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# ie300%20final%20review%20%28answers%29 - IE300 FINAL REVIEW...

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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 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

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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 5) Which of the following(s) is true? 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.
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