Concept explainers
To find the number of people they would need to interview.
Answer to Problem 9.14E
The number of people = 601
Explanation of Solution
Given:
Confidence level = c = 0.95
Margin of error = 4% = 0.04
Formula:
Calculation:
Confidence level = c = 0.95, so level of significance = a = 1-0.95 − 0.05
Z critical value can be found either by using standard normal table or excel formula.
So, Zc =Za/2 = Z0.05/2
Using excel
Zc = 1.96
We don’t have preliminary population proportion, hence using p = 0.05
Chapter 9 Solutions
Statistics Through Applications
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