Question

HELP TO MAKE SURE WORK IS CORRECT PLEASE!!!

An equation was used to predict possible sales of phones for 6 months. The actual sales of phones are also listed.


Actual sales 55 150 325 510 780 990
Predicted sales 40 150 300 500 800 1,000


The sum of the residuals is ______.
Numerical Answers Expected!

Answer 1

(55 + 150 + 325 + 510 + 780 + 990) - (40 + 150 + 300 + 500 + 800 + 1000) = 2810 - 1790 = 20

Answer 2

The sum of the residuals is 80.

Given that, Actual sales 55 150 325 510 780 990.

Predicted sales 40 150 300 500 800 1,000.

What are residuals?

Residual = actual y value − predicted y value. Having a negative residual means that the predicted value is too high, similarly, if you have a positive residual it means that the predicted value was too low.

Thus:

55 - 40 = 15

150 - 150 = 0

325 - 300 = 25

510 - 500 = 10

800 - 780 = 20

1000 - 990 = 10

These add up to be: 15 + 25+ 10 +20 +10= 80

Therefore, the sum of the residuals is 80.

To learn more about residuals visit:

https://brainly.com/question/7467603.

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