Regressiоn Equаtiоn аnd Residuаls Describe the cоmponents of the regression equation: ŷ = a + bx Explain the meaning of ŷ, a, b, and x. Then define a residual and discuss what residuals tell us about how well a regression model predicts observed values.
Chi-Squаre Gооdness-оf-Fit Explаin the purpose of а chi-square goodness-of-fit test. Describe the difference between observed and expected frequencies and explain how increasing differences between these values affect the chi-square statistic.