Cheat Sheet Basic Statistics Formulas. 2 2 2 2. Z is the critical value for the confidence level you need.
1 population standard deviation. To find the sample size needed to estimate a population mean or a population proportion p use the following formula. Where z is the critical value for the confidence level you need.
In this formula moe represents the desired margin of error which you set ahead of time and σ represents the population standard deviation.
These formulas reference include the basic functions of mean mode median sample size variance standard deviation standard error z score margin of error confidence interval covariance correlation coefficient probability regression permutations combinations normal distribution binomial distribution poisson distribution exponential distribution uniform distribution triangular distribution gamma distribution weibull distribution normal distribution f distribution t. 2 2 2 2. In this formula moe represents the desired margin of error which you set ahead of time and σ represents the population standard deviation. Z is the critical value for the confidence level you need.
