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Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Total 20 Pts 12 Pts 12 Pts 15 Pts 22 Pts 19 Pts 100 Pts MATH 147 TEST THREE FALL 2003 November 14, 2003 Name: Section: DIRECTIONS: Show all work. Solutions with no work will receive NO credit. Neatness counts. All necessary tables are provided at the end of the test. Carry out all your calculations to at least two digits to the right of the decimal point. Part I True/False For questions 1 - 5 circle T for true and F for false. (2 points each) 1. T F In a sample survey, increasing the sample size can overcome selection bias. 2. T F Simple random sampling means drawing at random without replacement. 3. T F A parameter is a numerical fact about a population. 4. T F A statistic can be computed from a sample, and used to estimate a parameter. 5. T F If a fair coin is flipped 5 times and shows a ”heads” each time, the law of averages states that the 6th flip is more likely to be a ”tails.” Part II Fill in the blank For questions 6 - 8 complete the sentence by filling in the blank. (2 points for each blank) 6. A fair die will be rolled some number of times, and you win $1 if it shows an ace more that 20% of the time. Which is better: 60 rolls or 600 rolls? (circle one.) 7. The binomial formula is to be used to find the chance that exactly 3 heads are obtained in 10 tosses of a fair coin. The correct value of k to use in this formula is . 8. A university has 20,000 students, of whom 12,000 are undergraduates. The housing office takes a simple random sample of 400 students; 232 out of the 400 are undergraduates. For the number of undergraduates in the sample, the observed value is , but the expected value is and the chance error is . 1
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Part III Multiple Choice For questions 9 - 17 circle the answer which best completes the sentence or best answers the question. (3 points each)
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