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

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.
-Referring to Table 8-15,what is the critical value for the 90% one-sided confidence interval for the proportion of students who had used illicit drugs during the last 12 months?