Calculations based on sample size needed

Sample size needed

If you want to calculate a confidence interval for the population mean with a certain margin of error, you can figure out the sample size you need before you collect any data. The formula for the sample size for

\[\vec{X} \] 

where z* is the standard normal value for the confidence level, MOE is your desired margin of error, and

\[ \vec{X} \]

is the standard deviation

\[n= \left ( \frac {z*\sigma }{MOE} \right )^{2}\]

for calculation let value o f MOF=m

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