The absolute values of the critical values in a two-tailed confidence interval are the same because ______.
A. the normal curve is a bimodal distribution, with each modal category having similar standard errors
B. the normal curve is symmetrical, and the z values in each half are identical to one another
C. the z distribution is a bimodal construct with one mode positive and the other negative
D. the absolute values of the critical values in a two-tailed confidence interval are not the same, this is a trick question.
B. the normal curve is symmetrical, and the z values in each half are identical to one another
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