Concept explainers
a.
To fill: The blanks in thegiven statement with appropriate words.
a.
Answer to Problem 67E
95%, 9.6956 and 15.0084.
Explanation of Solution
Given information:
Confidence interval is the
Thus, the complete statement is, “ We are
b.
To find:The 99% confidence interval.
b.
Answer to Problem 67E
The confidence interval is
Explanation of Solution
Given:
Confidence level = 99%
Formula used:
Calculation:
The value of
The 99% confidence interval using the provided output can be calculated as:
Hence, the confidence interval is
c.
To find: The
c.
Answer to Problem 67E
The required sample size is 72.
Explanation of Solution
Given:
Formula used:
Calculation:
The value of
The sample size at
Hence, the sample size is 72.
d.
To find: The sample size to have the margin of error of 1.5 at
d.
Answer to Problem 67E
The required sample size is 125.
Explanation of Solution
Given:
Formula used:
Calculation:
The value of
The sample size at
Hence, the sample size is 125.
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Chapter 8 Solutions
Elementary Statistics ( 3rd International Edition ) Isbn:9781260092561
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