Consider the following data points, where the first coordinate corresponds to x and the second coordinate corresponds to y:

(0,0)

(1,0)

(2,0)

(3,?)

Observe there is a missing value (?).

It is known that the Adjusted r Squared is 0.4 and the mean residual sum of squares is 9.6

Compute the t-statistic used to test the null hypothesis: slope of regression equal to -2 (minus 2).