Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

mandja

  • 2 years ago

Hey, guys, I was wondering if you could help me with some statistics and physics. http://www.trin.cam.ac.uk/show.php?dowid=475 Questions 2, 4, 5, 6, 9 and 10. Thank you :)

  • This Question is Closed
  1. Youngster
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    for number two, make a "tree" i guess, it might help. sorry, im still learning statistics there is a formula for how to find the probablity of B given A, but I can't seem to get it on here. :(

  2. mandja
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Thanks nonetheless... :)

  3. vf321
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    @mandja for #2 what is the probability for a false positive? Are we to assume it is zero?

  4. vf321
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Assuming that the test is 95% accurate for the positive and for 100% accurate for the negative, this is solvable: Let \(C\) denote having the condition and positive/negative signs denote the results. Given is this: \[P(C)=0.001\]\[P(+|C) = 0.95\]\[P(\lnot C)=1-P(C) = 0.999\]\[P(+|\lnot C)=P(\lnot C\land+)/P(\lnot C)=0.05\]Then,\[P(C|+)=\frac{P(+\land C)}{P(+)}\]Since \(P(+) = P(+|\lnot C)P(\lnot C) + P(+|C)P(C)\), we can just plug in the values to get: 1.8%

  5. mandja
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Thanks. For the 4-th question I'm thinking of binomial distribution?

  6. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.