One-sample t-test

In the last exercise, you used the t.test() function to derive a confidence interval. In this exercise, you will use this function to test if the population's mean amounts to a specific value.

You can get asked about the one-sample t-test if your future role involves testing a sample against a specific benchmark.

In this exercise, you will once again work with the sleep dataset from the datasets package.

The dataset contains the following variables:

group - indicates which drug has been given to a patient (either 1 or 2),
extra - an increase in hours of sleep compared to control.

You will perform the one-sample t-test twice - once for the first group and once for the second group.

Question

What is the null hypothesis of the one-sample t-test?

Possible Answers

The population's mean is different than a given value.
The underlying distribution is normal.
The population's mean equals the hypothesized mean.
The sample needs to be random.

Exercise

One-sample t-test

Instructions 1/3

Question

Possible Answers