28. Believing in Angels. Do you believe in angels? A Gallup Poll found that 78% of respondents believed in angels, 12% were not sure or had no opinion, and 10% didn't believe in angels. Suppose that a survey taken this year of 1000 randomly selected people had the following results.
| Believe in angels? | Yes | No | Not sure or no opinion |
|---|---|---|---|
| Frequency | 820 | 110 | 70 |
Test whether the population proportions have changed, using level of significance .