Fa05Ex1A - COURSE: DSCI 3710 Exam 1 Version A SEMESTER:...

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COURSE: DSCI 3710 Print Name: Exam 1 Signature: Version A SID #: SEMESTER: Fall 2005 Note: Whenever question(s) are connected you may be asked to assume a result (given a value) for the previous question/s, this result may or may not be correct. The procedure is followed only to prevent you from losing points on further question/s because you made a mistake on a previous question. Instructions: n Please PRINT your name and student identification number on this exam. Also, put your signature on this exam. l Please PRINT your name, this exam-version, and your section number on the Scantron. To better protect your privacy also print your name on the backside of your scantron. l You have 75 minutes to complete this exam. The exam is open book, open notes, and open mind. You may use any type of calculator but please show all your work on the exam. and mark all answers on the scantron. l Many of the questions follow the format of those in Hawkes Learning System - Business Statistics (HLS). The remaining questions are either based on the Excel assignment or use an HLS-like approach with problems similar to those assigned in the textbook. l When you have completed the exam, please insert your scantron into the exam booklet and turn them in to your instructor. l Please DO NOT detach this exam., and keep all your help-material secure near you. No cheating. l Good luck and we wish you well on the exam.
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1 Please use the information given in the paragraph below to answer the four questions that follow. An automobile manufacturer claims their car gives at least 30.0 miles/gallon (mpg). An independent testing firm has been contracted to test the mpg of the car. They tested 15 vehicles and their analysis of the data using Excel is given below. They suspect that the cars’ mpg performance is even better than what the manufacturer claims; and the true mean mpg may be over 30. Is there sufficient evidence, at the 0.01 significance level, that the cars’ performance is better than their manufacturer’s mpg rating? t Test for Population Mean MPG Number of Observations 15 Sample Standard Deviation 3.501809 Sample Mean 31.853333 XXXX XXXX T* 2.049777 P[ T T*] 0.029802 T Critical, α = 0.01 2.624494 99% CI for Pop. Mean 29.161782 t o xxxxxxxx 1. Which of the following would be appropriate for the alternative hypothesis? A. μ = 30 B. μ > 30 C. μ < 30 D. μ > 30* E. μ ≤ 30 2. The decision rule, based on the Table value is: to reject Ho if t* A. > 2.62 * B. < 2.62 C. > the p-value D. > 2.05 E. < 2.05 3. What is the decision and conclusion of the test? A. Reject Ho, conclude there is convincing evidence that the cars do not perform better than manufacturer’s mpg rating. B. F.T.R. Ho, conclude there is insufficient evidence that the cars perform better than the
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Fa05Ex1A - COURSE: DSCI 3710 Exam 1 Version A SEMESTER:...

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