Instruction 9-8
A major home improvement store conducted its biggest brand recognition campaign in the company's history. A series of new television advertisements featuring well-known entertainers and sports figures were launched. A key metric for the success of television advertisements is the proportion of viewers who "like the ads a lot". A study of 1,189 adults who viewed the ads reported that 230 indicated that they "like the ads a lot". The percentage of a typical television advertisement receiving the "like the ads a lot" score is believed to be 22%. Company officials wanted to know if there is evidence that the series of television advertisements are less successful than the typical ad at a 0.01 level of significance.
-Referring to Instruction 9-8,the null hypothesis will be rejected if the test statistics is
A) less than -2.3263.
B) greater than 2.3263.
C) less than 2.3263.
D) greater than -2.3263.

Question

Quizplus · Accepted Answer

Since we want to test if the series of advertisements are "less successful" than the typical ad, we will use a one-tailed test with the alternative hypothesis as Ha: p < 0.22 (where p is the proportion of viewers who "like the ads a lot" for the new series). At a significance level of 0.01, the critical value for a one-tailed test is -2.3263. Therefore, if the test statistic is less than -2.3263, we will reject the null hypothesis and conclude that the series of advertisements are indeed less successful than the typical ad.

Instruction 9-8 A Major Home Improvement Store Conducted Its Biggest Brand Recognition