Statistics Midterm

Statistics Midterm - Instructor Class Meeting Time Name Red...

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Multiple-Choice questions are worth 2 points: 1. Which of the following is ALWAYS true for probabilities; 38. ) ( ) ( ) ( ) ( B A P B P A P B A P - + = 39. ) ( ) ( B A P A B P = 40. ) ( ) ( ) ( B P A P B A P = 41. Both A and C are always true. Answer 2. The midterm scores in a Stats119 class follow a normal distribution with mean 72 and standard deviation of 25. Suppose the midterm points are collected from a random sample of 25 students. Which of the following is the correct notation? 42. X ~ N(72,25) 43. X ~ AN(72,5) 44. X ~ B(25,0.72) 45. X ~ N(72,5) Answer Use the following to answer questions 3 and 4 : A study of rural literacy in boys age 10-15 in Mali found with 90% confidence that the true proportion of rural boys that are literate is between 0.51 and 0.57. 3. Which of the following are true statements about this confidence interval? 46. We don’t know exactly what proportion of rural Malinese boys, age 10-15, are literate, but the interval from 0.51 to 0.57 contains the true proportion. 47. We know that the proportion of Malinese boys, age 10-15, that are literate is between 0.51 and 0.57. 48. We are 95% confident that between 51% and 57% of rural Malinese boys, age 10-15, are literate. 49. Between 51% and 57% of rural Malinese boys, age 10-15, are literate. Answer 4. What are the point estimate of the true proportion and the margin of error? A. 0.90, 0.03 B. 0.459, 0.05 C. 0.54, 0.06 D. 0.54, 0.03 Answer
Total_____________(8) 5. In order to investigate whether women are more likely than men to prefer Democratic candidates, a political scientist selects a large sample of registered voters, both men and women. She asks every voter whether they voted for the Republican or the Democratic candidate in the last election. This is 50. an observational study 51. a matched-pairs experiment 52. a completely randomized experiment 53. a block design. Answer 6. Wildlife biologists wish to inspect deer taken by hunters to determine the incidence of Lyme disease carrying ticks in deer in the wild population. If they wish to create a 95% confidence interval with a margin of error of 3%, how many deer should they inspect? 54. 752

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Statistics Midterm - Instructor Class Meeting Time Name Red...

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