Statistics Chapter 4: Discrete Random Variables

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5 Terms

1
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Random Variable

a variable that assumes numerical values associated with the random outcome of an experiment, where one (and only one) numerical value is assigned to each sample point

2
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Discrete Random Variable

a countable number of values

Ex: number of sales, number of calls, mistakes per page, people in line

3
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Continuous Random Variable

any value along a given interval of a number line

Ex: length, depth, volume, time, weight

4
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Probability Distributions for Discrete Random Variables

consists of all possible values of a random variable with their associated probabilities

5
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What are the 2 main conditions?

  1. p(x) >= 0 (for all values of x)

  2. Sum of all the probabilities must equal 1