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When (for what level of confidence) do we use Z = 1.645, for

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When (for what level of confidence) do we use Z = 1.645, for a two-sided test or confidence interval?
a. 90%
b. 95%
c. 80%
d. 100%
Submitted: 4 years ago.
Category: Homework
Expert:  Neo replied 4 years ago.
Good day!

a. 90%

Thank you so much! :)
Customer: replied 4 years ago.
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