13+Descriptive+Statistics

# 13+Descriptive+Statistics - Statistics Or how I learned to...

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Introduction to Descriptive  Statistics  Or how I learned to conquer math anxiety and embrace all that is righteous and good about numbers Ron Sandwina, PhD Communication Studies Department IUPUI

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It’s boring…………

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Has lots of numbers and funny  symbols…. Mean μ x Variance σ Sigma Squared Std. Dev. Sigma s Correlation ρ r ANOVA ANACOVA MANOVA ANNA KOURNICOVA 2 2 E ) p 1 ( p z n - =
Statistics are evil! People lie with  statistics. There are lies-- There are damn lies-- And there are statistics Benjamin Disraeli, British Prime Minister

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Homer Simpson does not like  them…
From a Simpsons episode : Homer is questioned about his newly formed vigilante group Newscaster: Since your group started up, petty crime is down 20%, but other crimes are up, such as heavy sack beating which is up 800%. So you’re actually increasing crime. Homer: You can make up statistics to prove anything. 43% of people know that.

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So, what are statistics? “Statistics describes a set of tools and techniques that is used for describing, organizing, and interpreting information or data” (Salkind, p. 8, 2004).
Uses of Statistics Statistics are used to make general statements about a sample or population. Statistics DO NOT help us understand the individual experiences of one person. Statistics are used to reach conclusions about the differences between groups. Statistics are used to determine if variables are related to each other

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Definitions Population: The entire collection of individuals or objects about which information is desired. Sample: A part (subset) of the population selected in some prescribed manner. Representative Sample: A random selection of data chosen from the target population which exhibits characteristics typical of the population. Variable: A characteristic or property of an individual unit in the population.
Data Used for Statistics Comes from  Measurements of Observations There are four types of measurements Nominal Ordinal Interval Ratio

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Two Types of Data Nonparametric Data from nominal or ordinal measures are classified as categorical, or nonparametric Parametric Data from interval or ratio measures are classified as continuous, or parametric
There are two types of statistics Descriptive Descriptive statistics serve to summarize data through reduction and simplification of numbers. Inferential Inferential Statistics are used to make an inference, or generalization, about a population from an sample .

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Descriptive Statistics Includes: Collecting data Organizing data Summarizing data Descriptive Inferential Statistics Used when you want to describe some characteristic of a population or sample.
You take an exam. When the exam is returned what information do you want to know so you can see how well you did

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13+Descriptive+Statistics - Statistics Or how I learned to...

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