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if you wanted to use a 70% level to make an interval estimate what Z infinity/2 should you use a. +- 2.59 b. +- 1.04
if you wanted to use a 70% level to make an interval estimate what Z infinity/2 should you use
a. +- 2.59
b. +- 1.04
c. +- 1.645
d. +- 1.28
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