Facts About the F Distribution · Exercise 24

A researcher wants to know if the mean times (in minutes) that people watch their favorite news station are the same. Suppose that shows the results of a study.

$$\begin{array}{ccc}\text{CNN}& \text{FOX}& \text{Local}\\ \text{45}& \text{15}& \text{72}\\ \text{12}& \text{43}& \text{37}\\ \text{18}& \text{68}& \text{56}\\ \text{38}& \text{50}& \text{60}\\ \text{23}& \text{31}& \text{51}\\ \text{35}& \text{22}& \end{array}$$
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 24