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UNT DSCI 3710 - Spring08.finalA

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Please print your name, Student ID number, and seat number on this exam. Also, put your signature on this exam.Please PRINT your name and your Student ID number, and the above Exam Version on your scantron. To better protect your privacy also print your name on the back side of your scantron.The exam has 30 questions, and you have 100 minutes to complete it. The exam is open book, open notes, and open mind. You may use any type of calculator, but please show all your work on this exam and properly mark all answers on the scantron.Many of the questions follow the format of those in HLS modules. Others are either based on the Excel assignments done for the course, or use an HLS -like approach with problems similar to those assigned as homework from the text.Please DO NOT DETACH this exam. When you have completed the exam, please insert completed scantron into the exam booklet and turn them (both) in to your instructor, at the front desk.No cheating.Good luck and we wish you well on the exam.A. p > .1B. .05 < p < .10C. .005 < p < .01*D. .01 < p < .025E. 0.000001313. What’s the estimate of the variance of the error?A. 20.77 B. 3.45* C. 0.005 D. 5.11 E. 155.4419. What is the correlation between these two variables?A. There is sufficient evidence that the group of variables does not contain information about bonus.B. There is insufficient evidence that the slope of the regression line is positive.C. There is sufficient evidence that the group of variables contains information about sales.*D. There is sufficient evidence to indicate that ADV is negatively correlated with sales.E. There is insufficient evidence to conclude that the group of variables contains information about sales.- Please print your name, Student ID number, and seat number on this exam. Also, put your signature on this exam.- Please PRINT your name and your Student ID number, and the above Exam Version on your scantron. To better protect your privacy also print your name on the back side of your scantron.- The exam has 30 questions, and you have 100 minutes to complete it. The exam is open book, open notes, and open mind. You may use any type of calculator, but please show all your work on this exam and properly mark all answers on the scantron.- Many of the questions follow the format of those in HLS modules. Others are either based on the Excel assignments done for the course, or use an HLS -like approach with problems similar to those assigned as homework from the text.- Please DO NOT DETACH this exam. When you have completed the exam, pleaseinsert completed scantron into the exam booklet and turn them (both) in to your instructor, at the front desk.- No cheating.- Good luck and we wish you well on the exam.COURSE: DSCI 3710 (Print) Name:Final Exam for Spring 2008 (Ver. A) SID #:Signature:Note: Whenever question(s) are connected you may be asked to assume a result (given a value) as answer to some previous question/s; but this result may or may not be correct. The process is to prevent you from losing points on subsequent question/s just in case you made a mistake on some previous question/s (to avoid sequential error).Instructions:Use the information given below to answer the four (4) questions that follow.An engineer has designed a valve that will regulate water pressure on an automobile engine. The engineer designed the valve such that it would produce a mean pressure of 7.9 1bs/square inch. The valve was tested on 300 engines and the mean pressure was 8 1bs/square inch. Assume the variance is known to be 0.81 1bs/square inch. Is there evidence at the 0.05 level that the valve does not perform to the specifications? 1. The null and alternative hypothesis test pair is: A. H0: μ = 7.9 and Ha: μ ≠7.9 *B. H0: μ > 7.9 and Ha: μ <7.9C. H0: μ < 7.9 and Ha: μ >7.9D. H0: μ < 7.9 and Ha: μ > 7.9E. H0: μ > 7.9 and Ha: μ < 7.92. What is the calculated value of the Z test statistic?A. 2.099B. 1.383C. 0.033D. 2.56E. 1.92 *3. At the 0.05 level of significance, where is the Reject Ho region?A. To the left of Z = -1.282 and to the right of Z = 1.282B. To the left of Z = -1.645 and to the right of Z = 1.645C. To the left of Z = -1.96 and to the right of Z = 1.96*D. To the left of t = -1.328 and to the right of t = 1.328E. To the right of Z = 1.6454. Assuming the calculated value of the test statistic is 1.00, what are the decision and conclusionof the test at the significance level of 0.05?A. Fail to reject the null hypothesis, conclude there is insufficient evidence that the valve does not perform to the specifications.*B. Reject the null hypothesis; conclude there is overwhelming evidence that the valve does not perform to the specifications.C. Fail to reject the null hypothesis, conclude there is insufficient evidence that the valve would produce a pressure of 8 1bs/square inch.D. Reject the null hypothesis; conclude there is insufficient evidence that the valve would pro-duce a pressure of 7.9 1bs/square inch.E. Inconclusive.Use the information given below to answer the three (3) questions that follow. A quality engineer wishes to determine if there is a difference in the number of nonconforming bottle-top seals produced by two different assembly-line processes. A bottle-top seal is nonconforming if the seal is not air-tight. To investigate this, the engineer samples 300 bottle-topseals from each assembly-line process. The samples reveal that one process (p1) produced 8 nonconforming items and the other (p2) produced 12 nonconforming items. Based on these data, can the engineer conclude that there is a significant difference in the proportion (p1-p2) of nonconforming bottle-top seals produced by the two assembly-line processes?5. What are the null and alternative hypotheses?A. HA: p1 = p2 H0: p1 =/ p2B. H0: p1 > p2 HA: p1 < p2C. H0: p1 = p2 HA: p1 =/ p2 *D. H0: p1 > p2 HA: p1 < p2 E. H0: p1 < p2 HA: p1 > p2 6. The mean proportion of p (in percent) is …?A. 2.74 B. 6.39C. –1.96D. –2.24E. 3.33 *7. The computed value of the Z test statistic is …?A. -0.91*B. -1.45C. 0.89D. 6.32E. -1.909Use the information given below to answer the six (6) questions that follow.A quality engineer believes that the speed level of a manufacturing process affects the number of nonconforming items produced. The three speed levels and the number of nonconforming items at each level and the ANOVA table are given below. Use a 1% significance level to assess any differences in the mean number


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UNT DSCI 3710 - Spring08.finalA

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