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Biostatistics Lecture 4

# Example just some made up but simple numbers suppose

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Unformatted text preview: nother idea…. Rules for adding two (or more) random variables. Example (just some made up, but simple, numbers): Suppose comes from . Then the expected value of is and the variance of is Suppose comes from Then the expected value of is . is and the variance of Consider which comes from the 12 possible sums of and values Then the expected value of is and the variance is We see that What does and and . . look like? In general, there are four rules related to changing random variables: 1. 2. 3. 4. Rule 2: represents the original data, and represents the data that has been multiplied by and then had added to it. See Class Example 3, in which we convert some Celsius temperatures to Fahrenheit, so and ....
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