Question

Which equation best models the data in the scatter plot?
http://www.intervisualtechnology.us/data/1/12970/u8l6q5.JPG
A) y = 15
B) y = (-½)x + 26
C) y = (-⅖)x + 19
D) y = (-⅘)x + 33
Please help I am so confused? Thanks

Answer 1

use an online linear regression tool like: http://www.alcula.com/calculators/statistics/linear-regression/

Answer 2

Just look at the graph you have been given, each point has an x and y value.
go to the x axis note the x-value of the point, and then go to the y axis, and note its you value.

Example:

Answer 3

Enter the x and y values into the online linear regression tool and you will get your answer

Answer 4

here, I have filled in all the x and y coordinates for you to enter:
if it is small just expand it:

Answer 5

here is the data I entered:

Answer 6

And here is the result I got:

Answer 7

From the results, the equation of the line of best fit is approximately:
y=26 - 0.49 x

Answer 8

Rearranging this we get:
y= -0.49x + 26
which basically correspond to option B.
Answer = B

Answer 9

Thank You!