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Answers Ch. 1-6Chapter 1 Quiz Answers:
1a. qualitative, 1b. quantitative discrete, 1c. quantitative continuous
2b. 20% 2c. 95%
3. Simple Random
4a. The patients of the cardiologist who have had heart attacks 4b. Average recovery time for the patients in the population 4c. Let X = the recovery time of one patient in the population
5. Not all people who receive the survey will reply; Some people might anser the survey erroneously on purpose
Chapter 2 Quiz Answers:
1a. freq = 19, rel. freq = .2444, cum. rel. freq. = .1444
1b. 4.3778
1c. 1.8334
1d. 4.5
1e. 7
1f. 3
1g. 40%
1h. 4.3777+3(1.8334)=9.8779
1i. Important Points: min=1, Q1=3, M=4, Q3=7, max=7
Chapter 3 Quiz Answers (ANSWERS TO THE FIRST VERSION):
1a. 58/300 1b. 18/300 1c. 211/300 1d. 18/74 1e. NO. P(underweight AND high blood pressure) = 18/300 1f. NO. P(underweight) = 74/300; P(underweight|high blood pressure) = 18/92; 74/300 is not equal to 18/92.
2b. 6/42 2c. 30/42 2d. 6/18
Chapter 4 Quiz Answers:
1a. The number of individuals who suffer from an allergic reaction to the medication
1b. X ~ B(1000, .003) binomial with n = 1000 and p = .003
1c. mean = np = (1000)(.003)= 3
1d. P(X = 8) = binomialpdf(1000, .003, 8) = 0.0080
1e. P(X > 7) = 1 - binomialcdf(1000, .003, 7) = 0.0118
1f. 1.7295
1g. P(X < 5) = P(X <= 4) = binomialcdf(1000, .003, 4) = 0.8155
2a. X = number of people entering the store in one hour
2b. lambda is the same as the mean: 120 people enter the store, on average, in one hour
2c. P(X = 100) = Poissonpdf(120, 100) = 0.0068
2d. P(X = 0) = Poissonpdf(120, 0) = 0 so it is not likely.
3a. P(X < 2) = 0.65
3b. EXPECTED VALUE = 1
3c. long term average
Chapter 5 Quiz Answers (1st quiz)
1a. X = the time it takes (in minutes) for Susan Dean's students to complete a statitistics test
1b. X ~ U(15, 52)
1c. a = 15, b = 52, mean = (a+b)/2 = (15+52)/2 = 33.5 minutes
1d. stdev = sqroot((b-a)^2/12) = sqroot((52-15)^2/12) = 10.6810 minutes
1e. For the Uniform, median = mean = 33.5 minutes
1f. "At least" means greater than or equal to:
P(X>=45) = (52-45)(1/37) = 7/37
1g. Let k = the 85th %ile; .85 = (k-15)(1/37); k = 46.4500 minutes
Chapter 6 Quiz Answers
1F, 2T, 3T, 4F, 5F, 6T, 7T, 8B, 9B, 10C
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