SOLUTION: I need help with the following question please. A sociologist develops a test to measure attitudes about public transportation, and 27 randomly selected subjects are given the t

Question 266356: I need help with the following question please.
A sociologist develops a test to measure attitudes about public transportation, and 27 randomly selected subjects are given the test. Their mean score is 76.2 and their standard deviation is 21.4. Construct the 90% confidence interval for the mean score of all such subjects. You may assume the scores are normally distributed.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A sociologist develops a test to measure attitudes about public transportation, and 27 randomly selected subjects are given the test. Their mean score is 76.2 and their standard deviation is 21.4. Construct the 90% confidence interval for the mean score of all such subjects. You may assume the scores are normally distributed.
-------------
sample mean = xbar = 76.2
standard error = E = zs/sqrt(n)
E = [invT(0.95,df=26)*21.4/sqrt(27) = 1.7056*21.4/sqrt(27) = 7.0245..
--------
90% CI: 76.2-7.0245 < u < 76.2+7.0245
============================================
Cheers,
Stan H.
RELATED QUESTIONS
A sociologist develops a test to measure attitudes about public transportation, and 27... (answered by CPhill)

A sociologist develops a test to measure attitudes about public transportation, and 27... (answered by Fombitz)

This is my problem below. I do not understand much of anything that is going on. At... (answered by rothauserc)

HI I NEED HELP WITH A QUESTION I DON;T KNOW TO REACH THE CONCLSUION I KNOW NOTHING ABOUT... (answered by Alan3354)

I need help with a word problem.- A mad scientist develops a formula which can turn a... (answered by josmiceli)

what can you teach me about algebra roman numarals plese i need to learn this for a test (answered by Ashley_UConn)

I need help with the following question: Abackdrop for a theatre screen is 30m2. About... (answered by rapaljer)

I still have not received any information about this question and I really need help... (answered by rfer,ankor@dixie-net.com)

two angles are supplementary. One angle has a measure of 5x+40 and the other has a... (answered by stanbon,checkley77,jim_thompson5910)