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OpenStudy (anonymous):
If a confidence level of 90% is used to construct a confidence interval for the mean mew(u) of a normal population when the value of the standard deviation s is known, the z critical value is
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jimthompson5910 (jim_thompson5910):
are you supposed to tables or can you use a calculator?
OpenStudy (anonymous):
is it 1.645?
jimthompson5910 (jim_thompson5910):
yes it is, nice job
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