f98Key1c - Answer Key for Exam 1 ( Version C) 1. The...

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Answer Key for Exam 1 ( Version C) 1. The hypothesized mean time (= 7.7) is included in the confidence interval ( 7.5 to 9.1 ). The decision is to fail to reject Ho and conclude there is insufficient evidence the average age of a car is not equal to 7.7 years. NOTE : 95% C.I. is related to a two-tailed test at the 5% significance level. Ans. E 2. A Type I error occurs if you reject Ho when in fact it is true (see page 273). In this case, Ho states “the average age of a car is equal to 7.7 years.” So rejecting Ho is concluding the mean is not equal to 7.7. Ans. C 3. The following statements are correct answers. A. α + β always < 1. B. When the null hypothesis is not true . C. The smaller the specified value of alpha is, the smaller the rejection region. D. The p-value of a hypothesis test is the observed level of significance and so it is related to alpha . However, the p-value bears no relation to beta. Ans. E 4. From the given Excel output, the absolute value of T* (=t stat.) is -2.0288 = 2.0288 Ans. B 5. From the given Excel output, p-value ( =.0248) < α (=.05). The decision is to reject Ho.
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This note was uploaded on 03/09/2011 for the course DSCI 3710 taught by Professor Dr.jay during the Spring '08 term at North Texas.

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f98Key1c - Answer Key for Exam 1 ( Version C) 1. The...

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