Question 1035065
Margin of Error (half of confidence interval) 14
The margin of error is defined as the "radius" (or half the width) of a confidence interval for a particular statistic.
Level of Confidence 80
s = Sample standard deviation 140
'z critical value' from Look-up Table for 80% 1.28
significant digits 2
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n = (1.28*140/14)^2
n = Sample Size 163.84 = 164