The Essentials of Statistics: A Tool for Social Research
4th Edition
ISBN: 9781305802698
Author: Joseph F. Healey
Publisher: Cengage Learning US
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Textbook Question
Chapter 6, Problem 6.7P
a. They reported that they had spent an average of
b. They also reported that they had visited the health clinic an average of 1.5 times a semester, with a sample standard deviation of 0.3.
c. On the average, the sample had missed 2.8 days of classes per semester because of illness, with a sample standard deviation of 1.0.
d. On the average, the sample had missed 3.5 days of classes per semester for reasons other than illness, with a sample standard deviation of 1.5.
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5.5
A glass bottle manufacturing company has recorded data on the average
number of defects per 10,000 bottles due to stones (small pieces of rock
embedded in the bottle wall) and the number of weeks since the last furnace
overhaul. The data are shown below.
Defects per 10,000
Weeks
13.0
4
16.1
5
14.5
6
17.8
7
22.0
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27.4
9
16.8
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Weeks
34.2
11
12
49.2
13
66.2
81.2
87.4
14
15
16
114.5
17
a. Fit a straight-line regression model to the data and perform the standard
tests for model adequacy.
b. Suggest an appropriate transformation to eliminate the problems encoun-
tered in part a. Fit the transformed model and check for adequacy.
One estimate of the proportion of children with autism in the United States is 1 in 100 (Source: http://www.cbsnews.com/stories/2009/10/05/health/main5363192.shtml). Suppose you are interested in the rate of autism among current school-aged children in Utah. You collect a sample of 400 children between the ages of 5 and 18 and find that three have had a previous diagnosis of an autism disorder. You plan to calculate a 95% confidence interval estimator of the proportion of school-aged children in Utah who have ever had a diagnosis of an autism disorder.
Which of the following is the most likely reason you would use a Wilson estimator to calculate the confidence interval estimator?
It is uncomfortable to define having been diagnosed with autism as a success.
It is possible that if even the actual proportion in Utah is 1%, your sample may only have very few children who have had a previous diagnosis of an autism disorder.
It is an easier way to calculate the confidence…
Problem 2-6. Need help on why its 1.22
Chapter 6 Solutions
The Essentials of Statistics: A Tool for Social Research
Ch. 6 - For each set of sample outcomes below, use Formula...Ch. 6 - For each of the following sets of sample outcomes,...Ch. 6 - For each of the following confidence levels,...Ch. 6 - You have developed a series of questions to...Ch. 6 - SOC A researcher has gathered information from a...Ch. 6 - SOC A random sample of 100 cable TV movies...Ch. 6 - SOC A random sample of 429 college students was...Ch. 6 - PA A random sample of 100 inmates at a maximum...Ch. 6 - SOC The survey mentioned in problem 6.5 found that...Ch. 6 - PA A random sample of 260 workers in a high-rise...
Ch. 6 - A random sample of 1496 respondents of a major...Ch. 6 - A random sample of 100 patients treated in a...Ch. 6 - For the following sample data, construct five...Ch. 6 - For each of the following three sample sizes,...Ch. 6 - Two individuals are running for mayor of your...Ch. 6 - SOC The World Values Survey is administered...Ch. 6 - SOC The fraternities and sororities at St. Algebra...Ch. 6 - You are the automotive specialist for the monthly...
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