Question

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

20

Explanation:

The sum of (actual - predicted) is ...

{55, 150, 325, 510, 780, 990} - {40, 150, 300, 500, 800, 1,000}

= total({15, 0, 25, 10, -20, -10}) = 20

The sum of residuals is 20.