Facts About the F Distribution · Exercise 25

Are the means for the final exams the same for all statistics class delivery types? shows the scores on final exams from several randomly selected classes that used the different delivery types.

$$\begin{array}{ccc}\text{Online}& \text{Hybrid}& \text{Face-to-Face}\\ \text{72}& \text{83}& \text{80}\\ \text{84}& \text{73}& \text{78}\\ \text{77}& \text{84}& \text{84}\\ \text{80}& \text{81}& \text{81}\\ \text{81}& & \text{86}\\ & & \text{79}\\ & & \text{82}\end{array}$$
Assume that all distributions are normal, the four population standard deviations are approximately the same, and the data were collected independently and randomly. Use a level of significance of 0.05.

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

OpenStax, Introductory Business Statistics 2e · §12.4 Facts About the F Distribution · Exercise 25