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Determination of Sample Size: A Review of Statistical Theory

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Presentation on theme: "Determination of Sample Size: A Review of Statistical Theory"— Presentation transcript:

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

2 Sample v. Population Inferential Descriptive Sample statistics
Population parameters

3 Tables Frequency distribution Percentage distribution Probability
Proportion

4 Measures of Central Tendency
Mean Median Mode

5 Measures of Dispersion
Range Formula Deviation (Variance) Standard Deviation

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

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

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

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

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

11 Sample Size for Means Formula Question #11 page 343

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

13


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