TABLE 8-12
The president of a university is concerned that illicit drug use on campus is higher than the 5% acceptable level. A random sample of 250 students from a population of 2000 revealed that 7 of them had used illicit drug during the last 12 months.
-Referring to Table 8-12, using the 90% one-sided confidence interval, the president can be 85% confident that no more than 5% of the students at the university had used illicit drug during the last 12 months.

Question

Quizplus · Accepted Answer

The confidence interval is 0.05 +/- 0.033, or (0.017, 0.083). Since the upper bound of the confidence interval is greater than 0.05, the president cannot be 85% confident that no more than 5% of the students at the university had used illicit drug during the last 12 months.

TABLE 8-12 The President of a University Is Concerned That Illicit Drug