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Published byCora Palmer Modified over 9 years ago
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L7.1b Continuous Random Variables CONTINUOUS RANDOM VARIABLES NORMAL DISTRIBUTIONS AD PROBABILITY DISTRIBUTIONS
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Standard:MCC9-12.S.MD.1 S-MD.1. (+) Define a random variable for a quantity of interest by assigning a numerical value to each event in a sample space; graph the corresponding probability distribution using the same graphical displays as for data distributions.
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Learning Target Students will define a continuous random variable and a probability distribution for a continuous random variable.
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Vocabulary: A continuous random variable X takes all the values in an interval of numbers. The probability distribution of X is described by a density curve. A uniform distribution refers to a probability distribution for which all of the values that a random variable can take on occur with equal probability.
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Notes: All continuous probability distributions assign probability 0 to each individual outcome. Unlike discrete random variables, in continuous random variables, only intervals of values have positive probability. (the probability of any interval is the same as the length, a single point has no length, therefore its probability would be 0). Normal distributions are probability distributions. The total area under a density curve is always 1, corresponding to the total probability of 1.
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Uniform Distributions The probability is equal to the area below the curve, length of the interval times the height of the distribution. Example: a uniform distribution with a height of 1 over the interval of 0 to 1, the area, and thus the probability, can be calculated by multiplying the length of the interval by 1. P(X≤0.5) = 1x0.5 =.5 or 50% P(0.3 ≤ X ≤ 0.7) = 1x 0.4 = 0.4 or 40%
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The Normal Distribution
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Work Session: The Practice of Statistics text p.471-476 #7.7-7.10 Homework:(Review problems p.476-481 #7.16-7.22
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Essential Question: How can you compare probability distributions for discrete and continuous random variables?
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