SOLUTION: A sample of size 80 from a population having standard deviation σ = 8 produced a mean of 40. The 99% confidence interval for the population mean (rounded to two decimal places
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Question 1054064: A sample of size 80 from a population having standard deviation σ = 8 produced a mean of 40. The 99% confidence interval for the population mean (rounded to two decimal places) is:
The lower limit is
The upper limit is
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
99% confidence interval
x̄ =40, n = 80 and σ=8
ME = ± , z = invNorm(.995) = 2.576
ME = ±
confidence interval for the population mean ( (rounded to two decimal places)
40 - ME < < 40 + ME
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= CI z = value
90% z =1.645
92% z = 1.751
95% z = 1.96
98% z = 2.326
99% z = 2.576
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