Chi Squared

Question 1

Chi Square

Answer 1

• Nominal or Ordinal Scale (Yes/No, Pathology/No Pathology)
• Determines difference between observed and expected proportions seen in categories (Ex: Expected Fall or No Fall = 50%, Observed 20%.

Question 2

Two General Assumptions - Chi Squared

Answer 2

• Frequencies represent original counts, data is actual number of people, objects or events and is not a summary statistics
• Categories are exhaustive and mutually exclusive (Fit into one category); Ex: 4 categories, they all fit in one of the four.

Question 3

Chi Square is useful for:

Answer 3

• Seeing proportions of males and females assigned to groups when proportional
• Age groups were represented in experimental groups

Question 4

Not useful for:

Answer 4

• Not as an alternative for more precise tests
• Nominal data
• Studies with a small n (less than 10)