PSYC 3000 Final: Cheat Sheet (Final Exam)
13 Jan 2016
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Decide what stat you are interested in: make hypothesis about nature of population sample is from, construct sampling dist, find observed value of stat, see where observed value fits into population. Hypothesis about the pop. mean : sampling distribution of the mean , stat calc. in sample is sample mean, m. Note that these are very different than alpha levels. Normal distributions: in every normal distribution, the most extreme 5% of values (2-tailed) lie 1. 96 sd or more from the mean. The most extreme 1% of values lie more than 2. 58 standard deviations from the mean. For normal population distributions, the sampling dist. is z. Expected value: average of stat in its sampling distribution, written in . Standard error: sd of stat within its sampling distribution, Generic formula how many se from exp. Only if the distribution is normal is it called z. ( is sd)
