Concept explainers
To find: The 90% confidence interval for the true mean weight of an Oreo cookie.
Answer to Problem 71E
The confidence interval is (11.37, 11.42)
Explanation of Solution
Given:
Sample mean
Sample standard deviation
Formula used:
The formula to compute the t - confidence interval for population mean is:
Calculation:
Here, t -confidence interval is to be used because population standard deviation is unknown.
The obtained excel output is:
Thus, the required confidence interval is (11.37, 11.42)
Chapter 8 Solutions
PRACTICE OF STATISTICS F/AP EXAM
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