# Least squares regression line

Please help with the following sales and advertising question.

1. Regression analysis was applied between sales in ($1000) and advertising(in $100), and the following regression function was obtained: Y = 61 +4.1X Based on this regression line, if advertising is $10,000, the point estimate for sales (in dollars) is what?

2. How do we use a least squares regression line? Please explain in your own words.

3. What is the range for the coefficient of determination? Please explain in your own words.

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#### Solution Preview

Please see the answers.

1. Regression analysis was applied between sales in ($1000) and advertising(in $100), and the following regression function was obtained: Y = 61 +4.1X Based on this regression line, if advertising is $10,000, the point estimate for sales (in dollars) is what

When advertising =$10000

The sales can be estimated ...

#### Solution Summary

This solution provides a step by step method for computing least squares regression line. The posting helps with point estimates, a least squares regression line and the range of the coefficient of determination.