AP STATS CHP 1 AND 2
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Created by:
meganWelizabeth on September 21, 2011
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18 terms
Terms | Definitions |
|---|---|
 confounding variable | extraneous factor that interferes with the action of the independent variable on the dependent variable |
| selection bias | some part of pop is systematically excluded |
| measurement bias | data doesnt rep the true pop due to measurement error |
| response bias | produces values that systematically differ from true pop in some way..... way things are worded appearance |
| non-response bias | responses arent obtained from everyone in sample... not returning a survey |
| simple random sampling | put in have mix them up draw them out |
| systematic sampling | random but well defined pattern... select one of first 10 names in phone book them every 10th name after that |
| stratified random sampling | divide pop into nonoverlapping groups....when we except different answers. |
| cluster sampling | sample preexisting groups |
| multiple stage sampling | combines several methods... already have groups |
| convinence sampling | anything the reasearcher can do to collect data. easy for researcher |
| response variables | variables you observe for an outcome...dependent |
| explanatory variables | variables that explain change....independant |
| blocking | filter out effects of things we cant control |
| expirenment needs | treatment randomize control block replicate |
| blind | subjects dont know what tx they are gettings |
| double blind | person administering test doesnt know who is getting what tx |
| placebo | control tx |
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