October 2019
Beginner to intermediate
674 pages
16h 43m
English
Content preview from Mastering pandas - Second Edition
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The t-test
The z-test is useful when the standard deviation of the population is known. However, in most real-world cases, this is an unknown quantity. For these cases, we turn to the t-test of significance.
For the t-test, given that the standard deviation of the population is unknown, we replace it with the standard deviation, s, of the sample. The standard error of the mean is now as follows:
The standard deviation of the sample, s, is calculated as follows:
The denominator is N-1 and not N. This value is known as the number of degrees of ...
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