CHAPTER 4 ASSIGNMENT
Q1)
The fuel tank capacity in gallons and the cruising range is given for 6 SUV’s.
Capacity in gallons
Cruising range in miles
22
445
21
405
23
410
24
420
24
365
a.
Develop a scatter diagram for the data.
b.
How would you characterize the relationship between fuel tank capacity and
cruising range?
c.
Estimate the cruising range in miles of a car having fuel tank capacity of 23
gallons
d.
what is the cruising range in miles of a car having fuel tank capacity of 23 gallons
Q2)
A study is conducted concerning automobile speeds and fuel consumption rates. The following data
is collected:
a.
Plot these data in a scatter diagram.
b
.
Compute the coefficient of correlation.
Q3).
A realtor wanted to determine if there was a relationship between the size (in 100 square
feet) of a new custombuilt home and the price (in thousands of dollars) of the home.
Find the equation of the regression line and graph the line on a scatter plot.
Size,
x
Price,
y
26
235
27
273
41
387
29
253
33
295
34
335
36
395
45
475
22
203
a.
Plot these data in a scatter diagram.
b.
Determine the coefficient of correlation.
c.
Determine the coefficient of determination. Comment on the strength of the association
between the two variables.
d.
Determine the regression equation.
e.
Interpret the regression equation. Where does the equation cross the
Y
axis?
Q4).
there is a believe
that
there is a relationship between the number of new cars sold and the number
of sales people on duty. To investigate he selects a sample of eight weeks and determines the number
of new cars sold and the number of sales people on duty for that week.
Speed
MPG
44
22
51
26
48
21
60
28
66
33
61
32
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a.
Plot these data in a scatter diagram.
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 Spring '12
 johnanderson
 Statistics, Coefficient Of Determination, Correlation, Least Squares, Linear Regression, Regression Analysis, regression line

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