Concept explainers
(a)
To explain how large a random sample is required to obtain a margin of error of at most
(a)
Answer to Problem 49E
Explanation of Solution
It is given that:
Now, we know that the formula for
For confidence level
Thus,
(b)
To answer the question in part (a) again but this time use the conservative guess
(b)
Answer to Problem 49E
The sample size increased by
Explanation of Solution
It is given that:
From part (a) we have,
Now, we know that the formula for sample size is as:
For confidence level
Thus,
Thus, the difference between the two sizes is as:
Thus, we note that the sample size increased by
Chapter 8 Solutions
PRACTICE OF STATISTICS F/AP EXAM
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