Solve above question​

Null hypothesis:

Alternative hypothesis:

The alternative hypothesis for this case is that at least one mean is different from the others.

And the best method for this case is an ANOVA test.

Step-by-step explanation:

For this case we wnat to test if all the mean length of all face-to-face meetings and the mean length of all Zoom meetings are the same. So then the system of hypothesis are:

Null hypothesis:

Alternative hypothesis:

The alternative hypothesis for this case is that at least one mean is different from the others.

And the best method for this case is an ANOVA test.