ttest mpg==19 One-sample t test Variable Obs Mean Std. err. Std. dev. [95% conf. interval] mpg 16 18.15625 .371031 1.484124 17.36542 18.94708 mean = mean(mpg) HO: mean = 19 t = -2.2741 Degrees of...

Based on the results

Extracted text: ttest mpg==19 One-sample t test Variable Obs Mean Std. err. Std. dev. [95% conf. interval] mpg 16 18.15625 .371031 1.484124 17.36542 18.94708 mean = mean(mpg) HO: mean = 19 t = -2.2741 Degrees of freedom = 15 Ha: mean < 19="" ha:="" mean="" !="19" ha:="" mean=""> 19 Pr(T < t)="0.0190" pr(|t|=""> |t|) = 0.0381 Pr(T > t) = 0.9810 A. The sample mean is 19 mpg. B. The sample standard deviation is 0.371. C. The two-sided null hypothesis is rejected at the 95% confidence level. D. There is a 0.981 probability that the fuel economy of this model is above 19 mpg.