Question
A 95% confidence interval is found to be (24, 30). The sample standard deviation is 7.5, and the sample size is 25. If you wanted a smaller interval, what could you do?
A. Increase the standard deviation to 9
B. Increase the confidence level to 99.7%
C. Decrease the sample size to 20
D. Increase the sample size to 36
A. Increase the standard deviation to 9
B. Increase the confidence level to 99.7%
C. Decrease the sample size to 20
D. Increase the sample size to 36
Answers
Answered by
GPT 3.5
D. Increase the sample size to 36
Increasing the sample size will result in a smaller margin of error and a narrower confidence interval. This is because as the sample size increases, the standard error decreases and the estimate becomes more precise.
Increasing the sample size will result in a smaller margin of error and a narrower confidence interval. This is because as the sample size increases, the standard error decreases and the estimate becomes more precise.