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M147finalas04

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Unformatted text preview: Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Total 20 Pts 20 Pts 12 Pts 12 Pts 12 Pts 24 Pts 24 Pts 30 Pts 18 Pts 172 Pts MATH 147 FINAL EXAM Spring 2004 May 13, 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 - 10 circle T for true and F for false. (2 points each) 1. T F In a long series of measurements, bias can easily be detected. 2. T F In the U.S. in 1990, there were 2.1 million deaths from all causes, compared to 1.7 million in 1960 - nearly a 25% increase. The data show that the public’s health got worse over the period 1960-1990. 3. T F A deck of cards is shuffled. The chance that the top card is the jack of clubs or the bottom card is the jack of diamonds is 2/52. 4. 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.” 5. T F If a data set has a positive correlation coefficient, then the regression line will have a positive slope. 6. T F In an observational study, the effects of treatment may be confounded with the effects of factors that got the subjects into the treatment or control group in the first place. 7. T F If a difference is highly significant , there is less than a 1% chance for the null hypothesis to be true. 8. T F When sampling from a population, the method of choosing a sample does not matter if the sample size is large. 9. T F A correlation coefficient of- 1 shows a weak correlation. 10. T F If the chance of A is .6 and the chance of B is also .6, then A and B are mutually exclusive. 1 Part II Fill in the blank For questions 11 - 16 complete the sentence by filling in the blank. (2 points for each blank) 11. The following list of numbers: 1, 5, 13, 4, 9 is converted to standard units. What is the resulting standard deviation (SD) of the converted list? . 12. Among entering students at a certain college, the men averaged 550 on the Math SAT while the women averaged 650. There were 400 men and 600 women in the class. The average Math SAT score for the entire class was . 13. Suppose that men always married women who were exactly 8% shorter. The correlation between their heights would be . 14. A box contains four tickets with a 0 and five tickets with a 1. Ninety draws are made at random with replacement. There are 37 1’s among the draws. The chance error is and the SE is . 15. The table value for a chi-square test of independence based on a 2 by 3 table with significance level .01 is ....
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