(Answered) A a simple regression tc a bq is unable to explain 19

Economics

A. A simple regression TC = a + bQ is unable to explain 19 percent of the variation in total costs. What is the coefficient of correlation between TC and Q?

B. In a regression-based estimate of a demand function, the b coefficient for advertising equals 3.75 with a standard deviation of 1.25 units. What is the range within which there can be 99 percent confidence that the actual parameter for advertising can be found?

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