As prt of a training program, staff at a testing lab applied a screening test to 500 blood samples known to contain HIV. The test was postive for 489 blood samples and negative for 11 samples. as of the same training program, the staff also applied the screening test to 500 other blood samples known to not to contain HIV. The test was positive for 37 blood samples and negative for 463. a. When a new blood sample arrives at the lab, it will be tested to determine whether HIV is present. Using the data from the training program estimate the probability that the screening test would be positive when it is applied to a blood sample that does not contain HIV.
b. Among the blood samples examined in the training program that provided positive screen results for HIV what proportion actually contained HIV?

add 5 subtract 1

step-by-step explanation:

2. angles qrt and qst both measures 156 degrees.

step-by-step explanation:  

we have been given a diagram of a circle and we are told that measure of arc qvt is 156 degrees.  

we can see from our given diagram that angle qrt and angle qst subtends to arc qvt.

since we know that angles subtended by the same arc at the circumference are always equal.

by angle subtended by same arc theorem, measure of angle qrt and angle qst will be equal to the measure of arc qvt.

therefore, angles qrt and qst both measures 156 degrees and 2nd statement is the correct choice.

step-by-step explanation :

we know that

the measurement of the outer angle is the semi-difference of the arcs which comprises

in this problem

m< xzy is the outer angle

substitute the values

the measure of angle xoy is equal to

> by central angle

substitute the value