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| Using data from the past 20 quarters, Brent calculates the t-statistic for marketing expenditures to be 3.68 and the t-statistic for salespeople at 2.19. At a 5% significance level, the two-tailed critical values are tc = +/- 2.127. This most likely indicates that: A. the t-statistic has 18 degrees of freedom. B. both independent variables are statistically significant. C. the null hypothesis should not be rejected. |