Sample size and statistical precision
James Dean Brown · 2007
QUESTION: One topic I think many people would be interested in is something about sampling sizes and calculating sampling errors. It seems many teachers just randomly select a number between 20 50 when determining the size of their samples without knowing why (or how) a sample size for a survey should estimate – or how to calculate the error of measurement that is probably due to sampling error. Since most of the research studies language teachers conduct involve small samples, some information about calculating sampling errors is probably needed.