Linear Regression. Calculate r (the correlation coefficient), m, b, and as follows:
1.Clear the statistical registers by pressing \t.
2.Enter the first
3.Enter the corresponding
4.Continue entering x,y pairs. The
5.To display r, the correlation coefficient, press \Z\«.
6.To display m, the slope, press \W\«.
7.To display b (the
Linear Estimation. The straight line calculated by linear regression can be used to estimate a
1.Enter the x,y data.
2.Enter the known
•To estimate x for the given y, enter the
•To estimate y for the given x, enter the
Example: 4
Ali’s Azaleas advertises on a local radio station. For the past six weeks, the manager has kept records of the number of minutes of advertising that were purchased, and the sales for that week.
Table
Week | Minutes of Advertising | Sales | |
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1 | 2 | 1,400 | |
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2 | 1 | 920 | |
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3 | 3 | 1,100 | |
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4 | 5 | 2,265 | |
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5 | 5 | 2,890 | |
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6 | 4 | 2,200 | |
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What is the
122 Statistical Calculations