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10 Feb 2012
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Statistics- getting information from data (branch of science) (1)collection (2)organize (3)present (4)analyze (5)interpret. Descriptive- organizing, summarizing, present data (doesn"t draw conclusion) Inferential- draws conclusion about characteristics of population based on sample size. Data- # of cans consumed in 7 days by students. Population- all 50,000 students (group of all items) Sample- 500 students of 50,000 (set of data from population) Mean- # of cans consumed by all students. Parameter- mean # cans consumed by all students (descriptive measure of population) Statistic- mean # cans consumed by 500 students (descriptive measure of sample) Confidence level- proportion of time the procedure will be correct (success) Significance level- measures how frequently the conclusion will be wrong (failure) 1 = 0. 05 significant level (confident + significant level = 1) 1 0. 05 = 0. 95 confident level ex. accurate 19 out of 20 times = 19/20 = 0. 95 confident n = ___n____ 95% confident = ____500_____ = 222.

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