The Table Below Gives Information Concerning the Gasoline Mileage for Random

The table below gives information concerning the gasoline mileage for random samples of trucks of two different types.Find a 95% confidence interval for the difference in the means $\mu_\mathrm { X }$ - $\mu_Y$ . $$\begin{array} { l | c c } & \text { Brand } \mathrm { X } & \text { Brand Y } \\\hline \text { Number of Trucks } & 50 & 50 \\\text { Mean mileage } & 20.4 & 24.9 \\\text { Standard Deviation } & 2.3 & 1.8\end{array}$$

A) (3.68,5.32)
B) (-5,-4)
C) (4,5)
D) (-5.32,-3.68)
E) (20.4,24.9)

Correct Answer:

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