Which equation of the least squares regression line most closely matches the data set?
note: the variable x represents the years after 1972.
x y
1972 - 28
1974 8
1976 39
1978 62
1980 98
a. y = 0.06x - 28
b. y = 15.3x - 25.4
c. y = 15.3x + 25.4
d. y = 1.03x - 56
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