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).

(Enter your answer to two decimal places. For "0.98", you would write 0.98).

If your result is negative, introduce the minus sign. Use as many decimals as possible in your intermediate computations. Do not round.