Flashcards in Chi Square Test, McNemar Test Deck (8)
A Chi Square Test is...
used to compare two or more independent groups for their proportions
a statistical hypothesis test that uses a test statistic with a known probability distribution of chi-square distribution
How can you test statistically the effect of a new medication over the standard treatment on hypertensive subjects?
Run a statistical hypothesis test to compare the proportions of those who were responsive between experimental vs control groups.
Degree of Freedom
number of values that are free to vary as you estimate parameters
[a/(a+b)] / [c/(c/d)]
Assumptions for valid chi square tests
groups are independent
the value of the cell expected count should be 5 or more in at least 80% of cells
no cell should have an expected count less than 1
form of chi square test used with 2x2 contingency table that involved matched samples, where subjects act as their own controls