How to Calculate Chi Square?

How do you calculate chi square?

Chi Square Calculation

Chi square is used to investigate whether the distributions of categorical variables vary from one another. In other words it is the difference of the expected and observed data.

Formula:
Chi Square Statistic = { ( OV - EV)² / (EV) }
Where,
OV = Observed Value
EV = Expected Value

Step 1: Let us consider an example,
Observed Value = 40
Expected Value = 25

Step 2: Substitute the values in the formula,
Chi Square Statistic = { ( OV - EV)² / (EV) }
= (40-25)² / 25
= 225 / 25
Chi Square = 9

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