If I know the mean and ÓX, how do I find n ?
To find the value of n (sample size) when you know the mean (µ) and standard deviation (σ) of a population, you'll need to use the formula for the standard error of the mean. The formula is:
Standard Error of the Mean (SE) = σ / √n
To find n, you need to rearrange the formula to solve for it:
n = (σ / SE)²
where σ is the standard deviation of the population, SE is the standard error of the mean, and n is the sample size.
Therefore, to find n, you will also need to know the standard error of the mean (SE). If you don't know this value, you can calculate it using the formula:
SE = σ / √n
Once you have the standard error of the mean, you can substitute it into the formula above to find the sample size (n).