STAT 1400 Lecture Notes - Lecture 2: Standard Deviation, Random Variable, Prussian P 8
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The binomial distribution: a binomial random variable has the following four characteristics, there are a fixed number of trials, n, the n trials are all independent. Answers: tow are male and two are female: 0. 3746, all four are male: 0. 0688, all four are same sex: 0. 1254. They can describe a population distribution or a probability distribution: family of density curves, here means are the same (m = 15) while standard deviations are different (s = 2, 30: here means are different (m = 10, 15, and 20) while standard deviations are the same (s = 3) 30: human heights, by gender, can be modeled quite accurately by a normal distribution: t n e c r e. Height (inches) e r o m r o. Answers: between 175 and 625 ml, 250ml and smaller. The standard normal distribution: we can standardize data by computing a z-score m ) If y has the n(m,s) distribution, then z has the n90,1) distribution.
