7.8 Each of the following pairs represents the number of licensed drivers (X ) and the number of cars (Y ) for seven houses in my neighborhood:
DRIVERS (X ) CARS (Y )
5 4
5 3
2 2
2 2
3 2
1 1
2 2
(a) Construct a scatterplot to verify a lack of pronounced curvilinearity.
(b) Determine the least squares equation for these data. (Remember, you will first have
to calculate r, SSy and SSx)
(c) Determine the standard error of estimate, sy|x, given that n = 7.
(d) Predict the number of cars for each of two new families with two and five drivers.
7.9 At