Chapter_11_and_12_MCs - CHAPTER 11 AND 12 MULTIPLE CHOICE...

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CHAPTER 11 AND 12 MULTIPLE CHOICE REVIEW 1. The weights of 9 men have mean x = 175 pounds and standard deviation s = 15 pounds. What is the standard error of the mean? (a) 58.3 (b) 19.4 (c) 5 (d) 1.7 (e) None of the above. The answer is . 2. Popular wisdom is that eating presweetened cereal tends to increase the number of dental caries (cavities) in children. A sample of children was (with parental consent) entered into a study and followed for several years. Each child was classified as a sweetened-cereal lover or a nonsweetened-cereal lover. At the end of the study, the amount of tooth damage was measured. Here is the summary data: Group n mean std. dev Sugar Bombed 10 6.41 5.0 No sugar 15 5.20 15.0 An approximate 95% confidence interval for the difference in the mean tooth damage is: (a) ( 29 15 15 10 5 26 . 2 20 . 5 41 . 6 + ± - (b) ( 29 15 225 10 25 26 . 2 20 . 5 41 . 6 + ± - (c) ( 29 15 225 10 25 96 . 1 20 . 5 41 . 6 + ± - (d) ( 29 225 225 100 25 26 . 2 20 . 5 41 . 6 + ± - (e) ( 29 225 225 100 25 96 . 1 20 . 5 41 . 6 + ± - 3. Suppose we have two SRSs from two distinct populations and the samples are independent. We measure the same variable for both samples. Suppose both populations of the values of these variables are normally distributed but the means and standard deviations are unknown. For purposes of comparing the two means, we use (a) Two-sample t procedures (b) Matched pairs t procedures (c) z procedures (d) The least-squares regression line (e) None of the above. The answer is .
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4. Bags of a certain brand of tortilla chips claim to have a net weight of 14 ounces. Net weights actually vary slightly from bag to bag and are normally distributed with mean μ . A representative of a consumer advocate group wishes to see if there is any evidence that the mean net weight is less than advertised and so intends to test the hypotheses H 0 : = 14, H a : < 14. To do this, he selects sixteen bags of this brand at random and determines the net weight of each.
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This note was uploaded on 05/01/2011 for the course AP CLASSES 101 taught by Professor Mr.smith during the Spring '11 term at Korea Advanced Institute of Science and Technology.

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Chapter_11_and_12_MCs - CHAPTER 11 AND 12 MULTIPLE CHOICE...

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