MATLAB: An Introduction with Applications
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ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Use the following linear regression equation to answer the questions.
x1 = 1.7 + 3.9x2 – 8.5x3 + 2.2x4
Suppose x2 increased by 2 units. What would be the expected change in x1?
Suppose x2 increased by 4 units. What would be the expected change in x1?
(e) Suppose that n = 18 data points were used to construct the given regression equation and that the standard error for the coefficient of x2 is 0.454. Construct a 99% confidence interval for the coefficient of x2. (Use 2 decimal places.)
| lower limit | ? |
| upper limit | ? |
(f) Using the information of part (e) and level of significance 10%, test the claim that the coefficient of x2 is different from zero. (Use 2 decimal places.)
| t | ? |
| t critical ± | ? |
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