TABLE 8-15
The president of a university is concerned that illicit drug use on campus is higher than the 5% targeted level.A random sample of 250 students from a population of 2,000 revealed that 7 of them had used illicit drugs during the last 12 months.
-True or False: Referring to Table 8-15,using the 90% one-sided confidence interval,the president can be 95% confident that no more than 5% of the students at the university had used illicit drugs during the last 12 months.

Question

Quizplus · Accepted Answer

Table 8-15 is not provided, so it cannot be used to answer the question. However, even without the table, we can determine that the statement is false. A one-sided confidence interval only considers one direction of the possible outcomes, and the president is concerned about illicit drug use being higher than 5%, not lower. Additionally, the fact that 7 out of 250 students (or 2.8%) used illicit drugs in the last 12 months suggests that the actual rate may be higher than the targeted level of 5%.

TABLE 8-15 The President of a University Is Concerned That Illicit Drug