Paired t-testPaired t-test

The following function performs a paired t-test.

It is similar to the one for independent samples, but here we do not obligate to check the homogeneity of variance. Paired t-test does not assume that variances are equal.
To perform a paired t-test, samples' sizes must be equal.

Knowing this, you can move to the task where you will perform a paired t-test.

Here you have data about the number of downloading one app; look at the samples: the mean values are almost equal.


We state the hypotheses:

  • H₀: the mean number of downloading before and after changes are similar.
  • Hₐ: the mean number of downloads is larger after modifications.

Conduct paired t-test with such alternative hypothesis, setting before and after as the samples.

Everything was clear?

Section 6. Chapter 8
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