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CHI_SQUARE
Course: MKT 202, Spring 2010School: DePaul
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SQUARE Myril CHI Hillman, Ph.D. 04/26/11 1 Chi Square: Test of Independence: Is there a significant difference between expected and observed frequencies? 04/26/11 2 Assumptions Random samples (big R) Not normal curve distribution Variables are qualitative Nominal/ordinal data: counts Frequencies (counts) in cells greater than 5 04/26/11 3 How to do it: formula Chi square: (observed expected)...
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SQUARE
Myril CHI Hillman, Ph.D.
04/26/11
1
Chi Square: Test of Independence:
Is there a significant difference between expected and observed frequencies?
04/26/11
2
Assumptions
Random samples (big R) Not normal curve distribution Variables are qualitative
Nominal/ordinal data: counts
Frequencies (counts) in cells greater than 5
04/26/11
3
How to do it: formula
Chi square: (observed expected) divided squared by expected X2 = (O E)2 E
04/26/11
4
O = observed frequency E = expected frequency
04/26/11
5
Example
Time urgency completing task for men vs. women
04/26/11
6
Degrees of Freedom
(#Rows 1)(#Columns 1)
04/26/11
7
Choose alpha level
04/26/11
8
Look up
What critical value of chi square did you need. Is your chi square as big or bigger?
If so, it is significant
04/26/11
9
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