An engineer believes it takes an average of 150 man-hours


An engineer believes it takes an average of 150 man-hours to assemble a portion of an automobile. As a check, the time to assemble 10 such parts was ascertained yielding X¯ = 146 and s = 2.5. Test the engineer's belief with α = .05.

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Basic Statistics: An engineer believes it takes an average of 150 man-hours
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