TABLE 8-12
The president of a university is concerned that the percentage of students who have cheated on an exam is higher than the 1% acceptable level. A confidential random sample of 1,000 students from a population of 7,000 revealed that 6 of them said that they had cheated on an exam during the last semester.
-Referring to Table 8-12, using the 90% one-sided confidence interval, the superintendent can be 85% confident that no more than 1% of the students at the university had cheated on an exam during the last semester.

Question

Quizplus · Accepted Answer

The 90% one-sided confidence interval is 0.001 to 0.014. This means that the superintendent can be 90% confident that the true percentage of students who have cheated on an exam is between 0.001 and 0.014. Since the upper bound of the confidence interval is less than 0.01, the superintendent can be 85% confident that no more than 1% of the students at the university had cheated on an exam during the last semester.

TABLE 8-12 The President of a University Is Concerned That the Percentage