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Unformatted text preview: IE300 FINAL REVIEW QUESTIONS AND ANSWERS MULTIPLE CHOICE QUESTIONS 1) Consider the following box plot: 1 2 50 60 70 80 90 100 110 120 130 140 Smokes Pulse2 Variable Smokes N Mean Median StDev Q1 Q3 Pulse2 1 28 81.18 15.39 70.50 93.50 2 64 76.00 17.88 68.00 84.00 Based on the above Minitab output what can be claimed for sure? a) The samples obtained from Smoke Type 1 and Smoke Type 2 are normally distributed. b) Variance of the sample obtained from Smoke Type 1 is smaller than that of Smoke Type 2. c) The sample distribution of Smoke Type 2 is left skewed. d) IQR of Smoke Type 1 is narrower than IQR of Smoke Type 2. e) The median of the sample obtained from Smoke Type 1 is smaller than the median of the sample obtained from Smoke Type 2. 2) An experimental design that permits statistical conclusions about two or more factors of main interest is a a) randomized block design b) factorial design c) completely randomized design d) randomized design 3) In a laboratory experiment, data were gathered on the life span (Y in months) of 33 rats, units of whether or not agent X 1 (a proposed life extending agent) was added to the rats diet (X 1 = 0 1 if agent X 1 was not added, and X 1 = 1 if agent was added). From the results of the experiment, the following regression model was developed. Y = 38- 1.7X 1 From the regression equation, it can be said that the life expectancy of rats that were given agent X 1 is a) 1.7 months more than those who did not take agent X 1 b) 1.7 months less than those who did not take agent X 1 c) 34.3 months d) 35.1 months 4) Doubling the size of the sample will a) reduce the standard error of the mean to one-half its current value b) reduce the standard error of the mean to approximately 70% of its current value c) have no effect on the standard error of the mean d) double the standard error of the mean 5) Which of the following(s) is true? a) An estimator is unbiased if = X b) An unbiased estimator with the minimum variance among all the other unbiased estimators has the lowest MSE. c) An unbiased estimator is normally distributed. d) An estimator for a parameter is any function of the parameter. 6) When testing for a difference in two population means with unknown variances, a pooled variance must be computed when a. Using a two-tailed test. b. Variances are assumed to be unequal. c. Variances are assumed to be equal. d. The sample sizes are equal. e. Means are assumed to be equal. 7) The sample mean is an unbiased estimator for the population mean. This means: a. The sample mean always equals the population mean. b. The average sample mean, over all possible samples, equals the population mean. c. The sample mean is always very close to the population mean....
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This note was uploaded on 01/26/2012 for the course IE IE 300 taught by Professor Zafarani during the Spring '09 term at University of Illinois, Urbana Champaign.
- Spring '09