Disease Detective B/C

ILoveEgretsClub
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Re: Disease Detective B/C

Postby ILoveEgretsClub » April 28th, 2012, 8:55 pm

I looked around, and it seems like there's an equal split between people who put it as percentages and cases per 100,000. Is it okay if I use both on the test? For example...

Ans: 449 cases per 100,000 (4.49%)
I believe it would be 0.449%...
If they specify which to use or use either in a question, I guess just go with that. I think the way to calculate should be out of 100,000 though.
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Re: Disease Detective B/C

Postby Sunniday » April 29th, 2012, 8:51 am

Claggett! We actually got a decent team this year.
2011: {Regionals/States}- Anatomy 1-1. MagLev N/A-1. Experimental Design 3-6.
2012: {Regionals/States}- Anatomy 1-6. Disease 1-8. Bottle Rockets 1-15. Experimental Design 1-5 Food Science Conflict-2.

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Re: Disease Detective B/C

Postby havenguy » April 29th, 2012, 9:03 am

Taken directly from Wikipedia:

"For example, the prevalence of obesity among American adults in 2001 was estimated by the U. S. Centers for Disease Control (CDC) at approximately 20.9%. In plain English, "prevalence" simply means "extent", but in scientific English it means "proportion" (typically expressed as a percentage) ."
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Re: Disease Detective B/C

Postby ILoveEgretsClub » April 29th, 2012, 10:47 am

http://www.blackwellpublishing.com/spec ... _9_188.pdf

Directly taken as well....

"Another common way of expressing prevalence, particularly if the prevalence is low, is as the
number of cases per 100,000 of the population. For example, it is easier to
state the result as `66 cases per 100,000 people' than to say the prevalence is
0.00066."

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Re: Disease Detective B/C

Postby SciBomb97 » April 29th, 2012, 2:07 pm

I think you can actually make it out of 1000 in such cases.
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Re: Disease Detective B/C

Postby The Eviscerator » April 29th, 2012, 6:05 pm

The question will almost always (ideally, should) tell you what to express prevalence and incidence in terms of, whether it is as a percentage, per 100,000, or per 1,000. (i.e. They can be expressed in any of these ways, just make sure you answer the question posed.)

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Re: Disease Detective B/C

Postby Emerald Lily » May 4th, 2012, 9:03 pm

Is there a website that has good info on how to identify study designs from case scenarios?

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Re: Disease Detective B/C

Postby deezee » May 5th, 2012, 11:15 am

Is there a website that has good info on how to identify study designs from case scenarios?
Science Olympiad's own website (soinc.org) has a bunch of great resources under the disease detectives page. there are documents and info on case designs and practice tests.
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Re: Disease Detective B/C

Postby Emerald Lily » May 5th, 2012, 7:41 pm

What is an example of an intermittent common source?

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Re: Disease Detective B/C

Postby Lady Epidemic » May 7th, 2012, 8:29 am

What is an example of an intermittent common source?
Like, if a restaurant at an airport was only open on alternating days, or something? So it would always come from the same place, but at alternating times.
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