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Unformatted text preview: IE 121 Spring 2002 Final exam 1. (20 points) In this problem, you need to select the correct answer. 1. If the P-value for your test statistic is P = . 15, then: (a) you would not reject H for = . 05. (b) you would reject H for = . 05. (c) you would reject H for = . 10. (d) your acceptance region has a lower limit of .15. (e) none of these 2. Suppose you are going to test H : m = m , H 1 : m 6 = m using = . 05. n and 2 are given. Find all values of z = ( x- ) 2 / n for which H should be rejected. a) z <- 1 . 96 b) z <- 1 . 645 or z > 1 . 645 c)- 1 . 96 < z < 1 . 96 d) z <- 1 . 96 or z > 1 . 96 e)- 1 . 645 < z < 1 . 645 3. Which statement about the statistical process control is correct? a) A process is said to be operating in statistical control when chance causes are the only source of variation. b) A process that is operating in the presence of assignable cause is said to be in statistical control. c) The assignable causes include operator errors, defective raw materials and back- ground noise. d) All the points in a control chart should be in the control limits if there is no presence of assignable causes. 4. Suppose we are interested in the mean weight of a certain type of a candy bar. We test 15 samples. The resulting sample average is 6.03 oz and the sample standard deviation is 1.47 oz. Then the 95% confidence interval for the mean weight is: a) 6 . 03 2 . 131 . 38 b) 6 . 03 1 . 761 . 38 c) 6 . 03 2 . 145 . 38 d) 6 . 03 1 . 96 . 38 e) None of these 1 5. The Central Limit Theorem is considered powerful in statistics because: a) It works for any sample size provided the population is normal. b) It works for any population distribution as long as the sample size is large enough. c) It works for any population distribution provided the population size is known. d) It works for any sample size provided the population distribution is known. 6. Which statement about the nonparametric statistics is incorrect? a) The Wilcoxon signed-rank test applies to the case of symmetric continuous distri- butions....
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This test prep was uploaded on 02/26/2008 for the course IE 121 taught by Professor Perevalov during the Spring '08 term at Lehigh University .
- Spring '08