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# Two-Way Table

• Studies the association between two categorical variables

# Percentage Table

• Divide each cell by the total count

# Joint, Marginal, Conditional

• Joint: percentage of a combination of the two factors (look for the key word "and")
• Marginal: percentage of a single factor
• Conditional: percentage of a single factor given that we know the value of the other factor

# Example

• What percentage of students have low physical activity and high fruit consumption? (Joint)

# Example

• What percentage of students have moderate physical activity? (Marginal)

# Example

• What percentage of students have low fruit consumption within the group of moderate physical activity? (Conditional)
• 17.4% / 37.4% = 46.5%

# The Chi-square Test

• Test whether the two factors have association

# Condition to Use Chi-square Test

• For tables larger than 2x2

• The average of the expected counts is 5 or more and the smallest expected count is 1 or more
• For 2x2 tables

• All 4 expected cell counts are 5 or more

# Enter Data in SPSS

• Remember to do the WEIGHT CASES

# Last Words

• Thanks for your hard work in this lab
• You are all GREAT!