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SAMPLING METHODS AND RESEARCH DESIGNS

SAMPLING METHODS AND RESEARCH DESIGNSC hapter 4 TOPICSLIDET ypesof Research2 Lurkingand Confounding Variables8 Whatare Subjects?10 Whatis a Sample?15 SamplingMethods17 SystematicBias23 RandomAssignment24 ExperimenterBias25 Double-BlindMethod26 RESEARCH Designs29 TYPES OF RESEARCHC hapter 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 RESEARCHC hapter 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

TYPES OF RESEARCH Chapter 4 Observational studies involve describing what was observed, whereas experiments often attempt to identify a cause-and-effect relationship

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