ZuoTi.Pro
Question

A rapid test for the presence in the blood of antibodies to HIV, the virus that...

A rapid test for the presence in the blood of antibodies to HIV, the virus that causes AIDS, gives a positive result with probability about .004 when a person who is free of HIV antibodies is tested. A clinic tests 1000 people who are all free of HIV antibodies.

a. what is the distribution of the number of positive tests?

b. what is the mean number of positive tests?

c. you cannot safely use the Normal approximation fr this distribution. Explain why?

math   Statistics-And-Probability   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Answer #1

0 0
Add a comment
Know the answer?
Add Answer to:
A rapid test for the presence in the blood of antibodies to HIV, the virus that...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions

  • A test for the presence in the blood of antibodies to HIV, the virus that causes...

    A test for the presence in the blood of antibodies to HIV, the virus that causes AIDS, gives a positive result with probability about 0.004 when a person who is free of HIV antibodies is tested. This is called a false positive. A clinic tests 5000 people who are all free of HIV antibodies. What is the probability that between 10 and 15 people in this sample will receive a false positive reading?

  • A test for the presence in the blood of antibodies to HIV, the virus that causes...

    A test for the presence in the blood of antibodies to HIV, the virus that causes AIDS, gives a positive result with probability about 0.004 when a person who is free of HIV antibodies is tested. This is called a false positive. A clinic tests 5000 people who are all free of HIV antibodies. What is the probability that between 10 and 15 people in this sample will receive a false positive reading?

  • Enzyme immunoassay tests are used to screen blood specimens for the presence of antibodies to HIV,...

    Enzyme immunoassay tests are used to screen blood specimens for the presence of antibodies to HIV, the virus that causes AIDS. Antibodies indicate the presence of the virus. The test is quite accurate but is not always correct. Here are approximate probabilities of positive and negative test results when the blood tested does and does not actually contain antibodies to HIV: Test + Test - Antibodies present 0.9951 0.0049 Antibodies absent 0.0011 0.9989 For example, the top left cell gives...

  • Enzyme immunoassay tests are used to screen blood specimens for the presence of antibodies to HIV,...

    Enzyme immunoassay tests are used to screen blood specimens for the presence of antibodies to HIV, the virus that causes AIDS. Antibodies indicate the presence of the virus. The test is quite accurate but is not always correct. Here are approximate probabilities of positive and negative test results when the blood tested does and does not actually contain antibodies to HIV. Test Result Given antibodies are present 0.9975 0.0025 Given antibodies are absent 0.0060 0.9940 Suppose that 2% of a...

  • Enzyme immunoassay (EIA) tests are used to screen blood specimens for the presence of antibodies to...

    Enzyme immunoassay (EIA) tests are used to screen blood specimens for the presence of antibodies to HIV, the virus that causes AIDS. Antibodies indicate the presence of the virus. The test is quite accurate but is not always correct. Suppose that 1% of a large population carries antibodies to HIV in their blood. Of those that carry the HIV antibodies in their blood, 99.85% will have a positive test result and 0.15% will have a false-negative test result. Of those...

  • 3.   The standard blood test screen for the Human Immunodeficiency Virus (HIV) detects antibodies to the...

    3.   The standard blood test screen for the Human Immunodeficiency Virus (HIV) detects antibodies to the virus using a laboratory test known as ELISA (enzyme-linked immunosorbent assay). If the ELISA test is run properly under recommended conditions, it has a sensitivity of 99% and a specificity of 99%. a) (4 pts) Assume the HIV-ELISA test is administered to a low-risk community of 100,000 people. By low-risk we mean a population which has an HIV prevalence of 1%. Construct the appropriate...

  • please help me with these 5 questions thankss i will give a tumbs up HIV infections...

    please help me with these 5 questions thankss i will give a tumbs up HIV infections and AIDS - Question 1 of 15. These tests do not test for HIV itself, but detect the presence of antibodies: a Antigen tests b. Nucleic acid tests c. Antibody tests d. None of the above HIV Infections and AIDS - Question 2 of 15. The initial manifestation of HIV infection: a. Acute HIV infection b. AIDS c. Clinical/atent HIV infection d. When people...

  • Hi, my answers seemed strange after using Bayes theorem, so I am unsure if I made the right calcu...

    hi, my answers seemed strange after using Bayes theorem, so I am unsure if I made the right calculations. Please show your work so I can catch my error :) Extra Credit: ELISA tests are used to screen donated blood for the presence of the AIDS virus. The test actually detects antibodies, substances that the body produces when the virus is present. When antibodies are present, ELISA is positive with probability about 0.997 and negative with probability about 0.003. When...

  • It’s known that 2 % of people in a certain population have the disease. A blood...

    It’s known that 2 % of people in a certain population have the disease. A blood test gives a positive result (indicating the presence of disease) for 95% of people who have the disease, and it is also positive for 3% of healthy people. One person is tested and the test gives positive result. a. If the test result is positive for the person, then the probability that this person actually has a disease is _________ b. If the test...

  • 1. Name the fluids known to transmit HIV? 2. What is the underlying cause for Jack’s...

    1. Name the fluids known to transmit HIV? 2. What is the underlying cause for Jack’s initial confusion, disorientation and inability to remember things? 3. Since HIV infection and fully developed AIDS are not the same thing, AIDS is defined as?    Dazed and Confused Patients with HIV/AIDS may have peculiar and confusing presentations. Not uncommonly, the first sign may be unusual or ‘opportunistic’ infections. Patients with HIV frequently develop lung infections with Pneumocystis jirovecii which can lead to poor...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT