October 2019
Beginner to intermediate
674 pages
16h 43m
English
Content preview from Mastering pandas - Second Edition
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Statistical hypothesis tests
A statistical hypothesis test is a method that we use to make a decision. We do this using data from a statistical study or experiment. In statistics, a result is termed statistically significant if it is unlikely to have occurred only by chance based on a predetermined threshold probability or significance level. There are two classes of statistical tests: 1-tailed and 2-tailed tests.
In a 2-tailed test, we allot half of our alpha to testing the statistical significance in one direction and the other half to testing the statistical significance in the other direction.
In a 1-tailed test, the test is performed in one direction only.
For more details on this topic, please refer to http://www.ats.ucla.edu/stat/mult_pkg/faq/general/tail_tests.htm ...
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