Intro Stats
4th Edition
ISBN: 9780321826275
Author: Richard D. De Veaux
Publisher: PEARSON
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Textbook Question
Chapter 1, Problem 17E
(Exercises 19–26) For each description of data, identify Who and What were investigated and the Population of interest.
23. Honesty Coffee stations in offices often just ask users to leave money in a tray to pay for their coffee, but many people cheat. Researchers at Newcastle University alternately taped two posters over the coffee station. During one week, it was a picture of flowers; during the other, it was a pair of staring eyes. They found that the average contribution was significantly higher when the eyes poster was up than when the flowers were there. Apparently, the mere feeling of being watched—even by eyes that were not real—was enough to encourage people to behave more honestly. (Source: NY Times, Dec. 10, 2006)
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The table shows the number of accidents, fatalities, hours and miles flew for U.S. airlines.
Year
Accidents
Fatalities
Hours flown
Miles flown
2000
59
98
16.7 million
7.1 billions
2005
36
28
18.7
7.8
2010
29
0
17.2
7.3
2015
25
0
17.4
7.6
a. Compute the accident rate per million hours flown in 2000 and 2015. By this measure, has travel on U.S. airlines become safer?
b. Compute the accident rate per billion miles flown in 2000 and 2015. By this measure, has travel on U.S. airlines become safer?
Farmers know that driving heavy equipment on wet soil compresses the soil and injures future crops. Here are data on the "penetrability" of the same type of soil at two levels of compression. Penetrability is a measure of how much resistance plant roots will meet when they try to grow through the soil.
Compressed Soil:
2.85 3.082.6 2.822.95 2.782.82 2.982.76 3.002.81 2.782.78 2.963.08 2.902.94 3.182.86 3.16
Intermediate Soil:
3.13 3.543.32 3.363.1 3.183.40 3.123.38 3.863.14 2.923.18 3.463.26 3.442.96 3.623.02 4.26
Use the data, omitting the high outlier, to give a 96% confidence interval for the decrease in penetrability of compressed soil relative to intermediate soil. Compute degrees of freedom using the conservative method.Interval: To
Cellulon, a manufacturer of home insulation, wants to develop guidelines for builders and consumers on how the thickness of the insulation in the attic of a home and the outdoor temperature affect natural gas consumption. In the laboratory, it varied the insulation thickness and temperature. A few of the findings are:
Monthly Natural Gas Consumption (cubic feet), Y
Thickness of Insulation (inches), X1
Outdoor Temperature (°F), X2
30.3
6
40
26.9
12
40
22.1
8
49
How much natural gas can homeowners expect to use per month if they install 6 inches of insulation and the outdoor temperature is 40 degrees F?
Group of answer choices
36.69 cubic feet
30.30 cubic feet
30.89 cubic feet
33.69 cubic feet
Chapter 1 Solutions
Intro Stats
Ch. 1.3 - Prob. 1JCCh. 1.3 - Prob. 2JCCh. 1 - Grocery shopping Many grocery store chains offer...Ch. 1 - Online shopping Online retailers such as...Ch. 1 - Super Bowl Sports announcers love to quote...Ch. 1 - Nobel laureates The website www.nobelprize.org...Ch. 1 - Prob. 5ECh. 1 - ZIP codes The U.S. Postal Service uses five-digit...Ch. 1 - Voters A February 2010 Gallup Poll question asked,...Ch. 1 - Job hunting A June 2011 Gallup Poll asked...
Ch. 1 - Medicine A pharmaceutical company conducts an...Ch. 1 - Stress A medical researcher measures the increase...Ch. 1 - (Exercises 1926) For each description of data,...Ch. 1 - (Exercises 1926) For each description of data,...Ch. 1 - (Exercises 1926) For each description of data,...Ch. 1 - (Exercises 1926) For each description of data,...Ch. 1 - (Exercises 1926) For each description of data,...Ch. 1 - (Exercises 1926) For each description of data,...Ch. 1 - (Exercises 1926) For each description of data,...Ch. 1 - (Exercises 1926) For each description of data,...Ch. 1 - (Exercises 2740) For each description of data,...Ch. 1 - (Exercises 2740) For each description of data,...Ch. 1 - (Exercises 2740) For each description of data,...Ch. 1 - (Exercises 2740) For each description of data,...Ch. 1 - (Exercises 2740) For each description of data,...Ch. 1 - (Exercises 2740) For each description of data,...Ch. 1 - (Exercises 2740) For each description of data,...Ch. 1 - (Exercises 2740) For each description of data,...Ch. 1 - (Exercises 2740) For each description of data,...Ch. 1 - (Exercises 2740) For each description of data,...Ch. 1 - Prob. 31ECh. 1 - (Exercises 2740) For each description of data,...Ch. 1 - Prob. 33ECh. 1 - Prob. 34E
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