STAT 2507A – June 17

STAT 2507A – June 17 - STAT2507AWeek5...

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1 STAT 2507A – Week 5 –  June 17 Jerry Situ 7.1 – 7-2 Summer 2009
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Midterm info – Wed. July 8 Covers Chapter 1,2,4,5,6 (only sections listed in the syllabus). Total  of 10 questions (each may have multiple parts)  Each of the 10 questions is worth one tenth of the marks. 2 questions on each chapter material. 2 questions to be taken from Assignment 1 2 questions to be taken from the suggested practice questions. One question involving lab material. Formula sheet will be provided (will be posted on WebCt for  preview).  Non-programmable calculator is permitted. LOCATION: Regular classroom C164  Loeb, start time: 8:05 pm to 10:05 pm. 2
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Review Population: all units of interest Sample: a portion of the population  that is studied Parameter: is a descriptive statistic Inferential statistic: based on the  sample, used to describe the  population.
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Why sample Cost, time, destructive experiment, no  need for excessive accuracy. Typical situation: you know the  distribution, but not the parameters.  Example: student financial need is  consistently normally distributed based  on past data, but mean and variance  changes every year as tuition  increases. 4
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Goal of sampling Get enough information to make our  inferences with an acceptable level of  accuracy Get a sample that is representative of  the population. 5
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How to select the sample Judgement Based on person’s knowledge of the population, the person decides  who’s part of the sample. Example: Delphi method Convenience Based on what is easily obtainable. Ex. Advertising for subjects. Self-selected groups. Probability – based on random selection (only these can be  used to make inferences about the population) Simple random sampling Stratified sampling Cluster sampling 1-in-k sampling 6
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Every sample of size n has equal probability of being  selected. Every member of the population has an equal change  of being selected Can be done  with replacement  or  without  replacement  (typically done without replacement). 7
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STAT 2507A – June 17 - STAT2507AWeek5...

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