Question
A random sample of size is taken from a population that has a variance of 49....
A random sample of size is taken from a population that has a variance of 49. The sample mean is 90.4, n = 9. Construct a 80% confidence interval for μ.
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Homework Answers
Answer #1
Variance, 
2 = 49
Standard deviation,
= 7
Sample mean, 
= 90.4
Sample size, n = 9
Confidence interval, CI =
Z* 
For 80% confidence level, Z* = 1.282
CI = 90.4
1.282 x 
= 90.4
2.991
= (87.409, 93.391)
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