Which of the following would be an appropriate null hypothesis for the one-sample t test of the hypothesis that the mean reaction time of a population of 45 year-old drivers is 0.653 seconds?
a. H0: 653 . 0 = X
b. H0: 653 . 0 ? X
c. H0: ? = 0.653
d. H0 :? ?0.653
C
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