International Business QNM222 Lecture Notes - Lecture 1: Null Hypothesis, Decision Rule

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QNM222
Proportion Reference Sheet (Part 2)
Sample Size and Proportion
1) Determine Confidence level and alpha
Alpha: = 1 – confidence
Confidence: = 1- alpha
Level of Significance = Alpha
2) Calculate z score:
z= normsinv(confidence + alpha/2)
3) Determine Margin of Error (E):
This will be stated in the question either directly (margin of error, error, or error rate),
or indirectly ( within X% ).
4) Calculate Sample Size:
n= p(1-p)(z/E)^2
Round up your answer to the next whole number.
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