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| 68, 95, 99.7...graph with -3,-2,-1 s, 1s,2s,3s,........+-1 s 68% of data, +- 2s 95%, +-3s 99.7% |
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| each elements of population has = chance of being selected |
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| greek, mu, std dev -rotated b character, total population |
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| latin, x bar, std deviation - s, only for sample of population |
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| population->random sample>30->sample mean (statistic)->normal sampling distribution |
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| normal p value > .05, not normal <.05 |
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| range around a sample mean(random) from population |
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| null hypot(exisiting condition) |
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| Alternative hypot(what want to prove) |
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| compare alpha risk > cant reject Ho, cant accept Ha... alpha risk < reject Ho accept Ha |
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