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UNT DSCI 3710 - DSCI 3710 Exam 2A Su 2010Key_CrctdQ10-14Outpt

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A. Z > 1.282B. Z < 1.645C. Z < -1.645 and Z > 1.645D. Z < -1.96 and Z > 1.96*E. Z < -2.33A. There is insufficient information to decide whether the drug is effective.B. Fail to reject the null hypothesis, conclude the drug is effective.C. Fail to reject the null hypothesis, conclude there is insufficient evidence for drug effectiveness.D. Reject the null hypothesis, conclude the drug is not effective.E. Reject the null hypothesis, conclude the drug is effective.*A. Conclude the drug is effective because the p-value of the test is larger than 5%.B. Conclude the drug is effective because the p-value of the test is smaller than 5%.C. Conclude the drug is effective because the p-value of the test is smaller than the critical (table) value.D. Conclude the drug is not effective because the p-value of the test is larger than 5%.*E. Conclude the drug is not effective because the p-value of the test is smaller than 5%.A study is being made of the relationship between seniority, i.e., years of service with the company, and the number of workdays absent per year. The following table shows the relevant data for seven randomly selected employees.A. 5.38B. 6.35*C. 1267615D. 199523E. 98.21COURSE: DSCI 3710 Print Name: Exam 2 – version A Signature: Summer 2010 Student ID#: INSTRUCTIONS: • Please print your name and student ID number on this exam. Also, put your signature on this exam. • On your scantron PRINT your name and exam version. To better protect your privacy also print your name on the backside of your scantron. • You have 120 minutes to complete this exam. The exam is open book, open notes, and open mind. You may use any type of hand calculator but please show all your work on the exam and mark all answers on the scantron. Usage of cell phones, digital cameras, PDAs, and other communication devices is strictly prohibited. • Many of the questions follow the format of those in Hawkes Learning Systems Business Statistics. The remaining questions are either based on the Excel assignments or use an HLSBS-like approach with problems nearly identical to those assigned in the textbook. • Please DO NOT pull this exam apart. When you have completed the exam, please turn in your scantron and exam booklet to your instructor, at the front desk. • No cheating. • Good luck and we wish you well on the exam. Note: Whenever question(s) are connected you may be asked to assume a result (given a value) as an answer for the previous question but this result (value) may or may not be correct. The procedure is set in place to prevent you from losing points on a subsequent question because you made a mistake on some previous question/s.Use the information given below to answer the next 6 questions. A quality manager wishes to determine if there is a difference in the proportion of nonconforming bottle-top seals produces by two different assembly lines. Of a random sample of 200 bottle-top seals from each line, Line 1 produced 10 nonconforming items and Line 2 produced 14 nonconforming items. Is there a significant difference in the proportion of nonconforming seals produced by the two assembly lines? Use a 0.05 level of significance. 1. What are the null hypothesis and alternative hypothesis for this test? A. Ho: p1 = p2 Ha: p1 p2 * B. Ho: 1  2 Ha: 1 < 2 C. Ho: p1 p2 Ha: p1 = p2 D. Ho: p1 > p2 Ha: p1 < p2 E. Ho: 1 = 2 Ha: 1 2 2. Where is the Reject Ho region for testing the success of the program? A. Z > 1.282 B. Z < 1.645 C. Z < -1.645 and Z > 1.645 D. Z < -1.96 and Z > 1.96* E. Z < -2.33 3. Assuming the p value (observed level significance) is 0.03, what are the decision and conclusion of the test at the 5% level of significance? A. Fail to reject the null hypothesis, conclude there is sufficient evidence of proportion difference between two lines. B. Reject the null hypothesis, conclude there is evidence of proportion difference between two lines.* C. Fail to reject the null hypothesis, conclude there is insufficient evidence of proportion difference between two lines. D. Reject the null hypothesis, conclude there is no evidence of proportion of proportion of the first line being greater than the second. E. Reject the null hypothesis, conclude there is insufficient evidence of proportion difference between two lines. 4. Assuming the calculated value of the test statistic is 1.76, what are the decision and conclusion of the test at the significance level of 0.10? A. Fail to reject the null hypothesis, conclude there is sufficient evidence of proportion difference between two lines. B. Reject the null hypothesis, conclude there is evidence of proportion difference between two lines.* C. Fail to reject the null hypothesis, conclude there is insufficient evidence of proportion difference between two lines. D. Reject the null hypothesis, conclude there is no evidence of proportion of proportion of the first line being greater than the second. E. Reject the null hypothesis, conclude there is insufficient evidence of proportion difference between two lines.5. Assuming the 90% confidence interval for p1 - p2 is [-0.09 to +0.03], what are the decision and conclusion of the test at the significance level of 0.10? A. Fail to reject the null hypothesis, conclude there is sufficient evidence of proportion difference between two lines. B. Reject the null hypothesis, conclude there is evidence of proportion difference between two lines. C. Fail to reject the null hypothesis, conclude there is insufficient evidence of proportion difference between two lines.* D. Reject the null hypothesis, conclude there is no evidence of proportion of proportion of the first line being greater than the second. E. Reject the null hypothesis, conclude there is insufficient evidence of proportion difference between two lines. 6. Suppose the value of the calculated test statistic is 3.86. Which one of the following would best describe the p-value of the test? A. p > .1 B. .05 < p < .10 C. .025 < p < .05 D. .01 < p < .025 E. p < 0.01* . Use the information given below to answer the next 3 questions. To study the effect of an experimental drug, the dissolved protein levels for ten (10) subjects before and after administration of the drug were obtained Assuming that the difference


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UNT DSCI 3710 - DSCI 3710 Exam 2A Su 2010Key_CrctdQ10-14Outpt

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