Determination of Sample Size: A Review of Statistical Theory

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Presentation transcript:

Determination of Sample Size: A Review of Statistical Theory Chapter 13

Sample v. Population Inferential Descriptive Sample statistics Population parameters

Tables Frequency distribution Percentage distribution Probability Proportion

Measures of Central Tendency Mean Median Mode

Measures of Dispersion Range Formula Deviation (Variance) Standard Deviation

The Normal Distribution Three Characteristics Standardized Normal Distribution Why do I have to know this? What does it mean? Variable Formula Example

Population Distribution, Sample Distribution, and Sampling Distribution Sample: S Sampling Distribution Standard Error of the Mean Symbol Formula

Central Limit Theorem As sample size increases, the distribution of the mean, of any sample approaches a normal distribution.

Estimation of Parameters Point Estimates What is it? Confidence Intervals Question #10, page 343

Sample Size for Means Sample Error Formula Factors Variance Magnitude of error (confidence interval) Confidence level

Sample Size for Means Formula Question #11 page 343

Sample Size for Proportions Standard Error for Proportion Formula Confidence interval Sample Size