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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: 28,509
    09-30-2005, 09:44 AM Go to last post
  1. 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: 241
    08-11-2017, 02:01 PM Go to last post
  2. 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: 322
    08-07-2017, 02:53 AM Go to last post
  3. 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: 159
    08-06-2017, 05:37 AM Go to last post
  4. 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: 241
    08-03-2017, 04:29 PM Go to last post
  5. 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: 263
    07-27-2017, 06:58 AM Go to last post
  6. 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: 249
    07-26-2017, 06:09 PM Go to last post
  7. 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: 690
    07-09-2017, 04:45 PM Go to last post
  8. 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: 474
    07-09-2017, 04:15 AM Go to last post
  9. 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: 497
    07-07-2017, 12:17 PM Go to last post
  10. 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: 821
    07-07-2017, 12:16 PM Go to last post
  11. 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: 580
    06-24-2017, 05:43 PM Go to last post
  12. 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: 476
    06-15-2017, 04:59 PM Go to last post
  13. 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: 733
    06-12-2017, 06:56 AM Go to last post
  14. 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: 475
    06-08-2017, 10:29 PM Go to last post
  15. 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: 863
    06-05-2017, 02:37 PM Go to last post
  16. 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: 633
    06-04-2017, 02:09 AM Go to last post
  17. 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: 487
    05-30-2017, 11:36 PM Go to last post
  18. 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: 721
    05-30-2017, 05:02 PM Go to last post
  19. 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: 289
    05-30-2017, 05:01 PM Go to last post
  20. 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: 396
    05-27-2017, 11:34 PM Go to last post
  21. 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: 479
    05-27-2017, 09:30 PM Go to last post
  22. 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: 661
    05-20-2017, 04:20 AM Go to last post
  23. 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: 984
    05-11-2017, 03:32 AM Go to last post
  24. 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: 662
    05-09-2017, 11:34 PM Go to last post
  25. 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: 1,302
    04-30-2017, 04:26 AM Go to last post
  26. 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: 856
    04-28-2017, 06:10 PM Go to last post
  27. 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: 1,078
    04-27-2017, 10:10 PM Go to last post
  28. 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: 864
    04-27-2017, 05:38 PM Go to last post
  29. 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: 6,038
    04-18-2017, 03:10 PM Go to last post
  30. 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: 877
    04-18-2017, 02:38 PM Go to last post
  31. [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: 703
    04-18-2017, 09:18 AM Go to last post
  32. 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: 571
    04-16-2017, 06:49 PM Go to last post
  33. 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: 491
    04-16-2017, 05:23 PM Go to last post
  34. 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: 1,692
    03-30-2017, 04:11 PM Go to last post
  35. 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: 908
    03-30-2017, 03:42 PM Go to last post
  36. 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: 825
    03-30-2017, 02:06 PM Go to last post
  37. 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: 657
    03-30-2017, 11:58 AM Go to last post
  38. 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: 816
    03-29-2017, 06:59 AM Go to last post
  39. 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: 1,278
    03-24-2017, 09:11 AM Go to last post
  40. 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: 1,000
    03-23-2017, 10:38 AM Go to last post
  41. 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: 986
    03-19-2017, 02:51 PM Go to last post
  42. 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: 1,480
    03-18-2017, 06:05 PM Go to last post
  43. 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: 1,340
    03-13-2017, 06:02 PM Go to last post
  44. 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: 1,353
    03-09-2017, 04:09 PM Go to last post
  45. 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: 1,383
    03-07-2017, 10:33 PM Go to last post
  46. 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: 1,609
    03-04-2017, 12:06 AM Go to last post
  47. 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: 1,307
    03-03-2017, 05:02 PM Go to last post
  48. 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: 1,460
    03-02-2017, 05:06 PM Go to last post
  49. 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: 1,455
    03-02-2017, 04:20 AM Go to last post
  50. 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: 1,957
    03-02-2017, 04:06 AM Go to last post
  51. 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: 1,431
    03-01-2017, 06:30 PM Go to last post
  52. 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: 1,515
    02-23-2017, 06:05 PM Go to last post
  53. 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: 1,836
    02-23-2017, 03:33 PM Go to last post
  54. 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: 1,568
    02-23-2017, 01:00 AM Go to last post
  55. 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: 1,068
    02-21-2017, 02:47 AM Go to last post
  56. 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: 960
    02-20-2017, 11:03 PM Go to last post
  57. 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: 1,401
    02-18-2017, 08:54 PM Go to last post
  58. 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: 1,069
    02-17-2017, 03:41 PM Go to last post
  59. 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: 1,293
    02-16-2017, 07:25 PM Go to last post
  60. 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: 1,507
    02-15-2017, 11:08 PM Go to last post

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