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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: 31,119
    09-30-2005, 09:44 AM Go to last post
  1. Probability & miscarraige - help a non-maths person :)

    Hello, I'm trying understand this paper on probability, parental age and miscarriage. I have no training in statistics. I'd really appreciate...

    Started by Underscore‎, Today 01:01 PM
    • Replies: 1
    • Views: 46
    Today, 02:05 PM Go to last post
  2. Exponential and Poisson Distribution Problem

    Hello all, we have this problem. Suppose that the continuous random variable T has the Exponential distribution with expected value 4. Given that...

    Started by derian4real‎, 11-10-2017 12:25 PM
    • Replies: 2
    • Views: 274
    11-10-2017, 12:41 PM Go to last post
  3. Standard uniform distribution

    My book says: if x has a standard uniform function then y=1-x also has a standard uniform function. When I try to draw y I get y=0 for 0<=x=>1. ...

    Started by Mada‎, 11-10-2017 03:48 AM
    complement, standard uniform funtion
    • Replies: 0
    • Views: 113
    11-10-2017, 03:48 AM Go to last post
  4. Need stats help

    Have a general question. If you have 3 items and there is a 22% chance each item is valuable. What is the total % value considering all 3? Thanks!

    Started by Neb1976‎, 11-09-2017 08:54 PM
    • Replies: 0
    • Views: 86
    11-09-2017, 08:54 PM Go to last post
  5. Probability of event occuring within an area

    Hi My problem is the following: Within an area om about 30000 square kilometers there are 100 individals. Each individual can be within an area...

    Started by Magnus76‎, 10-29-2017 08:20 AM
    • Replies: 0
    • Views: 288
    10-29-2017, 08:20 AM Go to last post
  6. Why the Chi-square cannot be less than or equal to 1 ?

    Why the Chi-square cannot be less than or equal to 1 ?

    Started by trkmrc‎, 10-28-2017 11:35 AM
    • Replies: 3
    • Views: 189
    10-28-2017, 12:06 PM Go to last post
  7. Identical probability denisty function help needed

    Hello everybody :) Iam struggling with this question, i find this topic hard to understand here is the question Let X and Y be two...

    Started by flexbro‎, 10-27-2017 07:43 AM
    • Replies: 1
    • Views: 162
    10-27-2017, 08:53 AM Go to last post
  8. Double sided gambler's ruin for combat odds?

    Suppose that one unit has an attack factor of 4 and health factor of 4. The other has a defense factor of 3 and a health factor of 2. When either has...

    Started by jimmywalter‎, 10-24-2017 09:31 PM
    game damage
    • Replies: 1
    • Views: 257
    10-26-2017, 09:57 PM Go to last post
  9. Convolution of two probabilities (non-independent)

    I was wondering if the following is true, where * denotes convolution: p(A|C,D) = p(A|B) * p(B|C,D). Basically, I want to know if convolution...

    Started by JoshC‎, 10-23-2017 02:36 PM
    convolution, marginalize, probability distributions
    • Replies: 2
    • Views: 245
    10-23-2017, 02:55 PM Go to last post
  10. Probability of winning or losing in combat game with health factors for each unit.

    In "Civilization", each unit has attack, defense, and health factors. For instance, an armoured unit has an attack factor of 24 and the unit...

    Started by jimmywalter‎, 10-23-2017 02:20 AM
    civilization, combat, win battle
    • Replies: 0
    • Views: 188
    10-23-2017, 02:20 AM Go to last post
  11. Understanding independent events.

    There is a problem I do not understand: Government data show that 8% of adults are full-time college students and that 30% of adults are age 55 or...

    Started by barryjo‎, 10-20-2017 08:58 AM
    • Replies: 1
    • Views: 417
    10-20-2017, 09:02 AM Go to last post
  12. Question Tires Probability Question

    Question: You recently bought a new set of four tires from a manufacturer who just announced a recall because 2% of that particular brand of tires...

    Started by Koshilia‎, 10-19-2017 09:05 PM
    probability
    • Replies: 1
    • Views: 282
    10-19-2017, 09:36 PM Go to last post
  13. Question Tires Probability Question

    Question: You recently bought a new set of four tires from a manufacturer who just announced a recall because 2% of that particular brand of tires...

    Started by Koshilia‎, 10-19-2017 07:05 PM
    probabilities, probability, probability homework help
    • Replies: 0
    • Views: 145
    10-19-2017, 07:05 PM Go to last post
  14. Lightbulb I tried to calculate a probability problem..pls review my try?

    I will be straight and simple on explanation: Abstract: I was playing bingo in a mobile game with my friend, and I wondered, "what is the...

    Started by enoch53‎, 10-13-2017 01:30 PM
    bingo statistics, combination, probabilities
    • Replies: 4
    • Views: 412
    10-14-2017, 02:18 AM Go to last post
  15. Proof help plz

    I took the introduction of probability four years ago and I really can't remember how to solve this. Is there any hint on how should I start?...

    Started by nervedbaby‎, 10-12-2017 10:27 AM
    • Replies: 1
    • Views: 348
    10-13-2017, 03:19 AM Go to last post
  16. Measuring strentgh of competing teams

    The average number of goals scored per match by Team A when playing on home ground is 2.2 with a standard deviation of 1.3 while the average number...

    Started by Onditi‎, 10-10-2017 10:53 AM
    • Replies: 0
    • Views: 208
    10-10-2017, 10:53 AM Go to last post
  17. Combining two sources of uncertainty

    I will use an imperfect dice for simplicity. Let's assume there are two factors that influence the probability of the results obtained from throwing...

    Started by BIal‎, 10-08-2017 09:24 AM
    distribution, probability
    • Replies: 2
    • Views: 303
    10-08-2017, 03:51 PM Go to last post
  18. Conditional probability problem

    Given P(A1) = .12, P(A2) = .07, P(A3) = .05, P(A1 U A2) = .13, P(A1 U A3) = .14, P(A2 U A3) = .10, and P(A1 A2 A3) = .01 What is the probability...

    Started by hankhopkins13‎, 10-07-2017 03:34 PM
    • Replies: 1
    • Views: 322
    10-08-2017, 05:21 AM Go to last post
  19. Infinite summation outcome

    I'm awful with infinite summations! No idea how they did the last step in the proof in the attached image. Can anyone help me figure it out? And in...

    Started by jomak73‎, 09-30-2017 11:42 AM
    • Replies: 3
    • Views: 325
    10-07-2017, 07:08 PM Go to last post
  20. Probability summation help

    I have the following problem: Two cups, A and B, each contain 1 ml of the same infectious serum. If there is a 30% probability that I will get the...

    Started by fc63124‎, 10-07-2017 02:51 PM
    • Replies: 2
    • Views: 252
    10-07-2017, 04:41 PM Go to last post
  21. multiplication rule with two random events?

    Exercise from mathint.com: "The probability that a student passes Mathematics is 2/3 and the probability that he passes English is 4/9 . If the...

    Started by bagocs‎, 10-03-2017 04:44 PM
    • Replies: 1
    • Views: 206
    10-06-2017, 03:41 PM Go to last post
  22. Probability HW help

    I need help with these problems. I worked them out, got answers, and checked the back of the book to see if I got them correct. A pair of...

    Started by evzquz‎, 10-02-2017 05:03 PM
    dice, homework, probability, statistic
    • Replies: 1
    • Views: 322
    10-03-2017, 12:14 AM Go to last post
  23. How many paths exist, probability, etc.

    Thanks for helping. I am taking an online course. Normally I would post my attempt...but I seriously do not know how to start this problem. I am...

    Started by DanielB33‎, 10-01-2017 10:30 AM
    • Replies: 1
    • Views: 361
    10-02-2017, 08:07 PM Go to last post
  24. 10x 1/100

    Hi all, Apologizes for the easy question: Imagine a dangerous mountain where the chance of dying is 1%. If a group of 10 hikes the moutain,...

    Started by STAlexis‎, 09-30-2017 08:58 PM
    • Replies: 1
    • Views: 237
    10-01-2017, 02:07 AM Go to last post
  25. determining the most probable permutation of a set

    Is there any way to determine the most probable permutation of any given set? For example, given the set of letters SKTANH, is there a way to compute...

    Started by bonbonbaron‎, 09-30-2017 09:54 AM
    permutation, recurrent neural network, sequence
    • Replies: 2
    • Views: 283
    09-30-2017, 02:37 PM Go to last post
  26. Sales Probability

    First post on this forum so I hope to explain my question appropriately. Our company issues catalogs to 3,000 customers. The products in this...

    Started by johnnyg‎, 09-29-2017 09:01 AM
    • Replies: 0
    • Views: 235
    09-29-2017, 09:01 AM Go to last post
  27. Determine probabilty of a sampled value being <= 40

    Hi all! Brand new poster here, trying to think back to those stats classes that I hated at the time, but now seem fascinating. Ahhhh to be 18 again...

    Started by LogisticsG‎, 09-27-2017 07:08 PM
    • Replies: 2
    • Views: 347
    09-28-2017, 12:14 PM Go to last post
  28. probobility of a tax inspecton

    From our statistics the probability of getting an inspection in any single week is a pprox 1,000 : 1 I was trying to work out the probability...

    Started by censura‎, 09-27-2017 06:40 PM
    • Replies: 1
    • Views: 260
    09-27-2017, 06:52 PM Go to last post
  29. Ranking products according to their price and probability of sale

    Hello! I have little knowledge of statistics/probability theory, so please bear with me. I was wondering about the following: I have a bunch...

    Started by salt‎, 09-27-2017 08:57 AM
    • Replies: 0
    • Views: 165
    09-27-2017, 08:57 AM Go to last post
  30. Question Help with what a question is asking

    I know how to calculate probabilities, but I want to make sure that I am understanding the question. "What is the probability that the Dow Jones...

    Started by Krazzy2013‎, 09-26-2017 08:40 AM
    clarification, probability, question
    • Replies: 4
    • Views: 394
    09-26-2017, 12:00 PM Go to last post
  31. Distribution of Data

    Hello forum members, I wonder if someone can kindly help. I have a dataset which I've uploaded and I'm trying to work out a sensible distribution....

    Started by jazzfish‎, 09-19-2017 05:33 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 887
    09-24-2017, 11:59 AM Go to last post
  32. What is the probability a particular sequence of 6 letters appearing in 13?

    What is the statistical probability a particular set of 6 letters appearing in a 13 alpha-numerical sequence in the case of: ...

    Started by Mark2015‎, 09-23-2017 04:25 AM
    • Replies: 1
    • Views: 270
    09-23-2017, 08:20 PM Go to last post
  33. Simple Set THeory/Probability Problem

    Hello all, I'm very new to statistics as well as this forum, so please bear with me. I've tried solving this for about 30 minutes now and I've...

    Started by crk05‎, 09-19-2017 11:29 PM
    beginner, probability, set theory
    • Replies: 4
    • Views: 349
    09-20-2017, 02:16 PM Go to last post
  34. Negative Binomial Distribution for Variable Probabilities

    Hi, I wonder if someone can help me. I'm looking to estimate the probability of player a v player b winning a darts match where the player who...

    Started by jazzfish‎, 09-05-2017 10:51 AM
    • Replies: 8
    • Views: 689
    09-06-2017, 05:45 AM Go to last post
  35. Not Statistically Significant.... or is it?

    I am comparing 2 groups to see if there are differences in GPA across 4 years of high school. Group A has a higher mean for all 4 years, BUT... the...

    Started by Stinky‎, 08-31-2017 05:06 PM
    2 Pages
    1 2
    sum of means
    • Replies: 18
    • Views: 1,279
    09-02-2017, 10:52 AM Go to last post
  36. Kruskal Walis & Wilcoxon test

    Hi all, it would be so kind if someone could explain to me as to why both equations, Kruskal Walis and Wilcoxon, consists of the number 12? The...

    Started by yuyanc‎, 08-11-2017 01:19 PM
    • Replies: 1
    • Views: 694
    08-11-2017, 02:01 PM Go to last post
  37. Post urgent question on the mode, median, variance and mean

    We roll two (unbiased) dice and let X and Y be the two numbers that appear. Find the mode, the median, the expectation, and the standard deviation...

    Started by majda‎, 08-06-2017 06:36 AM
    • Replies: 1
    • Views: 679
    08-07-2017, 02:53 AM Go to last post
  38. a fair gambling game

    You want to invent a gambling game in which a person rolls two (unbiased) dice and is paid some money if the sum is 7, but otherwise he loses his...

    Started by majda‎, 08-06-2017 05:22 AM
    • Replies: 1
    • Views: 502
    08-06-2017, 05:37 AM Go to last post
  39. Prob of high risk loans defauting, student text question

    Hi, first of all thanks for reading this. I'm 47 and trying to teach myself Stats from an excellent textbook as part of my course in maths and...

    Started by Koyunbaba‎, 08-03-2017 04:02 AM
    • Replies: 3
    • Views: 488
    08-03-2017, 04:29 PM Go to last post
  40. calculate intersection sets of cell clones in samples?

    Is it possible to calculate the probability of intersection sets in this setting? I have 44000 different cell clones in sample O, I don´t know how...

    Started by Rike133‎, 07-27-2017 06:58 AM
    • Replies: 0
    • Views: 486
    07-27-2017, 06:58 AM Go to last post
  41. 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, 07-26-2017 07:08 AM
    • Replies: 1
    • Views: 611
    07-26-2017, 06:09 PM Go to last post
  42. 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: 1,347
    07-09-2017, 04:45 PM Go to last post
  43. 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: 945
    07-09-2017, 04:15 AM Go to last post
  44. 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: 1,326
    07-07-2017, 12:17 PM Go to last post
  45. 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: 1,465
    07-07-2017, 12:16 PM Go to last post
  46. 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: 1,149
    06-24-2017, 05:43 PM Go to last post
  47. 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: 808
    06-15-2017, 04:59 PM Go to last post
  48. 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: 1,251
    06-12-2017, 06:56 AM Go to last post
  49. 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: 867
    06-08-2017, 10:29 PM Go to last post
  50. 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: 1,483
    06-05-2017, 02:37 PM Go to last post
  51. 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: 1,801
    06-04-2017, 02:09 AM Go to last post
  52. 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: 954
    05-30-2017, 11:36 PM Go to last post
  53. 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: 1,392
    05-30-2017, 05:02 PM Go to last post
  54. 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
    probability
    • Replies: 0
    • Views: 608
    05-30-2017, 05:01 PM Go to last post
  55. 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: 858
    05-27-2017, 11:34 PM Go to last post
  56. 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: 1,027
    05-27-2017, 09:30 PM Go to last post
  57. 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: 1,084
    05-20-2017, 04:20 AM Go to last post
  58. 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: 1,577
    05-11-2017, 03:32 AM Go to last post
  59. 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: 1,182
    05-09-2017, 11:34 PM Go to last post
  60. 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: 1,842
    04-30-2017, 04:26 AM Go to last post

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