Concept explainers
To find out how large the sample size is needed, if the survey firm wants the standard deviation of the sampling distribution of
Answer to Problem AP4.11CPT
Option (b) is the correct option.
Explanation of Solution
A survey firm wants to ask a random sample of adults in Ohio if they support an increase in the sales tax, with additional revenue going to education.
It is given:
The standard deviation of the sampling distribution is given by:
Now, we will evaluate the equation to find n as:
Now, putting the values in the formula above:
Thus the required sample size is
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