Lecture06

# Lecture06 - Assignment After this lecture start...

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Chapter 11 – 1 Assignment After this lecture, start Assignment #3. It’s in the course binder.

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Chapter 11 – 2 Lecture 6 Who are we talking about? Populations and samples
Chapter 11 – 3 Overview Defining a population Taking a simple random sample How similar is the sample to the population?

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Chapter 11 – 4 Population and Samples Population All the cases (individuals, objects, or groups) in which the researcher is interested. Sample A relatively small subset from a population. Example The US population: ~300 million people The General Social Survey (GSS): a sample of the US population about 3,000 people Student version of the GSS: a sample from the GSS about 1,500 people
Chapter 11 – 5 The sampling problem We care about populations . We can only afford to look at samples . How do we know our sample is relevant?

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Chapter 11 – 6 Simple random sampling: Definition Define the population label every person Sample the labels randomly so everyone in the population has the same probability of being sampled
Chapter 11 – 7 Simple random sampling: Example Define the population: this class=52 people label every person: Give everyone a playing card Sample the labels: Draw 5 cards from a second deck randomly: after shuffling so everyone in the population has the same probability of being sampled: Everyone’s card appears once in the deck.

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Chapter 11 – 8 Sampling: Bad examples Define the population: This class=52 people label every person: Put everyone in a seat Sample the labels: Choose 5 people from first row.
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Lecture06 - Assignment After this lecture start...

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