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# Identifying Parameters

APSTAT-W2NK1L

When performing a significance test for a least-squares regression line, what parameter can be tested?

A

The proportion of observations that lie on the line.

B

The average $x$-value in a set of observations that determine a roughly linear relationship.

C

The mean $y$-value in a set of observations that determine a roughly linear relationship.

D

The slope of the line relating two quantitative variables.

E

The variability found in the sample.