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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: 31,161
    09-30-2005, 09:44 AM Go to last post
  1. Markov probability and stock return

    Suppose I have a stock that in in each timeperiod gives a return depending on the state s. Assume that the process starts in s_1 and gives the return...

    Started by JesperHP‎, 10-06-2016 07:38 AM
    • Replies: 0
    • Views: 1,864
    10-06-2016, 07:38 AM Go to last post
  2. Row problem with mandatory empty seats

    Here is the exact question: Suppose that 39 students (you being one of them) are randomly seated in a long row of 120 seats. How likely is it that...

    Started by endlessend25‎, 10-04-2016 03:53 PM
    probability
    • Replies: 1
    • Views: 2,098
    10-06-2016, 01:25 AM Go to last post
  3. "Exploding" Dice Probability (Talk to me like I'm an idiot)

    Hi All, First off, let me just start by saying that my mathematical savvy leaves a lot to be desired. I didn't take a lot of math in school, and...

    Started by RWinnie‎, 10-05-2016 09:01 PM
    • Replies: 1
    • Views: 2,016
    10-06-2016, 01:04 AM Go to last post
  4. Convergence question

    X1, X2,.......Xn is a sequence of random variables. Show that Xn converges to b in quadratic mean if and only if The limit (n approaching...

    Started by greg6363‎, 10-04-2016 08:31 AM
    • Replies: 2
    • Views: 4,289
    10-05-2016, 08:26 AM Go to last post
  5. Lightbulb Racing

    Hi all, I need some help with some statistical work: So, I am trying to understand how I can transform time into probability. I have 2...

    Started by Dedes‎, 10-03-2016 08:48 AM
    betting, normal distribution, probability, time frames
    • Replies: 0
    • Views: 2,249
    10-03-2016, 08:48 AM Go to last post
  6. Conditional Probability

    Hello to everyone. I am new in the forum and in the statistics at all. I have some homework to do and I can't figure it out. I am trying to do those...

    Started by xaocihno‎, 10-01-2016 08:56 AM
    • Replies: 4
    • Views: 2,245
    10-02-2016, 06:10 AM Go to last post
  7. Probability of an attribute in one member of a population

    Wondering whether the following can be calculated (or whether more info is needed). Here's the population: A - 224,000,000 (72.5%) B - ...

    Started by hazelvision‎, 09-27-2016 10:21 PM
    • Replies: 5
    • Views: 2,412
    09-28-2016, 04:03 PM Go to last post
  8. MSc Research Probability Survey

    Hi all, i'm currently in year 2 of a part-time MSc by research into Causal Bayesian Networks at York university; and as part of the study i'm...

    Started by Mark Balmer‎, 09-28-2016 01:52 PM
    • Replies: 0
    • Views: 1,572
    09-28-2016, 01:52 PM Go to last post
  9. Chebyshev's Inequality problem

    Let X ~ Poisson (lambda). With Chebyshev's Inequality, show that P(X >=2 lambda) <= 1/lambda The way I thought to interpret this theorem was...

    Started by greg6363‎, 09-27-2016 12:08 AM
    • Replies: 9
    • Views: 2,740
    09-27-2016, 09:46 PM Go to last post
  10. Probability - help working out a betting probability scenario

    Need a little help and guidance: Tennis match. Player A to hold serve is 85%, Player B to hold serve is 80%. What is the probability that...

    Started by bumbblebee‎, 09-26-2016 09:33 AM
    • Replies: 0
    • Views: 1,426
    09-26-2016, 09:33 AM Go to last post
  11. Probability Questions - Cannot seem to figure out

    I have been working on this problem for a few days now and cannot seem to at least find a formula or example in my book that works. Any help would be...

    Started by LastYearGrad2016‎, 09-23-2016 10:42 PM
    binomial variable, college, probability, values
    • Replies: 2
    • Views: 2,165
    09-24-2016, 10:23 AM Go to last post
  12. Have you seen this formula before

    'Routine to determine the probability of failure given the mean and standard deviation of the capacity and demand. RMinusQ =...

    Started by MamiLamarch‎, 09-22-2016 03:13 AM
    • Replies: 0
    • Views: 1,911
    09-22-2016, 03:13 AM Go to last post
  13. This is a work question. Thanks!

    I am trying to calculate the chances of the wrong number being put in a box. Lets say I have three boxes out of 25 on an assembly line. Each box will...

    Started by mrrenegadebull‎, 09-20-2016 02:21 PM
    • Replies: 2
    • Views: 2,245
    09-21-2016, 08:57 AM Go to last post
  14. Game Probability Question

    Hi, I am playing a game. I win with an 88% chance and lose with 12% probability. If I have won 20 games in a row what is the probabilty that I...

    Started by system2016‎, 09-18-2016 04:17 PM
    game, probability
    • Replies: 4
    • Views: 2,195
    09-18-2016, 11:23 PM Go to last post
  15. Thumbs up Categorizing reasons for predictions in a model

    Hi. I have built a predictive model using decision trees in SPSS modeller. The model predicts which customers are likely to leave based on...

    Started by dz6kb4‎, 09-15-2016 07:16 AM
    • Replies: 0
    • Views: 1,948
    09-15-2016, 07:16 AM Go to last post
  16. Conditioning on more than one event

    Lately, I've been studying conditional probability. I'm working with the following theorems: 1. P(A|B)=P(A,B)/P(B) (the comma represents...

    Started by Buckeye‎, 09-06-2016 06:23 AM
    • Replies: 4
    • Views: 2,124
    09-07-2016, 09:58 PM Go to last post
  17. Question What type of distribution is being described (binomial or poisson)?

    hhhhhhhhjjjj

    Started by georginatz‎, 08-26-2016 02:43 AM
    • Replies: 2
    • Views: 2,988
    08-26-2016, 07:59 AM Go to last post
  18. 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: 2,185
    08-26-2016, 03:07 AM Go to last post
  19. 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: 1,413
    08-25-2016, 08:32 PM Go to last post
  20. 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: 1,243
    08-25-2016, 04:16 PM Go to last post
  21. 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: 1,743
    08-25-2016, 02:56 PM Go to last post
  22. 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: 2,200
    08-14-2016, 01:38 AM Go to last post
  23. 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: 1,524
    08-12-2016, 10:32 AM Go to last post
  24. 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: 1,897
    08-04-2016, 08:27 PM Go to last post
  25. 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: 1,973
    08-02-2016, 05:58 PM Go to last post
  26. 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: 1,744
    07-31-2016, 12:20 PM Go to last post
  27. 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: 2,042
    07-29-2016, 10:41 AM Go to last post
  28. 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: 2,407
    07-28-2016, 03:58 PM Go to last post
  29. 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: 1,768
    07-26-2016, 10:16 PM Go to last post
  30. 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: 1,784
    07-24-2016, 05:14 PM Go to last post
  31. 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: 2,055
    07-21-2016, 07:34 AM Go to last post
  32. 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: 1,197
    07-20-2016, 12:59 PM Go to last post
  33. 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: 1,121
    07-18-2016, 02:00 PM Go to last post
  34. 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: 1,394
    07-18-2016, 10:48 AM Go to last post
  35. 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: 2,213
    07-15-2016, 08:57 AM Go to last post
  36. 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: 30,917
    07-13-2016, 01:00 AM Go to last post
  37. 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: 2,249
    07-10-2016, 01:18 PM Go to last post
  38. 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: 1,740
    07-05-2016, 04:34 AM Go to last post
  39. 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: 1,372
    06-30-2016, 05:12 PM Go to last post
  40. 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: 1,334
    06-30-2016, 02:31 PM Go to last post
  41. 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: 946
    06-30-2016, 02:02 PM Go to last post
  42. 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: 2,307
    06-29-2016, 12:01 AM Go to last post
  43. 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: 1,716
    06-26-2016, 11:19 AM Go to last post
  44. 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: 1,439
    06-20-2016, 08:48 AM Go to last post
  45. 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: 1,385
    06-20-2016, 03:20 AM Go to last post
  46. 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: 1,203
    06-17-2016, 03:26 PM Go to last post
  47. 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 01:45 AM
    • Replies: 1
    • Views: 1,118
    06-17-2016, 11:55 AM Go to last post
  48. 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: 1,583
    06-16-2016, 07:16 PM Go to last post
  49. 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 02:32 AM
    • Replies: 1
    • Views: 1,483
    06-16-2016, 01:59 PM Go to last post
  50. 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: 1,728
    06-15-2016, 10:43 AM Go to last post
  51. 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: 1,480
    06-15-2016, 06:47 AM Go to last post
  52. 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: 1,170
    06-14-2016, 04:12 PM Go to last post
  53. 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: 1,175
    06-10-2016, 03:02 PM Go to last post
  54. 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: 3,353
    06-10-2016, 10:58 AM Go to last post
  55. 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: 2,102
    06-09-2016, 11:24 PM Go to last post
  56. 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: 2,425
    06-09-2016, 03:27 PM Go to last post
  57. 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: 1,371
    06-08-2016, 09:57 AM Go to last post
  58. 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: 1,406
    06-04-2016, 11:55 PM Go to last post
  59. 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: 1,435
    06-02-2016, 01:14 PM Go to last post
  60. 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: 834
    06-02-2016, 03:08 AM Go to last post

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