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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: 17,547
    09-30-2005, 10:44 AM Go to last post
  1. 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, Yesterday 01:22 PM
    • Replies: 12
    • Views: 162
    Today, 12:44 PM Go to last post
  2. 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, Today 10:12 AM
    • Replies: 0
    • Views: 25
    Today, 10:12 AM Go to last post
  3. 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: 0
    • Views: 92
    11-29-2016, 03:48 PM Go to last post
  4. 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: 47
    11-29-2016, 03:45 PM Go to last post
  5. 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
    palindrome
    • Replies: 1
    • Views: 115
    11-27-2016, 01:10 PM Go to last post
  6. 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: 157
    11-24-2016, 02:18 PM Go to last post
  7. 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: 185
    11-22-2016, 04:40 PM Go to last post
  8. 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: 79
    11-22-2016, 11:32 AM Go to last post
  9. 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: 120
    11-21-2016, 08:22 AM Go to last post
  10. 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: 192
    11-19-2016, 01:36 PM Go to last post
  11. 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: 109
    11-19-2016, 03:01 AM Go to last post
  12. 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: 236
    11-15-2016, 01:51 PM Go to last post
  13. Carnival game of Under-Or-Over 7?

    I am sorry lmao.

    Started by person‎, 11-15-2016 10:37 AM
    • Replies: 1
    • Views: 155
    11-15-2016, 11:24 AM Go to last post
  14. 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: 109
    11-15-2016, 07:51 AM Go to last post
  15. 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: 113
    11-15-2016, 01:04 AM Go to last post
  16. 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: 94
    11-14-2016, 10:38 PM Go to last post
  17. 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: 144
    11-14-2016, 05:41 PM Go to last post
  18. 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: 86
    11-14-2016, 01:44 PM Go to last post
  19. 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: 108
    11-14-2016, 08:47 AM Go to last post
  20. 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: 217
    11-10-2016, 03:07 PM Go to last post
  21. 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: 416
    11-09-2016, 02:32 PM Go to last post
  22. 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: 191
    11-09-2016, 09:31 AM Go to last post
  23. 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: 301
    11-04-2016, 10:25 AM Go to last post
  24. 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: 214
    11-01-2016, 10:21 PM Go to last post
  25. 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: 198
    10-31-2016, 02:48 PM Go to last post
  26. Roulette Probabilities

    Did it wrong... delete

    Started by Speakmore‎, 10-30-2016 07:53 PM
    • Replies: 0
    • Views: 161
    10-30-2016, 07:53 PM Go to last post
  27. 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: 233
    10-26-2016, 08:18 AM Go to last post
  28. 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: 155
    10-25-2016, 03:56 PM Go to last post
  29. 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: 228
    10-22-2016, 12:21 AM Go to last post
  30. 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: 257
    10-19-2016, 05:45 AM Go to last post
  31. 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: 343
    10-18-2016, 08:26 AM Go to last post
  32. 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: 212
    10-13-2016, 01:13 PM Go to last post
  33. 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: 231
    10-11-2016, 04:57 PM Go to last post
  34. 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: 332
    10-11-2016, 04:38 PM Go to last post
  35. 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: 165
    10-11-2016, 03:35 PM Go to last post
  36. Normalized Z-Table Questiong Is this right having problem with final answer

    The amount of time it takes to produce a part is normally distributed with a mean equal to 10 second and standard deviation equal to 2 seconds. Fine...

    Started by ANNJALA‎, 10-10-2016 03:15 PM
    probablity, z table
    • Replies: 2
    • Views: 232
    10-10-2016, 08:43 PM Go to last post
  37. Travelling

    Hi, Still on my quest to sort probabilities problems involving time, I was trying to get help on this: If my car is traveling at 100 km / h in...

    Started by Dedes‎, 10-06-2016 11:27 PM
    • Replies: 2
    • Views: 274
    10-07-2016, 02:36 AM Go to last post
  38. 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 08:38 AM
    • Replies: 0
    • Views: 206
    10-06-2016, 08:38 AM Go to last post
  39. 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 04:53 PM
    probability
    • Replies: 1
    • Views: 207
    10-06-2016, 02:25 AM Go to last post
  40. "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 10:01 PM
    • Replies: 1
    • Views: 189
    10-06-2016, 02:04 AM Go to last post
  41. 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 09:31 AM
    • Replies: 2
    • Views: 296
    10-05-2016, 09:26 AM Go to last post
  42. 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 09:48 AM
    betting, normal distribution, probability, time frames
    • Replies: 0
    • Views: 159
    10-03-2016, 09:48 AM Go to last post
  43. 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 09:56 AM
    • Replies: 4
    • Views: 389
    10-02-2016, 07:10 AM Go to last post
  44. 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 11:21 PM
    • Replies: 5
    • Views: 373
    09-28-2016, 05:03 PM Go to last post
  45. 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 02:52 PM
    • Replies: 0
    • Views: 193
    09-28-2016, 02:52 PM Go to last post
  46. 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 01:08 AM
    • Replies: 9
    • Views: 431
    09-27-2016, 10:46 PM Go to last post
  47. 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 10:33 AM
    • Replies: 0
    • Views: 181
    09-26-2016, 10:33 AM Go to last post
  48. 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 11:42 PM
    binomial variable, college, probability, values
    • Replies: 2
    • Views: 352
    09-24-2016, 11:23 AM Go to last post
  49. 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 04:13 AM
    • Replies: 0
    • Views: 222
    09-22-2016, 04:13 AM Go to last post
  50. 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 03:21 PM
    • Replies: 2
    • Views: 282
    09-21-2016, 09:57 AM Go to last post
  51. 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 05:17 PM
    game, probability
    • Replies: 4
    • Views: 338
    09-19-2016, 12:23 AM Go to last post
  52. 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 08:16 AM
    • Replies: 0
    • Views: 262
    09-15-2016, 08:16 AM Go to last post
  53. 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 07:23 AM
    • Replies: 4
    • Views: 509
    09-07-2016, 10:58 PM Go to last post
  54. Question What type of distribution is being described (binomial or poisson)?

    hhhhhhhhjjjj

    Started by georginatz‎, 08-26-2016 03:43 AM
    • Replies: 2
    • Views: 659
    08-26-2016, 08:59 AM Go to last post
  55. 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 07:09 PM
    • Replies: 3
    • Views: 423
    08-26-2016, 04:07 AM Go to last post
  56. 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 09:32 PM
    • Replies: 0
    • Views: 211
    08-25-2016, 09:32 PM Go to last post
  57. 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 11:09 AM
    • Replies: 1
    • Views: 213
    08-25-2016, 05:16 PM Go to last post
  58. 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 11:15 AM
    • Replies: 2
    • Views: 295
    08-25-2016, 03:56 PM Go to last post
  59. 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 08:05 PM
    • Replies: 12
    • Views: 740
    08-14-2016, 02:38 AM Go to last post
  60. 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 10:29 AM
    • Replies: 6
    • Views: 398
    08-12-2016, 11:32 AM Go to last post

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