Sampling and Pilot Testing

Sampling is defined as
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Terms in this set (30)
Random sampling is generalizable (True or false)trueCluster sampling is used whenit is not possible or feasible to select individualsThe sampling unit is naturally occurring group of individuals includingSchools Classrooms Communities Churches Census tractsStratified sampling is used toensure representativenessSystematic random sampling includesthe Nth name selection technique simplicityStratum includessubset of the population that share at least one common characteristic Gender, race, geographyStratums identified and their _______ within the populationproportionsStratified sampling is ______ sampling within pre-defined stratarandomNon-probability sampling includesmemebers selected in some nonrandom mannerTypes of non-probability sampling includeConvenience Judgement Quota SnowballConvenience Sampling isconvenient and accessible sample inexpensive approximation of the truthJudgement samplingselects sample based on judgementSnowball Samplingused when desired sample characteristics is rare relies on referrals from initial subjects to generate additional subjectsSample size. You should consider...How many people do you need to complete your survey to be able to generalize your findings? Resources , time, personnel Type of sample Prevalence of the characteristics measuring Uncertainty willing to have in estimatesA pilot test isa dress rehearsalA pilot test closely as possible what you plan to doWhat is assessed in a pilot test?1. Sampling 2. Instruments 3. Data collection procedures 4. Data analysis procedures 5. Program curricula/education modules 6. Program support activities 7. Program evaluation proceduresPilot testing steps1. Select or create data collection instrument. 2. Determine data collection method 3. Determine data collection procedures 4. Determine data analyses prodecures 5.Conduct the pilot test 6. Evaluate the overall performance 7. Make revision as neededPotential Data Collection Problems include1. Difficulty with directions 2. Difficulty with questions 3. Difficulty with answer sheets 4. Difficulty with data collection procedures 5. Difficulty with processing completed questionnaires 6. Difficulty with processing completed questionnaires 7. Difficulty with data analyses 8. TimeIs a pilot study necessary?1. Pilot test allow for an initial testing of hypothesis or ideas, enabling the investigator to refine hypothesis or ideas for the main study. 2. Pilot tests produce information information investigators may not have initially considered. This new information may help investigators expand or reduce the scope of their studies or programs. 3. Pilot test enable investigators to appraise data collection and statistical analysis procedures. 4. Pilot test reduce problems with the intervention because they uncover problems early so there is time to correct them. 5. Pilot tests help investigators decided if it is worthwhile to conduct the proposed main study; pilot studies may reveal that proposed designed are not accomplishing the goals of the project. 6. Pilot tests provide investigators with feedback about subjects which can help improve the intervention or any aspects of it