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class - Sampling and Research Techniques

class - Sampling and Research Techniques - b Longitudinal...

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1.14.3 Class Notes – Sampling and Research Techniques I) Sampling Technique a. Basic Types i. Non-probability Sampling – when the researcher doesn’t know the probability of someone being selected for their experiment 1. Haphazard – get whoever you can (convenience sample) 2. Quota - ? ii. Probability Sample – researcher does know the probability that someone will be selected 1. Simple Random Sampling – randomly selecting people from the population 2. Cluster Sampling – break population into chunks and then randomly select people from those chunks II) Longitudinal vs. Cross-Sectional Research a. Cross-Sectional Studies – assessing people in divisions of age ranges (some number of different age groups) then administer same measure and look at the differences between age groups
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Unformatted text preview: b. Longitudinal Studies – reveal change over time by testing a group of same aged peope time and time again as they get older. c. Cross-Sequential Studies – start out with a cross-sectional study but then take back those people and test them again and again like longitudinal studies III) Descriptive Studies a. Advantages: i. Useful in beginning of research to formulate a good experiment to test theories ii. Good in helping to understand naturally occurring behavior iii. Flexible - ? b. Disadvantages i. Can’t infer how variables are related ii. Data might be problematic, not easy to replicate (due to confounds) iii. May be difficult to maintain an objective standpoint on the part of the experimenter (Experimental Bias)...
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