Project #12537 - Biostatistics

Rothenberg et al. (2004) investigated the effectiveness of using the Hologic Sahara Sonometer, a portable device that measures bone mineral density (BMD) in the ankle in order to predict small fractures.  After testing with this device, patients were given an x-ray to confirm the presence or absence of ;a fracture.

 

 

 

 

 

 

 

BMD Test result

X-ray confirmation result

Total

Present (D+)

Absent (D-)

Positive (T+)

314

570

884

Negative (T-)

79

336

415

Total

393

906

1299

 

 

 

 

 

 

 

 

 

 

 

What is the specificity of this test?

 

 

 

 

 

 

 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

What is the sensitivity of this test?

 

 

 

 

 

 

 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

What is the predictive value of a positive test?

 

 

 

 

 

 

 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

What is the predictive value of a negative test?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A drug is being tested for use in the treatment of poison ivy.  Of 190 people tested, 150 gained some relief from the drug.  What is the probability that the drug will be effective on the next patient who uses it?

 

 

 

 

 

 

 
 

 

 

Subject Mathematics
Due By (Pacific Time) 09/20/2013 12:00 am
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