Concept explainers
To find: The option that could be the 95% confidence interval.
Answer to Problem 7PT
The confidence interval is
Explanation of Solution
Given:
Confidence level = 95%
90% confidence level is
Formula used:
The formula to compute the confidence interval for population mean is:
The width of the confidence interval is represented by the margin of error and width is directly related to the level of confidence.
Here, if 95% confidence level is used instead of 90% then the confidence interval would be wider which means that the margin of error should be above 3. So, out of all the options, the confidence interval that has the larger margin of error is
Thus, the correct option is (d).
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