1. Adjusted R2 is less than regular R2.
2. The statistic se falls when an explanatory variable is added to a regression model.
3. A slope in a simple regression is known as a partial slope because it ignores the effects of other explanatory variables.
4. A partial slope estimates differences between average values of observations y that match on the other explanatory variables.
5. The partial slope for an explanatory variable has to be smaller in absolute value than its marginal slope.
6. If the confidence interval for the marginal slope of X1 includes zero, then the confidence interval for its partial slope includes zero as well.