Homework Help: statistics

Posted by looking for someone to varify my work please on Thursday, April 1, 2010 at 10:35pm.

Find the critical value zc necessary to form a confidence interval at the given level of confidence.

a. 90% = 1.645
b. 85% = 1.8025

statistics - MathGuru, Friday, April 2, 2010 at 12:00am
90% is correct!

85% is incorrect. Try again.

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