STATS:DATA+MODELS-W/DVD
4th Edition
ISBN: 9780321986498
Author: DeVeaux
Publisher: PEARSON
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Chapter 15.1, Problem 1JC
a.
To determine
Find the
b.
To determine
Find the
c.
To determine
Explain the meaning of the expected cost of repair.
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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
where U. Vindp.rus
+> 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 15 Solutions
STATS:DATA+MODELS-W/DVD
Ch. 15.1 - 1. One of the authors took his minivan in for...Ch. 15.3 - 2. Suppose the time it takes a customer to get and...Ch. 15 - Prob. 1ECh. 15 - 2. Caffeinated A coffee shop tracks sales and has...Ch. 15 - 3. Oranges again What is the standard deviation...Ch. 15 - 4. Caffeinated again What is the standard...Ch. 15 - 5. Salary An employer pays a mean salary for a...Ch. 15 - 6. Golf scores A golfer keeps track of his score...Ch. 15 - 13. Battery The life span of a calculator battery...Ch. 15 - 14. Ketchup An automatic filling machine in a...
Ch. 15 - 15. Expected value Find the expected value of each...Ch. 15 - 16. Expected value Find the expected value of each...Ch. 15 - 17. Pick a card, any card You draw a card from a...Ch. 15 - 18. You bet! You roll a fair die. If it comes up a...Ch. 15 - 19. Kids A couple plans to have children until...Ch. 15 - 20. Carnival A carnival game offers a $100 cash...Ch. 15 - 21. Software A small software company bids on two...Ch. 15 - Prob. 16ECh. 15 - Prob. 17ECh. 15 - Prob. 18ECh. 15 - Prob. 19ECh. 15 - 26. The die Find the standard deviation of the...Ch. 15 - Prob. 21ECh. 15 - Prob. 22ECh. 15 - Prob. 23ECh. 15 - 30. Red lights A commuter must pass through five...Ch. 15 - 31. Defects A consumer organization inspecting new...Ch. 15 - 32. Insurance An insurance policy costs $100 and...Ch. 15 - Prob. 27ECh. 15 - Day trading An option to buy a stock is priced at...Ch. 15 - Prob. 29ECh. 15 - 36. Contracts Your company bids for two contracts....Ch. 15 - Prob. 31ECh. 15 - Prob. 32ECh. 15 - Prob. 33ECh. 15 - Prob. 34ECh. 15 - Random variables Given independent random...Ch. 15 - 42. Random variables Given independent random...Ch. 15 - Prob. 37ECh. 15 - 44. Garden A company selling vegetable seeds in...Ch. 15 - Prob. 39ECh. 15 - Stop! Find the mean and standard deviation of the...Ch. 15 - Tickets A delivery company’s trucks occasionally...Ch. 15 - Donations Organizers of a televised fundraiser...Ch. 15 - 49. Fire! An insurance company estimates that it...Ch. 15 - Prob. 45ECh. 15 - 52. Pets The American Veterinary Association...Ch. 15 - Prob. 47ECh. 15 - More pets You’re thinking about getting two dogs...Ch. 15 - 55. Medley In the 4 × 100 medley relay event, four...Ch. 15 - Prob. 50ECh. 15 - Prob. 51ECh. 15 - 58. Bike sale The bicycle shop in Exercise 56 will...Ch. 15 - 59. Coffee and doughnuts At a certain coffee shop,...Ch. 15 - Prob. 54E
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