Mean Plus Minus 2 Standard Deviation. Again there is a. 1 either the mean plus minus a coefficient 2 2 5 or 3 times the standard deviation or the interquartile method a commonly used method to detect outliers see for example rousseeuw croux 1993 or another method e.
Enter your numbers below the answer is calculated live. For the serum triglyceride data s 0 04802 0 22 mmol litre. Where the mean is bigger than the median the distribution is positively skewed.
The mean and median are 10 29 and 2 respectively for the original data with a standard deviation of 20 22.
The dotted lines are drawn at the mean plus or minus two standard deviations and about 95 of the values lie within those limits. For the logged data the mean and median are 1 24 and 1 10 respectively indicating that the logged data have a more symmetrical distribution. Where the mean is bigger than the median the distribution is positively skewed. The plus minus sign also plus or minus sign is a mathematical symbol with multiple meanings.
