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Regression analysis and correlation

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Problem:

A sales manager for an advertising agency believes there is a relationship between the number of contacts and the amount of sales. To verify this belief, the following data were collected:

(SEE ATTACHED DATA FOR THIS PROBLEM-thanks)

(a) Create a scatter diagram. Put the independent variable on the X (horizontal) axis and put the dependent variable on the Y (Vertical) axis. Be sure to label the axes.

(b) Determine the regression equation. State what the y intercept is and what the slope of the linear equation is. Does this appear to be a good model?

(c) What is the value of the correlation coefficient, and what is the value of the coefficient of determination?

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This posting provides analysis of advertising agency data using correlation and regreession analysis

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