Construct Confidence Intervals for a Mean Response
-When constructing a confidence interval about the mean response of $y$ in a linear regression, the $t$-distribution is used with _____degrees of freedom.
A) $n - 2$
B) $n - 1$
C) $\mathrm { n } + \mathrm { k } - 2$
D) $n _ { 1 } + n _ { 2 } - 2$

Question

Quizplus · Accepted Answer

The degrees of freedom for a confidence interval about the mean response in a linear regression model are $n - 2$, where $n$ is the number of observations. This accounts for the two parameters estimated in simple linear regression: the slope and the intercept.

Construct Confidence Intervals for a Mean Response -When Constructing a Confidence

Construct Confidence Intervals for a Mean Response
-When Constructing a Confidence