Concept explainers
Check whether which confidence level used in the sample 80%, 90%, 95%, or 99%.
Answer to Problem 9E
The confidence level used to construct the sample is 80%.
Explanation of Solution
Given Information:
The given figure is:
Calculation:
From the figure, the number of samples that do not contain true proportion mean = 4(represented by red lines).
Thus, 21 out of the 25 samples contain the true mean. Therefore,
The confidence level
Converting 0.84 into percentage.
Given confidence interval for each sample are 80%, 90%, 95% and 99%.
80% is the nearest confidence level to the calculated confidence level.
Hence, the confidence level use in the sample is 80%.
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