MATH 302 Final Exam 1

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MATH 302 Final Exam 1 Part 1 of 16 - 2.0/ 2.0 Points Question 1 of 23 1.0/ 1.0 Points A cA company operates four machines during three shifts each day. From production records, the data in the ta... ble below were collected. At the .05 level of significance test to determine if the number of breakdowns is independent of the shift. Machine Shift A B C D 1 41 20 12 16 2 31 11 9 14 3 15 17 16 10 A.The number of breakdowns is dependent on the shift, because the test value 11.649 is less than the critical value of 12.592. B.The claim that the number of breakdowns is independent of the shift cannot be rejected, because the test value 11.649 is less than the critical value of 12.592. C.The number of breakdowns is dependent on the shift, because the p-value is .07. D.The number of breakdowns is independent of the shift, because the test value 12.592 is greater than the critical value of 11.649. Answer Key: B Question 2 of 23 1.0/ 1.0 Points The chi-square goodness-of-fit test can be used to test for: A.difference between population means B.normality C.significance of sample statistics D.difference between population variances Answer Key: B Part 2 of 16 - 3.0/ 3.0 Points Question 3 of 23 1.0/ 1.0 Points In a simple linear regression analysis, the following sum of squares are produced: = 500 = 100 = 400 The proportion of the variation in Y that is explained by the variation in X is: A.20% B.80% C.25% D.50% Answer Key: B Question 4 of 23 1.0/ 1.0 Points ____________ is/are especially helpful in identifying outliers. A.Scatterplots B.Regression analysis C.Normal curves D.Linear regression Answer Key: A Question 5 of 23 1.0/ 1.0 Points The marketing manager of a large supermarket chain would like to use shelf space to predict the sales of pet food. For a random sample of 12 similar stores, she gathered the following information regarding the shelf space, in feet, devoted to pet food and the weekly sales in hundreds of dollars. Store 1 2 3 4 5 6 Shelf Space 5 5 5 10 10 10 Weekly Sales 1.6 2.2 1.4 1.9 2.4 2.6 Store 7 8 9 10 11 12 Shelf Space 15 15 15 20 20 20 Weekly Sales 2.3 2.7 2.8 2.6 2.9 3.1 What is the estimated regression equation? A. = 1.45 + 0.724x B. = 1.45 + 0.074x C. = 2.63 - 0.174x D. = 2.63 + 0.724x Answer Key: B Part 3 of 16 - 2.0/ 2.0 Points Question 6 of 23 1.0/ 1.0 Points Which of the following statements is true regarding the F – distribution? A.It is a distribution of negative values B.It is always skewed to the left C.It typically appears in tests of equal proportions D.none of the above Answer Key: D Question 7 of 23 1.0/ 1.0 Points Multiple myeloma or blood plasma cancer is characterized by increased blood vessel formulation in the bone marrow that is a prognostic factor in survival. One treatment approach used for multiple myeloma is stem cell transplantation with the patient’s own stem cells. The following data represent the bone marrow microvessel density for a sample of 7 patients who had a complete response to a stem cell transplant as measured by blood and urine tests. Two measurements were taken: the first immediately prior to the stem cell transplant, and the second at the time of the complete response. Patient 1 2 3 4 5 6 7 Before 158 189 202 353 416 426 441 After 284 214 101 227 290 176 290 Perform an appropriate test of hypothesis to determine if there is evidence, at the .05 level of significance, to support the claim that the mean bone marrow microvessel density is higher before the stem cell transplant than after the stem cell transplant? What is the value of the sample test statistic? A.t = 1.8424 B.t = 2.7234 C.z = 1.8424 D.p = 2.7234 Answer Key: A .......continued [Show More]

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