### CFA Practice Question

There are 434 practice questions for this study session.

### CFA Practice Question

A random sample of 85 students in Chicago city high schools take a course designed to improve SAT scores. Based on these students, a 90% confidence interval for the mean improvement in SAT scores from this course for all Chicago city high school students is computed as (72.3, 91.4) points. The correct interpretation of this interval is that ______

I. 90% of the students in the sample had their scores improved by between 72.3 and 91.4 points.
II. 90% of the students in the population should have their scores improved by between 72.3 and 91.4.
Correct Answer: Neither of these statements

The confidence level states the probability that the method will give a correct answer with repeated use. In other words, if you use a 90% confidence interval often, in the long run, 90% of your intervals will contain the true parameter value. This is the proper interpretation of the confidence level.