## Stats Chapter 1

Last update by gfair09 on 01/26/2010
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# Explain the Process of Statistics

1. Identify the research objective.
2. Collect the data needed to answer the questions posed.
3. Describe the data.
4. Perform inference.

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Compare Population, Sample, and Induvidual

Population is the entire group of induviduals to be studied.
Sample is a subset of the population that is being studied.
Induvidual is a person or object that is a member of the pop.
• Answered in Stats Chapter 1
Statistic -v- Parameter
Numerical summary of a sample; numerical summary of a population.
• Answered in Stats Chapter 1
Descriptive Statistic -v- Inferential Statistic
Organizing and summarizing data (1. numerical summaries, 2. tables, 3. graphs, 4. formulas); taking results from a sample and applying it to the entire population.
• Answered in Stats Chapter 1
Variables
Characteristics of the individuals within the population.
• Answered in Stats Chapter 1

Qualitative -v- Quantitative

Categorical, classification based on attributes or characteristics; provide numerical measures or individuals.
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2 Types of Quantitative Variables
Discrete: finite number of values or countable; Continuous: infinite number of values, measureable.
• Answered in Stats Chapter 1
4 Types of Data

1. Quantitative 2. Qualitative 3. Discrete 4. Continuous

• Answered in Stats Chapter 1
List 4 Levels of Measurement
1. Nominal 2. Ordinal 3. Interval 4. Ratio
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Observational Study -v- Designed Experiments
Does not effect induviduals -v- intentionally effects individuals
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Response Variable -v- Explanatory Variable

The Explanatory variable affects the value of the response variable; response variable = the end result.

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Confounding

Occurs when the effects of two or more explanatory variables are not separated

Stats Chapter 1
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