1. M3U8D1 Warm-up:
1. Let’s gather data about how our school population feels about introducing “smart lunch” on campus. Think of three ways we could gather information to make an informed decision on whether students feel that this would be beneficial or not.
Student answers will vary.
2. A local newspaper ran a survey by asking, “Do you support the development of a weapon that could kill millions of innocent people?” Determine whether the survey question is biased and why.
It’s hard to agree with something when you’re told it’s going to kill millions of people – this question is biased. Chances are the results will under represent those who may believe the development of the weapon is a good thing.

2. M3U8D1 Sampling Objective:
Identify sampling types that can be used across different sampling methods.

3. There are three ways to collect data: 1. Observational Studies:
A study in which a researcher simply observes behavior in a systematic manner without influencing or interfering with the behavior.
2. Experiments:
A study in which all of the factors are under the direct control of the investigator.
3. Surveys:
A study about the characteristics of a given population by means of collecting data from a sample of that population.
Experiment or Observational Study?
1. Fifty people with clinical depression were divided into two groups. Over a 6 month period, one group was given a traditional treatment for depression while the other group was given a new drug. The people were evaluated at the end of the period to determine whether their depression had improved.
2. To determine whether or not apples really do keep the doctor away, forty patients at a doctor’s office were asked to report how often they came to the doctor and the number of apples they had eaten recently.
3. To determine whether music really helped students’ scores on a test, a teacher who taught two U. S. History classes played classical music during testing for one class and played no music during testing for the other class.
Experimental
Observational
Experimental

4. Identify a Random Sample Video
Identify a Representative Sample
Generate a Representative Sample
Understanding Biased Samples

5. Modeling Sampling Techniques
Class Activity:
Modeling Sampling Techniques
Simple Random
Convenience
Cluster
Stratified Random
Systematic Random

6. M3U8D1 A Sample of Sampling Methods WS pp. 2
Homework:
M3U8D1 A Sample of Sampling Methods WS pp. 2