Lecture%207-%20Sampling

Lecture%207-%20Sampling - 10 years to all American...

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Announcements *Team Task 2 due Thursday I. Stage 2/3: Sampling *I.  Who Do You Want to Study?    A. Basic Research  B. Applied Research  II. Populations *A. Defined   *B. Populations of Interest *1. Theoretical (or target) population  *2. Accessible population
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III. Samples *A. Defined *B. Why Does Sampling Matter? Ann Landers asked her readers: “If you had to do it again, would you  have children?” “70% OF PARENTS SAY KIDS NOT  WORTH IT” Try it out… *To examine the incidence of cheating on exams in  her statistics class, Amy observed her students  through a one-way mirror as they took their quiz. *Paul is interested in the success of internet dating.  He interviews 5000 couples who have been 
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dating as the result of internet dating services.  *The United States Census sends out surveys every 
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Unformatted text preview: 10 years to all American households. *Andrew is interested in the migratory patterns of sharp-tongued wrens, which are native to Kansas. He sets up camp in Wichita, Kansas for a year and carefully observes the wrens. C. Sample Size & Sampling Error *1. Factors Determining Sample Size: a. Heterogeneity of the population b. Desired precision c. Available resources *2. Sampling Error D. Generating a Sample *1. Determine Theoretical and Accessible Populations *2. Determine a Sampling Frame To construct a sampling frame: 1. List all cases 2. Decide on a rule defining membership If a listing is not possible, decide on a rule instead (time, place) *3. Select Units Based on a Sampling Design: Probability or Nonprobability Homework 1 Review...
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