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Assume that a sample is used to estimate a population mean μμ with population standard deviation...

Assume that a sample is used to estimate a population mean μμ with population standard deviation σ=σ= 19.4. Find the 80% confidence interval for a sample of size 577 with a mean of 21.5. Enter your answer as a tri-linear inequality accurate to 1 decimal place.

Math   Statistics-And-Probability   
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Answer #1

80% confidence interval for is

- Z * / sqrt(n) < < + Z * / sqrt(n)

21.5 - 1.2816 * 19.4 / sqrt(577) < < 21.5 + 1.2816 * 19.4 / sqrt(577)

20.5 < < 22.5

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