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

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28 Jul 2016

School

Department

Professor

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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