Mark Gershon, owner of a musical instrument dis-tributorship, thinks that demand for guitars may be related to the number of television appearances by the popular group Maroon 5during the previous month. Mark has collected the data shown inthe following table:DEMAND FOR GUITARS 3 6 7 5 10 7MAROON 5 TV APPEARANCES 347685a) Graph these data to see whether a linear equation mightdescribe the relationship between the group’s television showsand guitar sales.b) Use the least-squares regression method to derive a forecastingequation.c) What is your estimate for guitar sales if Maroon 5 performedon TV nine times last month?d) What are the correlation coefficient ( r ) and the coefficient ofdetermination ( r2 ) for this model, and what do they mean?
Mark Gershon, owner of a musical instrument dis-
tributorship, thinks that demand for guitars may be related to the
number of television appearances by the popular group Maroon 5
during the previous month. Mark has collected the data shown in
the following table:
DEMAND FOR GUITARS 3 6 7 5 10 7
MAROON 5 TV APPEARANCES 347685
a) Graph these data to see whether a linear equation might
describe the relationship between the group’s television shows
and guitar sales.
b) Use the least-squares regression method to derive a forecasting
equation.
c) What is your estimate for guitar sales if Maroon 5 performed
on TV nine times last month?
d) What are the
determination ( r2 ) for this model, and what do they mean?
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