Final answer:
The null and alternative hypotheses for the test are stated as follows: Null Hypothesis (H0): There is no significant change in the number of viewing audience proportions for the three networks. Alternative Hypothesis (Ha): There is a significant change in the number of viewing audience proportions for the three networks.
Step-by-step explanation:
The null and alternative hypotheses for this test can be stated as follows:
Null Hypothesis (H0): There is no significant change in the number of viewing audience proportions for the three networks.
Alternative Hypothesis (Ha): There is a significant change in the number of viewing audience proportions for the three networks.