Section 1-3 Data Collection and Sampling Techniques

Objective 5: Identify the FIVE Basic Sampling Techniques There are many methods of sampling. In this unit we will study 5 of those techniques. In the past year have you ever seen or participated in any type of survey?

Sampling Methods Random Systematic Stratified convenient Cluster See page 10

Random Random

Stratified

Systematic

Cluster Choose a Region

1-3 Data Collection and Sampling Techniques Some Sampling Techniques Random Random – random number generator Systematic Systematic – every k th subject Stratified Stratified – divide population into “layers” Cluster Cluster – use intact groups Convenient Convenient – mall surveys 9 Bluman Chapter 1

Convenience Sampling Does high IQ equal longer life? A study of 1.1 million people conducted by a team of health experts found out that a person with a high IQ has a lower chance of dying at any given time than those with a lower IQ score. Because the researchers were interested whether there was some sort of correlation between IQ and unintentional injury, they primarily tracked mortality in groups of former Swedish soldiers who had to take detailed IQ tests.

Homework Make sure to study: – all the terms discussed in class. –the terms that are in bold print in section 1-3. –Any definition in green boxes in section 1-3. Section 1-3 Applying Concepts page 13; make sure to answer all questions.