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Chapter 7 - Analysing the Data Part IV - Analysis of Variance Chapter 1 - Behavioural Science and research Chapter 2 - Research Design Chapter 3 - Collecting the Data Chapter 4 - Analysing the Data Part I - Descriptive Statistics Chapter 5 - Analysing the Data Part II - Inferential Statistics Chapter 6 - Analysing the Data Part III - Common Statistical Tests Sources of data Samples and populations Sampling methods Quantitative and qualitative approaches Questionnaire design Coding of data Readings and links


Chapter 3: Collecting the Data


Sampling methods

Ray Chapter 13 discusses several different types of sampling methods including convenience sampling, stratified sampling, quota, and snowball sampling. The ideal is random sampling but this is usually impractical. The various methods described in Ray are usually applicable to non-experimental survey-based research.

Random assignment in experimental designs is sufficient to allow the inference of causation (assuming all other confounding variables have been controlled).




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