Low-back pain lbp is a serious health problem in many, Ask an Expert

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Low-back pain (LBP) is a serious health problem in many industrial settings. The article Isodynamic Evaluation of Trunk Muscles and Low-Back Pain Among Workers in a Steel Factory (Ergonomics, 1995: 2107-2117) reported the accompanying summary data on lateral range of motion (degrees) for a sample of workers without a history of LBP and an- other sample with a history of this malady.

Condition	Sample Size	Sample Mean	Sample SD
No LBP	28	91.5	5.5
LBP	31	88.3	7.8

Calculate a 90% confidence interval for the difference between population mean extent of lateral motion for the two conditions. Does the interval suggest that population mean lateral motion differs for the two conditions? Is the message different if we use a confidence level of 95%?

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