A mayor is concerned about the percentage of city residents who express disapproval of his job performance.His political committee pays for a newspaper ad,hoping that it will keep the disapproval rate below 21%.They will use a follow-up poll to assess the ad's effectiveness. A)H0: p 0.21 HA: p 0.21 HA: p = 0.21 C)H0: p 0.21 E)H0: p = 0.21 HA: p

Question

A mayor is concerned about the percentage of city residents who express disapproval of his job performance.His political committee pays for a newspaper ad,hoping that it will keep the disapproval rate below 21%.They will use a follow-up poll to assess the ad's effectiveness. A)H0: p > 0.21 HA: p < 0.21 B)H0: p > 0.21 HA: p = 0.21 C)H0: p < 0.21 HA: p = 0.21 D)H0: p = 0.21 HA: p > 0.21 E)H0: p = 0.21 HA: p < 0.21

Quizplus · Accepted Answer

The null hypothesis (H0) represents the status quo or a statement of no effect, which in this case is that the disapproval rate is at 21% (p = 0.21). The alternative hypothesis (HA) represents the outcome the mayor's political committee hopes to achieve with the newspaper ad, which is to lower the disapproval rate below 21% (p < 0.21).

A Mayor Is Concerned About the Percentage of City Residents