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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: 27,524
    09-30-2005, 09:44 AM Go to last post
  1. get number of participants from given probability

    Hi! I have a pool of participants - defined number of tournaments (competitions) - defined participants per tournament (partPerTour) Of...

    Started by Pir‎, Today 07:08 AM
    • Replies: 1
    • Views: 59
    Today, 06:09 PM Go to last post
  2. HELP! Confused about this set of related questions

    Hi, I'm stumped on this set of questions. I know it must be very simple, but I can't seem to crack it... Anyone able to give me some direction/Excel...

    Started by erockalberta‎, 07-09-2017 11:21 AM
    • Replies: 1
    • Views: 552
    07-09-2017, 04:45 PM Go to last post
  3. A Puzzling Probability Problem

    Hello everyone. I have encountered these problems. I tried to answer them, but I'm not sure if they are correct.:: I would be very grateful if...

    Started by Gelo‎, 07-08-2017 12:13 PM
    • Replies: 4
    • Views: 366
    07-09-2017, 04:15 AM Go to last post
  4. Minimum CDF of non-independent random variables

    How can I find the CDF for F_{X,Y}={x,x} if X,Y are not-independent. In other words, what will be Pr{min(X,Y)<x} if X,Y are not-independent? If I...

    Started by ghizall4‎, 05-28-2017 03:45 AM
    cdf, distributions, joint-distribution, probability, random-variable
    • Replies: 1
    • Views: 353
    07-07-2017, 12:17 PM Go to last post
  5. Random Vectors and their inner product.

    Let's say i have two random vectors, X and Y, both of length n. The elements of either vector are not independent, and X and Y themselves are not...

    Started by Prometheus‎, 04-18-2017 09:53 AM
    • Replies: 1
    • Views: 671
    07-07-2017, 12:16 PM Go to last post
  6. probability of getting 4 aces when 5 cards are drawn

    Question: Find the probability of getting 4 aces when 5 cards are drawn from an ordinary deck of cards. Which of the followings is the correct...

    Started by woo‎, 06-22-2017 02:04 PM
    • Replies: 1
    • Views: 506
    06-24-2017, 05:43 PM Go to last post
  7. Card Probability Problems

    Scenario: If you have a standard deck of 52 cards and you draw 2 of those cards without replacement, what is the probability of: 1) P(getting a...

    Started by SausageWater‎, 06-09-2017 05:58 PM
    • Replies: 1
    • Views: 391
    06-15-2017, 04:59 PM Go to last post
  8. conjoint analysis

    Hi how i can ask for which situation to use conjoint analysis?

    Started by Kimudao‎, 05-27-2017 11:45 PM
    • Replies: 3
    • Views: 587
    06-12-2017, 06:56 AM Go to last post
  9. Essay Grouping Problem

    if i have 8 essay topics (a,b,c,d,w,x,y,z) and they will be randomly grouped into 2 groups of 4, what is the probability of getting group (a,b,c,d)?...

    Started by probabilityhelpneeded‎, 06-04-2017 12:26 PM
    • Replies: 1
    • Views: 378
    06-08-2017, 10:29 PM Go to last post
  10. Probability of Occurance

    Hi I'm new to probability and need help with what is probably a simple equation for you guys. I am trying to calculate the probability of even A...

    Started by Shiner452‎, 05-30-2017 09:14 PM
    • Replies: 3
    • Views: 689
    06-05-2017, 02:37 PM Go to last post
  11. probability of 3 in a row

    Hi the probability of 1 occurance is about 1 in 10 what i would like to calculate is the probability of 3 of these happening in a row at any time...

    Started by Insight10‎, 06-03-2017 03:46 PM
    • Replies: 3
    • Views: 446
    06-04-2017, 02:09 AM Go to last post
  12. Exclamation Probability of Sampling Error Assistance

    Hello! I am working on a mini project and am stuck on the third question! I think it's how the question is phrased that is throwing me off..? I...

    Started by heidir1224‎, 05-30-2017 11:36 PM
    • Replies: 0
    • Views: 372
    05-30-2017, 11:36 PM Go to last post
  13. Which probability distribution do I use for this, and how?

    Hi all, Im not a statistitian, although I have some reasonable education in mathematics. This isn't a homework question (I'm 37 lol), its just...

    Started by danlightbulb‎, 05-25-2017 04:25 PM
    • Replies: 9
    • Views: 605
    05-30-2017, 05:02 PM Go to last post
  14. Exclamation Probability of H/T Score AND F/T Score Being Specific Scores...

    Hi All, Just trying to answer something in my mind... If I had calculated (using poisson) the chances of various scores occurring in a football...

    Started by SMITH1988CJ‎, 05-30-2017 05:01 PM
    • Replies: 0
    • Views: 230
    05-30-2017, 05:01 PM Go to last post
  15. decile

    hi experts. I 'd like to ask about cluster analysis. to identify the group of customer that which group will have high potential to cancel the...

    Started by Kimudao‎, 05-27-2017 11:34 PM
    • Replies: 0
    • Views: 295
    05-27-2017, 11:34 PM Go to last post
  16. How to calculate posterior probabilities (Bayes related, I think)

    I graduated Uni 16 years ago and generally have no problems with the math and stats I need in my life ... until today. I am breeding horses and there...

    Started by stp486‎, 05-26-2017 05:37 PM
    • Replies: 2
    • Views: 387
    05-27-2017, 09:30 PM Go to last post
  17. Simple Problem

    In a game, you: - Win 70 in scenario 1 - Win 4 in scenario 2 - Lose 20 in scenario3 - Lose 80 in scenario 4 For it to be a fair game, what...

    Started by 5feira‎, 05-19-2017 11:14 PM
    • Replies: 1
    • Views: 579
    05-20-2017, 04:20 AM Go to last post
  18. Distribution of a random sum of random non-iid variables

    I'm trying to find the probability distribution of a sum of a random number of variables which aren't identically distributed. Here's an example: ...

    Started by chaps‎, 05-10-2017 10:11 AM
    • Replies: 1
    • Views: 819
    05-11-2017, 03:32 AM Go to last post
  19. Smile Interpretation of probability density function - uniform distribution

    Dear all, I'm having some problems in the interpretation of the probability density function. Until now I thought that f(x) for a continuous...

    Started by Eometh‎, 05-09-2017 09:48 AM
    density function
    • Replies: 1
    • Views: 565
    05-09-2017, 11:34 PM Go to last post
  20. Smile Chi² distribution link with standard normal distribution?

    Hello, The chi² distribution is the sum of n random standard normal variables. It's used for example to know if a distribution fits the uniform...

    Started by Eometh‎, 04-28-2017 09:27 AM
    • Replies: 4
    • Views: 1,154
    04-30-2017, 04:26 AM Go to last post
  21. Help please on calculating probabilities of certain coin-flip outcomes

    Hi all, (Note: this is not a request for help with "homework"; I'm 51 years old and am trying to learn on my own, through my own "assignments" to...

    Started by lingyai‎, 04-26-2017 12:19 PM
    • Replies: 5
    • Views: 725
    04-28-2017, 06:10 PM Go to last post
  22. Expected number of tries to get all N balls

    We took my grandson to the Santa Cruz Boardwalk. He fell in love with the gondola ride. He wants to go back until he has ridden on all of the 32...

    Started by Jennifer Murphy‎, 04-25-2017 06:34 PM
    • Replies: 8
    • Views: 880
    04-27-2017, 10:10 PM Go to last post
  23. Basic Statistics

    I am sure this is a basic problem that is easily solvable, however, I have not been in a Statistics class in a little over 31 years and have all but...

    Started by mattman519‎, 04-25-2017 11:46 AM
    • Replies: 4
    • Views: 700
    04-27-2017, 05:38 PM Go to last post
  24. Time Series Analysis

    Hello All. I am a new member to this forum. I wish to understand a couple of papers ...

    Started by StatsOntheSide‎, 10-05-2011 08:00 PM
    • Replies: 7
    • Views: 5,609
    04-18-2017, 03:10 PM Go to last post
  25. A puzzling problem

    Hello all, I am posting here looking for help on solving a probability problem I have been struggling with for 2 days. It has been several years...

    Started by Jheath9131‎, 04-14-2017 07:33 AM
    • Replies: 3
    • Views: 763
    04-18-2017, 02:38 PM Go to last post
  26. [Discrete Probability Function] P(X²=1)= P(X=1) U P(X=-1)?

    I would like to know if this following form of interpretation is correct: ========================== Suppose I have a discrete probability...

    Started by Ardêncio‎, 04-18-2017 08:47 AM
    • Replies: 1
    • Views: 619
    04-18-2017, 09:18 AM Go to last post
  27. Hypothesis testing - Type I and II error relationship needed

    Hi! Any idea about how to proof the inequality in formula 1 (see attatchment)? Thank you!

    Started by Lauralethia‎, 04-16-2017 06:49 PM
    • Replies: 0
    • Views: 508
    04-16-2017, 06:49 PM Go to last post
  28. Smile Hypothetical example of using probability to control emotions in business

    Imagine a company where there are two principals. The first person is the founder and owner of the company. The second person is nearly a partner...

    Started by jwoods76‎, 04-16-2017 05:23 PM
    • Replies: 0
    • Views: 435
    04-16-2017, 05:23 PM Go to last post
  29. Conditional Probability

    I have some ambiguity in the following problem Three cards are drawn in succession from a deck without replacement. find the probability...

    Started by Roohul Amin‎, 03-29-2017 03:13 PM
    • Replies: 6
    • Views: 1,471
    03-30-2017, 04:11 PM Go to last post
  30. Exponential Distribution Conditional Probability

    Hello, I have been working with Exponential Distribution problems, but have not come across a problem like this one with both Exponential...

    Started by lucian044‎, 03-30-2017 01:52 PM
    conditional, exponential distribution, probability
    • Replies: 1
    • Views: 776
    03-30-2017, 03:42 PM Go to last post
  31. Unhappy ordering Probabilty in coin tosses

    Hi Guys, First post here so please accept my apologies if this question was posted before. This is baffling me for quite a few days now and I...

    Started by Panda101‎, 03-30-2017 12:01 PM
    • Replies: 4
    • Views: 691
    03-30-2017, 02:06 PM Go to last post
  32. Probability with Permutations Question

    Hello! This is my first time posting and I would appreciate any help at all! So the problem I'm working on has to do with randomly choosing letters...

    Started by lucian044‎, 03-30-2017 11:06 AM
    choose, letters, permutation, probability, random
    • Replies: 4
    • Views: 565
    03-30-2017, 11:58 AM Go to last post
  33. Conditional Probability

    Dear all Please help in solving the following problem. A large industrial firm uses 3 local motels to provide overnight accommodations for its...

    Started by Roohul Amin‎, 03-29-2017 04:10 AM
    • Replies: 1
    • Views: 675
    03-29-2017, 06:59 AM Go to last post
  34. Estimating probability of critical value

    Hello everyone, Once we get a critical value (for example 4.5) how can we estimate the probability of having a value higher than 4.5 if the...

    Started by Eometh‎, 03-24-2017 04:11 AM
    • Replies: 1
    • Views: 1,129
    03-24-2017, 09:11 AM Go to last post
  35. Probability and roundoff errors

    Hi, I work on a real life problem with roundoff errors and found a glitch in my thinking. If someone knows how to solve this problem I appreciate...

    Started by jcarne‎, 03-21-2017 04:34 PM
    • Replies: 1
    • Views: 869
    03-23-2017, 10:38 AM Go to last post
  36. Basic probability distribution table problem

    "What is P(X>4.74)". Can someone please explain how I'd go about this? Would it just be P(5) + P(6)? Thanks a lot.

    Started by touran‎, 03-19-2017 01:49 PM
    • Replies: 1
    • Views: 838
    03-19-2017, 02:51 PM Go to last post
  37. Union and intersection

    43% of adults are stockholders. 75% of adult stockholders have some college education. 37% of adults have some college education. An adult is...

    Started by Regulus‎, 03-14-2017 10:06 PM
    • Replies: 5
    • Views: 1,246
    03-18-2017, 06:05 PM Go to last post
  38. Urgent: Probability of having Lyme Disease and Bayes theorem

    I recently found a deer tick on me (had been there for several days). I have no symptoms. My Dr. says I could ignore it or take a course of...

    Started by ihf‎, 03-13-2017 09:44 AM
    • Replies: 14
    • Views: 1,158
    03-13-2017, 06:02 PM Go to last post
  39. Post conditional probability

    Hello, I have a list of products and for each product corresponds an RCA index as shown in the attached table. I would like to calculate for both...

    Started by gammoudi‎, 03-09-2017 09:41 AM
    • Replies: 3
    • Views: 1,154
    03-09-2017, 04:09 PM Go to last post
  40. Confidence levels

    Hi, I need to calculate the confidence levels that I have enough staff at any point in time to service up to 6 tills in a supermarket. I have a...

    Started by Pigmy‎, 03-07-2017 02:23 PM
    • Replies: 3
    • Views: 1,188
    03-07-2017, 10:33 PM Go to last post
  41. CDF of a PDF with a negative power

    I need to solve the following problem: For a marine hull insurance policy, a claim occurs with probability 0.DD, where DD represents the two...

    Started by endlessend25‎, 03-03-2017 12:19 PM
    density function, self-study
    • Replies: 3
    • Views: 1,380
    03-04-2017, 12:06 AM Go to last post
  42. I need help with a difficult problem

    Here's the problem: Each trial can have 3 outcomes with different chances of each, let's say P(A) = .2, P(B) = .15, and P(C) = .65. I want to find...

    Started by Lazaeus‎, 03-03-2017 01:59 PM
    • Replies: 1
    • Views: 1,076
    03-03-2017, 05:02 PM Go to last post
  43. Exclamation Probability of an Event...in a certain Time!

    Hi Guys, This is probably a basic question for you lot...but let's say I had calculated the chance of an event happening (in this case lets say a...

    Started by SMITH1988CJ‎, 02-28-2017 05:25 PM
    • Replies: 4
    • Views: 1,261
    03-02-2017, 05:06 PM Go to last post
  44. bayes for generating new data

    I am estimating a tree inventory for a city. I have already measured the heights and identified the species for about 1000 trees in some areas of...

    Started by andyspeak‎, 03-01-2017 09:25 AM
    bayes, generate data, spatial statistics
    • Replies: 3
    • Views: 1,248
    03-02-2017, 04:20 AM Go to last post
  45. Roulette - expected value

    Hello, I want to calculate the expected pay-out of european roulette spins. Particularly, I want to know what is the expected pay-out at the...

    Started by federico.zampini‎, 02-09-2017 11:08 AM
    • Replies: 7
    • Views: 1,705
    03-02-2017, 04:06 AM Go to last post
  46. Exclamation Probability of developing a lung cancer disease

    I need to solve this problem: A cohort study is done to assess the impact of smoking on lung cancer. In this study, a large representative sample...

    Started by aptremblay‎, 03-01-2017 03:46 PM
    probability, probability homework help, statistics, statistics problems
    • Replies: 5
    • Views: 1,170
    03-01-2017, 06:30 PM Go to last post
  47. Different solutions when using direct calculation and Chebychev's inequality

    Hi all, I have a question that I can't find answer to: I have 10 random variables X1, X2....X10 which are all independent and exponentially...

    Started by stasezer‎, 02-22-2017 11:39 AM
    chebychev's inequality, probability density
    • Replies: 1
    • Views: 1,325
    02-23-2017, 06:05 PM Go to last post
  48. Fixing the low value and high value in a probabilistic simulation

    Hi, When doing repeated random sampling in a monte carlo method, is there a defined procedure to fixing the low value and high value of the...

    Started by depakroshanblu‎, 02-20-2017 08:58 AM
    • Replies: 10
    • Views: 1,596
    02-23-2017, 03:33 PM Go to last post
  49. Probability of storm surge given parameters for hurricanes.

    I've been working through some statistics problems and could use a little guidance on how to arrive at the right answer (and more importantly, why...

    Started by Foxhound013‎, 02-18-2017 05:35 PM
    • Replies: 4
    • Views: 1,382
    02-23-2017, 01:00 AM Go to last post
  50. Card drawing probability

    Hey all, I have been pondering about a problem in excel and cant seem to figure it out :/ Lets assume I have a card deck of 50 cards. My opening...

    Started by CameronNY‎, 02-20-2017 03:29 PM
    • Replies: 5
    • Views: 916
    02-21-2017, 02:47 AM Go to last post
  51. Probability of throwing n different numbers in m throws of a dice

    Folks I know how to calculate the probability of throwing the same number in every throw of a dice (die, if you prefer!), and I know how to...

    Started by Remster‎, 02-20-2017 05:03 AM
    dice, probability
    • Replies: 1
    • Views: 850
    02-20-2017, 11:03 PM Go to last post
  52. Mean waiting time due to aggregation of k poisson arrivals

    Dear Experts: I want to calculate the mean waiting time due to aggregation of k arrivals following poisson process with rate #λ#. Arrivals are served...

    Started by Hallian1990‎, 02-17-2017 05:59 PM
    probabilities, probability distributions, probability function, queuing, queuing theory
    • Replies: 1
    • Views: 1,225
    02-18-2017, 08:54 PM Go to last post
  53. Probability Question

    Hi Everyone, I'm looking to calculate the probability of the time taken for a specific event. I have: The best case scenario which normally...

    Started by goulding74‎, 02-17-2017 08:58 AM
    lean six sigma, probability
    • Replies: 1
    • Views: 933
    02-17-2017, 03:41 PM Go to last post
  54. Question on sampling without replacement

    Here is a question regarding sampling without replacement. Say there is a class size of 24, and the teacher is breaking students into groups of...

    Started by sjd7aa‎, 02-15-2017 08:30 PM
    • Replies: 1
    • Views: 1,128
    02-16-2017, 07:25 PM Go to last post
  55. Unhappy Conditional Probability Problem Help!

    Hey guys, I got this question as a practice problem. I believe that it's a conditional probability where I should find the probability of NOT...

    Started by nannan‎, 02-15-2017 09:00 PM
    • Replies: 1
    • Views: 1,323
    02-15-2017, 11:08 PM Go to last post
  56. MGF of sample mean of IID poisson RVs

    I am given the MGF of IID RVs as e^{\lambda(e^t-1)} and am supposed to find the MGF of their sample mean of n such RVs. I have am arriving at ...

    Started by nsus‎, 02-12-2017 11:02 AM
    mgf, sample mean
    • Replies: 5
    • Views: 1,720
    02-14-2017, 08:26 PM Go to last post
  57. Question Probability

    (This is a question on probability, not a discussion on politics. Hate or love the President, I hope you all can respond with a mathematical...

    Started by vspinnet‎, 02-13-2017 07:27 AM
    • Replies: 0
    • Views: 1,105
    02-13-2017, 07:27 AM Go to last post
  58. probability


    Started by asonibareoyindamola‎, 02-10-2017 07:49 PM
    • Replies: 1
    • Views: 1,226
    02-10-2017, 08:03 PM Go to last post
  59. Probability to draw an odd number before an even number

    There's 39 numbers in a jar and we're picking them without putting them back. The probability of drawing an odd number and then an even number is...

    Started by TheElder‎, 02-10-2017 06:27 PM
    • Replies: 3
    • Views: 1,253
    02-10-2017, 08:02 PM Go to last post
  60. A random variable's median and variance.

    -Part a) A box from 0 to 1 of height 1. What is its median ? Interpretation/Attempt: A random variable, X, is uniform, (So that its density is...

    Started by Kayl‎, 02-09-2017 05:43 AM
    probability mass function
    • Replies: 0
    • Views: 1,132
    02-09-2017, 05:43 AM Go to last post

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