Key Terms
Population mean
Mu = df Population std dev: sigma = sqrt(2 * df)
Scenario
An airline claims its flight delays have a variance of no more than 150 minutes. A traveler records 25 flights and gets
Observed
Mon=15, Tue=12, Wed=9, Thu=9, Fri=15 Expected: 12 for each
Same formula
Chi-squared = sum of [ (O - E)^2 / E ] over all cells (i * j cells)
Think of it this way
Independence asks "are these two variables related in one population?" Homogeneity asks "do these two separate populatio
Same formula as independence
Chi-squared = sum of [ (O - E)^2 / E ]
Note
This is based on response categories, not on the two populations being compared.
Sample
250 males, 300 females. df = 4 - 1 = 3 (four response categories)