A study was conducted to examine the quality of fish after seven days in ice sto

Question

A study was conducted to examine the quality of fish after seven days in ice storage. For this study: Y = measurement of fish quality (on a 10 point scale with 10 = BEST.); X = # of hours after being caught that the fish were packed in ice. The sample linear regression line is: Y = 8.5.5(X). From this we can say that:

a. Can’t really say until we see a plot of the data. b. A one hour delay in packing the fish in ice increases the estimated quality by .5 c. A one hour delay in packing the fish in ice decreases the estimated quality by .5 d. If the estimated quality increases by 1 then the fish have been packed in ice one hour sooner. e. If the estimated quality increases by 1 the fish have been packed in ice two hours later.

Explanation / Answer

Slope of the regression line is -0.5. It shows that for each unit increase in independent variable, dependnet variable is decreased by 0.5 units. So option c

"A one hour delay in packing the fish in ice decreases the estimated quality by .5 d."

is correct.

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