• Standard error is a measurement which determines the accuracy of results according to 95% confidence.

SD= standard Deviation

n = sample size

  • It is calculated by dividing the Standard Deviation of the mean by the square root of the sample size
  • The 95% confidence interval allows the results to have:
  • The true mean value of the results from which the sample was taken lies between the upper and lower confidence limit
  • If the intervals of two calculated means do not overlap, then the results are 95% confident that these means are different