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What is While calculating the incubation period for measles in a group of 25 children, deviation is 2 and the mean incubation period is 8 days. Calculate the standard error - and explain in detail?
STANDARD ERROR OF MEAN (SEMEAN)

SEmean is the measure of difference between sample and population values: Whatever be the sampling procedure or the care taken while selecting sample, the sample estimates (statistics) will differ from population values (parameters)
SE is a ‘measure of chance variation’, and IT DOESNOT mean an error or mistake.