stat203_practice_midterm1B.pdf - STAT 203 Practice Midterm...

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STAT 203 Practice Midterm Exam #1B (Total mark: 30) 1. Circle the most appropriate answer: [1 mark each] (a) A machine for manufacturing tennis balls produces balls with weights that follow the Normal model with mean 57 grams. If roughly 68% of the weights fall between 56.5 grams and 57.5 grams, then the IQR of the weights A. is equal to 1 gram. B. is less than 1 gram. C. is greater than 1 gram. D. cannot be determined with the information given. (b) Two sets of quantitative data have the same standard deviation. Then they must have the same A. range and IQR. B. variance and IQR. C. range. D. variance. (c) A global study involving many countries revealed that countries with high divorce rates tend to have high percentages of teenagers who use illegal drugs, and coun- tries with low divorce rates tend to have low percentages of teenagers who use illegal drugs. Based on the result of this study, which of the following conclusions is/are incorrect ? A. The divorce rate and the percentage of teenagers using illegal drugs are pos- itively associated. B. The divorce rate and the percentage of teenagers using illegal drugs have a strong linear relationship. C. Parental divorce causes teen drug use. D. Both (B) and (C).
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