Final answer:
The null hypothesis is that the mean length of time doing homework has not increased, while the alternative hypothesis is that it has increased.
Step-by-step explanation:
The null hypothesis for this hypothesis test would be that the mean length of time doing homework each week has not increased.
In this case, the null hypothesis would be that the mean length of time is still 2.5 hours.
The alternative hypothesis would be that the mean length of time doing homework each week has increased.
The alternative hypothesis would state that the mean is greater than 2.5 hours.