The data below is a sample of miles per gallon (mpg) and Engine horsepower (horsepower) of certain type of cars. Fit a least squares regression line of mpg on horsepower and test the significance of the model at 5% significance level. 23 20 33.8 14 26 30 24 28.8 18 28 17 15 29 18.2 33 horsepower 125 100 67 165 46 68 75 115 105 90 140 130 78 135 53 mpg (d) The intercept is 38.74 (i) The critical value for testing significance of the model using the F test is (k) The absolute value of the critical value for testing the significance of the model using the t-test is (1) The upper bound for the 95% confidence interval of the intercept is

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