Question
The following data have to do with the relationship between maternal smoking (# of cigarettes smoked per day, which is variable X) and infant birth
The following data have to do with the relationship between maternal smoking (# of cigarettes smoked per day,
which is variable X) and infant birth weight (which is variable Y). (X, X2, Y, Y2,and XY have already been
calculated for you and are shown below in red font.)
Cigarettes Per Day (X) X2 Infant Birth Weight (Y) Y2 XY
24 7.5 56.2515.0
6367.2 51.84 43.2
10 100 6.9 47.6169.0
12 144 6.2 38.4474.4
14 196 5.8 33.64 81.2
X = 44 X2 = 480 Y = 33.6 Y2 = 227.78 XY = 282.8
What is the y-intercept (a)for this data?
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