Ap Statistics Semester Exam Review Worksheets With Answer Key Page 9
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939. There is enough evidence, gathered through many experiments, to conclude that the relationship between taking Probanol
and the reduction of migraine is not happening by random coincidence. Thus, it can be concluded that Probanol causes
migraine reduction.
40. He needed a placebo, to counteract the placebo effect.
41. The factor is the eye drops, while the treatments are the actual drops versus the placebo group.
42. It is blind, as the subjects do not know which group they are in, but it is not double-blind, as the eye doctor himself does
know.
43. The population is the BHS student body.
44. Stratified random sample
c
c
c
c
45.
Venn
diagram; P(A and B) = 0.23, P(A
and B) = 0.39, P(A and B
) = 0.25, P(A
and B
) = 0.13, P(A|B) = 0.371, P(B|A) = 0.479
46. They are neither disjoint nor independent.
47. 0.18
48. 0.34
49. 0.94
50. 0.113
51. 0.0324
52. 0.6724
53. No, because they don’t add up to 1. The complement of “both orange” is “not both orange.”
54. 0.226
55. Tree diagram
56. 0.039
57. 0.454
58. 0
59. 0.295
60. 0.8676
61. e (They are all equally likely!)
62. a. false
b. true
c. false
d. true
e. false
63. discrete
64. μ = 0.3; σ = 0.520
65. μ = 5.9; σ = 1.559
66. $0.08; yes, you should take his bet, because you should expect to win 8 cents every bet, in the long run
67. a. no (not independent)
b. yes (technically not, but the population is significantly large enough)
c. yes
d. no (more than two possible outcomes)
68. 0.088
69. 0.678
70. 0.0063
71. 2
72. No, because np is less than 10.
73. The population of Ohio women is so large that taking a sample of 200 out of it will not affect individual probabilities
significantly.
74. μ = 116; σ = 6.98
75. P (X > 130) = P (z > 2.01) = 1 – .9778 = .0222
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