Question 1049192: Any help on this is appreciated:
You were interested in how long the average psychology major at your college studies per night, so you asked 10 psychology majors to tell you the amount they study. They told you the following times: 2, 1.5, 3, 2, 3.5, 1, 0.5, 3, 2, 4.
(a) Find the 95% confidence interval on the population mean.
(b) Find the 90% confidence interval on the population mean.
Answer by ewatrrr(24785)   (Show Source):
You can put this solution on YOUR website! { 2, 1.5, 3, 2, 3.5, 1, 0.5, 3, 2, 4 }
x̄ = 2.25
s = 1.11
For a population with unknown mean and unknown standard deviation ,
a confidence interval for the population mean is: CI = x̄ ± 
CI = 2.25 ± 
95% confidence level, Degree of Freedom(n-1) = 9: t = 2.26 (use Calculator 0r table)
CI = 2.25 ± 
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90% confidence level, Degree of Freedom(n-1) = 9: t = 1.83 (use Calculator 0r table)
CI = 2.25 ± 
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