry standard is calculated. The results are presented below. 8. What is the null hypothesis? μ A μ B A. μ A = μ B B. μ A μ B C. μ A μ B D. μ A > μ B . 9. What is the alternate hypothesis?
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This note was uploaded on 12/14/2010 for the course STAT 230 taught by Professor Roy during the Fall '10 term at Maryland.

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2009-11-11_002606_Quiz3SV - 1. Suppose we are testing the...

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