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Chapter 8 The Binomial and Geometric Distributions YMS 8.1

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##### Chapter 8 The Binomial and Geometric Distributions YMS 8.1

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**Chapter 8The Binomial and Geometric DistributionsYMS 8.1**The Binomial Distributions**Binomial Distribution**• Distribution of the count X of successes in the binomial setting with parameters n and p • n is the number of observations and p is the probability of a success on any one observation • The possible values of X are the whole numbers from 0 to n • Denoted by B(n,p).**Binomial Setting**• Each observation falls into one of just two categories, “success” or “failure” • There is a fixed number n of observations • The n observations are all independent • The probability of success, p, is the same for each observation**Binomial Calculations**• pdf • probability distribution function which assigns value to single outcome X • cdf • cumulative distribution function which assigns value to range of X • Be careful of calculator entries when finding greater than or at least! p445 #8.4-8.8**Vocab and Simulations**• Combination • order doesn’t matter • n choose k • Factorial • n! = n x (n-1) x (n-2) x 3 x 2 x 1 and 0! = 1 • Use randbin(1, p, n) to give 1 p% of the time and 0 (1-p)% of the time**Using Binomials**• Binomial Probability • where the coefficient is a combination • Binomial Mean & Standard Deviation**Normal approximation to binomial distributions**• As the number of trials n gets larger, the binomial distribution gets close to a normal distribution • Rule of thumb • N(np, ) can be used when n and p satisfy np≥ 10 and n(1 – p) ≥ 10 p454 #8.16-8.19 HW: 8.12-8.14, 8.26, 8.32-8.36**YMS 8.2**The Geometric Distribution**Geometric Setting**• Each observation falls into one of just two categories: “success” or “failure” • The probability of success, p, is the same for each observation • The n observations are all independent • The variable of interest is the number of trials required to obtain the first success**Calculating geometric probabilities**• probability that the first success occurs on the nth trial is • probability that it takes more than n trials to see the first success is**Geometric Mean & Standard Deviation**8.37 and 8.40 HW: p474 #8.44-8.46 Review: p479 #8.55-8.56, 8.60, 8.62-8.63