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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.

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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