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Use the following linear regression equation to answer the questions. x3 = −16.9 + 3.9x1 +...

Use the following linear regression equation to answer the questions.

x3 = −16.9 + 3.9x1 + 9.8x4 − 1.9x7

(e) Suppose that n = 19 data points were used to construct the given regression equation and that the standard error for the coefficient of x4 is 0.883. Construct a 90% confidence interval for the coefficient of x4. (Round your answers to two decimal places.)

lower limit      ?
upper limit ?


(f) Using the information of part (e) and level of significance 5%, test the claim that the coefficient of x4 is different from zero. (Round your answers to two decimal places.)

t = ?
t critical = ± ?
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