Homework 4_2 - EMSE 171/271 FALL 2005 J.R van Dorp Page 2...

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STATISTICAL REVIEW Homework Set 4_2 EMSE 171/271 - FALL 2005 J.R. van Dorp; ; Page 1 [email protected] Question 3: 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 motion (degrees) for a sample of workers without a history of LBP and another sample with a history of this malady. Condition Sample Size Sample Mean Sample St. Dev No LBP 91.5 5.5 LBP 88.3 7.8 #) $" Calculate a % confidence interval for the difference between population mean *! extent of lateral movement for the two conditions. Does the interval suggests that population mean lateral motion differs for the two conditions? Is the message different if we use a confidence level of %. *&
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STATISTICAL REVIEW Homework Set 4_2
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Unformatted text preview: EMSE 171/271 - FALL 2005 J.R. van Dorp; ; Page 2 [email protected] Question 4: In study of cooper deficiency in cattle, the copper values ( g CU/100ml blood) . were determined for cattle grazing in an area known to have well defined molybdenum anomalies (metal values in excess of the normal range of regional variation) and for cattle grazing in a non anomalous area ("An investigation into Copper Deficiency in Cattle in the Southern Pennines," J. Agricultiral Soc. Cambridge, 1972:157-163), resulting in ( for the anomalous condition and = œ #"Þ& 7 œ %)Ñ " = œ "*Þ%& Ð8 œ %&Ñ # for the non anomalous condition. Test for the equality of variances versus either one of the populations have the larger variance (using two seperate one-sided test) at a significance level of by using the -value !Þ"! : approach....
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