Show some computer output for fitting simple linear models. State the value of the sample slope for each model and give the null and alternative hypotheses for 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.

Coefficients: Estimate Std.Error t value Pr(> [t|) 87.78 1.199 (Intercept) 807.79 -3.659 9.30 -3.05 0.000 0.006 A