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Forum: Probability

Probability course and homework discussion. Probability distributions. Probability theory, stochastic processes

  1. Arrow Sticky Thread Sticky: We only provide homework help to those who show effort

    Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 30,221
    09-30-2005, 09:44 AM Go to last post
  1. Probability dealing with sample proportion

    I know how to compute the sample mean but I have a problem dealing with sample proportion. The problem is compute the probability that another...

    Started by tiffnnie01‎, 10-16-2008 11:49 AM
    • Replies: 1
    • Views: 4,533
    10-16-2008, 01:06 PM Go to last post
  2. First time taking stats, need some help.. tried on my own still stuck!!

    This is my first year taking stats. I have a ton of homework this weekend, I was able to do most of it but I'm stuck on these questions... 1. How...

    Started by durrs‎, 10-17-2008 02:42 PM
    • Replies: 3
    • Views: 2,877
    10-18-2008, 01:11 AM Go to last post
  3. Probability..not sure if I am using the correct theory;

    I am at my wits end....I have smoked 1000 cigarettes, on the verge of tears and have been up all night trying to determine what formula to use to...

    Started by persephone‎, 10-18-2008 05:46 AM
    • Replies: 1
    • Views: 2,960
    10-18-2008, 09:05 AM Go to last post
  4. Do you think you can solve this problem? (I'm a beginner..please help..)

    Hi guys, I have no idea how to solve this problem...can anyone give me some piece of advice. (please..) If the probability density of X is...

    Started by blackjesus13‎, 10-18-2008 03:14 AM
    • Replies: 1
    • Views: 2,041
    10-18-2008, 09:07 AM Go to last post
  5. Outlier in a small population

    Hi, My question is about an outlier in a small population. I was studying the telecommunication sector in Australia. For this example, let us...

    Started by musicgold‎, 10-13-2008 01:38 AM
    • Replies: 3
    • Views: 3,120
    10-18-2008, 10:00 AM Go to last post
  6. risk

    Hi, sorry if may be a stupid question, but I have a such an elementary doubt: let you suppose that a certain distribution (for example triangular:...

    Started by giordy‎, 10-18-2008 02:44 AM
    • Replies: 4
    • Views: 2,510
    10-18-2008, 12:50 PM Go to last post
  7. Binomial Random Variable

    A study of gambling activity at the university of west georgia discovered that 60% of the male students wagered on sports the previous year. Consider...

    Started by n77ler‎, 10-18-2008 05:23 PM
    • Replies: 1
    • Views: 3,082
    10-18-2008, 06:54 PM Go to last post
  8. Cool true hypothesis and errors??

    Ok...so i have a sample problem that asks to describe the circumstances under which a researcher would make a Type I and or Type II error in the...

    Started by acarnle1‎, 10-18-2008 04:20 PM
    • Replies: 2
    • Views: 1,601
    10-19-2008, 07:26 AM Go to last post
  9. Moment Generating Functions

    This is my first time posting. We just started this and I am completely lost. The problem is to find the mean, variance and the pdf of a random...

    Started by statsmom‎, 10-19-2008 12:03 PM
    • Replies: 1
    • Views: 2,195
    10-19-2008, 12:21 PM Go to last post
  10. Continuous Random Variance

    Assume that x is a binomial random variable with n=1000 and p=0.5 Find the following probabilities: P(x >500) So mu=np=1000x0.5= 500 ...

    Started by n77ler‎, 10-19-2008 09:44 AM
    • Replies: 1
    • Views: 4,077
    10-19-2008, 01:02 PM Go to last post
  11. Conditional Probability

    I am having a very hard time with this one problem, I did a search on the site but came up empty so I'm sorry if this is a repost. Last semester,...

    Started by Spiff321‎, 10-19-2008 03:30 PM
    • Replies: 2
    • Views: 2,356
    10-19-2008, 04:49 PM Go to last post
  12. Binomial Formula ?

    Hi everyone, I'm absolutely going crazy trying to figure this problem out, and I know the answer LOL..I just can't figure out how they got it. Using...

    Started by desmoface‎, 10-18-2008 11:54 AM
    • Replies: 12
    • Views: 3,566
    10-19-2008, 10:25 PM Go to last post
  13. Very easy question for you...help

    Assume that the rate of return on projects is a random variable having a normal distribution with standard deviation = 0.05 per cent. If a bank...

    Started by blackjesus13‎, 10-19-2008 03:29 AM
    • Replies: 6
    • Views: 2,842
    10-20-2008, 11:10 AM Go to last post
  14. Poisson distribution...have you any ideas?

    While away from the office for an hour, a lecturer receives an average of six telephone calls. i)What conditions must be satisfied if the number...

    Started by blackjesus13‎, 10-19-2008 03:31 AM
    • Replies: 1
    • Views: 1,931
    10-20-2008, 11:45 AM Go to last post
  15. probability help greatly needed

    Alright I've got a probability test coming up and our professor gaves us a work sheet with 30+ problems to review and these are some I'm having...

    Started by oomanamemni‎, 10-20-2008 01:00 PM
    • Replies: 1
    • Views: 2,843
    10-20-2008, 01:26 PM Go to last post
  16. Standard deviation from three gaussians

    2 problems. How does one find a standard deviation from three convoluted gaussians. This has come up in two contexts that I have considered...

    Started by tigerstripedcat‎, 10-20-2008 12:39 PM
    • Replies: 1
    • Views: 2,119
    10-20-2008, 01:51 PM Go to last post
  17. Probability Question

    Q 1: A teacher walks, cycles or drives to school with probabilities 0.1, 0.3 and 0.6 respectively. If she walks to school she has a probability of...

    Started by AMI‎, 10-20-2008 05:17 AM
    • Replies: 6
    • Views: 4,873
    10-21-2008, 10:19 PM Go to last post
  18. Poisson

    Suppose that the number of light absorbing molecules or particles along the path of a ray of light entering a body of water is poisson. The...

    Started by mindy‎, 10-21-2008 10:03 PM
    • Replies: 1
    • Views: 2,919
    10-22-2008, 02:59 AM Go to last post
  19. Unhappy probability Homework help please

    I have a stats probability problem for homework. It is a chart showing a survey of patients regarding satisfaction with care and type of surgery. ...

    Started by strugglingwstats‎, 10-21-2008 07:09 PM
    • Replies: 2
    • Views: 8,228
    10-22-2008, 07:05 AM Go to last post
  20. Poisson variables and normal approximation

    I am attaching the questions and my work. It was too difficult to write the formulas in the post. I think I am on the right track - just a little...

    Started by anna_s‎, 10-22-2008 08:50 PM
    • Replies: 1
    • Views: 2,493
    10-23-2008, 06:41 AM Go to last post
  21. Flipping coin

    http://www-stat.stanford.edu/~serban/116/pfin3.pdf How do they derive E(X|H) and E(X|T) in 6(d)? I try Bayes formula but I cant get the same...

    Started by iamsevenup‎, 10-22-2008 01:20 AM
    • Replies: 1
    • Views: 2,829
    10-23-2008, 09:44 AM Go to last post
  22. Bunch of questions (just need help not answers)

    Like the title says, I have a bunch of problems that I don't know how to solve. I learn from looking at examples and trying to figure it out (this...

    Started by pensfan10‎, 10-16-2008 02:07 PM
    • Replies: 9
    • Views: 4,906
    10-23-2008, 10:01 AM Go to last post
  23. Discrete random variable

    Here is a problem given : Let X equal the number of flips of a fair coin that are required to observe heads-tails on consecutive flips. Need to...

    Started by B_Miner‎, 10-17-2008 07:25 AM
    • Replies: 1
    • Views: 4,097
    10-23-2008, 10:27 AM Go to last post
  24. Help with a few probability problems

    Im having trouble figuring out follow two problems. I cant seem to get the problems with "or" or "given" in them. Could you'll please explain how to...

    Started by xal951‎, 10-18-2008 10:15 PM
    • Replies: 1
    • Views: 2,979
    10-23-2008, 11:57 AM Go to last post
  25. Standard Normal Transformation

    f(x) = 1/sqrt(2pi) exp(-1/2* x^2) Find the Density of Y = |X| P(Y =< y) = P(-y =< x =< y) = integral from (y, -y) of f(x) dx. I'm not sure...

    Started by jamesmartinn‎, 10-23-2008 08:53 PM
    • Replies: 1
    • Views: 3,234
    10-24-2008, 12:56 AM Go to last post
  26. Matching Numbers from two baskets

    Hey guys, I would very much appreciate your help here, as I'm stuck with this problem since a couple of evenings now: I have an interval of...

    Started by bastainbrice‎, 10-23-2008 12:10 PM
    • Replies: 2
    • Views: 2,121
    10-24-2008, 02:28 AM Go to last post
  27. Need help with a basic probability question...

    70&#37; of all Super Food stores decided to advertise in their local newspapers. Of those stores that advertised in their local newspapers, 60% had an...

    Started by PunPride‎, 10-24-2008 12:40 PM
    • Replies: 2
    • Views: 2,475
    10-24-2008, 12:53 PM Go to last post
  28. simple probability question

    Hi there, Suppose X~Exp(m) and Y~Bernoulli with P(Y=1|X=x)=exp(b0+b1*x)/(1+exp(b0+b1*x)). I want to find P(Y=1|X>c) where c is a constant. ...

    Started by leo nidas‎, 10-22-2008 12:40 PM
    • Replies: 2
    • Views: 3,260
    10-24-2008, 01:25 PM Go to last post
  29. probability question im having trouble with

    1. A system contains 2 identical pumps 1 and 2, if one pump fails the system will still operate however because of the added strain the other pump is...

    Started by mattg‎, 10-14-2008 04:33 PM
    • Replies: 1
    • Views: 6,807
    10-24-2008, 07:17 PM Go to last post
  30. Question

    A computer program produces a random integer between 0 and 9 (inclusive). Find the Probability that the integer is a number at least a 3. I got the...

    Started by jlhunt30‎, 10-25-2008 01:43 PM
    • Replies: 1
    • Views: 1,929
    10-25-2008, 01:46 PM Go to last post
  31. I am stuck on this one

    It was reported in a medical journal that about 70% of the individuals needinf a kidney transplant find a suitable donor when they turn to registries...

    Started by jlhunt30‎, 10-25-2008 02:42 PM
    • Replies: 1
    • Views: 1,900
    10-25-2008, 03:27 PM Go to last post
  32. one or two tailed?

    Ok, so i know when testing to determine if say a drug umproves some fuction, the null and alternate hypothesis would not be two tailed. But, if im...

    Started by acarnle1‎, 10-26-2008 09:29 AM
    • Replies: 1
    • Views: 2,574
    10-26-2008, 10:43 AM Go to last post
  33. transformation of distributions

    Here is a question: Consider a uniform variable U on (0,1) and define the variable X=e^u. Find the distribution of X. Here is the work I've...

    Started by anna_s‎, 10-26-2008 08:44 AM
    • Replies: 6
    • Views: 2,258
    10-26-2008, 01:41 PM Go to last post
  34. Ztable probability, Please Help

    Im looking back over an old assignment and I cant figure out how to get the correct probability Question: what is the probability of encountering...

    Started by cmf0106‎, 10-26-2008 02:14 PM
    • Replies: 3
    • Views: 2,252
    10-26-2008, 02:37 PM Go to last post
  35. Uniform Variable

    Can someone please help with the below problem? Derive the probability density function of X=U^2, where U is uniform on (0,1) Where do I even...

    Started by tc11‎, 10-26-2008 04:34 PM
    • Replies: 1
    • Views: 2,438
    10-26-2008, 05:29 PM Go to last post
  36. probability

    The ones in red are the ones i have confused. would they be conditional probability therefore would the equation be P (A/B) = P (A and B)/P...

    Started by shezza76‎, 10-26-2008 05:59 PM
    • Replies: 1
    • Views: 1,789
    10-26-2008, 06:34 PM Go to last post
  37. A Drunkard's Random Walk

    Here's a homework problem that I need a hint to get started. D drunkard is taking a random walk. he canstep north or shouth with probability .5...

    Started by statsmom‎, 10-25-2008 11:24 PM
    • Replies: 3
    • Views: 4,785
    10-26-2008, 10:04 PM Go to last post
  38. How to apply a distribution and derive a failure rate?

    please excuse me for my newbie question. certain factors influence the power requirements for my system which comprises of several components. i...

    Started by ChootarLaal‎, 10-27-2008 10:28 AM
    • Replies: 4
    • Views: 4,914
    10-27-2008, 01:18 PM Go to last post
  39. university probability problems, help much appreciated.

    Hi guys, I am really struggling with my university statistics work. Probablity has been really difficult. I have asked my tutors for help, but...

    Started by jon2008‎, 10-27-2008 05:09 PM
    • Replies: 1
    • Views: 4,221
    10-27-2008, 06:14 PM Go to last post
  40. Question Please Help Me Out (I'm Desperate)

    I can't figure these 2 problems out. I'm not very good at stats, so they might be easy. Please answer, even if you only know one of them or part of...

    Started by DrPepper1‎, 10-27-2008 10:24 PM
    • Replies: 10
    • Views: 6,470
    10-28-2008, 03:06 AM Go to last post
  41. a defective probability problem

    I am trying real hard on solving this problem: A sample of 4 different cell phones is randomly selected from a group containing 15 that are...

    Started by carsont89‎, 10-27-2008 03:34 PM
    • Replies: 5
    • Views: 3,079
    10-28-2008, 08:47 AM Go to last post
  42. Probability Distribution

    Hello: A novice statistician here. Hopefully someone can help me with what I expect is an easy question. I'm trying to create a probability...

    Started by kgs‎, 10-07-2008 06:41 PM
    • Replies: 4
    • Views: 2,516
    10-28-2008, 01:12 PM Go to last post
  43. Unhappy Need help on something easy:(

    Nevermind, figured it out..... wont let me delete thread for some reason. Thanks anyways...

    Started by GhettoSuave‎, 10-28-2008 01:47 PM
    • Replies: 0
    • Views: 2,491
    10-28-2008, 01:47 PM Go to last post
  44. probability question

    Hello, I am having trouble with my stat homework. Maybe someone can give me some guidance? I would really appreciate it! A woman is fishing for...

    Started by letsstophere‎, 10-21-2008 09:51 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 7,641
    10-28-2008, 04:23 PM Go to last post
  45. probability homework

    Hello, I am having difficulty figuring out my homework. I made attempts and could someone check my answers and see if I'm right or make suggestions?...

    Started by letsstophere‎, 10-28-2008 08:07 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 6,649
    10-28-2008, 04:41 PM Go to last post
  46. Need some help on a probabilty problem due tonight!

    I made it through all my homework pretty easily but two problems in general are bugging me. Here they are. If anyone is able to help me I'de...

    Started by gdeputy‎, 10-28-2008 05:12 PM
    • Replies: 1
    • Views: 2,586
    10-28-2008, 05:44 PM Go to last post
  47. Please check these.

    I) Suppose X ~ U(-1,1). Find the density of Y = X^2. My prof additionally instructed that in this question he wants us to compute the cdf first, and...

    Started by jamesmartinn‎, 10-28-2008 06:14 PM
    • Replies: 0
    • Views: 2,866
    10-28-2008, 06:14 PM Go to last post
  48. Exponential pdf

    Hello all- Can anyone help on the meaning of the exponential distribution? The derivation I am looking at shows the cdf F(w) = P(W<=w) = 1 -...

    Started by B_Miner‎, 10-28-2008 07:39 PM
    • Replies: 1
    • Views: 3,177
    10-28-2008, 11:29 PM Go to last post
  49. Need to see if i did this correctly... simple question

    What kinds of web sites do males aged 18 to 34 visit most often? Pronogarphic sites take first place, but about 50% of male internet users in this...

    Started by PunPride‎, 10-28-2008 09:25 PM
    • Replies: 1
    • Views: 3,367
    10-28-2008, 11:33 PM Go to last post
  50. Tough probability question...

    We are supposing that the proportion of all adults who think that two children is ideal is p = 0.49. What is the probability that a sample proportion...

    Started by PunPride‎, 10-29-2008 02:48 AM
    • Replies: 2
    • Views: 2,508
    10-29-2008, 01:14 PM Go to last post
  51. Selecting K numbers from N=10^L where group of same prefix exists

    Hello all, I cannot solve following problem. Lets have a phone numbers of the length L. Number of phone numbers is N=10^L. What is the...

    Started by ieee‎, 10-29-2008 07:59 AM
    • Replies: 5
    • Views: 2,756
    10-30-2008, 01:04 PM Go to last post
  52. Not a problem, but an opinion about a book

    I am currently taking a class called Probability/Math Statistics I. We are using a book called Probability and Statistics with Applications. It is...

    Started by pensfan10‎, 10-30-2008 04:22 PM
    • Replies: 4
    • Views: 2,095
    11-01-2008, 10:39 AM Go to last post
  53. Weird Probability Problem

    Hi, I'm having trouble with a problem assigned by my teacher that reads: "Assume that you are boarding a flight in which there are five seats and...

    Started by Addlift‎, 10-28-2008 10:14 PM
    • Replies: 5
    • Views: 6,401
    11-01-2008, 03:49 PM Go to last post
  54. Is this 2 sided or a 1 sided test

    Hello everyone! I am new to Hyposthesis Testing. Suppose my H_0 ( Null Hypothesis ) is : mu =1 I understand that H_1 : mu >1 or H_1 mu<1 are...

    Started by ashim‎, 11-01-2008 10:27 PM
    • Replies: 2
    • Views: 4,017
    11-01-2008, 11:44 PM Go to last post
  55. goodness of fit , 1 sided or 2 sided?

    Hello everyone, I am reading about " accuracy " of the Chi squared test. Now we have the following : - P( X=i ) = 1/6 for all i = 1(1)n ...

    Started by ashim‎, 11-02-2008 10:14 AM
    • Replies: 1
    • Views: 3,447
    11-02-2008, 11:24 AM Go to last post
  56. probability of a machine failure at a certain hour of the day

    Hello folks. I look after some servers at work, one of which is intermittently failing. In the 38 days since I set up monitoring, there have been ten...

    Started by oregano‎, 11-01-2008 02:37 PM
    • Replies: 2
    • Views: 4,603
    11-02-2008, 12:49 PM Go to last post
  57. Smile The sign of COV( f(x,y) , g(x,y) )

    I am a PhD student in Economics, I am reading a paper on statistics, and the author states the following proposition without proof. My question is is...

    Started by Stole‎, 11-01-2008 02:00 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 9,285
    11-02-2008, 03:56 PM Go to last post
  58. Derivative help

    I am having a problem completing a problem because of derivatives. I complete the work down to the part where I get lnL(theta) =nln(theta)- sum...

    Started by statsmom‎, 11-02-2008 12:01 AM
    • Replies: 7
    • Views: 2,682
    11-02-2008, 03:59 PM Go to last post
  59. Reliability of a system with parallel components

    Hi, Consider this q.: If all 3 components in a parallel system function independently of one another, and the reliability at time t of the ith...

    Started by Silvanus‎, 11-03-2008 12:22 AM
    • Replies: 2
    • Views: 6,052
    11-03-2008, 03:02 AM Go to last post
  60. generalized gamma distribution random numbers

    Hi there, Does anyone know how to generate random numbers from the generalized gamma distribution?? If you want to check the density take a look...

    Started by leo nidas‎, 11-03-2008 07:26 AM
    • Replies: 1
    • Views: 4,436
    11-03-2008, 07:38 AM Go to last post

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