STAT 201 Study Guide - Standard Deviation, Tella, Simple Random Sample
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3/23/2010: p = . 14, n = 128, mean is 0. 14 or p, normal distribution n (p, square root of pq/n, standard deviation is square root of ((. 14)(. 86)/128, = . 031, to graph, do the 68, 95, 98. 7 graph, 18% or more, find the z score (0. 18 0. 14/. 031, z score = 1. 30. 4: looking at sampling distribution of sample mean, 20. 5 is population mean (mu), 19. 5 is sample mean (x bar), n = 30, standard deviation, 2. 3/square root 30, find z score if it is asking if a value is unusual, z = 19. 5 20. 5/(2. 3/square root 30, = 2. 38, it is an outlier because z score is less than 2. Know difference between stratified and clustered sampling: part a is a stratified sample (because it says from each category, part b is simple random sampling, part c is systematic sampling, part d is clustering (because it says select a department and test all in the department)
