4.3 notes

4.3 notes - STAT3000 Section 4.3 Random Variables Suppose a...

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STAT3000 Section 4.3: Random Variables Suppose a fair coin is tossed 3 times, then the sample space is: S: {HHH, HHT, HTH, HTT, THH, THT, TTH, TTT} Let X = # of heads per outcome, then X = random variable – a variable whose value is a numerical outcome of a random phenomenon. Therefore, a random variable is a quantitative variable. (no reason) quantitative data – data that are recorded on a naturally occurring numerical scale 52
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discrete random variable – variable that can assume a countable number of values continuous random variable – variable that can assume values corresponding to any points contained in one or more intervals Ex : Which of the following describe continuous random variables, and which describe discrete random variables? a. the number of newspapers sold by the New York Times each month b. the amount of ink used in printing a Sunday edition of the New York Times c. the actual number of ounces in a one-gallon bottle of laundry detergent d. the number of ounces in the label of a one-gallon
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4.3 notes - STAT3000 Section 4.3 Random Variables Suppose a...

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