This formula is used to compute the average of the data collected. An estimate of the population mean is the sample mean. In case it is too small it will not yield valid results while a sample is too large may be a waste of both money and time.
Formula for Z score is given below.
This formula is used to compute the average of the data collected. Even if it doesnt have a normal distribution or the distribution is not known you can find probabilities if the sample size n is large enough. An estimate of the population mean is the sample mean. By Staff Writer Last Updated Mar 31 2020 113307 PM ET.