3710FinalvA Fa09 Key

3710FinalvA Fa09 Key - COURSE DSCI 3710 Final Exam Version...

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COURSE: DSCI 3710 Print Name: Final Exam: Version A Signature: SEMESTER: Fall 2009 Student ID #: Note: Whenever question(s) are connected you may be asked to assume a result (given a value) from the previous question but this result may or may not be correct. This is to prevent you from losing points on a second question because you made a mistake on a previous question. 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, your version, and your section number. To better protect your privacy also print your name on the backside of your scantron. You have 105 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. Many of the questions follow the format of those in Hawkes Learning Systems Business Statistics (HLS). The remaining questions are either based on the Excel assignment or use an HLSBS -like approach with problems nearly identical to those assigned in the textbook. When you have completed the exam, please insert your scantron into the exam booklet and turn them in to your instructor. No cheating. Good luck and we wish you well on the exam. 1
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1 Use the following information to answer the next six questions @pizza express boasts of an average delivery time of less than15 minutes on the orders placed from within a three mile distance from the facility. An investor doubts the claim and wants to see if the data refutes @pizza’s claim and shows they take more than 15 minutes. The investor has independent observers obtain a random sample of orders and conduct the appropriate t-test using the KPK macro at 10% significance level. The results are given below: Dat a t Test for Population Mean 13 15 Number of Observations 14 14 Sample Standard Deviation 2.218801 17 Sample Mean 16.000000 19 Ho: xxxx Ha: xxxx 13 T* 1.686342 15 P[ T T*] 0.057783 14 T Critical, α = 0.1 XXXX 20 90% CI for Pop. Mean 14.949837 t o 17.050163 . . . 17 15 1. What is the null and alternative hypothesis for this test? A. Ho: μ < 15 Ha: μ > 15* l B. Ho: μ 15 Ha: μ < 15 C. Ho: μ < 16 Ha: μ ≥16 D. Ho: μ =15 Ha: μ 15 E. Ho: μ ≥ 16 Ha: μ < 16 2. The test is based on the assumption that: A. The sample times are large B. The sample mean is normally distributed C. The true mean is 15.4 minutes D. The sample is normally distributed 2
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E. The delivery times are normally distributed *. 3. What is the best range to describe the p value (observed level of significance) of the test statistic? A. p > 0.10 B. 0.05 < p < .10* C. 0.025 < p < .05 D. .01 < p < .025 E. p < .01 4. Suppose the calculated test statistic is 4.50 . What would be the p-value? A. p > 0.10
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This note was uploaded on 04/10/2011 for the course DSCI 3710 taught by Professor Dr.jay during the Spring '08 term at North Texas.

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3710FinalvA Fa09 Key - COURSE DSCI 3710 Final Exam Version...

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