Imagine That You Were Told That the T-Statistic for the Slope

Imagine that you were told that the t-statistic for the slope coefficient of the regression line $\widehat {\text { TestScore }}$ = 698.9 - 2.28 × STR was 4.38. What are the units of measurement for the t-statistic?

A) points of the test score
B) number of students per teacher
C) $\frac { \text { TestScore } } { S T R }$
D) standard deviations