PSYCH 2220 Lecture Notes - Lecture 8: Confidence Interval, Statistic, Summary Statistics
22 Feb 2018
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Point estimate: summary statistic - one # as estimate of pop. Interval estimate: based on our sample statistic, range of sample statistics we would expect if we repeatedly sampled from the same pop. Includes mean we would expect for sample statistic a certain % of the time were we to sample from same pop. repeatedly. Range around mean when we add and subtract a margin of error. It confirms the findings of hypothesis testing and adds more detail. Step 1) draw a picture of a distribution that will include confidence intervals (use sample mean) Step 2) indicate the bounds of the ci on the drawing (based on ci %) Step 3) determine the z stats that fall at each line marking the middle 95% Step 4) turn the z stat back into raw means (step 5) check that the cis make sense) Mu = 100, st dev = 15. Psychologist thi(cid:374)ks her se(cid:374)iors(cid:859) s(cid:272)ores are different from mu.
