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 22%.They will use a follow-up poll to assess the ad's effectiveness.

Question

Quizplus · Accepted Answer

The null hypothesis (H0) should represent the status quo or the situation the mayor hopes to achieve (keeping disapproval at or below 22%), while the alternative hypothesis (HA) represents the outcome the mayor is trying to avoid (disapproval rate dropping below 22%). Therefore, H0: p = 0.22 and HA: p < 0.22 is the correct formulation, as it tests if the ad campaign was effective in reducing the disapproval rate below the threshold of 22%.

A Mayor Is Concerned About the Percentage of City Residents