Mathematics, 02.04.2021 01:00, rpmgamer
We are formulating a 90% confidence interval for the population mean and would like our confidence interval to have a margin of error that is not larger than 3. Experience suggests that a reasonable estimate for the population standard deviation is 15. What minimum sample size should be anticipate using? (NOTE: Round your final answer up to the next whole number).
Answers: 2
level, that is the subtraction of 1 by the confidence interval divided by 2. So:
.
, so Z = 1.645.
is the standard deviation of the population and n is the size of the sample.
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