Chi-Square Fisher McNemar Exam 2

Question 1

When would you use Chi-square test of homogeneity?

Answer 1

Nominal or dichotomous variable compared across two or more discrete independent groups that are part of one variable

Question 2

When would you use Fisher’s exact test?

Answer 2

• Nominal or dichotomous variable compared across two discrete independent groups that are part of one variable
• N < 20 or if there are < 5 in one of the cells

Question 3

When would you use McNemar test?

Answer 3

Dichotomous variable compared across matched measurements in two discrete dependent groups that are part of one variable

Question 4

Null hypothesis of Chi-square test of homogeneity

Answer 4

H0 -> population proportion of group A = population proportion of group B

Question 5

χ2 value

Answer 5

The larger the difference in proportions, the greater the value of χ2 and the more likely the difference is statistically significant (p < 0.05)