A Consumer Is Interested in Investigating the Difference in Price

Essay

A consumer is interested in investigating the difference in price between regular and premium gasoline at major filling stations in the U.S.A.An independent,random sample of stations is chosen and the prices per gallon are recorded for regular and premium gasoline.A histogram or Normal probability plot of the differences would be needed to verify the Nearly Normal Condition. $$\begin{array} { c | c | c } \text { Station } & \begin{array} { r } \text { Regular } \\( \$ / g a l )\end{array} & \begin{array} { c } \text { Premium } \\( \$ / g a l )\end{array} \\\hline \text { A } & 1.62 & 1.75 \\\text { B } & 1.52 & 1.59 \\\text { C } & 1.32 & 2.12 \\\text { D } & 2.02 & 2.14 \\\text { E } & 1.98 & 2.21 \\\text { F } & 1.83 & 1.89 \\\text { G } & 1.65 & 1.91 \\\mathrm { H } & 1.91 & 2.02 \\\text { I } & 1.75 & 1.89\end{array}$$