A statistician wants to estimate the mean age of all college students. A random sample of 25 student

Statistics
Tutor: None Selected Time limit: 1 Day

A statistician wants to estimate the mean age of all college students. A random sample of 25

students indicates that the mean age is 24.6 years. Past studies showed that the standard deviation

is 1.3 years and the population is normally distributed. Find a 95% confidence interval for the mean

age.

Apr 25th, 2015

the std of the mean age is 1.3/sqrt(25) = 0.26 y

the z alpha for 95% confidence interval for the mean age is 1.98

thus the interval is 

24.6 -1.98*.26< x<24.6*1.98*.26

24.08<x<25.1


Apr 25th, 2015

where did you the 1.98 from?

 

Apr 26th, 2015

thank you i found my answer

Apr 26th, 2015

Studypool's Notebank makes it easy to buy and sell old notes, study guides, reviews, etc.
Click to visit
The Notebank
...
Apr 25th, 2015
...
Apr 25th, 2015
Dec 6th, 2016
check_circle
Mark as Final Answer
check_circle
Unmark as Final Answer
check_circle
Final Answer

Secure Information

Content will be erased after question is completed.

check_circle
Final Answer