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Thread: P1 Discussion May 2008!

  1. #1
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    P1 Discussion May 2008!

    It's ok to dicuss the exam now...the mods said ok. Anyone get a
    Bayes questions for their first? Something about finding the p of Female smokers?
    Last edited by edt966; May 19th 2008 at 10:45 PM.

  2. #2
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    It's funny, I just realized I don't remember any of my questions except for something with a quadratic similar to:

    2X - X^2 < 1

    with a standard normal.


    /racks brain
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    Last edited by prufer; January 21st 2011 at 12:55 PM.

  3. #3
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    Okay, another one. A and B are mutually exclusive. C and D are mutually exclusive.

    P(A) given
    P(C) given?
    P(A intersect C) given

    Find P(B intersect D).


    I thinkkk that was it.
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    Last edited by prufer; January 21st 2011 at 12:55 PM.

  4. #4
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    what i remember

    i had a gamma question, no weibul pareto lognormal beta or chi square.
    one mgf
    no multivariate transformation or bivariate normal
    a lot of bivariate discretes, way more than I expected, but they were ok
    im blanking on the rest

  5. #5
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    There's always a question or two that I ponder after the test. I think I may have to break out the calculator and filler paper once more before taking a break. :unsure:

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    Oh oh oh! Did anyone get one about a mgf that listed three properties and asked which must be true? And the choices were something like

    a) i and ii
    b) ii and iii
    c) i and ii and iii
    d) ii and iii
    e) i and iii


    ?
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    Last edited by prufer; January 21st 2011 at 12:56 PM.

  7. #7
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    Hey Prufer, I had both those questions.

    The only other question I remember for sure (because it was short) was: Two people arrange to meet sometime between 4 and 5 pm. They each arrive at different times. What's the probability that the first person to arrive will have to wait at least 20 minutes for the other person?

  8. #8
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    Quote Originally Posted by prufer View Post
    Oh oh oh! Did anyone get one about a mgf that listed three properties and asked which must be true? And the choices were something like

    a) i and ii
    b) ii and iii
    c) i and ii and iii
    d) ii and iii
    e) i and iii


    ?
    oh yea. i did get one like that too.

    Also i got one where you have X following a normal distribution of mean 5 and standard deviation 1 or something, and then you have to find the probability that 8X - X^2 < 1. I didn't know how to do this one...

  9. #9
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    Quote Originally Posted by cron View Post
    oh yea. i did get one like that too.

    Also i got one where you have X following a normal distribution of mean 5 and standard deviation 1 or something, and then you have to find the probability that 8X - X^2 < 1. I didn't know how to do this one...

    I think I had st.dev. = 2. I set the inequality equal to 0 and used the quadratic formula to find the two values of X. Then I plugged both of those into the standard normal equation with whatever it fit into, > or <, and added (or subtracted, I forgot) the two numbers I got from the chart. Not sure if it was the right thing to do, though!
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    Last edited by prufer; January 21st 2011 at 12:56 PM.

  10. #10
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    I also remember one that wasn't too complicated once you sifted through the odd explanation. It was about a town with the city hall located at the origin, and residents could only walk to the building in parallel lines to the x- and y-axis. I think it asked you to find the expected value of the distance traveled by a resident.
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    Last edited by prufer; January 21st 2011 at 12:56 PM.

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