STATS Quiz 1

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23 Terms

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Statistics

The theory of decision making

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Data

Observations

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Population

All individuals of interest

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Parameter

Numerical characteristic of a population

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Sample

Subset of the population

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A statistic

Numerical characteristic of a sample

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Two types of data

Quantitative (numerical) and Qualitative (categorical)

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Discrete (Quantitative data)

finite or countably infinite # of possibilities

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Continuous (Quantitative data)

Uncountably infinite # of possibilities

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Nominal (level of measurement)

Qualitative, no math can be done

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Ordinal (level of measurement)

Qualitative, can be ranked but differences meaningless

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Interval (level of measurement)

Quantitative, can be ranked, differences meaningful, 0 is not inherent

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Ratio (level of measurement)

Quantitative , can be ranked, differences meaningful, 0 is inherent

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Simple Random Sample (SRS)

Every sample of the same size n has the same chance of selection

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Stratified Sample

Break population into homogeneous groups and take a SRS from each group proportionally

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Systematic Sample

Take every kth person

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Cluster sample

Take entire subgroups

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Mean and s

Any points outside mean+-3s

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5# Summary

Min, max, Q1, M, Q3

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Density Histogram

height=fraction Ă·bin width