Interviews

Interview Advantages

Interview Disadvantages

Questionnaires

Questionnaire Advantages

Questionnaire Disadvantages

Response Rate

Techniques to increase response rate

Sampling Terminology

Population

Census

Sampling

Sample

Sampling Frame

Representative Sample

Ways to Sample

Probability sampling

Simple random sampling

Systematic random sampling

Stratified Sampling

Sampling Bias

Sampling Bias

Non-probability Sampling

Non-probability Sampling

Snowball sampling

Non-Probability Sampling

Convenience/Volunteer samples

Non-Probability Sampling

Purposive Sampling (judgmental)

I have the sample and collected my data.
What do I do now???

Raw Data

Frequency Distributions

Bar Chart

Grouped Frequency Distributions

Histogram

Frequency Curve

Descriptive Statistics

Central tendency

Dispersion

Measures of Central Tendency
The Mean

-Arithmetic mean-

Measures of Central Tendency
The Median

Measures of Central Tendency
The Mode

Distribution

Shapes of Distributions

Skewed (NOT Normal) Distributions

-Outliers-

Skewed

Shapes of Distributions

Measures of Dispersion

Dispersion (‘the spread’)

Range

The Standard Deviation

Standard Deviation and the Normal Curve

Sample Size and the Margin of Error

Sample Size and the Margin of Error