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7. The table gives the number of songs
downloaded from MyTunes at different
prices per song.
a. Find the equation of the linear
regression line. Round the slope and
y-intercept to the nearest hundredth.
b. What is the slope of the linear
regression line?
c. What are the units of the slope when
it is expressed as a rate?
d. Based on the linear regression line,
how many thousands of downloads
would MyTunes expect if the price was changed to $0.45? Round
to the nearest integer.
e. Is your answer to part d an example of interpolation or
extrapolation?
f. Find the correlation coeffi cient to the nearest hundredth.
g. Describe the correlation.

Price Number of
Per Downloads
Song ( in thousands)
$0.89 1,212
$0.79 1,704
$0.69 1,760
$0.59 1,877
$0.49 1,944
$0.39 2,011

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