PSYC 202 Lecture Notes - Lecture 3: Statistical Population, Simple Random Sample, Statistical Inference
30 Nov 2017
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Week 3: sampling error is not making mistakes, but rather the variation that comes with taking a sample. The ai(cid:373) of a(cid:374) idea sa(cid:373)pli(cid:374)g pro(cid:272)ess is to sele(cid:272)t a group of u(cid:374)its that"s a good representation for the statistical population. A volunteer based sample is different form a simple random sample because: Some people may have no chance of being included. Selection of people may be biased samples might not be independent. Experimental studies the goal of experimental studies if different then observational- not interested in characterizing the population, but rather we want to know how that population would respond if we were to give it a certain treatment. We need to categorize and see the difference in data because it comes in so many forms that if (cid:449)e are(cid:374)"t orga(cid:374)izi(cid:374)g oursel(cid:448)es the(cid:374) (cid:449)e (cid:449)ill ha(cid:448)e a hard ti(cid:373)e (cid:373)aki(cid:374)g se(cid:374)se of things data and variables.
