Chapter 2 - Chi-Squared Tests

Question 1

Chi-squared tests

Answer 1

• 3 types (goodness of fit, independence, homogeneity)
• want to see if it follows a hypothesised distribution
• degrees of freedom: k-1

Question 2

Test statistic

Answer 2

Sum ([ observed-expected data]^2/expected variation)

• [OV - what we expect if H0 = True]/average variation we expect to see
• T.S let’s us quantify how close things are to our expectations/theories

Question 3

Small p-value

Answer 3

Reject H0