4.1 Which of the following is a true statement?
(A) An F test statistic can be either negative or positive.
(B) A χ2 test statistic can be either negative or positive.
(C) A t test statistic can be either negative or positive.
(D) Multiple regression is used when both x and y are categorical.
(E) If a 95% confidence interval for μ1 − μ2 contains zero, then we would reject the hypothesis H0 : μ1 = μ2 at the 0.05 significance level.
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