The scatterplot and trend line show a positive correlation between advertising costs and sales.
Which two points can be used to find the slope of the trend line?
Point 1: (5.7,102),(6,116),(6.2,112),(6.4,117)
Point 2: (6.5,122),(6.6,120),(6.7,121),(6.9,123)
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(6.4,117) & (6.6,120) can be used to find slope of trend line for advertising costs and sales. Slope of trend line = 15
Step-by-step explanation:
The scattershot and trend line show a positive correlation between advertising costs and sales.
(6.4,117) & (6.6,120) can be used to find slope of trend line
as both the points lies on trend line
Slope of trend line = (120 - 117) /(6.6 - 6.4)
= 3/0.2
= 15
So on average for every $1000 advertising cost there is increase in sale of $15000
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