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Question 19: It is rare that you will find a gas station these days that only sells gas. It has become more common to find a convenience store that also sells gas. We have collected data describing daily sales on 283 days at a franchise outlet of a major U.S. oil company. Each row summarizes sales for one day. This particular station sells gas, and it also has a convenience store and a car wash. One column of data labelled Sales gives the dollar sales of the convenience store (in $), and another column labelled Volume gives the number of gallons of gas sold (in gallon). The data give a covariance of Sales and Volume as 138,367.2 (in $ × gallon), and the following statistics. mean variance Sales 2,218.127 105,138.5 Volume 3,337.286 431,597.7 On a day, the station sold 4,165 gallons of gas, what is the width of an interval estimate of the sales at the attached convenience store with 99% confidence? Express your answer as a multiple of s, which denotes the standard error of the regression. (2.009 z?.???) s (0.191 z?.???) s (0.096 z?.???) s (2.127 z?.???) s (0.725 z?.???) s

          Question 19: It is rare that you will find a gas station these days that only sells gas. It
has become more common to find a convenience store that also sells gas. We have
collected data describing daily sales on 283 days at a franchise outlet of a major U.S.
oil company. Each row summarizes sales for one day. This particular station sells gas,
and it also has a convenience store and a car wash. One column of data labelled Sales
gives the dollar sales of the convenience store (in $), and another column labelled
Volume gives the number of gallons of gas sold (in gallon). The data give a covariance
of Sales and Volume as 138,367.2 (in $ × gallon), and the following statistics.

mean variance
Sales 2,218.127 105,138.5
Volume 3,337.286 431,597.7

On a day, the station sold 4,165 gallons of gas, what is the width of an interval
estimate of the sales at the attached convenience store with 99% confidence? Express
your answer as a multiple of s, which denotes the standard error of the regression.

(2.009 z?.???) s
(0.191 z?.???) s
(0.096 z?.???) s
(2.127 z?.???) s
(0.725 z?.???) s

Question 19: It is rare that you will find a gas station these days that only sells gas. It
has become more common to find a convenience store that also sells gas. We have
collected data describing daily sales on 283 days at a franchise outlet of a major U.S.
oil company. Each row summarizes sales for one day. This particular station sells gas,
and it also has a convenience store and a car wash. One column of data labelled Sales
gives the dollar sales of the convenience store (in ), and another column labelled
Volume gives the number of gallons of gas sold (in gallon). The data give a covariance
of Sales and Volume as 138,367.2 (in × gallon), and the following statistics.

mean variance
Sales 2,218.127 105,138.5
Volume 3,337.286 431,597.7

On a day, the station sold 4,165 gallons of gas, what is the width of an interval
estimate of the sales at the attached convenience store with 99% confidence? Express
your answer as a multiple of s, which denotes the standard error of the regression.

(2.009 z?.???) s
(0.191 z?.???) s
(0.096 z?.???) s
(2.127 z?.???) s
(0.725 z?.???) s

Added by Katherine M.

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