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pickupchik [31]
3 years ago
6

A regression model is used to forecast sales based on advertising dollars spent. The regression line is y=500+35x and the coeffi

cient of determination is .90. Which is the best statement about this forecasting model?
Mathematics
1 answer:
Nataliya [291]3 years ago
3 0

Answer:

The correlation between sales and advertising is positive.

Step-by-step explanation:

INCORRECT. For every $1 spent on advertising, sales increase by $35.

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<u>Step-by-step explanation:</u>

Here we have , A manufacturer finds that the revenue generated by selling of cortan commodity is given by function R(x)=80x-0.2x^ 2 , where he maximum reveremany should be manufactured to obtain this maximum units .Let's find out:

We have following function as R(x)=80x-0.2x^ 2 . Let's differentiate this and equate it to zero to find value of x for which the function is maximum!

⇒ R(x)=80x-0.2x^ 2

⇒ \frac{d(R(x))}{dx}=\frac{d(80x-0.2x^ 2)}{dx}

⇒ \frac{d(R(x))}{dx}=\frac{d(80x)}{dx}-\frac{d(0.2x^ 2)}{dx}}

⇒ 0=80-2x(0.2)

⇒ \frac{80}{0.4}=x

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Now , Value of function at x=200 is :

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⇒ R(200)=16000-8000

⇒ R(200)=8000

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