section 3 mis test 1

section 3 mis test 1 - Stats 00:29:00 ← ← Statistics...

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Unformatted text preview: Stats 20/02/2007 00:29:00 ← 2/8/07 ← Statistics • MIS : o An organized collection of people , procedures, databases and devices to provide routine information to managers and decision makers. • Statistics o The SYSTEMATIC study of data o To provide insight into problems affecting: Business Scientific Societal Political Or any other arena o The Role of Statistics Types of stats 2 types • descriptive o describing o census – is a descriptive stats every 10 years a way that stats began – 40’s o have to look at the accuracy o can we get everyone in descriptive stats can it always be accurate o we are looking at a census theoretically this is everyone – not true • inferential o Population o Sample o infer by what you are looking at projecting from a small group – for a large group problem: projecting what millions will do from a small sample bad data in = bad data out o this is what everyone this of as stats ex: Gallop poll (political pol) normally 1500 ppl Types of data Available • Can get from the state website o Many details • Get it and deal with it • Problem? o Where did this come from? o Is this accurate? o Census./descriptive or sample/ infernal Anecdotal • Asking friends about classes • May or may not be like • Story telling o Passing one to the next o Passing the story around • Have to be careful not to take it as fact. • Good for testing and sharing data o But make sure you know the source Observational • Counting what’s happening and how they are responding Experimental • How do we know if ppl are going to like things • Taking a control group and a exp group o Manipulating the data/situation o A lot of things are exp Med – chem. – phy • Most ppl think in terms of this. Population Vs. Sample A population is an ENTIRE groups of objects about which insight or information is desired. • Non necessarily ppl • The population is what we are studying • EX: Class o Everyone enrolled • Parameter**** o A characteristic of a population (ON TEST) o EX: Parameter is 92 o That is a characteristic of everyone A sample is an subset of pop that is used to gain information about the entire pop • A sampling frame – the objection which we select of sample from • Statistic **** (ON TEST) o A characteristic of a sample Parameter = population Statistic = sample o Variables of data collections Qualitative = (observing life) Observational Quantitative = ( numbers) Discrete...
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This note was uploaded on 07/12/2010 for the course MIS 311 taught by Professor Cleveland during the Spring '10 term at University of Texas.

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section 3 mis test 1 - Stats 00:29:00 ← ← Statistics...

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