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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: 30,244
    09-30-2005, 09:44 AM Go to last post
  1. 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: 219
    10-14-2017, 02:18 AM Go to last post
  2. 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: 161
    10-13-2017, 03:19 AM Go to last post
  3. 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: 117
    10-10-2017, 10:53 AM Go to last post
  4. 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: 189
    10-08-2017, 03:51 PM Go to last post
  5. 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: 169
    10-08-2017, 05:21 AM Go to last post
  6. 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: 228
    10-07-2017, 07:08 PM Go to last post
  7. 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: 163
    10-07-2017, 04:41 PM Go to last post
  8. 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: 104
    10-06-2017, 03:41 PM Go to last post
  9. 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: 210
    10-03-2017, 12:14 AM Go to last post
  10. 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: 230
    10-02-2017, 08:07 PM Go to last post
  11. 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: 137
    10-01-2017, 02:07 AM Go to last post
  12. 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: 157
    09-30-2017, 02:37 PM Go to last post
  13. 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: 158
    09-29-2017, 09:01 AM Go to last post
  14. 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: 220
    09-28-2017, 12:14 PM Go to last post
  15. 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: 138
    09-27-2017, 06:52 PM Go to last post
  16. 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: 104
    09-27-2017, 08:57 AM Go to last post
  17. 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: 228
    09-26-2017, 12:00 PM Go to last post
  18. 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: 606
    09-24-2017, 11:59 AM Go to last post
  19. 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: 194
    09-23-2017, 08:20 PM Go to last post
  20. 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: 242
    09-20-2017, 02:16 PM Go to last post
  21. 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: 545
    09-06-2017, 05:45 AM Go to last post
  22. 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: 747
    09-02-2017, 10:52 AM Go to last post
  23. 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: 554
    08-11-2017, 02:01 PM Go to last post
  24. 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: 559
    08-07-2017, 02:53 AM Go to last post
  25. 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: 356
    08-06-2017, 05:37 AM Go to last post
  26. 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: 373
    08-03-2017, 04:29 PM Go to last post
  27. 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: 370
    07-27-2017, 06:58 AM Go to last post
  28. 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: 439
    07-26-2017, 06:09 PM Go to last post
  29. 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: 1,029
    07-09-2017, 04:45 PM Go to last post
  30. 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: 744
    07-09-2017, 04:15 AM Go to last post
  31. 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: 993
    07-07-2017, 12:17 PM Go to last post
  32. 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: 1,230
    07-07-2017, 12:16 PM Go to last post
  33. 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: 869
    06-24-2017, 05:43 PM Go to last post
  34. 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: 684
    06-15-2017, 04:59 PM Go to last post
  35. 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: 1,033
    06-12-2017, 06:56 AM Go to last post
  36. 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: 707
    06-08-2017, 10:29 PM Go to last post
  37. 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: 1,260
    06-05-2017, 02:37 PM Go to last post
  38. 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: 1,348
    06-04-2017, 02:09 AM Go to last post
  39. 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: 787
    05-30-2017, 11:36 PM Go to last post
  40. 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: 1,150
    05-30-2017, 05:02 PM Go to last post
  41. 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: 505
    05-30-2017, 05:01 PM Go to last post
  42. 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: 685
    05-27-2017, 11:34 PM Go to last post
  43. 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: 812
    05-27-2017, 09:30 PM Go to last post
  44. 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: 946
    05-20-2017, 04:20 AM Go to last post
  45. 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: 1,388
    05-11-2017, 03:32 AM Go to last post
  46. 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: 1,005
    05-09-2017, 11:34 PM Go to last post
  47. 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: 1,659
    04-30-2017, 04:26 AM Go to last post
  48. 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: 1,169
    04-28-2017, 06:10 PM Go to last post
  49. 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: 1,902
    04-27-2017, 10:10 PM Go to last post
  50. 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: 1,308
    04-27-2017, 05:38 PM Go to last post
  51. 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: 7,162
    04-18-2017, 03:10 PM Go to last post
  52. 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: 1,267
    04-18-2017, 02:38 PM Go to last post
  53. [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: 1,048
    04-18-2017, 09:18 AM Go to last post
  54. 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: 810
    04-16-2017, 06:49 PM Go to last post
  55. 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: 769
    04-16-2017, 05:23 PM Go to last post
  56. 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: 2,210
    03-30-2017, 04:11 PM Go to last post
  57. 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: 1,317
    03-30-2017, 03:42 PM Go to last post
  58. 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: 1,167
    03-30-2017, 02:06 PM Go to last post
  59. 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: 1,015
    03-30-2017, 11:58 AM Go to last post
  60. 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: 1,231
    03-29-2017, 06:59 AM Go to last post

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