biostats proportions quiz

binomial test

1 categorical variable with 2 levels

2 levels of binomial test

success or failure

what does binomial test do

tests if observed propertion matches an expected proportion (H0)

• provides an exact probability using the binomial distribution

X² goodness of fit test

1 categorical variable with 2+ levels

what does x2 goodness of fit test do

tests if observed propoertions match expected propoertions for 2 or more groups

example of binomial test

how likely is it that 4 MCQ out of 10 were correct by chance alone

example of x2 goodness of fit test

are more professional hockey players born in the early months of the year than expected by chance? (12 levels for 12 months)

x2 contingency test

2+ categorical variables

what does x2 contingency test do

tests null hypothesis of no association between 2 or more categorical variables

null hypothesis of x2 contingency test

each of the variables is independent of the others

x2 contingency test example

is playing french or german music independent of likelihood to buy french or german wine?