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30 Sample adolescents answer attitude toward dieting bias Calculating Sample chance characteristic e.g. chosen cluster sampling Consider control groups convenience sample dependent variables dieting and exercising difference exists elementary schools employees estimate exclusion criteria Focus groups formula gender goals and aspirations health status High income 30 illustrated in Example inclusion and exclusion infinite number knowledge of health mailed survey mental health services Multistage sampling needs nonresponse normal distribution null hypothesis number of samples older and younger older women participate patients pling probability sampling proportion prostate cancer Quota sampling random numbers reading habits representative Research Questions samphng sample means sampling blueprint sampling error sampling frame Sampling Unit selected simple random sampling smokers Snowball sampling standard deviation standard error statistical Stratified random sampling stratified sampling Students in urban study population subgroup e.g. Survey Objective survey's findings Systematic sampling target population tion Type I error Unit of Analysis younger and older