cumulative

  1. I

    I need a push in the right direction, not sure how to attack the problems..

    Hi :) I am new here on the forum and find it a bit difficult to learn the way to go at different statistics/probability - problems. For the most times I am able to figure it out myself doing some research, but the last two problems has got me stuck for a few days. I would be really thankful for...
  2. L

    I do not understand..

    Could someone list the steps using excel, mathcad, and/or minitab. Thank you. 1. Did the eight divisions in professional football score equally well on average? Justify your answer. 2. Compare the scoring performance of the two conferences. (I already asked a teacher for help and they did...
  3. C

    Probabilities from Distribution Functions

    Buses arrive at fifteen minute intervals starting at noon. Anne arrives at the bus stop X minutes after noon, where X is a random variable with distribution function FX(x) = P(X ≤ x) = 0 for x < 0, x2 /3600 for 0 ≤ x ≤ 60, 1 for x > 60. (a) What is the probability that Anne waits less than...
  4. 5

    Cumulative relative frequencies

    I have a problem I do not understand. I always end up with result 0.99 instead of 1. See lines 22 and 40: http://pastebin.com/hVcLbVAW Am I not supposed to get 1? Here is the full scenario (from the paste): We are measuring how many times per week people practice sports. absolute...
  5. B

    cumulative distribution function problem

    I have this question I am trying to get through but i keep coming into trouble. The question is: Show that the cumulative distribution function from a uniform distribution of the random variable is Fx(y) = (y-a) / (b-a) for some a < y < b I've started the question but have become stuck...
  6. R

    Proof that the cumulative distribution function doesn't need to be left-contiguous

    If we take (X<=x) = ]-Inf, x] = /intersect_n^inf {]-Inf, x+(1/n)]}, we have that the cumulative distribution function would be F(x) = P(X<=x) = lim_n^inf P(X<=x+1/n), which proofs that the cumulative distribution function needs to be right-contiguous. If I do a similar trick: take (X<=x) =...