Question

A trucking company would like to compare two different routes for efficiency. Truckers are randomly assigned to two different routes. Twenty truckers following Route A report an average of 42 minutes, with a standard deviation of 4 minutes. Twenty truckers following Route B report an average of 47 minutes with a standard deviation of 3 minutes. Histograms of travel times for the routes are roughly symmetric and show no outliers.

a) Find a 95% confidence interval for the difference in the commuting time for the two routes.

b) Does the result in part (a) provide sufficient evidence to conclude that the company will save time by always driving one of the routes? Explain.

Answer #1

Two men, A and B, who usually commute to work together
decide to conduct an experiment to see whether one route is faster
than the other. The men feel that their driving habits are
approximately the same, so each morning for two weeks one driver is
assigned to route I and the other to route II. The times, recorded
to the nearest minute, are shown in the following table. Using this
data, find the 98% confidence
interval for the true...

Morgan wants to test the speed for two different routes she can
take to ride her bicycle home from work. Route A involves riding
her bicycle on a busy road, and Route B involves riding her bicycle
along a scenic trail.
Morgan collects some initial data, given in the table below:
Route A
Route B
?⎯⎯⎯=10 minutes
?⎯⎯⎯=7 minutes
?=4 minutes
?=5 minutes
?=7
?=6
Based on Morgan's initial data, she conducts a hypothesis test
to determine whether there is...

Question 1: The director of a green energy
company is interested in comparing two different methods of
installing solar light panels. An experiment is conducted with 31
technicians using the old method and the other 46 technicians using
the new method. For the 31 technicians using the old method, the
average time was 525 minutes with 47.7 standard deviation. For the
46 technicians using the new method, the average time was 520
minutes with 48.2 standard deviation. Conduct an analysis...

The manager of a door-making company would like to estimate the
amount of time it takes for a piece of wood to be moved, cut, and
packaged at two different plants. At Plant A, the manager observed
21 pieces that processed with an average time of 14.2 minutes and
standard deviation of 2.6 minutes. At the second plant, the manager
observed 19 pieces with an average time of 13.1 minutes with a
standard deviation of 1.9 minutes.
a. Test whether...

The director of a green energy company is interested in
comparing two different methods of installing solar light panels.
An experiment is conducted with 30 technicians using the old method
and the other 45 technicians using the new method. For the 30
technicians using the old method, the average time was 643 minutes
with 57.9 standard deviation. For the 45 technicians using the new
method, the average time was 499 minutes with 93.6 standard
deviation.
Conduct an analysis to determine...

A manufacturing company is comparing the time needed to build a
product using two different assembly methods, A and B. Sample data
compiled from each method appears below. Using the 5% significance
level, test the claim that the mean time needed for Method A is
less than that of Method B (claim: μA <
μB) by choosing the correct answer below.
Test statistic: ‒2.64, Critical value(s): ‒1.645, Conclusion:
The data support the claim that the mean time for Method A...

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INNOVATION
Deep Change: How Operational Innovation Can Transform Your
Company
by
Michael Hammer
From the April 2004 Issue
Save
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8.95
In 1991, Progressive Insurance, an automobile insurer based in
Mayfield Village, Ohio, had approximately $1.3 billion in sales. By
2002, that figure had grown to $9.5 billion. What fashionable
strategies did Progressive employ to achieve sevenfold growth in
just over a decade? Was it positioned in a high-growth industry?
Hardly. Auto insurance is a mature, 100-year-old industry...

What role could the governance of ethics have played
if it had been in existence in the organization? Assess the
leadership of Enron from an ethical perspective.
THE FALL OF ENRON: A STAKEHOLDER FAILURE
Once upon a time, there was a gleaming headquarters
office tower in Houston, with a giant tilted "£"' in front, slowly
revolving in the Texas sun. The Enron Corporation, which once
ranked among the top Fortune 500 companies, collapsed in 2001 under
a mountain of debt...

Discuss ethical issues that can be identified in this
case and the mode of managing ethics Enron finds itself in this
case. How would you describe the ethical culture and levels of
trust at Enron? Provide reasons for your assessment.
THE FALL OF ENRON: A STAKEHOLDER FAILURE
Once upon a time, there was a gleaming headquarters
office tower in Houston, with a giant tilted "£"' in front, slowly
revolving in the Texas sun. The Enron Corporation, which once
ranked among...

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