It has become common to find a convenience store that also sells gas. These data describe the sales over time
(a) Give a confidence interval for the difference in average sales in the convenience store between days on which the station sells 2,000 gallons of gas and those on which the station sells 3,000 gallons.
(b) Is $1,800 an unusually low level of sales in the convenience store on a day that the pumps record having sold 3,000 gallons?
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Question Posted: July 14, 2015 09:45:26