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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: 30,262
    09-30-2005, 09:44 AM Go to last post
  1. Can I Know The Difference and A Couple of Questions

    Mean 266 Days STD=16 Days Question 1- What is the probability that a random sample of 20 pregnancies that has a mean gestation period of 260...

    Started by PSG‎, 03-29-2013 03:41 PM
    • Replies: 2
    • Views: 1,738
    03-30-2013, 12:00 AM Go to last post
  2. Need help with nCk

    solved...thread can be trashed.

    Started by ethunnn‎, 03-24-2013 08:42 PM
    • Replies: 6
    • Views: 2,383
    03-29-2013, 09:00 PM Go to last post
  3. Expected Value of Convolution

    I am interested in estimating E where... - X ~ Normal(mu,sigma) - h(.) = CDF of Standard Normal distribution - g(.) = inverse CDF of Beta...

    Started by jcoull‎, 03-25-2013 02:35 PM
    convolution, expected value
    • Replies: 3
    • Views: 5,155
    03-28-2013, 10:21 AM Go to last post
  4. Thumbs up Parking lot probability

    Suppose there is a parking area which has parking lot for 24 cars. Each car is given its own parking lot . Suppose , on a particular day , 1st car...

    Started by vishalgupta.nitb‎, 03-28-2013 07:33 AM
    • Replies: 1
    • Views: 2,637
    03-28-2013, 08:45 AM Go to last post
  5. Probability related to cards problem

    This question i am trying to solve. Q. A prisoner in a Kafkaesque prison is put in the following s ituation. A regular deck of 52 cards is placed...

    Started by vickyhader‎, 03-26-2013 03:34 AM
    cards problem
    • Replies: 2
    • Views: 2,028
    03-27-2013, 03:55 PM Go to last post
  6. Probability of simply "guessing" in a Blind Triangle taste test

    Hi, I am a new member to these forums and I have a problem thatís been bugging me. A huge thank you for any help with this one. Itís an odd one. I...

    Started by AnRyan‎, 03-25-2013 10:57 AM
    • Replies: 3
    • Views: 4,102
    03-27-2013, 10:19 AM Go to last post
  7. Calculate Probability of a value greater than knowing the Mean, St Deviation...?

    I need to Calculate the probability of get 20000 or more with the following statistics; Statistics: Forecast values Trials 5,000 Base...

    Started by eduardo081092‎, 03-27-2013 01:49 AM
    confidence, deviation, interval, probabilities, probability
    • Replies: 1
    • Views: 2,309
    03-27-2013, 02:58 AM Go to last post
  8. how to calculate?

    Thank you i have find the solution.

    Started by people‎, 03-26-2013 11:42 AM
    • Replies: 2
    • Views: 1,984
    03-26-2013, 12:08 PM Go to last post
  9. Bounded in Probability

    Hello everyone, I am interested in the following problem: Let the sequence of random variables Xt, t=1,2,...n be bounded in probability, in...

    Started by VanessaSpotifyOne‎, 03-25-2013 04:30 PM
    • Replies: 1
    • Views: 3,755
    03-26-2013, 03:24 AM Go to last post
  10. Probability table needs double checking

    solved...thread can be trashed.

    Started by ethunnn‎, 03-25-2013 12:55 PM
    • Replies: 6
    • Views: 1,764
    03-26-2013, 12:02 AM Go to last post
  11. Proof

    How do we prove with induction that the convolution of n exponentional probability density functions is \frac{x^{n-1}}{(n-1)!}e^{-x}u(x) ,where...

    Started by Toyo‎, 03-25-2013 03:42 AM
    • Replies: 3
    • Views: 1,861
    03-25-2013, 04:48 AM Go to last post
  12. Find probability density function

    Hi guys, I have this exercise and i don't know where do i have to start.. Let the random variable Y be defined by the following sum which...

    Started by Toyo‎, 03-22-2013 12:40 PM
    law of total probability, sum of random n terms
    • Replies: 2
    • Views: 1,286
    03-25-2013, 03:27 AM Go to last post
  13. Relating the average of n samples from lognormal distribution back to the median

    Hi All, I have a situation where we are sampling the average of n outcomes (typically 2-5 samples) from a lognormal distribution. The result is a...

    Started by vinomarky‎, 03-23-2013 11:37 PM
    • Replies: 1
    • Views: 2,246
    03-24-2013, 06:27 AM Go to last post
  14. Probability calculation problem for a ranked set sample

    Let us consider a case where a ranked set sampling scheme from $n^2$ subjects has been adopted. There are a total of $n$ RSS blocks. So each RSS...

    Started by Blain Waan‎, 03-23-2013 03:12 AM
    probability question, probability theory, probablity
    • Replies: 1
    • Views: 2,325
    03-23-2013, 01:53 PM Go to last post
  15. Finding probability with given mean and standard deviation

    Hi, I have tried to do this using the z value method but I'm not even sure if I'm right. The question is: "The recommended total blood cholesterol...

    Started by k1mpossible‎, 03-19-2013 05:14 AM
    probability help, statistics course
    • Replies: 4
    • Views: 10,256
    03-23-2013, 12:42 PM Go to last post
  16. Geometric and independence

    Hi, New to this forum here. I have attached an interesting question that involves geometric distribution and independence. 3 Questions in all. ...

    Started by meeksoup‎, 03-20-2013 08:21 PM
    • Replies: 6
    • Views: 2,368
    03-23-2013, 12:42 PM Go to last post
  17. Poisson Distribution

    A telephone company's goal is to have no more than six monthly line failures on any 150 miles of line. The company currently experiences an average...

    Started by duykhanh992‎, 02-08-2013 05:23 PM
    • Replies: 3
    • Views: 2,056
    03-22-2013, 06:23 AM Go to last post
  18. Please help!!!

    I am working on a problem and need help, if I am given a probability of .6 that I will be given ice cream, a .7 probability that I will get either...

    Started by hinni23‎, 03-15-2013 05:26 PM
    • Replies: 2
    • Views: 1,038
    03-20-2013, 01:59 PM Go to last post
  19. Question Odds of winning a race given the odds of each runner beating each opponent?

    Hi, Say we have three runners: A, B and C, and we have the probability of each runner beating each individual opponent: A before B: 0.68 A...

    Started by juanmejgom‎, 03-15-2013 04:41 AM
    independent, odds, race, statistics
    • Replies: 3
    • Views: 1,460
    03-20-2013, 01:54 PM Go to last post
  20. Help me Solve Probability problem

    A purchaser of auto components buys them in lots of size 10. It is his policy to inspect 3 components randomly from a lot and to accept the lot only...

    Started by sachinner‎, 03-20-2013 12:32 PM
    • Replies: 1
    • Views: 1,682
    03-20-2013, 12:54 PM Go to last post
  21. If I roll a 4-sided die 400 times, what's the chance of getting 113 or more 1s?

    Hi, I'm not a mathematician, so apologies if this is a beginnerish question. I've been running a small parapsychology test with my friends,...

    Started by Joleel‎, 03-19-2013 09:55 PM
    • Replies: 2
    • Views: 2,203
    03-20-2013, 08:30 AM Go to last post
  22. Could you help me out with this function please?

    Hello everyone. I am currently working with this stochastic function in a dynamic model simulation: N(t) such that N(0)=1 In every time step...

    Started by manu_jm‎, 03-11-2013 10:41 AM
    • Replies: 3
    • Views: 2,118
    03-19-2013, 08:25 AM Go to last post
  23. Question Calculating Random Numbers with a Negative Correlation (Monte Carlo)

    I'm trying to create a set of random, lognormal distributed, negatively correlated numbers from several P90, P50 and P10 inputs. Creating sets of...

    Started by Geezer‎, 03-19-2013 03:52 AM
    • Replies: 1
    • Views: 2,632
    03-19-2013, 08:19 AM Go to last post
  24. how to find probability with percentages?

    Say i have 25% of the sodas are pepsi and there are a certain number of those pepsi's with a special code under the cap how could i find the...

    Started by FoxTrot049r‎, 03-17-2013 11:54 AM
    • Replies: 4
    • Views: 18,649
    03-17-2013, 05:19 PM Go to last post
  25. I have a probability question!

    help please.. I don't know how to find P(x) The BREAKOUT OF FACULTY MEMBERS FROM THE MS&E Divison Suppose that three faculty members are chosen...

    Started by ptrrr‎, 10-13-2010 03:10 PM
    • Replies: 12
    • Views: 4,074
    03-17-2013, 11:07 AM Go to last post
  26. Help!! Nice problem!

    You are holding a party at home, and everyone is about to participate in the following game. Each person will write their name on a card. All the...

    Started by lucik‎, 03-15-2013 05:39 PM
    • Replies: 2
    • Views: 2,483
    03-16-2013, 02:57 AM Go to last post
  27. Poisson process in 3D

    I haven't the slightest idea of how to tackle the following problem. Find the probability density for the distance from an event to its nearest...

    Started by Kiuhnm‎, 03-15-2013 10:16 AM
    poisson process
    • Replies: 1
    • Views: 6,272
    03-15-2013, 03:11 PM Go to last post
  28. Multi-choice, out of time

    Hi In a multi-choice test with four answers each, I answer the first 75% but run out of time for the rest. In the few minutes left which is the best...

    Started by Alven99‎, 03-14-2013 11:55 AM
    • Replies: 4
    • Views: 1,876
    03-14-2013, 09:20 PM Go to last post
  29. Bernoulli Trials

    Background: I play a game in which a lot of things are determined by random events. Many things work like simple Bernoulli trials (you make an...

    Started by fissile‎, 03-14-2013 02:14 PM
    • Replies: 1
    • Views: 1,924
    03-14-2013, 03:14 PM Go to last post
  30. need pointers to the right direction...

    A tyre company has invented a revolutionary new product. In order to overcome consumer resistance a mileage guarantee is offered with the tyre. Road...

    Started by gigovv‎, 03-14-2013 11:06 AM
    • Replies: 6
    • Views: 1,875
    03-14-2013, 11:53 AM Go to last post
  31. Please Solve!

    Over the last 10 years, a company's annual earnings increased from the previous year seven times and decreased from the previous year three times....

    Started by gigovv‎, 03-14-2013 09:36 AM
    • Replies: 3
    • Views: 2,138
    03-14-2013, 10:19 AM Go to last post
  32. Please someone help me to solve. Thanks !!!

    A panel of jurors consists of 16 persons who have had no education beyond high school and 10 who have had some college education. If a lawyer...

    Started by gigovv‎, 03-14-2013 07:23 AM
    • Replies: 4
    • Views: 1,298
    03-14-2013, 10:19 AM Go to last post
  33. Probability Question from Boss

    We received this question from our boss, he said there would be a prize to the first person to answer it. I submitted my response and he said I was...

    Started by senorpi‎, 02-14-2013 11:04 AM
    • Replies: 8
    • Views: 1,287
    03-14-2013, 09:59 AM Go to last post
  34. Deriving Var from mu and two Ps

    If I know the mean of a normal distribution and two probabilities F1=P(Z>z1) and F2=P(Z>z2), I should be able to derive the Var of the distribution,...

    Started by billylyman‎, 03-13-2013 12:53 PM
    cdf, gaussian distribution, normal
    • Replies: 2
    • Views: 1,462
    03-13-2013, 02:03 PM Go to last post
  35. Simulating a probability, use a random number?

    Hello, I looking for some advice for a simulation. I know that when an electric car arrives at a destination there is a 70% chance that a...

    Started by bradyj2‎, 03-04-2013 04:29 PM
    • Replies: 3
    • Views: 1,121
    03-09-2013, 01:13 PM Go to last post
  36. Using the F distribution to find a probability

    Ok so here is my question and the steps I have taken: Question: If X and Y are independent random variables having chi-square distributions...

    Started by siope1kd‎, 03-08-2013 03:09 PM
    chi-square, f distribution, probability
    • Replies: 3
    • Views: 2,820
    03-08-2013, 04:51 PM Go to last post
  37. Use Normal Distribution and Chi-square distribution

    My question is as follows: If X and Y are independent random variables, X has a normal distribution with mean 2 and variance 4, and Y has a...

    Started by siope1kd‎, 03-07-2013 11:55 PM
    chi-square, normal distribution, probability
    • Replies: 8
    • Views: 1,949
    03-08-2013, 01:41 AM Go to last post
  38. Kind of Lost.. Some Help Please.

    A committee consists of four women and three men. The committee will randomly select two people to attend a conference in Hawaii. Find the...

    Started by PSG‎, 03-04-2013 10:44 PM
    • Replies: 4
    • Views: 2,065
    03-05-2013, 12:10 AM Go to last post
  39. Find Probability between +/- 10% from the mean and 95% Confidence Interval

    Hi, I have the estimated prices of homes in a certain area (n=50). I also have the 95% Confidence Interval (upper/lower bounds). How would I find...

    Started by podarum‎, 03-03-2013 11:15 PM
    • Replies: 0
    • Views: 1,284
    03-03-2013, 11:15 PM Go to last post
  40. Combination probability of variables that are not independent

    Hello, I'm hoping I might be able to get some help in creating a forecasting model (in sports) looking at 2 variables that are not independent of...

    Started by iambasil‎, 03-02-2013 08:39 PM
    • Replies: 0
    • Views: 1,204
    03-02-2013, 08:39 PM Go to last post
  41. what's the name and formula for this prob theory?

    Hello - Can you please help me with the following?: You have 2 independent events, each with a 75% probability of success. What is the...

    Started by random512‎, 03-01-2013 10:38 PM
    • Replies: 2
    • Views: 1,413
    03-02-2013, 02:47 AM Go to last post
  42. Probability of electric car recharging

    Hi, I'm reading a paper which calculates the probability of an electric car re-charging. Data has been recorded from a car. There are 2 types of...

    Started by bradyj2‎, 03-01-2013 06:16 AM
    • Replies: 4
    • Views: 1,153
    03-01-2013, 10:19 AM Go to last post
  43. How to do cumulative confidences from child objects to a parent object?

    Hi I need some help with cumulative confidences. For example. I have 5 shops, each forecasting to sell x number of TABLET PCs by the end of the...

    Started by Darshik‎, 02-28-2013 08:05 AM
    aggregating confidences, cumulative confidences
    • Replies: 4
    • Views: 1,253
    03-01-2013, 12:17 AM Go to last post
  44. The lost invoices! (MLE)

    A person receives two types of invoices. All the invoices can be independently of type I or II. One day, he received 7 invoices, 2 of which were...

    Started by keyhs‎, 02-28-2013 07:44 AM
    • Replies: 3
    • Views: 1,540
    02-28-2013, 10:41 AM Go to last post
  45. Quick Probablity question

    Hello if the number of the users is X and the number of the websites is Y and the every users use the internet Q times at least per day Q1 :...

    Started by mathan_leo‎, 02-28-2013 02:51 AM
    • Replies: 0
    • Views: 869
    02-28-2013, 02:51 AM Go to last post
  46. Help-pobability homework

    I can not figure out what I believe might be an easy probability question: 1. What is the probability that if you buy a Fast 5 ticket, you will...

    Started by stat girl‎, 02-27-2013 08:35 PM
    • Replies: 0
    • Views: 1,283
    02-27-2013, 08:35 PM Go to last post
  47. Confidence Interval for gamma distribution mean

    Hello I have a same problem which has been irritating me for so long now. The internet was no help so I post it here. If any of you guys have any...

    Started by keyhs‎, 02-26-2013 07:01 AM
    • Replies: 3
    • Views: 16,985
    02-27-2013, 04:07 PM Go to last post
  48. Two basic probability questions

    Hey everyone! Can somebody out there help me out with this? My guess is E. Is that correct? If P(A/B) = P(A), and P(B/A) = P(B), then events...

    Started by fizoster‎, 02-26-2013 08:17 PM
    • Replies: 4
    • Views: 1,602
    02-26-2013, 08:27 PM Go to last post
  49. Die throwing competition, probability of winning

    Suppose a friend and I are playing a game with a fair die. We throw alternatively and whoever rolls a 6 first wins. I get to roll first. What is the...

    Started by statsprobs‎, 02-26-2013 11:21 AM
    • Replies: 9
    • Views: 2,524
    02-26-2013, 08:16 PM Go to last post
  50. If a RV is a function of another RV, then they are dependent?

    Hello all! This is my first post on this forum. I just have a simple question. If a rv Z is a function of another rv X, then is it guaranteed that...

    Started by alext9036‎, 02-23-2013 12:26 AM
    • Replies: 6
    • Views: 1,918
    02-26-2013, 04:43 AM Go to last post
  51. Simple Probability Question

    Hello everyone, I am having problem with a question: A manufacturer has 100 memory chips in stock, 4% of which are likely to be defective based on...

    Started by alext9036‎, 02-25-2013 09:10 PM
    • Replies: 1
    • Views: 2,536
    02-26-2013, 12:27 AM Go to last post
  52. Bias, Unbias, and MSE

    Hello everyone! I am new here, this is my first post so I hope this is the right area to post this in rather than the statistics section. ...

    Started by spunkiimonkii7078‎, 02-25-2013 09:52 PM
    • Replies: 0
    • Views: 1,125
    02-25-2013, 09:52 PM Go to last post
  53. My professor and I disagree on a test's answer. would love to get a second opinion.

    The question is as follows: " In a certain country: 10% of the families have no children 20% of the families have 1 child 30% of the families...

    Started by arielk‎, 02-17-2013 08:07 AM
    random sample, random variable, tests
    • Replies: 10
    • Views: 1,888
    02-25-2013, 01:01 PM Go to last post
  54. Which statatistical analysis is appropriate?

    Hi! I am trying to look into the effect of use/non-use of social networking groups on an individual's level of ethnic identity for my research. But i...

    Started by nativenomad‎, 02-25-2013 04:16 AM
    • Replies: 0
    • Views: 1,108
    02-25-2013, 04:16 AM Go to last post
  55. Probability help

    Hello! I am a complete novice with all things related to statistics and/or probabilities (as my name suggests). I need to answer this question for a...

    Started by StatNoob101‎, 02-24-2013 09:54 PM
    • Replies: 8
    • Views: 2,246
    02-24-2013, 11:16 PM Go to last post
  56. Greetings Everyone!

    Hello all! New to the forum and very excited to have a place to turn for help. I have two problems I have to do for my stat class, and I feel that...

    Started by fizoster‎, 02-24-2013 07:57 PM
    • Replies: 0
    • Views: 834
    02-24-2013, 07:57 PM Go to last post
  57. Probability Modelling?

    Hello, first off, I'm not English, nor majoring in statistics & the sorts, nor have more than simple knowledge about the topic, so forgive me for any...

    Started by ktx2skd‎, 02-19-2013 05:28 PM
    • Replies: 6
    • Views: 1,407
    02-23-2013, 09:02 AM Go to last post
  58. Help with a simple probability problem

    Hello, and thank you in advance for any responses. I am having an odd problem. I am answering the problem, and my answer is different than the...

    Started by goob4114‎, 02-21-2013 05:11 PM
    • Replies: 1
    • Views: 1,928
    02-22-2013, 03:10 PM Go to last post
  59. Need help calculating some values to be used in a cost/risk analysis

    Hello, **If this is in the wrong forum, could someone tell me where it needs to be before removing it?**** I am needing some help calculating...

    Started by trux‎, 02-22-2013 02:50 AM
    prob, probability, probability help, probability question, probability theory
    • Replies: 0
    • Views: 948
    02-22-2013, 02:50 AM Go to last post
  60. How to calculate the probability between two normal distributions?

    Using the normal distribution. Let X  N(1, 2) and Y  N(2, 3) where N(μ, variance) denotes the normal distribution with mean μ and variance . X...

    Started by supremerule8‎, 02-21-2013 04:51 PM
    normal distribution, probability density, variance
    • Replies: 7
    • Views: 2,415
    02-21-2013, 07:42 PM Go to last post

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