1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Fiesta28 [93]
2 years ago
9

A new screening test for West Nile Virus is developed for use in the general population. The sensitivity and specificity of the

new test are 60% and 70%, respectively. 300 subjects are screened at a clinic during the first year the new test is implemented. (Assume the true prevalence of West Nile Virus among clinic attendees is 10%.), The predictive value of a positive test is:
Mathematics
1 answer:
morpeh [17]2 years ago
7 0

The predictive value of a positive test is is 0.43.

------------------

This question is solved using the concepts of sensitivity and specificity.

  • Sensitivity: It is the true negative rate, that is, the proportion of people without the disease that test negative.
  • Specificity: It is the true positive rate, that is, the proportion of people with the disease that test positive.

------------------

  • Sensitivity of 60% means that of the 100 - 10 = 90% of people without the disease, 60% test negative and 100 - 60 = 40% test positive.
  • Specificity of 70% means that of the 10% with the disease, 70% test positive.

------------------

The predictive value of a positive test is:

Probability of a positive test, which is 40% of 90% plus 70% of 10%, so:

p = 0.4\times0.9 + 0.7\times0.1 = 0.43

The predictive value of a positive test is is 0.43.

A similar question is given at brainly.com/question/22373775

You might be interested in
(x-2)times (x^2+8x-1)
DerKrebs [107]

Answer:

x^3+6x^2-17x+2

Step-by-step explanation:

(x-2)*(x^2+8x-1)

=x(x^2+8x-1)-2(x^2+8x-1)

=x^3+8x^2-x-2x^2-16x+2

collect like terms

= x^3+6x^2-17x+2

6 0
3 years ago
An electrical shop reduces display goods by 20%. A display TV is sold for £200. What is the usual price of the same TV?
Fynjy0 [20]
200 is 80%
200 / 80 = 2.50 (1%)
2.50 * 100 = £250

Hope this helps.
8 0
3 years ago
What type of triangle, if any can be formed with angle measurements of 32 degrees,126 degrees, and 32 degrees?
lubasha [3.4K]
There can’t be one formed because all sides of a triangle add up to 180 but when you add that it adds to 190 there for it will not make a triangle
8 0
3 years ago
Explain why their are no solutions to the system of inequalities <br> y ≤2x-5 <br> y ≥2x+1
rosijanka [135]

Answer:

Sorry this is late and I think this is right.

They are both parallel, they have the same slope, and do <em>not </em>intersect. If you were to draw a slope out for it, you would find this to be true.

For example: Say the question called for you to explain why there aren't any solutions to these system of inequalities:

<em>y < - 1/2x -3</em>

<em>y > 1/2x + 2</em>

<em>y= -x/2 -3</em> and <em>y= -x/2 + 2 </em>have the same exact slope, are parallel, and never intersect. The first line is 5 units below the second line when x = 0. Because the lines are parallel, it is always below the second line. The solutions of y < - x/2 -3 are the points in the plane below the first line. The solutions of y > 1/2 + 2 are points above the second line.

I hope this helps you. Good luck on whatever you're working on and stay safe! Please let me know if this helped you or didn't.

7 0
3 years ago
Which contribution is a modification to Dalton's original atomic model?
ahrayia [7]
C
this is because i randomly guessed on ym test and got it right.
3 0
3 years ago
Read 2 more answers
Other questions:
  • Fill in the blank to make the ratios equivalent.<br> 20: 160<br> 1:
    12·2 answers
  • Any help would be great
    14·2 answers
  • 8. Shenea bought 3 bottles of juice for $12. Write the rate as a
    7·1 answer
  • No one seems to be he;ping with this question so please help and show proof of how u got the answer
    6·1 answer
  • Plz helppppp!!!! Thanks
    14·1 answer
  • Please help me I’m begging ya!!!!
    13·1 answer
  • Help!!!!!!!!!!!!!!!!!!!
    5·1 answer
  • Nathan invests money in an account paying simple interest. He invests $180 and no money is added or removed from the investment.
    9·2 answers
  • QuestionFind the unit rate.$9.60 for 4 poundsThe unit rate is $per pound
    7·1 answer
  • Please answer part A and B ( Dividing fractions )
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!