Question: During the early stages of production for a single cylinder engine
During the early stages of production for a single-cylinder engine designed for use in portable generators, the manufacturer randomly selects 12 engines from the end of the assembly line and subjects them to a battery of tests. In the horsepower tests, the engines are found to have an output standard deviation of s = 0.18 horsepower. Assuming a normal distribution of horsepower outputs, determine the 90% confidence interval for σ.
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