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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 10:44 AM
    • Replies: 0
    • Views: 18,369
    09-30-2005, 10:44 AM Go to last post
  1. Bayesian exercise

    -2 down vote favorite I cant get my head round the following exercise: You are testing dice for a casino to make sure that sixes do not come up...

    Started by randomrun‎, Today 09:00 AM
    bayes, bayesian inference, probability
    • Replies: 5
    • Views: 101
    Today, 01:56 PM Go to last post
  2. Trying To Produce Random Distribution In Excel?

    Hi, Im trying to do some studies in excel to teach myself probabilities and the outcome of a study is pretty much the opposite of what i...

    Started by Tomhgriff1‎, 01-06-2017 03:08 PM
    • Replies: 8
    • Views: 317
    Yesterday, 11:45 AM Go to last post
  3. Arrival time

    Suppose there are five people, let t1 be the first arrival time which van be computed from min{X1,...,X5} t2 is the time of the next and so on. and...

    Started by karaks5‎, Yesterday 05:37 AM
    arrival time, exponential distribution
    • Replies: 0
    • Views: 69
    Yesterday, 05:37 AM Go to last post
  4. Probability question, I think

    Hoping someone can tell me the kind of question I'm trying to answer, and then point me at an online calculator or formula for such problems, so I...

    Started by vicG‎, 01-13-2017 01:20 PM
    • Replies: 2
    • Views: 156
    01-16-2017, 06:35 PM Go to last post
  5. Train car: probability to have a seat

    A train has got five train cars, each one with N seats. There are 150 passengers who randomly choose one of the cars. What is the probability that...

    Started by Mottler‎, 01-13-2017 01:39 PM
    • Replies: 0
    • Views: 135
    01-13-2017, 01:39 PM Go to last post
  6. Spectral measure

    Hi! Sry for bad english :( I have a problem: A stochastic process is identically equal to one. How does it spectral measure arranged? И на русском:...

    Started by redalertgamer‎, 01-04-2017 06:19 AM
    • Replies: 3
    • Views: 284
    01-13-2017, 05:25 AM Go to last post
  7. Exclamation Bayes Rule!

    Hi, My question is: A company wishes to evaluate the effectiveness of a marketing campaign. Seventy-five percent of all customers using the...

    Started by Zahra98‎, 01-09-2017 07:43 PM
    • Replies: 1
    • Views: 194
    01-09-2017, 08:22 PM Go to last post
  8. Maximum likelihood estimation for exponential distribution

    I would like to describe some gathered data for arrival process which seems not following Poisson distribution for people finding a job. The data...

    Started by karaks5‎, 01-07-2017 09:22 AM
    exponential distribution, maximum likelihood
    • Replies: 0
    • Views: 172
    01-07-2017, 09:22 AM Go to last post
  9. Warning: I know next to nothing about stats and have a question on sample selection

    Hi everyone, I am not sure if I can even articulate my problem clearly, but I need some feedback on whether my concern is valid. In order to...

    Started by oyvey‎, 01-06-2017 08:40 PM
    • Replies: 0
    • Views: 188
    01-06-2017, 08:40 PM Go to last post
  10. Exclamation Teaching chi≤ distribution

    Hello, I would like to explain to students the chi≤-distribution in an inutitive way but I don't know how to do it. All the videos that I watch...

    Started by Eometh‎, 01-02-2017 04:48 AM
    • Replies: 1
    • Views: 338
    01-02-2017, 06:53 PM Go to last post
  11. Pair of dice, normal distribution

    A pair of fair dice rolled 180 times. Use the normal approximation method to find the probability that a total of 7 occurs At least 25 times...

    Started by wajeeha yasin‎, 12-31-2016 09:42 AM
    • Replies: 1
    • Views: 274
    12-31-2016, 11:09 AM Go to last post
  12. Smile Normal Distribution

    Assuming that the number of marks scored by a candidate is normally distributed, find the mean and the standard deviation, if the number of first...

    Started by wajeeha yasin‎, 12-31-2016 09:29 AM
    probability, statisics
    • Replies: 1
    • Views: 254
    12-31-2016, 09:36 AM Go to last post
  13. Calculating probability to construct a random variable probability function

    Hello all, I have this question and I struggle to understand what to do. "There are 2 groups of numbers: A: 2,2,3,3 and B: 5,5,6 A number is...

    Started by Yankel‎, 12-28-2016 03:51 AM
    • Replies: 2
    • Views: 276
    12-28-2016, 08:40 AM Go to last post
  14. Hypothetical draft lottery

    I was trying to devise an equitable MLB draft lottery system which reduces the benefit of "tanking" but heavily weighs record and has a slight...

    Started by nine16‎, 12-27-2016 12:18 PM
    • Replies: 0
    • Views: 237
    12-27-2016, 12:18 PM Go to last post
  15. Calculating the probability of finding pairs of n-letter substrings in DNA

    Hi, I've been struggling a bit with this problem: If I have a sequence of DNA made from letters ATGC which has a length of say 3571 letters,...

    Started by James1984‎, 12-21-2016 07:58 PM
    • Replies: 0
    • Views: 321
    12-21-2016, 07:58 PM Go to last post
  16. picking a present box with more than one characteristicss

    I have a probability problem which is simplified as following, I need to check if my solution is true: If there is a bag contains 20 of small...

    Started by Harith‎, 12-20-2016 06:11 AM
    • Replies: 0
    • Views: 218
    12-20-2016, 06:11 AM Go to last post
  17. NCA Office Pool Win Probability

    Hello, I run a small NCAA office pool website where folks make predictions about the outcome of each game in a 64-team tournament that consists of...

    Started by BustedBracket‎, 12-19-2016 02:12 AM
    code, ncaa, probability, tournament
    • Replies: 0
    • Views: 198
    12-19-2016, 02:12 AM Go to last post
  18. Poisson process: phone calls

    We assume that phone calls arrive according to a Poisson process with rate 2. If I know that up to time t = 1 there is one call only, how likely is...

    Started by endlessend25‎, 12-17-2016 10:19 AM
    poisson process, stochastic process
    • Replies: 1
    • Views: 202
    12-18-2016, 11:41 AM Go to last post
  19. Total and quadratic variation of a function

    Let f(x)= x2−3, for x<3, x2+3, for x≥3 I need to determine the total variation and the quadratic variation of f(x) on the interval . For...

    Started by endlessend25‎, 12-17-2016 10:23 AM
    function, variation
    • Replies: 0
    • Views: 195
    12-17-2016, 10:23 AM Go to last post
  20. Question Solving a LogNormal Conditional expectation equation - Insurance

    Hi everyone, I am a newbie here and apologize if this post is in the wrong forum. I need help to solve the following LogNormal Conditional...

    Started by OLSMAG‎, 12-16-2016 06:33 AM
    conditional expectation, insurance, lognormal
    • Replies: 7
    • Views: 319
    12-16-2016, 11:02 AM Go to last post
  21. Simple but annoying probability question

    A, B and C are in three way race - If the probability of A beating B is p, and the probability of A beating C is q, what is the probability of A...

    Started by katxt‎, 12-08-2016 09:31 PM
    • Replies: 8
    • Views: 635
    12-12-2016, 01:57 AM Go to last post
  22. Number of Possible Orders

    In a regional spelling bee, the 8 finalists consist of 3 boys and 5 girls. Find the number of sample points in the sample space S for the number of...

    Started by jaddy2016‎, 12-11-2016 04:15 AM
    order, permutation, probability
    • Replies: 1
    • Views: 233
    12-11-2016, 07:13 AM Go to last post
  23. Probability Q help, uses combinatorics, Poisson-Distr and possibly Multinomal

    Place successively and independent of each other 20 particles into 10 boxes. Hereby, each of the 10 boxes is chosen with the same probability. a)...

    Started by bkc‎, 12-10-2016 03:05 PM
    poisson, probability
    • Replies: 0
    • Views: 197
    12-10-2016, 03:05 PM Go to last post
  24. Question Real life probability problem

    So I'm wondering if someone can solve this problem for me. Some work was done in our kitchen yesterday and the fridge had to be moved. I noticed some...

    Started by nevsauce‎, 12-10-2016 04:15 AM
    • Replies: 1
    • Views: 219
    12-10-2016, 07:37 AM Go to last post
  25. Distribution of X+Y of a bivariate normally distributed (X,Y)

    I need to give the distribution of $X+Y$ and $X-Y$ knowing that $(X,Y)$ is bivariate normally distributed with marginal means 1, marginal variances 1...

    Started by endlessend25‎, 11-29-2016 03:48 PM
    marginal, normal distributed, self-study
    • Replies: 1
    • Views: 324
    12-07-2016, 04:19 AM Go to last post
  26. Question Probability that an unknown system corresponds to one of two possible systems

    My problem can be stated as follows: given two different systems S1 and S2, each characterized by a set of parameters, say {p1,p2,...,pN}, what's a...

    Started by washiloo‎, 12-05-2016 01:50 PM
    • Replies: 1
    • Views: 301
    12-05-2016, 02:03 PM Go to last post
  27. Generating a dataset with normal distribution acc. to K-S-test and S-W-test in SPSS

    Iím writing a paper on regression analysis in SPSS, and the data set of the outcome variable is assumed to be normally distributed. Itís a...

    Started by Morten67‎, 12-01-2016 01:22 PM
    • Replies: 12
    • Views: 444
    12-02-2016, 12:44 PM Go to last post
  28. statistic question help

    hello :) really need help with something. If person A makes an event once every 50 days, and person B makes an event once every 30 days (the...

    Started by netanel99‎, 12-02-2016 10:12 AM
    • Replies: 0
    • Views: 190
    12-02-2016, 10:12 AM Go to last post
  29. Computer game log normally distributed

    I'm playing a computer game and I want to boost the high score. I assume that attempts are independent (say, you do not improve by playing), and in...

    Started by endlessend25‎, 11-29-2016 03:45 PM
    independence, log, self-study
    • Replies: 0
    • Views: 188
    11-29-2016, 03:45 PM Go to last post
  30. 5 letter palindrome

    Hello, I need help with these two questions. In a 5 letter word (out of 26): 1) What is the probability that L,E and D won't appear? 2) What...

    Started by Tuvia‎, 11-27-2016 11:00 AM
    • Replies: 1
    • Views: 273
    11-27-2016, 01:10 PM Go to last post
  31. S1 Statistics question help! Majorly stuck

    Hi I have 3 statistics questions that I would like help with, 1. When Albert eats in a certain restaurant, he always eats either chicken or beef...

    Started by Mstainer18‎, 11-24-2016 02:18 PM
    a level, a level stats, probability, stat 1, statistics 1
    • Replies: 0
    • Views: 317
    11-24-2016, 02:18 PM Go to last post
  32. What distribution is better in these situations?

    I'm new in statistics and probability and I'm a little lost about what distribution is better in these situations: If a tumor is malignant or...

    Started by nhansolo‎, 11-22-2016 02:00 PM
    biostatistics, distribution, distributions, probability, statistic
    • Replies: 3
    • Views: 343
    11-22-2016, 04:40 PM Go to last post
  33. Question about Merton's optimisation Model

    Hi there :) This is actually my very first thread on this forum and I hope it won't be the last and that I'll have the opportunity to discuss with...

    Started by Mim7‎, 11-22-2016 11:32 AM
    • Replies: 0
    • Views: 191
    11-22-2016, 11:32 AM Go to last post
  34. Process capability analysis (Individuals)

    Good morning, i'm working with data following a normal distribution and my purpose is to estimate the capability of my method by measuring Cp and...

    Started by IreneB91‎, 11-21-2016 03:33 AM
    • Replies: 1
    • Views: 264
    11-21-2016, 08:22 AM Go to last post
  35. How to find expectation of continuous random variable using indicator?

    Let's take a simple example. X ~ Uniform . We know E(X) is 1 using the standard formula. But how to find this using indicator function?

    Started by geniusacamel‎, 11-19-2016 01:31 AM
    • Replies: 2
    • Views: 346
    11-19-2016, 01:36 PM Go to last post
  36. Two approaches to the same problem in probability

    Hello all I have this question: Two basketball players shoot the ball. The probability of the first one to succeed is 0.8, and the probability...

    Started by Yankel‎, 11-19-2016 03:01 AM
    • Replies: 0
    • Views: 265
    11-19-2016, 03:01 AM Go to last post
  37. Probability from sample and sub-groups

    Greetings! I was trying to determine probability of soccer tryout success. In Maryland, there are 5,300 boys in this group. There are 320 teams...

    Started by milan819‎, 11-15-2016 01:51 PM
    • Replies: 0
    • Views: 396
    11-15-2016, 01:51 PM Go to last post
  38. Carnival game of Under-Or-Over 7?

    I am sorry lmao.

    Started by person‎, 11-15-2016 10:37 AM
    • Replies: 1
    • Views: 310
    11-15-2016, 11:24 AM Go to last post
  39. Sudokua problem using related binomial distribution

    It is given: If you succeed to solve a Sudoku with probability 0.4 and you try many times, how likely is it that you succeed twice before you...

    Started by endlessend25‎, 11-15-2016 07:51 AM
    binomial distribution, expected value, self-study
    • Replies: 0
    • Views: 237
    11-15-2016, 07:51 AM Go to last post
  40. How to evaluate Mean and Variance of Min Function??

    Detail is Given in Image attach

    Started by imtiyazkhan‎, 11-15-2016 01:04 AM
    • Replies: 0
    • Views: 240
    11-15-2016, 01:04 AM Go to last post
  41. The probability that I am missing only one tile

    Background I recently became fascinated (really!) in this probability problem. I have done quite a bit of work to figure out the answer...

    Started by snowguy‎, 11-14-2016 10:38 PM
    game, letters
    • Replies: 0
    • Views: 209
    11-14-2016, 10:38 PM Go to last post
  42. Distribution function of an exponential random variable

    Let Y ⇠ Exp(2) be the size of an insurance loss. If the insurance company pays min(Y, 4), what is the variance of that payment? I know that lambda...

    Started by endlessend25‎, 11-14-2016 01:39 PM
    exponential distribution, self-study
    • Replies: 3
    • Views: 282
    11-14-2016, 05:41 PM Go to last post
  43. Resulting expected value of a bounded exponential pdf

    I need to determine the distribution function of an exponential random variable with mean 2, given that its outcome is larger than 2 and give the...

    Started by endlessend25‎, 11-14-2016 01:44 PM
    expected value, exponential, self-study
    • Replies: 0
    • Views: 211
    11-14-2016, 01:44 PM Go to last post
  44. Probability Question

    An ice cream company makes ice cream bars on sticks which sell for 10 cents. Suppose that the company puts a star on every 50th stick; anyone who...

    Started by dharjai‎, 11-14-2016 08:37 AM
    • Replies: 1
    • Views: 265
    11-14-2016, 08:47 AM Go to last post
  45. Probability of observing mean difference/compute ranksum

    Hi everyone, would appreciate some help on these three questions. If possible with calculations so that I can understand more easily! Suppose the...

    Started by gossipgirl‎, 11-10-2016 03:07 PM
    mean difference, median difference, probability
    • Replies: 0
    • Views: 365
    11-10-2016, 03:07 PM Go to last post
  46. Probabilistic Graphical Model

    I created a data frame from what the instructor gave me for my homework: > cbind(Person.ID, Lerner.Alum, KJ, R) Person.ID Lerner.Alum KJ R...

    Started by DV Man‎, 11-06-2016 05:40 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 667
    11-09-2016, 02:32 PM Go to last post
  47. Ratio of chi squared distribution.

    U_1 and U_2 are both \chi^2 distribution with 1 and 2 degrees of freedom respectively. Both U_1 and U_2 are independent. Denote \frac{U_1}{U_2} by X....

    Started by geniusacamel‎, 11-08-2016 11:18 AM
    • Replies: 1
    • Views: 318
    11-09-2016, 09:31 AM Go to last post
  48. Standard Normal Distribution

    Z ~ N(0,1) How to show that Z\stackrel{d}{=} -Z and \frac{Z^2}{2} ~ gamma(\frac{1}{2})? Also how to show that only the standard normal...

    Started by geniusacamel‎, 11-02-2016 09:23 PM
    • Replies: 4
    • Views: 444
    11-04-2016, 10:25 AM Go to last post
  49. Question Probability with Poker Hands, Please Help!

    Hi everyone, I joined the forum just to ask this question about one issue I'm having with probability. Your help is much appreciated. I already...

    Started by artife‎, 11-01-2016 10:21 PM
    • Replies: 0
    • Views: 344
    11-01-2016, 10:21 PM Go to last post
  50. Average Probablities over a quarter

    Hi all, I have the following probability data for a medical event, I need to find what was the overall probability for these three month? 1-...

    Started by alex_a‎, 10-31-2016 11:10 AM
    • Replies: 1
    • Views: 341
    10-31-2016, 02:48 PM Go to last post
  51. Roulette Probabilities

    Did it wrong... delete

    Started by Speakmore‎, 10-30-2016 07:53 PM
    • Replies: 0
    • Views: 299
    10-30-2016, 07:53 PM Go to last post
  52. Predicting Score Based On Historical Performance

    Hi all, You will have to forgive my very basic understanding of probability, but any help would be appreciated. Basically I have a system that...

    Started by Admonty‎, 10-26-2016 02:12 AM
    • Replies: 1
    • Views: 370
    10-26-2016, 08:18 AM Go to last post
  53. Probibilities on opening hand at bridge

    Hi all bridge lovers! Bridge is a wonderful and very complex card playing game with thousands of books written about it. For those who do not...

    Started by peteritv‎, 10-25-2016 03:56 PM
    • Replies: 0
    • Views: 297
    10-25-2016, 03:56 PM Go to last post
  54. Emperical Rule

    In finding the upper and lower bound with 95% confidence, I input numeric data and use descriptive stat on excel for mean and standard deviation....

    Started by aosunkoya‎, 10-22-2016 12:21 AM
    • Replies: 0
    • Views: 358
    10-22-2016, 12:21 AM Go to last post
  55. NFL Win Probabilities

    Check out this site that keeps track of all the probabilities of the big NFL stat models: http://trevorbischoff.com/2016-amos-nfl-predictions/

    Started by LeeBalto‎, 10-19-2016 05:45 AM
    • Replies: 0
    • Views: 405
    10-19-2016, 05:45 AM Go to last post
  56. Definition of random variable with respect to event space

    It is given that: We toss two dice with sample space Ω = {(i, j), 1 ≤ i, j ≤ 6} and the σ-algebra is generated by the events Ak = {(i,j) :...

    Started by endlessend25‎, 10-17-2016 04:19 PM
    probability, self-study, sigma-algebra
    • Replies: 7
    • Views: 487
    10-18-2016, 08:26 AM Go to last post
  57. Conditional Monthly Risk Calibration for a trading model

    Hi, I have a trading system with a portfolio of assets (long and shorts) with daily market returns. I want to overlay a risk management to my...

    Started by system2016‎, 10-13-2016 01:13 PM
    probability, risk calibration, trading system
    • Replies: 0
    • Views: 346
    10-13-2016, 01:13 PM Go to last post
  58. Question Probability

    What are the odds of miss by one all lottery number. In my country the lotto is 38C6. Let say the winning number were: 06, 11, 18, 26, 30, 33 ...

    Started by antonioroques‎, 10-11-2016 03:20 PM
    • Replies: 1
    • Views: 362
    10-11-2016, 04:57 PM Go to last post
  59. Limiting Distribution question

    Let X1,......,Xn ~ Uniform (0,1). Let Yn = X bar n ^2. Find the limiting distribution of Yn. We know that whenever a random variable has a...

    Started by greg6363‎, 10-07-2016 08:05 PM
    • Replies: 2
    • Views: 542
    10-11-2016, 04:38 PM Go to last post
  60. Unhappy Binomial Probablity Distribution exactly one & and at least one.. check my answer

    Your favorite baseball player has a 0.300 batting average (that is, he averages three hits for every 10 times he is up to bat). If he is up to bat...

    Started by ANNJALA‎, 10-11-2016 12:31 PM
    binomial probability
    • Replies: 3
    • Views: 286
    10-11-2016, 03:35 PM Go to last post

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