Posted by Sara on .
Can someone please help me on how to work this out?? I'm so super confused. Thanks!
A professor at Kaplan University claims that the average age of all Kaplan students is 36 years old. Use a 95% confidence interval to test the professor's claim. Is the professor's claim reasonable or not? Explain

StatisticsConfidence Interval 
Sharon,
First find the total age of all students from MM207(9062). Divide 9062 by the total students 244. The answer is 37.139 or 37. 95% confidence interval is 1.96. 37 + or  1.96 =39 or 35. The professor's claim is quite reasonable.

StatisticsConfidence Interval 
PsyDAG,
Apparently Sharon has more data than is indicated on your post. Also I don't know how she found the SD.
95% = mean ± 1.96 SD