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Types of Control

Types of Control. I. Measurement 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.

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Types of Control

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

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

  3. 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)

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

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

  6. 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

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

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

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