If you wish to estimate a population mean with a margin of error MEequals=0.33
using a 95% confidence interval and you know from prior sampling that σ2
is approximately equal to 4.6 how many observations would have to be included in your sample?
The number of observations that would have to be included in your sample is (______) (Round up to the nearest observation.)
Answer
We have variance = 4.6
first, we need to find standard deviation
standard deviation =
Margin of error = ME = 0.33
We have to find sample size using 95% confidence interval, so z score = 1.96 (using z distributiont table)
Formula for the sample size is given as
n =
setting the given values, we get
Rounding it off to next whole number, we get
sample size n = 162
If you wish to estimate a population mean with a margin of error MEequals=0.33 using a...
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