You collect a sample of twenty pairs of yearly sales in 2000 and 2005. You hypothesize that yearly sales have decreased between 2000 and 2005. If x ?D = -99.6 and sD = 160.60, what is the critical value of t if ?= .05?

a. -1.729
b. -2.093
c. 1.725
d. 1.086


a. -1.729

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