Question
a sample of 49 observations is taken from a normal population with a standard deviation of...
a
sample of 49 observations is taken from a normal population with a
standard deviation of 10. The sample mean is 55. Determine the 99%
confidence interval for the population mean. ( round you answers 2
decimal places)
Homework Answers
Answer #1
We have given that,
Sample mean =55
Population standard deviation=10
Sample size=49
Level of significance =1-0.99=0.01
Z critical value (by using Z table)=2.576
Confidence interval formula is
=(51.32,58.68)
Lower confidence limit =51.32
Upper confidence limit =58.68
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