Introduction to Business Statistics
7th Edition
ISBN: 9781111792374
Author: WEIERS
Publisher: Cengage Learning
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Textbook Question
Chapter 10.5, Problem 10.52E
In response to an inquiry from its national office, the manager of a local bank has stated that her bank’s average service time for a drive-through customer is93 seconds. A student intern working at the bank happens to be taking a statistics course and is curious as to whether the true average might be some value other than 93 seconds. The intern observes a simple random sample
of 50 drive-through customers whose average service time is 89.5 seconds, with a standard deviation of 11.3 seconds. From these sample results, and using the 0.05 level of significance, what conclusion would the student reach with regard to the bank manager’s claim?
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Students have asked these similar questions
1. Define probability:
2. Define statistics:
Results of tossing a coin four times: H, H, H, H
How many times is the Coin expected to come up heads? How did you determine this number?
Calculate the % deviation.
Can these results be used to conclude that a coin is not fair? Why or why not?
Cycles to
failure
Position in
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order
0.5
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(x;)
Problem 44
Marsha, a renowned cake scientist, is trying to determine how long different cakes can survive intense fork attacks before collapsing into crumbs.
To simulate real-world cake consumption, she designs a test where cakes are subjected to repeated fork stabs and bites, mimicking the brutal
reality of birthday parties. After rigorous testing, Marsha records 10 observations of how many stabs each cake endured before structural failure.
Construct P-P plots for (a.) a normal distribution, (b.) a lognormal distribution, and (c.) a Weibull distribution (using the information included in the
table below). Which distribution seems to be the best model for the cycles to failure for this material? Explain your answer in detail.
Observation
Empirical
cumulative
Probability distribution
Cumulative distribution
Inverse of cumulative
distribution F-1 (-0.5)
F(x))
(S)
n
4
3
1
0.05
9
5
2
0.15
7
7
3
0.25
1
10
4
0.35
3
12
5
0.45
Normal…
Chapter 10 Solutions
Introduction to Business Statistics
Ch. 10.1 - The president of a company that manufactures...Ch. 10.1 - Following a major earthquake, the city engineer...Ch. 10.3 - Prob. 10.28ECh. 10.3 - In the past, patrons of a cinema complex have...Ch. 10.3 - Following maintenance and calibration, an...Ch. 10.3 - A manufacturer of electronic kits has found that...Ch. 10.3 - A machine that fills shipping containers with...Ch. 10.5 - Prob. 10.40ECh. 10.5 - The average age of passenger cars in use in the...Ch. 10.5 - During 2008, college work-study students earned a...
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