Introductory Statistics
1st Edition
ISBN: 9781938168208
Author: Barbara Illowsky, Susan Dean
Publisher: OpenStax College
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Textbook Question
Chapter 7, Problem 76H
The attention span of a two-year-old is exponentially distributed with a
a. InwordsX ______
b.X” ( )
c. In words. X _____________
d. X ___(______
e. Befoic doing any calculations, which do you think will be higher? Explain why.
I. The
U. The probability that the average attention span for the 60 chIldren Is less than ten minutes?
f. Calculate the probabilities in pan e.
g. Explain why the distribution for X is not exponential.
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BUSINESS DISCUSS
A researcher wishes to estimate, with 90% confidence, the population proportion of adults who support labeling
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(b) Find the minimum sample size needed, using a prior study that found that 65% of the respondents said they support
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(c) Compare the results from parts (a) and (b).
...
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n =
(Round up to the nearest whole number as needed.)
The table available below shows the costs per mile (in cents) for a sample of automobiles. At a = 0.05, can you conclude that at least one mean
cost per mile is different from the others?
Click on the icon to view the data table.
Let Hss, HMS, HLS, Hsuv and Hмy represent the mean costs per mile for small sedans, medium sedans, large sedans, SUV 4WDs, and minivans
respectively. What are the hypotheses for this test?
OA. Ho: Not all the means are equal.
Ha Hss HMS HLS HSUV HMV
B. Ho Hss HMS HLS HSUV = μMV
Ha: Hss *HMS *HLS*HSUV * HMV
C. Ho Hss HMS HLS HSUV =μMV
= =
H: Not all the means are equal.
D. Ho Hss HMS
HLS HSUV HMV
Ha Hss HMS
HLS =HSUV = HMV
Chapter 7 Solutions
Introductory Statistics
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