A mayor is concerned about the percentage of city residents who express disapproval of his job performance. His political committee pays for a TV ad. They take a poll of 100 people afterward to test the claim that the TV ad has dropped his disapproval below 32%. The poll showed that his disapproval decreased to 28%. If the test statistic is a z-score, calculate the critical value assuming a significance level of 0.05.

1. -1.96
2. -1.64
3. 2.64
4. -1.70