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A dump of our free Chat sessions, in case it is useful. It excludes white boards used during paid sessions.

tutor3 : Hello Student, May I help you with your Math problems?
student : The Rapid Test is used to determine whether someone has HIV (the virus that causes AIDS). The false positive and false negative rates are .027 and .080, respectively. A physician has just received the Rapid Test report that his patient has tested positive. Before receiving the result, the physician assigned his patient to the low risk group (defined on the basis of several variables) with only a 0.5% probability of having HIV. What is the probability that the patient actually has HIV?
student : help
student : do you know how to solve that?
tutor3 : Please wait, we are helping other students
student : how long will i be waiting?
tutor3 : dont wory i will come back to you as soon as it is done
student : alright thanks
tutor3 : the way is : the false negative rate which means the true rate that the person has HIV is .080 and the total probabilty that a person actualy has it is 0.5 . so the probability that he actualy has it is .080/.5 =.16
student : ok
student : is that it? that seems like a simple answer
tutor3 : yes thats it.
tutor3 : if you need anything more Fax your homework to 206-339-8302. or, email to *****@aafter.com. Include your email and phone number. you will be charged accordingly.

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