ISM_chapter1 - Chapter 1: What is Statistics? 1.1 a....

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1 Chapter 1: What is Statistics? 1.1 a. Population : all generation X age US citizens (specifically, assign a ‘1’ to those who want to start their own business and a ‘0’ to those who do not, so that the population is the set of 1’s and 0’s). Objective : to estimate the proportion of generation X age US citizens who want to start their own business. b. Population : all healthy adults in the US. Objective : to estimate the true mean body temperature c. Population : single family dwelling units in the city. Objective : to estimate the true mean water consumption d. Population : all tires manufactured by the company for the specific year. Objective : to estimate the proportion of tires with unsafe tread. e. Population : all adult residents of the particular state. Objective : to estimate the proportion who favor a unicameral legislature. f. Population : times until recurrence for all people who have had a particular disease. Objective : to estimate the true average time until recurrence. g. Population : lifetime measurements for all resistors of this type. Objective : to estimate the true mean lifetime (in hours). 1.2 a. This histogram is above. Histogram of wind wind Density 5 1 01 52 02 53 03 5 0.00 0.05 0.10 0.15 0.20 0.25 0.30 b. Yes, it is quite windy there. c. 11/45, or approx. 24.4% d. it is not especially windy in the overall sample.
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2 Chapter 1: What is Statistics? Instructor’s Solutions Manual 1.3 The histogram is above. Histogram of U235 U235 Density 024681 0 1 2 0.00 0.05 0.10 0.15 0.20 0.25 1.4 a. The histogram is above. Histogram of stocks stocks 24681 0 1 2 0.30 b. 18/40 = 45% c. 29/40 = 72.5% 1.5 a. The categories with the largest grouping of students are 2.45 to 2.65 and 2.65 to 2.85. (both have 7 students). b. 7/30 c. 7/30 + 3/30 + 3/30 + 3/30 = 16/30 1.6 a. The modal category is 2 (quarts of milk). About 36% (9 people) of the 25 are in this category. b. .2 + .12 + .04 = .36 c. Note that 8% purchased 0 while 4% purchased 5. Thus, 1 – .08 – .04 = .88 purchased between 1 and 4 quarts.
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Chapter 1: What is Statistics? 3 Instructor’s Solutions Manual 1.7 a. There is a possibility of bimodality in the distribution.
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ISM_chapter1 - Chapter 1: What is Statistics? 1.1 a....

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