Introductory Statistics
1st Edition
ISBN: 9781938168208
Author: Barbara Illowsky, Susan Dean
Publisher: OpenStax College
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Textbook Question
Chapter 7, Problem 2P
Use the following information to answer the next six exercises: Yoonle Is a personnel manager in a large corporation. Each month she must review 16 of the employees. From past experience, she has found that the reviews take her approximately four hours each to do with a population standard deviation of 1.2 hours. Let X be the random variable representing the time it takes her to complete one review. Assume X is
2. Complete the distributions.
a.X~____(______,_____)
b. X~____(______,_____)
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14
A survey is conducted to determine whether
would prefer to work at home, if given the
20 office employees of a certain company
chance. The overall results are shown in the
first bar graph, and the results broken down
by gender are presented in the second.
a. Interpret the results of each graph.
b. Discuss the added value in including gen-
der in the second bar graph. (The second
bar graph in this problem is called a side
by side bar graph and is often used to
show results broken down by two or more
variables.)
c. Compare the side by side bar graph with
the two pie charts that you made for
Question 6. Which of the two methods is
best for comparing two groups, in your
opinion?
A
Would you prefer to work at home? (n=20)
60
50
40
Percent
20
30
20
30
10
0
No
Yes
Prefer to work at home? (10 males, 10 females)
80
Percent
60
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40
40
20-
No
Yes
No
Yes
Female
Male
Frequency
12
Suppose that a random sample of 270 gradu-
ating seniors are asked what their immediate
priorities are, including whether buying a
house is a priority. The results are shown in
the following bar graph.
a. The bar graph is misleading; explain why.
b. Make a new bar graph that more fairly
presents the results.
Is Buying a House a Priority?
300
250
200
150
100
50
0
Yes
No
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11
A polling organization wants to find out
what voters think of Issue X. It chooses a
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for their opinions of Issue X: yes, no, or
no opinion. I organize the results in the
following bar graph.
a. Make a frequency table of these results
(including the total number).
brocb. Evaluate the bar graph as to whether it
biz s b fairly represents the results.
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STORE TO OW! vd wob spind
550
540
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480
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Chapter 7 Solutions
Introductory Statistics
Ch. 7 - An unknown distribution has a mean of 45 and a...Ch. 7 - The length of time taken on the SAT for a group of...Ch. 7 - In an article on Flurry Blog. a gaming marketing...Ch. 7 - Cans of a cola beverage claim to contain 16...Ch. 7 - An unknown distribution has a mean of 45 and a...Ch. 7 - In a recent study reported Oct.29, 2012 on the...Ch. 7 - The mean number of minutes for app engagement by a...Ch. 7 - Use the information In Example 7.8, but use a...Ch. 7 - Use the information in Example 7.9, but change the...Ch. 7 - Based on data from the National Health Survey,...
Ch. 7 - According to Boeing data, the 757 airliner carries...Ch. 7 - In a city, 46 percent of the population favor the...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - True or False: only the sums of normal...Ch. 7 - In order for the sums of a distribution to...Ch. 7 - What three things must you know about a...Ch. 7 - An unknown distribution has a mean of 25 and a...Ch. 7 - An unknown distribution has a mean of 19 and a...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use (he following information to answer the next...Ch. 7 - Use (he following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Previously; De Anza statistics students estimated...Ch. 7 - Suppose that the distance of fly balls hit to the...Ch. 7 - According to the Internal Revenue Service, the...Ch. 7 - Suppose that a category of world-class runners are...Ch. 7 - The length of songs In a collectors [runes album...Ch. 7 - In 1940 the average size of a U.S. farm was 174...Ch. 7 - Determine which of the following are true and...Ch. 7 - The percent of fat calories that a pet-son m...Ch. 7 - The distribution of income in son Third World...Ch. 7 - Which of the following is NOT TRUE about the...Ch. 7 - The cost of unleaded gasoline in the Bay Area once...Ch. 7 - Which of the following is NOT TRUE about the...Ch. 7 - Suppose that the duration of a particular type of...Ch. 7 - Suppose that the weight of open boxes of cereal in...Ch. 7 - Salaries for teachers in a particular elementary...Ch. 7 - The attention span of a two-year-old is...Ch. 7 - The closing stock prices of 35 U.S. semiconductor...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following (0 answer the next two...Ch. 7 - Use the following (0 answer the next two...Ch. 7 - Suppose In a local Kindergarten through 12th grade...Ch. 7 - Four friends, Janice. Barbara, Kathy and Roberta,...Ch. 7 - XN (60, 9). Suppose that you form random samples...Ch. 7 - Suppose that the length of research papers is...Ch. 7 - Salaries for teachers In a particular elementary...Ch. 7 - The average length of a maternity stay In a U.S....Ch. 7 - For each problem. wherever possible, provide...Ch. 7 - Men have an average weight of 172 pounds with a...Ch. 7 - M&M candies large candy bags have a claimed net...Ch. 7 - The Screw Right Company claims their 34 inch...Ch. 7 - Your company has a contract to perform preventive...Ch. 7 - A typical adult has an average IQ score of 105...Ch. 7 - Certain coins have an average weight of 5.201...
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