Question

Explore making predictions from a scatterplot.

The store Clothes-4-You keeps data on their sales. These data points represent their coat sales, where x is the average outside temperature and y is the number of coats sold.

(3, 94), (12, 91), (16, 83), (21, 93), (27, 82), (29, 69), (40, 71), (43, 63), (60, 38), (52, 53)

What is the best estimate for the number of coats sold when the outside temperature is 35°F?

Answer 1

Fit a least-squares line to the data. The regression line is

y ≈ 102.80 − 0.9605 x.

At x = 35°F the predicted coats sold is

y ≈ 102.80 − 0.9605(35) ≈ 69.2,

so about 69 coats.