Question
In: Statistics and Probability
7. The National Technology Readiness Survey sponsored by the Smith School of Business at the University...
7. The National Technology Readiness Survey sponsored by
the
Smith School of Business at the University of Maryland
surveyed 418 randomly sampled Americans, asking them how often they
delete spam emails. In 2004, 23% of the respondents said they
delete spam mail once a month or less, and in 2009 this value was
16%.
(a) What are the hypotheses for evaluating if the proportion
of those who delete their email once
a month or less has changed from 2004 to 2009?
bb
(b) What is the point estimate for the deference between the
two population proportions?
(c) A report on the survey states that the observed decrease
from 2004 to 2009 is statistically
significant. Explain what this means in context of the
hypothesis test and the data. (d) Would you expect a confidence
interval for the deference between the two population proportions
to contain 0? Explain your reasoning
Solutions
Expert Solution
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orchestra answered 1 year agoRelated Solutions
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A professor in the school of business at a certain university wants to investigate the claim...
A professor in the
school of business at a certain university wants to investigate the
claim that the prices of new textbooks in the campus store are
higher than a competing national online bookstore by more than 50
cents. The professor randomly chooses required texts for 12
business school courses. Use α=0.05α=0.05. The data is given in the
table below.
Book
Campus Store
Online Store
A
108.51
109.42
B
200.06
201.93
C
223.52
226.39
D
186.12
183.9
E
121.65
122.13...
A professor in the school of business at a certain university wants to investigate the claim...
A professor in the
school of business at a certain university wants to investigate the
claim that the prices of new textbooks in the campus store are
higher than a competing national online bookstore. The professor
randomly chooses required texts for 12 business school courses. The
data is given in the table below.
Book Number
Campus Store
Online Store
Book 1
125.45
124.27
Book 2
88.37
86.21
Book 3
230.98
229.6
Book 4
151.8
153.02
Book 5
236.44
237.4
Book...
A professor in the school of business at a certain university wants to investigate the claim...
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wants to investigate the claim that the prices of new textbooks in
the campus store are higher than a competing national online
bookstore by more than 50 cents. The professor randomly chooses
required texts for 12 business school courses. Use
α=0.05
. The data is given in
the table below.
Book
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Online Store
A
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171.56
B
155.76
154.72
C
108.11
106.57
D
161.67
156.68
E
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risk in school/university: business risk, operation risk and financial risk
risk in school/university: business risk, operation risk
and financial risk
At a Midwestern University the 450 students in the Business School were classified according to their...
At a Midwestern University the 450 students in the
Business School were classified according to their major within the
business school and their gender. The results are:
Female
Male
Total
Accounting
68
56
124
Administration
91
40
131
Economics
5
6
11
Finance
61
59
120
Other
39
25
64
Total
264
186
450
Complete a table for marginal distribution.
Complete a table for Conditional distribution
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