Introductory Statistics
1st Edition
ISBN: 9781938168208
Author: Barbara Illowsky, Susan Dean
Publisher: OpenStax College
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Textbook Question
Chapter 5, Problem 48P
Use the following information to answer the next ten exercises. A customer service representative must spend different amounts of time with each customer to resolve various concerns. The amount of time spent with each customer can be modeled by the following distribution: X — Exp(0.2)
What is m? What does it represent?
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1. A consumer group claims that the mean annual consumption of cheddar cheese by a person in
the United States is at most 10.3 pounds. A random sample of 100 people in the United States has
a mean annual cheddar cheese consumption of 9.9 pounds. Assume the population standard
deviation is 2.1 pounds. At a = 0.05, can you reject the claim? (Adapted from U.S. Department of
Agriculture)
State the hypotheses:
Calculate the test statistic:
Calculate the P-value:
Conclusion (reject or fail to reject Ho):
2. The CEO of a manufacturing facility claims that the mean workday of the company's assembly
line employees is less than 8.5 hours. A random sample of 25 of the company's assembly line
employees has a mean workday of 8.2 hours. Assume the population standard deviation is 0.5
hour and the population is normally distributed. At a = 0.01, test the CEO's claim.
State the hypotheses:
Calculate the test statistic:
Calculate the P-value:
Conclusion (reject or fail to reject Ho):
Statistics
21.
find the mean.
and
variance of the
following:
Ⓒ x(t) = Ut +V, and V indepriv. s.t
U.VN NL0, 63).
X(t) = t² + Ut +V, U and V incepires have N (0,8)
Ut
①xt = e UNN (0162)
~ X+ = UCOSTE, UNNL0, 62)
SU, Oct
⑤Xt=
7
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+> ½
have NL, 62).
⑥Xn = ΣY, 41, 42, 43, ... Yn vandom sample
K=1
Text
with mean zen and variance 6
A psychology researcher conducted a Chi-Square Test of Independence to examine whether there is a relationship between college students’ year in school (Freshman, Sophomore, Junior, Senior) and their preferred coping strategy for academic stress (Problem-Focused, Emotion-Focused, Avoidance). The test yielded the following result:
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Interpret the results of this analysis. In your response, clearly explain:
Whether the result is statistically significant and why.
What this means about the relationship between year in school and coping strategy.
What the researcher should conclude based on these findings.
Chapter 5 Solutions
Introductory Statistics
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Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the net 16...Ch. 5 - Use the following information to answer the net 16...Ch. 5 - Use the following information to answer the net 16...Ch. 5 - For each probability and percentile problem, draw...Ch. 5 - For each probability and percentile problem, draw...Ch. 5 - For each probability and percentile problem, draw...Ch. 5 - For each probability and percentile problem, draw...Ch. 5 - For each probability and percentile problem, draw...Ch. 5 - For each probability and percentile problem, draw...Ch. 5 - For each probability and percentile problem, draw...Ch. 5 - Use the following information o answer the next...Ch. 5 - Use the following information o answer the next...Ch. 5 - Use the following information o answer the next...Ch. 5 - The time (In minutes) until the next bus departs a...Ch. 5 - Suppose that the value of a stock varies each day...Ch. 5 - A fireworks show is designed so that the time...Ch. 5 - The number of miles driven by a truck driver falls...Ch. 5 - Suppose that the length of long distance phone...Ch. 5 - Suppose that the useful life of a particular car...Ch. 5 - The percent of persons (ages five and older) in...Ch. 5 - The time (In years) after reaching age 60 that ft...Ch. 5 - The cost of all maintenance for a car during fts...Ch. 5 - 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