how do you find the standard error of the sample mean
Standard error Therefore, the relationship between the standard error and the standard deviation is such that, for a given sample size, the standard error equals the standard deviation divided by the square root of the sample size. In other words, the standard error of the mean is a measure of the dispersion of sample means around the population mean.
Random glucose test The reference values for a "normal" random glucose test in an average adult are 79–160 mg/dl (4.4–7.8 mmol/l), between 160–200 mg/dl is considered pre-diabetes, and > 200 mg/dl is considered diabetes according to ADA guidelines (you should visit your doctor or a clinic for additional tests however as a random glucose of > 200 mg/dl does not necessarily mean you are diabetic).[citation needed]