Mathematics, 13.01.2021 17:50, barbaragomez27
A National Retail Federation survey found households intend to spend an average of $469 during the December holiday season. Assume that the survey included 600 households and that the sample variance was $375. Calculate the margin of error for a 99% confidence interval.
Answers: 3
level, that is the subtraction of 1 by the confidence interval divided by 2. So:
.
, so 
is the standard deviation(square root of the variance) and n is the size of the sample. In this question, 
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A National Retail Federation survey found households intend to spend an average of $469 during the D...
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