Determining Sample Size & the Standard Deviation (S)

The standard deviation (the degree of variability in the population for a population mean) may be estimated as follows:

Use of subjective judgement

Similar study carried out in the past - use the standard

deviation obtained from the study.

Pilot study (eg. Cigarette freq.; scheme participation) Sequential sampling

s= max value - min value (assume largest difference +/- stan.dev)

6 ( max/min parameter values are known)

(rule of the thumb - calculated as one-sixth of the range)

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