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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: 30,349
    09-30-2005, 09:44 AM Go to last post
  1. Median and Mean of Independent Random Variables

    Hello, Here is the question: Let X_1,X_2, . . . ,X_n be random variables with the density \frac{1}{1+x^2} for x \in ({-\infty},{\infty}) ;...

    Started by Matt M‎, 12-22-2010 12:32 PM
    • Replies: 5
    • Views: 8,408
    07-08-2012, 09:54 AM Go to last post
  2. Deriving posterior probability from frequencies

    I'm working through an introductory Bayesian stats text: Doing Bayesian Analysis. Having been away from stats for a while and having never working...

    Started by davidbgonzalez‎, 03-02-2011 07:13 PM
    bayesian, probability question
    • Replies: 5
    • Views: 3,594
    11-29-2012, 01:15 PM Go to last post
  3. Probability Question

    Question 1: Suppose that in a weekly lottery you have probability .02 of winning a prize with a single ticket and that you buy 1 ticket per week...

    Started by jenn.sf‎, 10-19-2011 10:56 AM
    • Replies: 5
    • Views: 3,417
    10-19-2011, 03:46 PM Go to last post
  4. Classical Probability

    Greetings from new comer! Here is my question I could not figure it out by myself: There are two types of bags H and R in a single box (black box...

    Started by yifang‎, 10-06-2011 03:59 PM
    classical bayesian, probability estimate
    • Replies: 5
    • Views: 2,423
    10-06-2011, 08:09 PM Go to last post
  5. I need some help with Probability Problem.

    The local barber shop is home to three barbers, 1, 2, and 3. The barbers appear identical but vary in their ability to provide good haircuts. The...

    Started by no1stu‎, 10-08-2011 11:29 AM
    • Replies: 5
    • Views: 3,806
    10-09-2011, 01:53 AM Go to last post
  6. Probabilty Question

    I am looking at 6 events. The probabilities of each occuring independantly are as follows: Event 1- 7% Event 2- 4% Event 3- 7% Event 4- 4%...

    Started by rhhudson‎, 10-18-2011 02:41 PM
    • Replies: 5
    • Views: 3,337
    10-19-2011, 03:46 AM Go to last post
  7. Independent Event if A is a subset of B ???

    I have a questions regarding Conditional Probability. Two events A and B are independent if: P(AnB)=P(A)*P(B) Is this always the case or are...

    Started by Mats Marquardt‎, 10-23-2011 12:27 PM
    independent events
    • Replies: 5
    • Views: 15,839
    10-23-2011, 04:55 PM Go to last post
  8. Can someone explain how to solve this simple problem?

    Your favorite team is in the World Series. You have assigned a probability of 63% that they will win the championship. Past records indicate that...

    Started by ekkakub‎, 10-26-2011 07:39 PM
    • Replies: 5
    • Views: 6,236
    10-26-2011, 09:10 PM Go to last post
  9. Difficult probability question

    Hi - I'm really stuck with this question. I can't find any example quite like it anywhere: Two friends, Ben and Jerry, agree to a random swap of...

    Started by Dojo‎, 10-28-2011 10:59 AM
    • Replies: 5
    • Views: 3,297
    10-28-2011, 11:42 AM Go to last post
  10. maximum of parabola

    Hi who determine maximum of parabola? thanks

    Started by asangari‎, 11-07-2011 11:20 AM
    • Replies: 5
    • Views: 3,452
    11-07-2011, 12:14 PM Go to last post
  11. Special interest groups want my money

    and they say that they lobbied for so-and-so bill and it passed and so I am to conclude that they are effective. Aside from a controlled...

    Started by Outlier‎, 11-28-2011 07:21 PM
    • Replies: 5
    • Views: 2,146
    11-29-2011, 11:54 AM Go to last post
  12. multinomial

    by using multinomial distribution: p=N!/M1!M2!M3! *P1^M1*P2^M2*P3^M3 P1=10^-5*5000=0.05 (fail to deploy on activation with a 10^5 probability)...

    Started by Matt‎, 12-07-2011 01:34 PM
    • Replies: 5
    • Views: 2,389
    12-08-2011, 07:09 AM Go to last post
  13. almost sure convergence

    Hi, I've got this question I'm trying solve for days already. Let Xn be random variable = 2 with prob 1/3 and = 1/2 with prob 2/3 Let Zn be...

    Started by chchamp‎, 01-12-2012 01:38 PM
    • Replies: 5
    • Views: 4,291
    01-13-2012, 04:20 AM Go to last post
  14. Question Its easy for you pros, but i need help anyways!

    I have a simple stats/probability question. I need a formula to calculate probability of death. Lets say 20% of people with cancer will die this...

    Started by mathStudent‎, 12-15-2011 03:15 PM
    logistic, probability, regression, statistics
    • Replies: 5
    • Views: 2,196
    12-16-2011, 11:23 AM Go to last post
  15. What is the number of combinations for a 6XN combination lock?

    Hi, does anyone know how to calculate the total number of combinations a 6XN combination lock .i.e. each of the 6 wheel columns has N possible...

    Started by coolcat‎, 12-26-2011 11:39 AM
    • Replies: 5
    • Views: 1,910
    12-26-2011, 02:02 PM Go to last post
  16. pdf less than cdf

    Let us consider the standard normal distribution. For most of the negative values the cdf is less than the pdf. eg. cdf(-1)=0.15 while pdf(-1)=0.24....

    Started by jrai‎, 01-13-2012 02:11 AM
    • Replies: 5
    • Views: 2,750
    01-13-2012, 01:58 PM Go to last post
  17. quick question: probability of being dealt a royal flush?

    if you have a standard deck of cards and are dealt 5 cards randomly, what are the chances of getting a royal flush? i feel like this is pretty...

    Started by Rhodo‎, 01-30-2012 02:04 PM
    • Replies: 5
    • Views: 8,638
    02-02-2012, 05:57 PM Go to last post
  18. [SOLVED] New to Probability

    Hello! I am taking my first stats course in University, and I am normally pretty good with number (finished with A+s in linear algebra, and...

    Started by HHPS‎, 02-01-2012 09:58 PM
    • Replies: 5
    • Views: 4,281
    02-01-2012, 11:17 PM Go to last post
  19. Defining parameter following survival function

    I am a newbie, with limited statistical skills, so please excuse/correct basic mistakes. My question is about the characteristics of a...

    Started by Iphix‎, 02-09-2012 03:08 AM
    • Replies: 5
    • Views: 1,785
    02-09-2012, 02:10 PM Go to last post
  20. Building a Multivariate Poission Distribution....

    hello peeps. i know i haven't posted in like ages but i've been very, very VERY busy lately so i hope i get more time once the semester ends. ...

    Started by spunky‎, 03-16-2012 11:26 AM
    • Replies: 5
    • Views: 3,072
    03-16-2012, 01:03 PM Go to last post
  21. 97th percentile

    "suppose the moisture content per pound of a dehydrated protein concentrate is normally distributed with a mean of 3.5 and standard deviation of 0.5....

    Started by kelly g‎, 03-26-2012 08:36 PM
    • Replies: 5
    • Views: 7,542
    03-26-2012, 10:34 PM Go to last post
  22. null hypothisis and p value

    This is my question; A medical Researcher knows that the generally accepted level for Triglycerides in Adult Males is 110 mg/dl. Fearing that men...

    Started by bamfje@gmail.com‎, 04-02-2012 02:52 PM
    • Replies: 5
    • Views: 2,598
    04-02-2012, 03:45 PM Go to last post
  23. Can't understand what this question means

    Let X and Y have exponential distributions Exp(3) (i.e, with the parameter 3) We assume that X and Y are independent. Let U=x+2Y and V=-x+Y....

    Started by saternal‎, 04-03-2012 08:35 AM
    • Replies: 5
    • Views: 1,987
    04-05-2012, 07:23 AM Go to last post
  24. dice probability

    Started by juantheron‎, 04-12-2012 03:20 AM
    • Replies: 5
    • Views: 1,662
    04-13-2012, 05:01 AM Go to last post
  25. Bimonial aggregation

    Hi, I'll try to keep this brief. I'm having troubles working with the binomial for a sporting event. Here's a totally simplified and fictional...

    Started by iambasil‎, 04-12-2012 05:21 AM
    • Replies: 5
    • Views: 2,037
    04-12-2012, 09:05 AM Go to last post
  26. discrete approximation of a normal distribution

    Hi, i have a normal distribution \mu=10, \sigma=1 and need a discrete approximation of it in order to calculate e.g. P(X=8). How can i...

    Started by knild‎, 04-16-2012 09:33 AM
    • Replies: 5
    • Views: 7,378
    04-16-2012, 11:05 AM Go to last post
  27. Poisson or Binomial

    Hi, im trying to make sure i have the difference between when to use Binomial and Poisson distributions firmly understood. Regarding the following...

    Started by Hans Rudel‎, 05-01-2012 07:44 AM
    binomial distribution, poisson distribution
    • Replies: 5
    • Views: 9,502
    05-03-2012, 08:19 AM Go to last post
  28. Is independence indpendent on measure?

    Is it possible that 2 sigma-algebras could be independent under one measure but not independent under another? Many thanks.

    Started by tuna‎, 05-25-2012 11:53 AM
    • Replies: 5
    • Views: 1,999
    05-25-2012, 04:16 PM Go to last post
  29. Adding normal distribution - z-scores

    Hi - I have a quick question. I understand that the sum of two normal distributions is a normal distribution. Now let's say I have the z-score...

    Started by kurt9090‎, 06-05-2012 07:36 AM
    • Replies: 5
    • Views: 8,643
    06-05-2012, 09:21 AM Go to last post
  30. random variables - expected value of time taken to perform a service

    Hello everyone, My name is Alex, I am from Spain and I need help. I am not trained in statistics and all I know is a little bit from school and...

    Started by Mexikano‎, 07-26-2012 11:16 AM
    • Replies: 5
    • Views: 2,032
    07-31-2012, 01:35 AM Go to last post
  31. Joint Distribution

    Hi,I need some help here: Toss a fair coin twice. Define X,Y and Z as : X=1 if HH or HT X=0 if TH or TT Y=1 if HH or TH Y=0 if HT or TT

    Started by violette‎, 07-28-2012 12:31 AM
    • Replies: 5
    • Views: 1,933
    08-01-2012, 08:03 PM Go to last post
  32. Name for the expression E(Y|X)*Prob(X)

    I am working with a term which is an expectation conditional on an event, multiplied by the probability of the event occuring. For example,...

    Started by Leo Simon‎, 09-07-2012 07:05 PM
    conditional expectation
    • Replies: 5
    • Views: 2,235
    09-12-2012, 07:56 PM Go to last post
  33. Predicting probability with standard deviations, mean high and low values.

    I registered on this forum specifically to ask this question. This is not homework, it's simply a for fun/hobby problem I am trying to solve. This...

    Started by Cuda1337‎, 08-22-2012 04:59 PM
    • Replies: 5
    • Views: 5,244
    06-14-2013, 03:55 AM Go to last post
  34. Help Needed In Solving For Mean of Normal of CDF

    (My stats are a bit rusty so please forgive my clumsy notation and terminology.) Okay so given values for A,B and a probability p: p*F(A;mu,1)...

    Started by jacobcdf‎, 09-04-2012 11:46 AM
    • Replies: 5
    • Views: 1,957
    09-04-2012, 01:01 PM Go to last post
  35. Probability, American airlines!

    North American Airlines, on average, delivers three quarters of their flights to the arrival gate within 15 minutes of schedule in august 2012. ...

    Started by Nellen2222‎, 09-29-2012 02:30 PM
    • Replies: 5
    • Views: 1,789
    09-29-2012, 04:49 PM Go to last post
  36. Cell phone mean and standard deviation

    A recent study "privacy and data management on mobile decies"the pew research center, Showed that 18.6% had their location tracking feature turned...

    Started by Neelo‎, 09-29-2012 02:57 PM
    • Replies: 5
    • Views: 2,667
    09-29-2012, 03:38 PM Go to last post
  37. Poisson distribution question on lambda

    An office printer has a paper jam on average 2 times in 3 weeks. THe number of paper jamsfollows a poisson distribution Findd the probabilitythat...

    Started by Nellen2222‎, 10-07-2012 08:31 PM
    • Replies: 5
    • Views: 2,714
    10-08-2012, 06:32 AM Go to last post
  38. Help!!

    In a recent survey about appliance ownership, 58% of the respondents indicated that they own Maytag appliances, while 24% indicated they own GE...

    Started by lonerider‎, 10-20-2012 11:30 PM
    • Replies: 5
    • Views: 4,626
    10-21-2012, 10:34 PM Go to last post
  39. Time Independent Poisson Regression

    Hi there, I'm new to all this and am looking for an explanation in Layman's Terms Level 1 (level 1 being your average primate.....level 10 being a...

    Started by CardiffCasual‎, 11-02-2012 12:02 PM
    • Replies: 5
    • Views: 4,649
    11-03-2012, 02:30 PM Go to last post
  40. Hypothetical scenario for probability? How would you solve this?

    So here's a hypothetical scenario: From one source (let's call it A), the probability of the color red is 0.2 and orange is 0.8. From a second...

    Started by Hco417‎, 10-24-2012 02:22 PM
    probability
    • Replies: 5
    • Views: 2,223
    10-24-2012, 03:25 PM Go to last post
  41. Question VERY rusty tutor (for statistics, anyway) needs help to teach student!

    I haven't done statistics for well over a decade and I'm known the family as the math tutor because I previously brought my wife's cousin up from an...

    Started by Math_Tutor‎, 04-28-2013 04:28 PM
    • Replies: 5
    • Views: 1,597
    04-29-2013, 10:42 AM Go to last post
  42. Extremely Simple Probability Calculation

    I am working on a project (non-school, non-homework, math for fun :D) in which I need to determine a fairly simple probability. I need to determine...

    Started by athingonetime‎, 12-08-2012 12:31 AM
    probability
    • Replies: 5
    • Views: 1,202
    12-08-2012, 04:22 PM Go to last post
  43. Determining the probability that two data sources are the same

    I've been looking for the answer to this problem for a while now and I think a large part of it is that I don't know how to frame the question. Here...

    Started by TommyJimmy‎, 01-03-2013 09:43 AM
    • Replies: 5
    • Views: 2,020
    05-10-2013, 03:50 AM Go to last post
  44. Complex question of combinatorial probability

    I would like to know if an equation exists or can be defined for computing the probability of drawing (at random from a population of elements) all...

    Started by Pwestcitt‎, 12-23-2012 04:17 AM
    • Replies: 5
    • Views: 1,621
    12-25-2012, 05:32 AM Go to last post
  45. Ratio of two independent gamma random variables

    Hello, I am working on a problem in which I need to find the expectation of the square root of the ratio of two independent gamma random variables...

    Started by GTaiko‎, 01-16-2013 10:40 PM
    • Replies: 5
    • Views: 6,404
    01-17-2013, 10:44 AM Go to last post
  46. Help With Potential Textbook Error

    I'm reading through the statistics chapter in my research methods textbook and think I may have found a mistake. I was hoping someone here could...

    Started by vw2000‎, 02-19-2013 06:06 PM
    • Replies: 5
    • Views: 796
    02-20-2013, 11:15 AM Go to last post
  47. Having trouble with an expected value manipulation

    I'm having a little trouble with part a. Okay, okay, I'm having trouble with all of it, but I'm guessing that solving a will help with the rest....

    Started by alice9725‎, 01-31-2013 03:25 AM
    • Replies: 5
    • Views: 2,745
    01-31-2013, 10:54 PM Go to last post
  48. Sequence probability, need a cross-check

    This is not a homework problem so, I don't have a grader or a TA to assist. Short problem: In a randomly generated 5 digit number (including...

    Started by DKATyler‎, 04-05-2013 06:59 PM
    • Replies: 5
    • Views: 1,770
    05-02-2013, 01:34 PM Go to last post
  49. Expectation/probability question (sorta like Craps, maybe?)

    I'll try to be as brief as possible: I have a number of events that can happen, say e1, e2...eN. N isn't particularly large. Each event has a...

    Started by montalbon‎, 12-27-2012 02:54 AM
    closed form, error rate, expectation, probability
    • Replies: 5
    • Views: 2,248
    12-28-2012, 03:05 AM Go to last post
  50. Discrete Optimization Question

    1. The problem statement 9. This is a simplified inventory problem.Suppose that it costs c dollars to stock an item and that the item sells for s...

    Started by gajohnson‎, 02-13-2013 11:03 PM
    • Replies: 5
    • Views: 3,277
    02-15-2013, 12:48 PM Go to last post
  51. Proportion and Expected

    The Proportion of college student who take Stats is P=.22 A)If 200 college students are selected at randon, how many would you expect to take...

    Started by PSG‎, 05-11-2013 05:30 PM
    • Replies: 5
    • Views: 1,529
    05-11-2013, 09:50 PM Go to last post
  52. Different arrangments of n 0's and m 1's

    This simply stated problem is giving me some trouble: How many different ways can I arrange n 0's and m 1's? Perhaps someone would direct me...

    Started by BigBugBuzz‎, 06-05-2013 05:56 PM
    combinations
    • Replies: 5
    • Views: 1,670
    06-06-2013, 05:54 AM Go to last post
  53. how did Komogorov's Probability axioms became axioms?

    i was reviewing some of my notes on real analysis yesterday and started thinking about something my prof said the first day. he commented on how...

    Started by spunky‎, 07-30-2013 02:31 PM
    • Replies: 5
    • Views: 3,237
    07-30-2013, 05:46 PM Go to last post
  54. counting probability

    i need some help counting probability using Bayes theorem given that 1/10 of message is a spam message. spam detector will correct identify a...

    Started by zxcvbnm123‎, 07-24-2013 03:03 PM
    • Replies: 5
    • Views: 2,099
    07-28-2013, 09:27 AM Go to last post
  55. Inquisitive son problem!

    Hi, I'm not sure if this is the right place to post but here goes... My son and myself have been building a quincunx machine as part of a project...

    Started by nosduha‎, 07-16-2013 03:01 PM
    • Replies: 5
    • Views: 1,877
    07-21-2013, 02:35 PM Go to last post
  56. Poisson distribution problem

    Hello everybody, Im needing some help with the following problem: The number of defects every 100meters responds to a Poisson distribution with...

    Started by fededem‎, 07-04-2013 06:16 PM
    • Replies: 5
    • Views: 1,493
    07-05-2013, 12:38 PM Go to last post
  57. Birthday problem using Bernoulli trails

    I came up with this problem: What is the approximate probability that no two people in a group of seven have the same birthday? So, I set up...

    Started by vxs8122‎, 09-02-2013 02:54 PM
    • Replies: 5
    • Views: 2,903
    09-02-2013, 03:36 PM Go to last post
  58. Generalizability of results / External validity

    Hi everyone, Employment of probability sampling to draw a sample from the population in a quantitative study (cross-sectional design, data...

    Started by Renāta‎, 09-19-2013 09:08 AM
    inference, sample population, validity
    • Replies: 5
    • Views: 3,476
    09-19-2013, 11:59 AM Go to last post
  59. Help with cdf

    I'm having trouble with grasping cdf's. If I have a cumulative distribution function F(x) = .0 ----- x<-2 ...

    Started by bigbob‎, 10-06-2013 04:53 PM
    cdf, cdf technique
    • Replies: 5
    • Views: 1,719
    10-07-2013, 12:12 PM Go to last post
  60. Bounded in Probability proof

    Hi all, I could use some help understanding the following proof so please feel free to pitch in! Consider any random variable X with...

    Started by JohnK‎, 10-01-2013 06:51 PM
    • Replies: 5
    • Views: 4,677
    10-02-2013, 11:32 AM Go to last post

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