Computer output for fitting a simple linear model is given below. State the value of the sample slope for the given model. In testing if the slope in the population is different from zero, identify the P-value and use it (and a 5% significance level) to make a clear conclusion about the effectiveness of the model. The regression equation is : Y= 93.9 - 6.86X
Predictor Coef SE Coef T P
Constant 84.24 12.09 6.97 0.000
X -0.01238 0.01032 -1.20 0.245

a. Is the model effective?
b. Does X appear to be an effective predictor of the response variable Y?