SOLUTION: A Sample consists of 75 television sets purchased several years ago. The replacement rimes of those TV sets have a mean of 8.2 years and use 1.1 as standard deviation.
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Question 1016642: A Sample consists of 75 television sets purchased several years ago. The replacement rimes of those TV sets have a mean of 8.2 years and use 1.1 as standard deviation.
Construct and interpret a 90% confidence interval for the mean replacement time of all TV sets from that ear ? Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! mean=8.2
sd=1.1
n=75
t0.95 df=74 is 1.66
90% CI is +/- 1.66*(1.1/sqrt(75))
=+/-0.2108
(7.99,8.41)
