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Doll And Hill first evaluated the proposition that smoking was a risk factor for lung cancer in a case-control study (Doll and Hill, 1950). They determine that, of 650 men with lung cancer (cases), 645 had smoked at some time, in comparison with the 625 of the 650 men without lung cancer (control).
a) Draw up a clearly labelled and appropriate 2 x 2 table to show these data.
b) How many times more likely was a smoker to develop lung cancer than a non-smoker?
c) Determine the proportion of lung cancers attributable to the smoking among:
i) smokers and
ii) the whole population.
d) What are these measures known as and how does their interpretation differ?
Which of these situations would be most positive to the re-establishment of resident zoochlorellae, assume compatible Chlorella are present in P. bursaria's habitat.
What aspects of the native organ function are replicated, and which are not? (this should include a quantitative analysis of function, for example filtration rates in artificial kidney compared to natural kidney)
All through other periods of time, Tony seems very "down." throughout these times he does not take care of himself. He seems to want to sleep all the time, and he often makes thinly veiled references to wanting to commit suicide.
How will you find out the transcription factor binding sites in the whole genome. You have isolated a novel transcription factor. How would you decide the genes regulated by transcription factor in the whole genome.
The new form of life is discovered. It has a genetic code much like that of organisms on Earth except that there are five different DNA bases instead of four and the base sequences is translated as doublets instead of triplets. How various different ..
Examine the challenges faced by the Public Health System. Epidemiology and Evolving Health Care System
Does this indicate that our original estimate of 350 individuals was too low or too high? Explain your answer in terms of the principles that underlie mark recapture method.
A friend has just returned from a trans-Atlantic jet aircraft flight and reported that the plane dropped about1000 m when it entered an "air pocket." Explain to a friend what apparently happened to cause this drop.
If you were asked to create a karyotype from the chromosome spreads you made from HeLa cells in Activity 4.2.1, list materials you would use and explain how you would make the karyotype.
The patient lives near the San Luis Rey River and has no history of foreign travel, blood transfusion, or intravenous drug use. What is the disease? How was it obtained.
What substance is known as the "spreading factor?" How does the "spreading factor" aid an organism in its quest to penetrate the host cell? What is the dissimilarity between net primary production and net primary productivity.
Using principles of community ecology, propose a hypothesis to explain the results and outline her methods and science processes (as in dependent variable, independent variable, controls, constants) as used in the experiment. What extra evidence woul..
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