Types of Control I. Measurement Control II. Statistical Control

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Presentation transcript:

Types of Control I. Measurement Control II. Statistical Control (Reliability and Validity) II. Statistical Control (External Validity) III. Experimental Control (Internal Validity)

Statistical Control - Sampling I The Vocabulary of Sampling II Types of Samples III Determining Sample Size

Statistical Control - Sampling I. The Vocabulary of Sampling A. The Universe (The Theoretical Concept) B. The Population (The Indicator Concept) C. The Sampling Frame (The Operational Procedure) D. The Sample (The Observational Set)

Statistical Control - Sampling II. Types of Samples A. Non-Probability B. Probability

Statistical Control - Sampling II. Types of Samples A. Non-Probability (Good for Exploratory Research) 1. Convenience Sampling 2. Referral Sampling 3. Quota Sampling

Statistical Control - Sampling II. Types of Samples B. Probability (Good for Explanatory Research) 1. Simple Random Sample 2. Systematic Random Sample 3. Stratified Random Sample 4. Cluster or Area Sample

Statistical Control - Sampling IV. Sample Size A. Error in Prediction (Three Components) A. Error in Prediction B. Confidence Level C. Variability in Population

Determining Sample Size Consider the confidence interval Solving for the sample size N we get If Then Observe now the three parentheses that define N: 1) our confidence level (z); 2) the population variance; and 3) the margin of error.