Determination of Sample Size: A Review of Statistical Theory

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)
• Formula
• Standard Deviation
• Formula

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

• Population µ o
• 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
• Question 12 page 343

12
Sample Size for Proportions

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

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