ISM_chapter1

# ISM_chapter1 - Chapter 1 What is Statistics 1.1 a...

This preview shows pages 1–4. Sign up to view the full content.

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.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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.
Chapter 1: What is Statistics? 3 Instructor’s Solutions Manual 1.7 a. There is a possibility of bimodality in the distribution.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 03/18/2009 for the course STA 4321 taught by Professor Staff during the Spring '08 term at University of Florida.

### Page1 / 7

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

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online