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### 12-1 Sampling and Bias

Drill #81

Find the equation of the line passing through the following point with the given slope:

(-4, -3), m = ¾

1. Point- Slope Form

2. Slope Intercept Form

3. Standard Form

Objective: To identify various sampling techniques, and to recognize a biased sample.

Open books to page 642.

(1.) Sample, (2.) Population, and (3.) Random Sample **

Sample: Some portion of a larger group

Population: The group from which a sample is chosen.

Random Sample: A sample that is chosen without any preference, usually representative of an entire population.

(4.) Stratified and (5.) Systematic Random Sample **

Stratified Random Sample: A sample is chosen after the population is divided into similar non-overlapping groups.

Systematic Random Sample: Items are selected according to a specified time or item interval. (assembly line)

Classify a Random Sample

Example 1a, b: page 642

Check Your Progress 1A, 1B

CLASSWORK:

12-1 Study Guide, #1-4

(6.) Biased Sample **

Definition: a sample in which one or more parts of the population are favored over others.

(7.) Convenience and (8.) Voluntary Response Sample **

Convenience Sample: A sample in which members of a population are chosen who are easily accessed.

Voluntary Response Sample: Involves only those who want to participate in the sampling.

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