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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: 16,652
    09-30-2005, 09:44 AM Go to last post
  1. Question What type of distribution is being described (binomial or poisson)?

    hhhhhhhhjjjj

    Started by georginatz‎, 08-26-2016 02:43 AM
    • Replies: 2
    • Views: 159
    08-26-2016, 07:59 AM Go to last post
  2. What would the Null Hypothesis be for predicting sports outcomes?

    So I made a program to predict the outcome of baseball games, as either a W or a L for the home team. I want to know if my program and algorithm are...

    Started by kovy‎, 08-24-2016 06:09 PM
    • Replies: 3
    • Views: 186
    08-26-2016, 03:07 AM Go to last post
  3. Use of Bayes Theorem

    Hi, I am new here, thanks for having me. I am not a statistician though I have done a stats course at Uni (a long long time ago!). I am trying to...

    Started by EricH‎, 08-25-2016 08:32 PM
    • Replies: 0
    • Views: 68
    08-25-2016, 08:32 PM Go to last post
  4. Incidence rate in population and in random sample

    How can I anser a question like the following: When the true incidence rate of an event in the population is "X" (say, 12%), how likely is it that...

    Started by AVoelp‎, 08-25-2016 10:09 AM
    • Replies: 1
    • Views: 74
    08-25-2016, 04:16 PM Go to last post
  5. Unhappy conditional probability

    For a combined ELISA-Western blot blood test for HIV positive status, the sensitivity P(positive test |HIV) is about 0.999 and the specificity...

    Started by RachelCrowley‎, 08-25-2016 10:15 AM
    • Replies: 2
    • Views: 113
    08-25-2016, 02:56 PM Go to last post
  6. False positives

    Hi everyone, This is my first post and had a basic (I think) question. Are false positives by definition a conditional probability? I was...

    Started by JFish‎, 08-11-2016 07:05 PM
    • Replies: 12
    • Views: 464
    08-14-2016, 01:38 AM Go to last post
  7. Question Poisson curve for low lambda

    Hello, I'm quite new to probability and currently trying to understand the different distributions. I see the Poisson curve is weirdly shaped...

    Started by psam‎, 08-12-2016 09:29 AM
    • Replies: 6
    • Views: 230
    08-12-2016, 10:32 AM Go to last post
  8. Question Continuity Correction and probability using standard normal distribution table

    I having trouble understanding the Z score along with getting my mean/SD with the below question. I need to know the break down of "how" rather than...

    Started by tessa1430‎, 08-02-2016 04:32 AM
    • Replies: 1
    • Views: 248
    08-04-2016, 08:27 PM Go to last post
  9. Post Vehicles accident probability

    Hi, I would like to know the probability of Vehicles accident in a street. Which kind of probability distribution should I use? Please Help me :)...

    Started by zeezoo‎, 08-01-2016 03:10 PM
    • Replies: 2
    • Views: 238
    08-02-2016, 05:58 PM Go to last post
  10. Conditional distribution of 3 multivariate normal distribution vairables

    what is the conditional distribution of variable a, given that u know b and c, if a,b,c obey multivariate normal density?

    Started by statman1‎, 07-31-2016 02:54 AM
    • Replies: 3
    • Views: 200
    07-31-2016, 12:20 PM Go to last post
  11. Probability question

    there are two roads from A to B, and two roads from B to C.each of the four roads has independently probability 1/10 of being blocked by snow.What is...

    Started by osamastat‎, 07-29-2016 10:41 AM
    • Replies: 0
    • Views: 192
    07-29-2016, 10:41 AM Go to last post
  12. conditional expectation given sum

    Hello, I need your help. Suppose: X\sim N(0,\sigma^2_x), Y\sim N(0,\sigma^2_y) , X, Y are independent, and c\in R. I need to find an...

    Started by dan25‎, 07-28-2016 03:58 PM
    • Replies: 0
    • Views: 179
    07-28-2016, 03:58 PM Go to last post
  13. Probabilistic curves study, how to?

    Hi everybody! I am working with severals probability curves and I would like to compare variability between them. Further, I would like to compare...

    Started by joaocampos‎, 07-26-2016 10:16 PM
    • Replies: 0
    • Views: 166
    07-26-2016, 10:16 PM Go to last post
  14. Poisson Distribution - Optimisation

    A store offers a new seasonal product featured. Let N be the random variable which means the number of clients who come to the store during the...

    Started by lalous‎, 07-18-2016 07:43 PM
    • Replies: 1
    • Views: 272
    07-24-2016, 05:14 PM Go to last post
  15. Probability calculation on 2 similar vases with difference in time and backlog

    Hi all, Below is a problem that we find hard to solve, any input would be much appreciated. In short, we're looking for the exact probability...

    Started by McStat‎, 07-21-2016 07:34 AM
    vases time backlog markov
    • Replies: 0
    • Views: 246
    07-21-2016, 07:34 AM Go to last post
  16. Calculating Probabilities

    If a mechanical fault in a car occurs once in every 120 days, and I drive the car 260 days per year, what is the probability of a mechanical fault...

    Started by Rab1‎, 07-09-2016 06:23 AM
    • Replies: 5
    • Views: 324
    07-20-2016, 12:59 PM Go to last post
  17. Mean and Variance - conditional probability

    A public electricity supplier has a number of facilities numbered from 1 to 19. We suppose that for i = 1, 2,..., 19 , installation i produces...

    Started by lalous‎, 07-18-2016 02:00 PM
    • Replies: 0
    • Views: 162
    07-18-2016, 02:00 PM Go to last post
  18. Uniform Distribution / Normal Distribution

    Let the random variable X ~ U ( 0, k ) and Y is a second random variable such as Y | X ~ N ( X , 1). a) Determine the Y density function if k = A ....

    Started by lalous‎, 07-18-2016 10:48 AM
    • Replies: 0
    • Views: 129
    07-18-2016, 10:48 AM Go to last post
  19. Confirmation bias.

    Hello. I am interested in confirmation bias. Specifically I am interested in when a hypotheses can be said to be no longer confirmation bias. ...

    Started by Frankfranky‎, 07-15-2016 06:12 AM
    • Replies: 4
    • Views: 271
    07-15-2016, 08:57 AM Go to last post
  20. Unhappy Conditional Probability - Exam

    Someone can help me please, I need to understand them for my exam on Monday in next week. Today is Saturday.....Thanks a lot..... USING AND...

    Started by begacon‎, 07-28-2007 07:10 PM
    • Replies: 2
    • Views: 19,745
    07-13-2016, 01:00 AM Go to last post
  21. Hypergeometric problem

    Hello everybody! :D I'm new to statistics and I'm struggling with a hypergeometric problem: Suppose I have a drawer with 100 socks in different...

    Started by MindBoggle‎, 07-09-2016 10:54 PM
    hypergeometric
    • Replies: 2
    • Views: 314
    07-10-2016, 01:18 PM Go to last post
  22. Medals at the Olympics

    Hi, I love sports and stats and so I am doing my Olympics research. I saw that there are 2 players from China's on each Badminton competition (MS,...

    Started by Dedes‎, 07-05-2016 04:34 AM
    combinations, olympics, probabilities, sports
    • Replies: 0
    • Views: 294
    07-05-2016, 04:34 AM Go to last post
  23. Probability Problem To Resolve

    Hi, I need the solution to this problem to be able to resolve a situation at work. I believe some probability equation must be involved. ...

    Started by kevin66‎, 06-30-2016 04:19 PM
    • Replies: 2
    • Views: 406
    06-30-2016, 05:12 PM Go to last post
  24. Is this right?

    I'm doing a research paper in international relations and I need some help describing the data. For example, in 13 interventions in civil wars, I...

    Started by datorres85‎, 06-28-2016 08:38 PM
    • Replies: 1
    • Views: 241
    06-30-2016, 02:31 PM Go to last post
  25. What is chance performance cut-off for a 2-part dichotomous response?

    If subjects had to give 2-alternative forced choice responses for a task (Y/N) and then rate the certainty of their response (also 2-alternative...

    Started by ginaj‎, 06-30-2016 04:57 AM
    binomial test, chance level, chance performance
    • Replies: 1
    • Views: 179
    06-30-2016, 02:02 PM Go to last post
  26. New to probability

    Can someone help me solve the following P(0.55≤ z ≤ 1.28). How does one determine a left side vs right side table?

    Started by Cdoss‎, 06-28-2016 09:39 PM
    • Replies: 1
    • Views: 252
    06-29-2016, 12:01 AM Go to last post
  27. Two dice are thrown simultaneously

    Two dice are thrown simultaneously. 1.Find the probability of getting an odd number on the one and a multiple of three on the other. 2.what is the...

    Started by shamsu kano‎, 06-25-2016 06:16 PM
    • Replies: 2
    • Views: 327
    06-26-2016, 11:19 AM Go to last post
  28. Please help!!!

    A group of telephone subscribers is observed continuously during a 80-minute busy hour period. During this time, they make 30 calls, with the total...

    Started by sreenivasan‎, 06-20-2016 08:47 AM
    • Replies: 1
    • Views: 369
    06-20-2016, 08:48 AM Go to last post
  29. distributing labeled balls in unlabel! Statistics for Biological problem,help needed?

    Hello everyone, I am a biology student and i am stuck with a problem, hence here. I have a large number of 10 different kinds of viruses in a tube...

    Started by fz2life‎, 06-17-2016 09:04 PM
    virus_infection_biology
    • Replies: 1
    • Views: 304
    06-20-2016, 03:20 AM Go to last post
  30. Binomial distribution and rolling dice

    I realized this was the homework forum and reposted it in general discussion since mine is not homework.

    Started by XBear‎, 06-17-2016 03:26 PM
    • Replies: 0
    • Views: 197
    06-17-2016, 03:26 PM Go to last post
  31. Probability distribution on next draw from random variable

    I'm working on a game theory model of incomplete information, where players observe certain attributes via noisy signals. I am looking to solve for...

    Started by sundance‎, 02-03-2016 12:45 AM
    • Replies: 1
    • Views: 138
    06-17-2016, 11:55 AM Go to last post
  32. Interpreting the limiting distribution of markov chains?

    Hi all, I have a few questions on the interpretation and application of the steady state or limiting distribution for a markov chain transition...

    Started by Keroro‎, 06-16-2016 07:16 PM
    • Replies: 0
    • Views: 541
    06-16-2016, 07:16 PM Go to last post
  33. Super Bowl Pool Probability Question

    Hey we were trying (and failing) to calculate the odds of winning our super bowl pool at least twice based on the below info: There are 100...

    Started by Probs321‎, 02-12-2016 01:32 AM
    • Replies: 1
    • Views: 353
    06-16-2016, 01:59 PM Go to last post
  34. Obtaining Probability for costs above a certain threshold

    Dear all, I never sought for help on a forum since I feel that many times the answer for a problem can be found if one reads books and searches...

    Started by rashidjelzin‎, 06-09-2016 07:23 AM
    • Replies: 4
    • Views: 423
    06-15-2016, 10:43 AM Go to last post
  35. Paper Notes in a Bag

    Hello all, I have this problem, which I am not fully sure how to solve: In a bag there are 18 paper notes. On five of them there is the digit...

    Started by Yankel‎, 06-15-2016 12:31 AM
    • Replies: 5
    • Views: 271
    06-15-2016, 06:47 AM Go to last post
  36. Hypergeometric problem

    Hello all, I have some problems with this question. Can you assist ? Thanks ! In a cellar there are 3 bottles of wine which are 18 years old, 4...

    Started by Yankel‎, 06-14-2016 03:13 PM
    • Replies: 1
    • Views: 341
    06-14-2016, 04:12 PM Go to last post
  37. Risk Analysis questions

    Hi, I'm new on this forum! I have some question about risk analysis, I'm doing some exercices and I don't understand some points. 1) Limit of...

    Started by AndreT‎, 06-10-2016 03:02 PM
    • Replies: 0
    • Views: 288
    06-10-2016, 03:02 PM Go to last post
  38. Calculating Expected Value of a Continuous Random Variable

    Hell all, I have this distribution function of a random variable X. I wish to find E(X). I have used derivatives to get the density...

    Started by Yankel‎, 06-10-2016 06:41 AM
    • Replies: 1
    • Views: 376
    06-10-2016, 10:58 AM Go to last post
  39. Probability Distribution and Time?

    I saw the attached chart on an optionetics video on youtube and I'm struggling to understand it properly. It's a probability distribution placed...

    Started by tomydom‎, 05-26-2016 08:14 AM
    • Replies: 8
    • Views: 737
    06-09-2016, 11:24 PM Go to last post
  40. Exam tomorrow, urgent help needed.

    Hello, first, im a bulgarian student, my exam is in bulgarian and i translated it to english via google translate, if its not understandable but you...

    Started by skgmdz‎, 06-09-2016 02:55 PM
    • Replies: 1
    • Views: 236
    06-09-2016, 03:27 PM Go to last post
  41. Business Predictability Scheduling Dilemma

    Our business is working to change a longstanding practice of publishing fixed Buy Prices on a Quarterly basis. One of the impacts of this standard...

    Started by jprice33‎, 06-08-2016 09:57 AM
    • Replies: 0
    • Views: 199
    06-08-2016, 09:57 AM Go to last post
  42. Help for an exercise please!

    Hello! I am very confused about something. I am using a software for the reaction time, I have a distribution, mean and standard deviation. and 2...

    Started by itro82‎, 06-04-2016 07:36 AM
    • Replies: 4
    • Views: 381
    06-04-2016, 11:55 PM Go to last post
  43. Joint Density Function From Given Correlation

    How do I find joint density function from a given correlation?

    Started by Vinnie Sappingfield‎, 06-02-2016 09:38 AM
    correlation, joint density function, probabilty
    • Replies: 1
    • Views: 225
    06-02-2016, 01:14 PM Go to last post
  44. Interpretation of likelihood ratio and hypothesis testing

    Even after extensive search, am unclear on some (basic) concepts regarding likelihood vs. frequentist approach in hypothesis testing. Can you...

    Started by natajax‎, 06-02-2016 03:08 AM
    likelihood, likelihood ratio
    • Replies: 0
    • Views: 163
    06-02-2016, 03:08 AM Go to last post
  45. calculating $E(Y)$

    suppose X is random variable non negative with Distribution function F_{X}(x) and Y is random variable with Distribution function...

    Started by hadiSanji‎, 05-31-2016 01:11 PM
    probability
    • Replies: 1
    • Views: 237
    05-31-2016, 01:56 PM Go to last post
  46. Probability Problem - Random variable

    A company wants to improve waste management in its premises . We put a yellow bin for recovering recyclable materials , a brown to recover...

    Started by lalous‎, 05-25-2016 01:03 AM
    • Replies: 5
    • Views: 390
    05-26-2016, 01:41 AM Go to last post
  47. Question Hypothesis test of sample (yes/no) and proportions

    Edit: I'm not sure whether this belongs in statistics or probability forum. Hi guys, I' prepping for exams with old exam questions and I'm...

    Started by BioEngineer‎, 05-25-2016 06:06 PM
    • Replies: 0
    • Views: 201
    05-25-2016, 06:06 PM Go to last post
  48. Probability problem - no idea where to start

    Sorry - my question was poorly written.

    Started by gdsquare‎, 05-25-2016 05:27 PM
    • Replies: 0
    • Views: 193
    05-25-2016, 05:27 PM Go to last post
  49. How to calculate probability of two samples

    Hello everyone, Just need advice how to calculate probability of two samples in a 2 x 4 table. so say i have two groups (brown haired people...

    Started by ANCOVA'D‎, 05-25-2016 11:25 AM
    probability
    • Replies: 0
    • Views: 196
    05-25-2016, 11:25 AM Go to last post
  50. Probability problem - descrete Random variable

    post deleted...

    Started by lalous‎, 05-25-2016 08:32 AM
    random variable
    • Replies: 0
    • Views: 166
    05-25-2016, 08:32 AM Go to last post
  51. Is the order of an event occurs in a sequences of events random?

    I am interested in knowing how to analyse whether the order in which an event occurs within a sequence of events is random; i.e. is the likelihood of...

    Started by Jack Thorley‎, 05-25-2016 06:20 AM
    permutation test, randomisation, sequence data
    • Replies: 0
    • Views: 148
    05-25-2016, 06:20 AM Go to last post
  52. Easy Coin Flip Problem ???

    Hi, I need help. Assume the probability of flipping a coin to heads 20 times in a row is 1:1,000,000 Q: Each day you wake up and flip a coin...

    Started by fergferg‎, 05-15-2016 05:43 PM
    • Replies: 7
    • Views: 593
    05-18-2016, 01:54 PM Go to last post
  53. Roll a Dice (1)

    1. Between two games offered to you, would you rather (i) roll a die once and get paid $1 million for each dot on the upturned face, or (ii) roll a...

    Started by salman123491‎, 05-17-2016 05:28 PM
    • Replies: 1
    • Views: 330
    05-17-2016, 08:21 PM Go to last post
  54. Roll 2 Dice (2)

    2. If you roll 2 fair dice and add the points on each of the upturned face, what is the most likely sum? What is the probability of getting this sum?...

    Started by salman123491‎, 05-17-2016 05:32 PM
    • Replies: 0
    • Views: 214
    05-17-2016, 05:32 PM Go to last post
  55. Probability question

    A teacher says 40% of students study for a specific test. If she randomly selects 5 students, whats the probability that 3 studends did not study for...

    Started by Dnnup‎, 05-16-2016 01:23 PM
    • Replies: 2
    • Views: 264
    05-17-2016, 08:43 AM Go to last post
  56. Question Differences of proportions

    Please forgive what I assume is the simplicity of these related problems, but I don't seem to find the solution elsewhere. 1) 2 cards are...

    Started by WhiskeyJack‎, 05-16-2016 08:52 AM
    • Replies: 0
    • Views: 193
    05-16-2016, 08:52 AM Go to last post
  57. Hotel overbooking task

    Hello together, I am a bit lost with this problem that I need to answer for a university project and I hope someone is able to help me solving...

    Started by SteveF‎, 05-15-2016 09:43 AM
    • Replies: 1
    • Views: 208
    05-15-2016, 03:13 PM Go to last post
  58. should bayes therom be used?

    Seems like a relatively simple question, but I'm missing it: There are 25 delinquent accounts in 100 accounts. If I choose 75 accounts out of the...

    Started by auditor‎, 04-27-2016 09:31 PM
    • Replies: 2
    • Views: 310
    05-15-2016, 06:41 AM Go to last post
  59. Conditional probability of functions. Small question

    Hey, i was just looking at a question where the question is calculate: P( B(t) =< x| x=B(s) ). That is, calculate the probability that B(t) is less...

    Started by andreme91‎, 05-12-2016 06:29 AM
    conditional probability, probability
    • Replies: 0
    • Views: 224
    05-12-2016, 06:29 AM Go to last post
  60. Moments of a random variable involving numerous Binomial Distributions

    I am editing my post because it might have been unclear. Suppose X is a random variable involving 4 binomially distributed random variables: X...

    Started by BobbyRichards‎, 05-06-2016 03:42 PM
    binomial distributions, moments
    • Replies: 6
    • Views: 482
    05-10-2016, 10:59 AM Go to last post

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