SOLUTION: Nine software engineers were interviewed to develop an estimate for software lines of code. The mean estimate is 12480 lines of code with a standard deviation of 2400 lines of code

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Question 213766: Nine software engineers were interviewed to develop an estimate for software lines of code. The mean estimate is 12480 lines of code with a standard deviation of 2400 lines of code. Develop an 80% confidence interval for the population mean. (Carry intermediate calculations to three decimal places.)

Answer by stanbon(75887) About Me  (Show Source):
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Nine software engineers were interviewed to develop an estimate for software lines of code. The mean estimate is 12480 lines of code with a standard deviation of 2400 lines of code. Develop an 80% confidence interval for the population mean. (Carry intermediate calculations to three decimal places.)
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x-bar = 12480
standard error = 1.2816 = 1025.241
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80% CI: 12480 - 1025.241 < u < 12480 + 1025.41
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Cheers,
Stan H.