The Makers of Streamer Automobiles Wish to Compare Two Possible $\alpha$

Short Answer

The makers of Streamer automobiles wish to compare two possible carburetors for use in their larger V-6 model with regard to gasoline consumption. Eight new Streamers with V-6 engines are randomly divided into two groups. One group has Type L carburetors installed and the other, Type M carburetors. The following are the results of standard city mileage tests on the Streamers (in mpg):
Set up

and
; perform the test ( $\alpha$ = .05), and draw final conclusions.