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You're reading from  R Statistics Cookbook

Product typeBook
Published inMar 2019
Reading LevelExpert
PublisherPackt
ISBN-139781789802566
Edition1st Edition
Languages
R
Tools
ggplot
Concepts
Statistics
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Author (1)
Francisco Juretig
Francisco Juretig
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Francisco Juretig

Francisco Juretig has worked for over a decade in a variety of industries such as retail, gambling and finance deploying data-science solutions. He has written several R packages, and is a frequent contributor to the open source community.
Read more about Francisco Juretig

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The univariate t-test

The t-test is a basic tool in statistics used to compare the means of two samples. Its most strict version assumes that both samples are distributed according to a Gaussian distribution and have the same (unknown) variance.

In statistics, we refer to the null hypothesis as the hypothesis we want to test, and the alternative hypothesis as the one we use when the null is rejected. They are usually referred to as H0 and H1.

The t-test tests the equality of means from two populations, and it can be formulated in three possible ways:

  • H0: The means of the two populations are the same versus H1: in that the means of the populations are different.
  • H0: The mean of population 1 is greater or equal than the one from population 2 versus H1: the mean of population 1 is smaller than population 2.
  • H0: The mean of population 1 is smaller or equal than the one from population...
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R Statistics Cookbook
Published in: Mar 2019Publisher: PacktISBN-13: 9781789802566
© 2019 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Francisco Juretig

Francisco Juretig has worked for over a decade in a variety of industries such as retail, gambling and finance deploying data-science solutions. He has written several R packages, and is a frequent contributor to the open source community.
Read more about Francisco Juretig

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