Math 1530-017 Exam 1 With Answer Key - 2009 Page 10
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11Use the following information and regression line to answer the next two questions.
37. The least-squares regression line is ˆ y =
0.879x + 188, or in the form of Minitab output
Length = 188
0.0879×Year
What is the residual for the year 1945 in which the average length of a film was 17.41 minutes?
(a) 0.38 minutes
(b) 0 minutes
(c) 17.03 minutes
(d) 188
(e)
0.0879 minutes
38. Suppose we use the formula from the previous problem to estimate how long a Three Stooges film
would have been in 1965, if the Stooges had continued to make films. This is an example of
(a) extrapolation.
(b) correlation.
(c) a lurking variable.
(d) an influential observation.
(e) causation.
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