A t-test for a population mean tests the population mean against a hypothesized value. It is appropriate when the population standard deviation is unknown and the sample size is small. This applet ...
A z-test for a population mean tests the population mean against a hypothesized value. It is appropriate when the variances are known and the sample size is large. This applet allows users to change ...
It is important to test this prediction, and to assess its generality, because it has enormous practical as well as theoretical implications. From the theoretical point of view, the inter-relationship ...
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