Answer:
Explanation:
To calculate the slop from this question. Please find attached diagram that will aid us to that will assist us in solving this question.
= ∑ − (∑ ) (∑ ) / /∑ ² − (∑ )² /
=5117 − 287 ∙ 141 /8 / 10371 − 287²/8
=58.625 /74.875
=0.7830.
To calculate the y-intercept
= ∑ / − ∙ ∑ / = 141 /8 − 0.783 ∙ 287 /8 = −10.4651.
Therefore;
Sales = −10.4651 + 0.7830 ∙ Advertising.
Sales (40) = −10.4651 + 0.7830 ∙ 40 = $20.85 Million.