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ation Question 31 4 pts QUESTION 31 For each of the following values, is it always positive, always negative, or could be positive or negative? a) F statistic [ Select ] b) Adjusted R2 [ Select ] c) z statistic [ Select ] d) sample mean [ Select ] e) t critical [.Select ] f) p-value [ Select ] g) sample standard deviation [ Select ] h) slope from linear regression [ Select ] [ Select always positive always negative could be positive or negative