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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%?
max z 3x 9ysubject to 20x 32y 16004x 2y 240y 40x y 0at the optimal solution what is the amount of slack
for the standard normal probability distribution the area to the right of the mean is -0.5 0.5 1 any value between 0
Enter the data shown in the tables above. Create two charts for each urban area that show the immigration distribution. Change the color of a data series in at least one of the charts
Using this information, calculate Blpha risk (probability of Type II error) if the true population mean really is 79.
Workers at a large toxic clean up project are concerned that their white blood cell counts may have been reduced. Let x be a random variable that represents white blood cell count per cubic millimeter of whole blood in a healthy adult.
Problem: A manufacturer of biscuits produces 3 times as many cream ones as chocolate ones. Biscuits are chosen randomly and packed into boxes of 10. Find the probability that a box contains equal numbers of cream biscuits and chocolate biscuits.
Find the questions based on multiple regression - The coefficient of determination for the above model is approximately
If a single test is run and indicates that oil is present,what is the revised probability that oil is actually present.
Four homes are selected at random: What is the probability all four of the selected homes have a security system? (Round your answer to 4 decimal places.
suppose that since the early 1950s some ten-thousand independent ufo sightings have been reported to civil
A company ships computer components in boxes that contain 20 iteams. Assume the probability of a defective component is .4. use the geometric distribution to find the probability that the first defect is found in the third or fourth component test..
the mean for coaches is 90 with a sd of 12 and the mean for players is 70 with a sd of 10. what is the probability that
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