Chi-Squared Tests Flashcards
(3 cards)
1
Q
Goodness of Fit Test
A
probability that sample of categorical data comes from predetermined population
Ho= predetermined distribution is true
1.determine expected values
2. calculate x2 stat
3.x2 value is LB in x2cdf ->p-value
4. Reject/Faile to reject Ho
2
Q
Chi-Squared Distribution
A
right skewed, unimodal
x2cdf to calculate p-value
3
Q
Test for Homogeneity
A
test whether multiple populations/treatments have the same TRUE distribution
Ho= no difference between [variables] for [populations]
- expected values (row total*column total/table total)
2.calculate x2 for each cell
3.calculate p-value using x2cdf (df=(columns-1)(rows-1)) - evaluate