Concept explainers
To explain: The reason to use the t distribution to construct the confidence interval for population
Answer to Problem 81E
(b) option is correct.
Explanation of Solution
Given:
There are 5 provided options.
Z-distribution is used to compute the confidence interval for population mean when the value of the standard deviation is known. On the contrary, t -distribution is used to calculate the critical value when the sample standard deviation is known.
Thus, the option (b) seems correct.
Chapter 8 Solutions
PRACTICE OF STATISTICS F/AP EXAM
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