Suppose you wanted to find a critical test statistic for a confidence interval for the slope of the regression line. How many degrees of freedom would you need to use?

See Explanation

Step-by-step explanation:

The question is incomplete, as the regression line is not given.

However, I will give a general explanation of how to calculate the degree of freedom of a slope of regression line

The degree of freedom is calculated using:

Where

For a regression line; there are two parameters that are being estimates;

The intercept and the slope. So:

Hence, the degree of freedom of a slope of regression line is:

So; if for example

the degree of freedom will be: