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Unformatted text preview: 1 2 3. The tdistribution. (1). Standard error: When the standard deviation of a statistic is estimated from the data, the result is called the standard error of the statistic. Suppose a population X has mean and standard deviation . It is well known that the sample mean, as a random variable, has mean and standard deviation n . When is unknown, we estimate it with the sample standard (2). The tdistribution Suppose that an SRS of size n is drawn from an N(, ). We know n x ~ N(0,1) Notation t ~ t n1 , or t ~ t(n1). Practice finding t* values from the table. Homework:6.44, 6.47, 6.54, 6.61....
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This note was uploaded on 07/25/2008 for the course STT 421 taught by Professor Nane during the Summer '08 term at Michigan State University.
 Summer '08
 NANE

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