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stat test 3 spring 04

stat test 3 spring 04 - Page 1 18 Pts Page 2 10 Pts Page 3...

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Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Total 18 Pts 10 Pts 12 Pts 12 Pts 21 Pts 16 Pts 12 Pts 101 Pts MATH 147 TEST THREE Spring 2004 April 16, 2004 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 Quota sampling is a biased sampling method. 3. T F Large samples offer no protection against bias. 4. T F When tossing a fair coin 100 times, the SE for the number of heads is 5. 5. T F If a fair coin is flipped 5 times and shows a ”head” each time, the law of averages states that the 6th flip is more likely to be a ”tail.” Part II Fill in the blank For questions 6 - 10 complete the sentence by filling in the blank. (2 points for each blank) 6. A box contains three tickets with a 0 and five tickets with a 1. Eighty draws are made at random with replacement. There are 47 1’s among the draws. The chance error is and the SE is . 7. A sample of size 40 is drawn from a population of size 100. The correction factor needed is (give answer to 2 decimal places). 8. 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 . 1
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9. A sum is likely to be around its expected value, but likely to be off by a chance error similar in size to the . 10. Shown below are the probability histograms for the sum of 100, 400, 900 draws from the box 99 0 ’s 1 . Which histogram corresponds to 100 draws? . Part III Multiple Choice For questions 11 - 20 circle the answer which best completes the sentence or best answers the question. (3 points each)
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