Television ads
the following data was collected in past years to try to determine how tv ads
affect cd sales. plot the points and estimate the line of best fit.
number increase in
of tv cd sales
ads
0
725
250
900
450
400
ununu
increase in cd sales
100 200 300 400 500 600 700 800 900 1000
750
600
350
575
450
700
150
325
950
0
6
0
1
2
7
8
9
10
3 4 5 6
number of tv ads
use the points (1, 150) and (6, 900) to estimate the line of best fit.
1. graph the line that goes through both given points above.
needed info:
2. find the slope of the line.
y=mx+b
slope formula
y-y,
= m
3. write the equation of the line.
x
-x,
4. what does the slope tell you about how each tv ad affects sales?
for every tv ad, cd sales increased by about