Concept explainers
To explain how to adjust
Answer to Problem 56E
Multiply the sample size by 4.
Explanation of Solution
Given:
We reduce the margin of error from 3 percentage points to 1.5 percentage points.
Formula:
Margin of error:
As per given information, we reduce the margin of error from 3 percentage points to 1.5 percentage points. That means, need to divide by 2 on both sides of formula.
The margin of error is,
Therefore, the sample size n should be replaced by 4n.
Chapter 8 Solutions
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