2. In order to protect the safety of meat produced in the U.S., the Department o
ID: 3313974 • Letter: 2
Question
2. In order to protect the safety of meat produced in the U.S., the Department of Agriculture inspects all cattle at the slaughterhouse, just prior to slaughter. Inspectors look for many different signs of illness in the cattle, and record the occurrence of a number of different diseases. Animals that are found to have any of a long list of diseases, including cancers are condemned, and are not allowed to be used for human consumption. Data on the occurrence of these illnesses might be useful for a kind of animal epidemiology (epizoology). If it were found that there were associations between what the animals eat, drink or breathe and their risk of cancer, then these data might be useful as a kind of environmental monitoring system. Some basic data are provided in the graph below which shows the annual risks (per 100,000 animals) of different kinds of cancer in beef cows. The data for the period from 1979 through 1985 are missing. The graphs seem to indicate broad time trends in these risks, differing by type of cancer Risk of Condemnation, by Cause 70.0 1 60.0 50.0 30.0 20.0 0.0m Year Carcinoma Epthelioms Leuk.LymphomaSarcomaExplanation / Answer
The regression equation can be written as
Risk=0.063*Carci ; Risk=1.32*Epi ; Risk=0.710*Lymph ; Risk=-0.093*Sarc. The slope tells us the extent of dependence that the variable has with the risk. Thus Epi type of cancer has maximum risk. p-va;ue tells us whether the variable is significant enough to be included in the regression. If p<=0.05 for a 95% confidence, then the variable is significant. R^2 tells the amount of variance that is explained by that variable.
For Epi type of cancer the evidence is strongest to suggest the high risk.
The upper image is very blurry. Can you re-attach a clearer and brighter image. I can help then.
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