Homework Help: Statistics

Posted by Tina on Friday, February 24, 2012 at 2:13pm.

For sample mean x = 150, sample size n = 36 and sample standard deviation s = 40 find 80% confidence interval for population mean. Population standard deviation is not known

Statistics - MathGuru, Friday, February 24, 2012 at 7:10pm
CI80 = mean ą 1.28(sd/√n)

mean = 150
sd = 40
n = 36

Calculate your interval using the above formula.

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