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OpenStudy (achu3p):
When do you use the z-statistic instead of the t-statistic in a one-sample t-test for mu?
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Directrix (directrix):
If the population standard deviation, sigma, is known, then the population mean has a normal distribution, and you will be using the z-score formula for sample means. The test statistic is the standard formula you've seen before. Read More Here: https://people.richland.edu/james/lecture/m170/ch09-mu.html
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