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)X²Infant Birth Weight (Y)Y²XY

247.556.2515.0

6367.251.8443.2

101006.947.6169.0

121446.238.4474.4

141965.833.6481.2

X = 44X²= 480Y = 33.6Y²= 227.78XY = 282.8

What is S_y(the standard deviation of Y)?In other words,the square root of the variance of the Y variable.