Graph the points from 1998 through 2005 on a scatter

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A store wishes to predict net profit as a function of sales for the next year. The following table gives the years 1998 to 2005.

Year

Sales

(thousands of dollars)

Net Profit

1998

51

7

1999

55

9.2

2000

65

9.6

2001

82

-3

2002

75

2.5

2003

71

3.2

2004

82

-2.3

2005

81

-2.6

(a) Graph the points from 1998 through 2005 on a scatter diagram using Sales as the independent variable and Net Profit as the dependent variable.

(b) Draw the regression line on the graph you constructed in Part (a).

(c) What is the value of the coefficient of determination for this regression model? Comment on the strength of the regression line for this model.

(d) What is the predicted net profit for 2006 if sales are expected to be 105?

Reference no: EM13582015

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