x1 = 1.1 + 3.6x2 – 8.2x3 + 1.7x4   1. Suppose that n = 17 data points were used to construct the given regression equation and that the standard error for the coefficient of x2 is 0.328. Construct a 95% confidence interval for the coefficient of x2. (Use 2 decimal places.) lower limit   upper limit   (b) Using the information of part (a) 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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