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

                              

RandomRandom

Stratified

Systematic

Cluster

Choose a Region

1-3 Data Collection and Sampling Techniques

Some Sampling Techniques Random – random number generator Systematic – every kth subject Stratified – divide population into “layers” Cluster – use intact groups Convenient – mall surveys

9Bluman 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.