3710FinalvA Fa09 Key

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

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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
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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