During the first few weeks of the new television season, the evening news audience proportions were recorded as ABC- 31%, CBS- 34%, and NBC- 35%. A sample of 600 homes yielded the following viewing audience data.
| | Number of Homes |
ABC | 150 |
CBS | 200 |
NBC | 250 |
We want to determine whether or not there has been a significant change in the number of viewing audience of the three networks.
| a. | State the null and alternative hypotheses to be tested. |
| b. | Compute the expected frequencies. |
| c. | Compute the test statistic. |
| d. | The null hypothesis is to be tested at 95% confidence. Determine the critical value for this test. What do you conclude? |
| e. | Determine the p-value and perform the test. |
10 weeks old human embryo
18 weeks old human fetus
Evening Primrose
Infant: 4 weeks to 1 year.
Phenotypes and proportions