Questions
OSC 2030-009 Fall 2025 SUBMIT: Graded Homework Module 7 (Chap 8)
Single choice
Construct a 98% confidence interval estimate for the population mean given the following values:
Options
A.(113.13, 126.87)
B.(113.67, 126.33)
C.(117.46, 122.54)
D.(113.41, 126.59)
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Step-by-Step Analysis
We are asked to construct a 98% confidence interval for the population mean using the given summary values: x̄ = 120, σ = 20, n = 50.
First, compute the standard error of the mean: SE = σ / sqrt(n) = 20 / sqrt(50).
Since sqrt(50) ≈ 7.071, SE ≈ 20 / 7.071 ≈ 2.828.
Next, identify the z-multiplier f......Login to view full explanationLog in for full answers
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