ILRstats exam 1 review

# ILRstats exam 1 review - Prelim 1 Review 16:26 Types of...

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Prelim 1 Review 16:26 Types of graphs Scatter plots Box plots Stem and leaf Bar graph/histogram Summary statistics Statistics are an attempt to understand the world through the collection and processing of information Characterizing distributions Normal distribution Unimodal Unimodal and symmetric is what you want to have because approximate distribution well Bimodal, has two humps 68% of data is within 1 standard deviation 95% of data is within 2 standard deviations 99.5% of data is within 3 standard deviations Types of data Quantitative data Is numerical and tells you about the cases Discrete: count data (school size, wildlife pop, # pop w/ tv) Continuous: age, income, weight, volume, distance Categorical Values vary in kind and have no arithmetic mean Nominal: gender, colors, race, religion Ordinal: disease symptoms, self-esteem, letter grade, customer satisfaction Measuring association

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S trength How close the number is to 1 or -1 D irection Positive or negative association F orm Linear
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## This note was uploaded on 04/12/2010 for the course ILRST 2100 at Cornell.

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ILRstats exam 1 review - Prelim 1 Review 16:26 Types of...

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