A sample of size n=39 has sample mean x̄ = 54 and sample standard deviation s = 6.3. Part: (1)/(2) Part 1 of 2 (a) Construct an 80% confidence interval for the population mean μ. Enter the values for the lower and upper limits and the mean to graph. Round the answers to one decimal place. A sample of size n=39 has sample mean x̄ = 54 and sample standard deviation s = 6.3. Part: (2)/(2) Part 2 of 2 (a) Construct an 80% confidence interval for the population mean μ. Enter the values for the lower and upper limits and the mean to graph. Round the answers to one decimal place. 80% confidence interval 54.5 45.0 64.0
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The margin of error (E) can be calculated using the formula: E = (Z * s) / √n where Z is the z-score corresponding to the desired confidence level. For an 80% confidence level, Z = 1.28. E = (1.28 * 6.3) / √39 E ≈ 2.07 Show more…
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