a) Suppose that n = 10 data points were used to construct the given regression equation and that the standard error for the coefficient of x4 is 0.882. Construct a 90% confidence interval for the coefficient of x4. (Round your answers to two decimal places.) lower limit = ______ upper limit = ______   b) Using the information of part (e) and level of significance 1%, test the claim that the coefficient of x4 is different from zero. (Round your answers to three decimal places.) t= ____ t critical=  __

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