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SAMPLING METHODS AND RESEARCH DESIGNS

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SAMPLING METHODS AND RESEARCH DESIGNSChapter 4TOPICSLIDETypesof Research2Lurkingand Confounding Variables8Whatare Subjects?10Whatis a Sample?15SamplingMethods17SystematicBias 23RandomAssignment24ExperimenterBias25Do uble-BlindMethod26Research Designs29TYPES OF RESEARCHChapter 4 Observational studies EXAMPLES: Collecting the sale price for existing homes SAMPLING gas prices from 50 local gas stations Counting the number of drivers not wearing seatbelts at a busy intersection True experiments EXAMPLES: Testing the effect of a new sleep-aid medication Comparing HEAD start to traditional education methodsTYPES OF RESEARCHChapter 4 Observational studies The researcher is only observing and collecting data No variables ( , IV) are manipulated by the researcher Data is collected to describe: Characteristics of a variable for a sample or population EXAMPLE:Mode, median, mean, and sta

Stratified Random Sampling: A specific number of students would be randomly selected from each high school in NM Unlike Cluster Sampling, this method ensures that every high school in NM is represented in the study. SAMPLING METHODS Chapter 4

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