Concept explainers
(a)
To describe the relationship between length and sales.
(a)

Explanation of Solution
Direction: It is positive because the pattern in the
Form: It is linear because there is no strong curvature present in the scatter plot.
Strength: It is strong because the points in the scatter plot do not deviate much from the general pattern in the points.
Unusual features: There are no outliers because there appear to be no points that deviate strongly from the general pattern in the data.
Thus there is strong, positive and linear relationship between shelf length and sales.
(b)
To write the equation of least square regression line.
(b)

Answer to Problem AP1.17CPT
ˆy=317.94+152.680x .
Explanation of Solution
Let:
x =Shelf length
y =Sales
General equation is ˆy=a+bx of the regression line.
The y -intercept is given in the row “Constant” and in the column “Coef” of the given table:
a=317.94
The slope b is given in the row “Shelf length” and in the column “Coef” of the given table:
b=152.680
We then obtain:
ˆy=a+bx=317.94+152.680x
(c)
To find out what is the best estimate of the weekly sales revenue.
(c)

Answer to Problem AP1.17CPT
The best estimate is 1081.34 .
Explanation of Solution
It is given that:
ˆy=317.94+152.680x
Thus, at x=5 :
ˆy=317.94+152.680x=317.94+152.680(5)=1081.34
x=5 since they are looking weekly revenue sales.
Thus the best estimate is 1081.34 .
(d)
To interpret the value of s .
(d)

Answer to Problem AP1.17CPT
s=22.9212
Explanation of Solution
The standard deviation of the residual is given after “S=” in the computer output:
s=22.9212
The standard deviation of the residual is the average discrepancy between the observed y -values and the predicted y - values.
On average, the predicted sales deviate by 22.9212 dollars from the actual sales.
(e)
To identify and interpret the coefficient of determination.
(e)

Answer to Problem AP1.17CPT
r2=98.2% .
Explanation of Solution
The coefficient of determination is:
r2=98.2%
98.2% of the variation in the amount of sales in dollars can be accounted for by the LSRL that is dependent upon the shelf length in feet.
Chapter 4 Solutions
PRACTICE OF STATISTICS F/AP EXAM
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