Independent t-test

This lesson is called Independent t-test, part of the Inferential Statistics with R course. This lesson is called Independent t-test, part of the Inferential Statistics with R course.

Transcript

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Your Turn

Perform an independent samples t-test to test whether there is a difference in exam_1 by athlete. Use var.equal = TRUE. Is there a difference? What is the p-value?
Perform an independent samples t-test to test whether there is a difference in act_english by gender. Use var.equal = TRUE. Is there a difference? What is the p-value?

Notice what happens since gender has 3 levels. Try out using the filter() function from dplyr to only check the difference between Female and Male students. Alternatively, check out the page on t_test() to see how to use the comparisons argument to specify the groups to compare.

Learn More

We are using the rstatix package for the t_test() function (and other functions in later lessons). We use this package because it is tidyverse-friendly while some base R functions for inferential statistics are not. If you did want to use the base R equivalent function for a t-test, it is t.test().