
Concept explainers
To find: that to give 90% confidence interval for the

Answer to Problem 10.40E
(123.1622, 129.0378)
Mean did not differ significantly from 128 at the 10% level
Explanation of Solution
Given:
Formula used:
Confidence interval
Calculation:
For confidence level
The margin of error is then:
Confidence intervals are
It is expected that 128 to be inside this interval, because it is concluded that the mean did not differ significantly from 128 at the 10% level of significance and a 90% confidence interval associates with a significant test at the 10% level.
Chapter 10 Solutions
Statistics Through Applications
Additional Math Textbook Solutions
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Elementary Statistics (13th Edition)
Thinking Mathematically (6th Edition)
A Problem Solving Approach To Mathematics For Elementary School Teachers (13th Edition)
A First Course in Probability (10th Edition)
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