Transcription of SAMPLING METHODS AND RESEARCH DESIGNS
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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 EXAMPLE:Mode, median, mean, and standard deviation How much two or more variables have in common EXAMPLE.
TYPES OF RESEARCH Chapter 4 Well designed experiments attempt to remove the effects of any lurking and possibly confounding variables • A lurking variable is a variable not accounted for by the researcher • These variables may or may not contaminate the results of the study • A lurking variable that interacts with the IV and DV is
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