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

Question

Travis Sankovich · Accepted Answer

Final Answer : E, Explanation :  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).

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