Chi-Square Flashcards
what do parametric tests make assumptions about?
population parameters
what do parametric tests require?
interval or ratio scale data
what can non-parametric tests be used as?
an alternative as distribution-free tests
what do non-parametric tests require?
nominal data, but they are not as powerful and may fail to detect differences
what does the goodness for fit test look at?
categories of one variable
what is the goodness for fit test used on?
used on unrelated data to answer questions about the proportions of a population distribution
X^2
the observed and expected frequencies
what are observed frequencies?
number of participants measured in individual categories
no preference null hypothesis
number of people would be predicted to be equal between the two categories
expected frequencies
(proportion x sample size)
x^2 formula
sigma (fO - fE) ^2 / fE
goodness of fit- degrees of freedom
(c-1)
what does the test of independence look at?
the relationship between two variables to observe whether they are independent or associated
what is compared in tests of independence?
frequency data to expected frequencies from the null hypothesis
test of independence- what does Ho state?
the two variables are completely independent and do not affect each other
