Population  Random Selection  Sample. Sampling Vocabulary Population of Interest  the set of people or things you wish to know something about Sampling.

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Presentation transcript:

Population  Random Selection  Sample

Sampling Vocabulary Population of Interest  the set of people or things you wish to know something about Sampling frame  a list of all subjects from which the sample is taken –What is the difference between the sampling frame and the population of interest? Sample  a portion of the population that is selected to represent the population of interest Random sampling  a way of getting a sample that reduces selection bias –How could we ensure a sample is randomly selected?

Sampling Methods Simple Random Sample (SRS) Stratified Random Sampling Systematic Sampling  Voluntary Response Sample  Convenience Sample  Judgment Sample  “Quickie Polls”

Simple Random Sampling From the entire population every unit has the same chance of belonging to the sample and every possible grouping of specified size has same chance of being selected. Like drawing names out of a hat

Using a Random Number Table to get an SRS Assign a number label to each unit in the population Read numbers from table from left to right, starting anywhere. The subjects selected for the sample are those read from the table. Repeats or those not a part of the list are ignored.

Stratified Sample 1st divide population into groups (strata), then take a Simple Random Sample from each strata (like drawing from multiple hats) From a list of the population, randomly choose a starting subject, and then take every n th subject (for example, start at the 4 th person and sample every 10 th person after, so #4,14, 24, 34, etc.) Systematic Sample

Biased Samples Voluntary Response Sample--radio station call-in or magazine/internet write in Convenience Sample--surveying folks in a mall who appear willing to talk to you Judgment Sample – surveying those you pick as an “expert” selector “Quickie Polls”--hastily designed, poorly pre- tested, one night survey sample for evening news show

Avoiding bias in surveys  Avoid unnecessary complexity to question  Avoid misleading questions  Randomize ordering of questions  Ensure confidentiality  Avoid influencing the subject by tone, appearance, or suggestion Video 14 start at 8:35 (about 3 minutes) ources/series65.html

Lays Potato Chips Sampling Video 13 start at 18:40 (about 8 minutes) htmlhttp:// html