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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: 12,315
    09-30-2005, 09:44 AM Go to last post
  1. Compound Probability

    Hey guys, i am having a bit of trouble with this basic probability question which shows that i do not understand the basics at all. The question...

    Started by daandrew‎, Yesterday 11:39 AM
    baseball, compound probability, probability
    • Replies: 3
    • Views: 75
    Yesterday, 12:15 PM Go to last post
  2. Immortality and Conditional Probability

    - Hopefully, I won't aggravate readers so much with this approach. - Here, my claim is simply that the likelihood of my current existence is...

    Started by Jabba‎, 04-13-2015 10:20 AM
    4 Pages
    1 2 3 ... 4
    • Replies: 52
    • Views: 1,065
    Yesterday, 10:57 AM Go to last post
  3. Redundancy probability in employment

    The idea of being made redundant after working so many years in a company is everyone's nightmare. I am currently working in a company employing...

    Started by casy‎, 04-17-2015 03:17 PM
    probability help
    • Replies: 2
    • Views: 92
    Yesterday, 01:40 AM Go to last post
  4. Exercises with answers

    Hello probabilitygeniuses I am very new to probabilities and would like to ask if there are online resources with loads of probability...

    Started by molly‎, 04-15-2015 09:29 AM
    • Replies: 4
    • Views: 146
    04-17-2015, 03:40 AM Go to last post
  5. Smile Using MLE to find the right distribution

    Hi, I know that MLE can be used to find the best fitting parameter assuming a that the distribution is known, but is there a way (using Excel or...

    Started by dstat2‎, 04-13-2015 10:20 AM
    distribution probability, excel, mle, parameter estimates, sas
    • Replies: 2
    • Views: 136
    04-15-2015, 10:20 PM Go to last post
  6. How to calculate combined probability of causally-linked events: joint probability?

    Hello, I'm a statistics novice trying to understand how to approach what I suspect is a fairly basic probability problem. I'd be very grateful for...

    Started by jimi‎, 04-15-2015 06:44 AM
    • Replies: 0
    • Views: 70
    04-15-2015, 06:44 AM Go to last post
  7. How to efficiently allocate marketing dollars among various media?

    Should I use expected return on investment for the Net, direct mail flyers, cold calling, etc., and then divide the money or just dump all of it...

    Started by Outlier‎, 04-14-2015 01:12 PM
    • Replies: 0
    • Views: 73
    04-14-2015, 01:12 PM Go to last post
  8. The probability of cannibalism

    Hi, I am interested in calculating the probability of cannibalism occurring in groups of fish (25). The species I am looking at are known to...

    Started by JibbaJabba‎, 04-13-2015 11:41 PM
    • Replies: 1
    • Views: 64
    04-14-2015, 01:03 AM Go to last post
  9. Exclamation Joint Distributions and a 3rd Variable

    I am struggling with this probability problem. Consider the random variables X and Y with joint distribution as given below. X 0 1 ...

    Started by kathharr‎, 04-12-2015 09:25 AM
    • Replies: 1
    • Views: 113
    04-12-2015, 10:53 AM Go to last post
  10. Risk Management

    There is 3% coral coverage in a sea area of l=200m b=5m. The size(diameter) of each coral is 50 cm. If we throw a block of 1m2 in the area. How many...

    Started by Mr Good News‎, 04-10-2015 02:52 AM
    probability
    • Replies: 2
    • Views: 197
    04-11-2015, 07:36 PM Go to last post
  11. Question Continuous joint entropy with fully dependent variable

    Consider a variable X with a continuous uniform distribution in the interval and a variable Y that is fully dependent on X, i.e., p(Y=y |...

    Started by ASML‎, 04-11-2015 04:59 PM
    dependence, entropy, joint distribution
    • Replies: 0
    • Views: 104
    04-11-2015, 04:59 PM Go to last post
  12. Searching for a probability distribution where expected value is zero.

    Hi, I am working on an agent based model. And, in the model every agent has an action. The action leads to a certain pay-off. The assumption is...

    Started by Neha‎, 04-08-2015 12:11 PM
    probability function, random draw
    • Replies: 1
    • Views: 162
    04-08-2015, 01:25 PM Go to last post
  13. Immortality & Bayesian Statistics

    - I seem to have written an 8 page paper virtually proving -- through Bayesian statistics -- that we are immortal (or something similar). Obviously,...

    Started by Jabba‎, 03-16-2015 10:12 AM
    6 Pages
    1 2 3 ... 6
    • Replies: 81
    • Views: 3,208
    04-06-2015, 05:11 PM Go to last post
  14. family game: how many combinations are possible?

    Hi guys I'm almost getting crazy. We are playing a game in our family and i wanted to demonstrate my son for what probability is useful. Now i am...

    Started by chrigii77‎, 04-06-2015 06:29 AM
    • Replies: 1
    • Views: 126
    04-06-2015, 06:44 AM Go to last post
  15. Normal Approximation to the Binomial Distribution

    Hello everyone. So, I was trying to solve some exercises on the normal distribution and the approximation of Normal to Binomial but I just can't...

    Started by asantos‎, 04-05-2015 04:30 PM
    • Replies: 0
    • Views: 122
    04-05-2015, 04:30 PM Go to last post
  16. Estimate of variance in mean of one population removed from another

    Hello, Thanks for looking at my post! I have a some 40,000 items for which I have calculated the mean and standard deviation of a property,...

    Started by Sweep‎, 04-02-2015 05:00 AM
    • Replies: 0
    • Views: 118
    04-02-2015, 05:00 AM Go to last post
  17. Rolling a die 600 times

    So I was given a question that states that "A gambler buys a new die and throws it 600 times. Assuming the die is unbiased, estimate the probability...

    Started by kittykat123‎, 04-01-2015 08:36 AM
    best method?, die, poisson distribution?, probability
    • Replies: 2
    • Views: 208
    04-01-2015, 12:55 PM Go to last post
  18. My web pages on finding probabilites of runs

    I now have several pages up on the topic. The starting page is: http://home.ptd.net/~artnpeg/RUNS.html I cover derivations of algorithms, js and...

    Started by ArtK‎, 03-30-2015 07:48 AM
    • Replies: 0
    • Views: 127
    03-30-2015, 07:48 AM Go to last post
  19. Combining two normal distrubtions, 1 of which is for a project which may not happen

    Hello, I have to 2 projects: Project A: Median: $450k, Variance: 625 Project B: Median: $750k, Variance: 1250 Combined Freqency Distribution:...

    Started by mr e guest‎, 03-27-2015 10:55 AM
    • Replies: 2
    • Views: 152
    03-30-2015, 06:33 AM Go to last post
  20. Multiple-testing correction in Moderation analyses

    Hi Everyone! In an exploratory attempt, I ran 35 moderation analyses (both 2-way and 3-way interactions) of which 7 were significant. NOw the...

    Started by rsfrzh‎, 03-27-2015 12:25 PM
    alpha, bonferroni correction, moderation, multiple testing
    • Replies: 0
    • Views: 138
    03-27-2015, 12:25 PM Go to last post
  21. Roulette probability question

    Hello I have a basic but quite difficult question about roulette probabilities (assuming roulette has 37 numbers 0-36). I need a general formula for...

    Started by Kav‎, 02-19-2015 11:49 AM
    • Replies: 4
    • Views: 182
    03-25-2015, 05:16 PM Go to last post
  22. Practical Birthday-Month probabilities

    Hello, I have a practical question that arose in a company gathering last week and as a biologist with very little statistic background I am looking...

    Started by apponi‎, 03-23-2015 01:00 PM
    • Replies: 3
    • Views: 204
    03-23-2015, 04:37 PM Go to last post
  23. Undergrads Probablity

    Hi, Am I understand the students' score order correctly? On a psychology exam with m = 76 and = 12, Tom scored 8 points below the mean, Mary had a...

    Started by iza‎, 03-21-2015 04:21 PM
    • Replies: 2
    • Views: 271
    03-21-2015, 06:38 PM Go to last post
  24. Question Thumbs Up or Down on my logic

    Very rusty on my statistics and will appreciate validation or correction on my thinking. "Fair" playing field - 88 players (18 in red shirts, 70...

    Started by hAltonJones‎, 03-21-2015 12:12 PM
    basic probability, newbie, probability
    • Replies: 5
    • Views: 230
    03-21-2015, 02:30 PM Go to last post
  25. One problem - two approaches, two different answers

    A test is based upon the average of 5 results. Assuming only random errors in measurement, what is the probability the data is trended (sequential...

    Started by BoSachok‎, 03-20-2015 12:52 PM
    • Replies: 0
    • Views: 197
    03-20-2015, 12:52 PM Go to last post
  26. Probability problem

    I am stuck, kindly help. There are two men V1 and V2. Each man has two buckets A and B. Bucket A contains numbered blocks from 7 to 14. Bucket B...

    Started by aliraja‎, 03-20-2015 06:30 AM
    • Replies: 3
    • Views: 204
    03-20-2015, 08:33 AM Go to last post
  27. Simple probability question

    Hi everybody, I have a really simple question to ask. Let us suppose to have a box with a button. This box contains an unknown number of white...

    Started by Laggio Conda‎, 03-19-2015 08:06 AM
    • Replies: 1
    • Views: 159
    03-19-2015, 08:20 AM Go to last post
  28. Bayesian and Probability

    A certain disease has infected 2% of the population. The firm has annoucned that 90% of those infected will show a postive test result , while 95% of...

    Started by xenovia‎, 03-17-2015 07:26 PM
    • Replies: 14
    • Views: 370
    03-18-2015, 03:39 PM Go to last post
  29. Question Having a pdf V and then defining a new one as W=V+1 & range of values

    The question goes as follows, there's a function V that equals 0.5 for -1<v<=1 and 0 otherwise. From this we define a new function W that is defined...

    Started by UsernamesAreUseless‎, 03-18-2015 07:37 AM
    • Replies: 1
    • Views: 145
    03-18-2015, 07:58 AM Go to last post
  30. Help solving probability scenario

    I play in a pool league and 4 of my teammates and I were busy practicing when we happened across an interesting scenario: Between 5 of us we...

    Started by FordLaz‎, 03-13-2015 11:11 AM
    • Replies: 12
    • Views: 422
    03-17-2015, 06:29 AM Go to last post
  31. Question about a Bernoulli experiment.

    Hi everyone. I have a problem on my mind as well as a solution for it, but I want to check if there are some other ways of solving it. So, let's...

    Started by eagleking95‎, 03-14-2015 01:14 PM
    • Replies: 2
    • Views: 252
    03-14-2015, 04:33 PM Go to last post
  32. Simulate and sample from a group

    I'm confused with a question as follows: Consider the case that the total number of accidents happening in a highway in one day follows the...

    Started by Bojo‎, 03-14-2015 05:48 AM
    • Replies: 0
    • Views: 179
    03-14-2015, 05:48 AM Go to last post
  33. get a distribution of x from y

    Hello I have two variables x and y with a roughly linear relationship and good correlation. I have been given a y value and I want to get a...

    Started by andyspeak‎, 03-13-2015 12:43 PM
    • Replies: 0
    • Views: 161
    03-13-2015, 12:43 PM Go to last post
  34. Random Variable of two other random variables. Confusion to the max!

    Here is the question at hand: I don't even know how to begin this question. I'm not looking for a complete solution per se but I don't even know...

    Started by Not a Statistician‎, 03-12-2015 06:38 PM
    binomial distribution, pmf, probability, random variables
    • Replies: 1
    • Views: 282
    03-13-2015, 03:14 AM Go to last post
  35. Probability dilemma?

    Hey everybody.. So my friend and I (high school seniors) had a bit of a disagreement. To get to the point, my contention is that, the more...

    Started by User-name‎, 03-11-2015 06:31 PM
    • Replies: 3
    • Views: 303
    03-11-2015, 10:35 PM Go to last post
  36. Exclamation Which method to solve...

    I just need direction...which method do I use to solve these two problems... 1) 2011 NYC had such and such number of accidents between Mon-Fri,...

    Started by newmommy‎, 03-10-2015 10:52 PM
    • Replies: 1
    • Views: 195
    03-11-2015, 07:48 AM Go to last post
  37. [ASK] Combination?

    5. A bag contains 7 red marbles and 5 yellow marbles. From the bag, 3 marbles are taken randomly at once. How many ways exist if all 3 taken marbles...

    Started by Monox D. I-Fly‎, 03-10-2015 09:56 PM
    • Replies: 0
    • Views: 133
    03-10-2015, 09:56 PM Go to last post
  38. Question Counting question

    4 selections of single digits are made at random with replacement, from the 10 digits 0-9. Find the probability that these sum to 20. I thought...

    Started by MathJack‎, 03-09-2015 04:44 PM
    • Replies: 1
    • Views: 318
    03-10-2015, 02:24 AM Go to last post
  39. Post Distribution of Sample Mean Question

    Hi, I have a bit of a problem with constructing a sampling distribution of the mean. The question itself is relatively simple: A population...

    Started by Bill_McCoy‎, 03-07-2015 03:40 AM
    • Replies: 1
    • Views: 264
    03-07-2015, 05:23 AM Go to last post
  40. Determine distribution given moment generating function

    I am given two moment generating functions, and need to calculate some probabilities regarding them. The first is: M(t) = ((2/3)e^t + (1/3))^3 ...

    Started by Lanuk‎, 03-05-2015 11:44 PM
    • Replies: 1
    • Views: 249
    03-06-2015, 01:49 AM Go to last post
  41. Red face Probability help

    never mind, solved it

    Started by youngmusashi‎, 03-05-2015 04:25 PM
    help me!, probability
    • Replies: 0
    • Views: 222
    03-05-2015, 04:25 PM Go to last post
  42. Post Binomial Distribution Question

    Hey guys, I have a bit of trouble understanding this binomial distribution question According to the call center statistics of a company, on...

    Started by Bill_McCoy‎, 03-05-2015 04:27 AM
    • Replies: 5
    • Views: 301
    03-05-2015, 09:43 AM Go to last post
  43. Probability help for a beginner

    Hi all, I've spent a long time analysing football (soccer) matches to rate teams and try and work out probabilities of various teams winning. ...

    Started by Fortesque‎, 03-02-2015 02:22 PM
    • Replies: 0
    • Views: 229
    03-02-2015, 02:22 PM Go to last post
  44. Game probability query

    I'm trying to develop a game idea - a kind of passport bingo. 200 people each have passports. Each passport has a 9 digit number. If I read out a...

    Started by davidehc‎, 02-27-2015 06:05 AM
    • Replies: 0
    • Views: 240
    02-27-2015, 06:05 AM Go to last post
  45. Question Poisson Distribution with two different expected value

    Question: Suppose there are number of accidents at location A and location B each day with Poisson Distribution with rate 0.001 and the number of...

    Started by Asano‎, 02-25-2015 11:03 AM
    mixed distribution, poisson distribution, probability, statistics
    • Replies: 2
    • Views: 461
    02-26-2015, 06:38 AM Go to last post
  46. Second Order Stochastic Dominance

    how can I test for second order stochastic dominance? is easy to understand the idea but when I have to normal distributions with different means and...

    Started by santicanel‎, 02-25-2013 08:02 PM
    • Replies: 2
    • Views: 1,015
    02-25-2015, 02:42 PM Go to last post
  47. Question Mixed Poisson Distribution Help

    Question: The number of accidents follows a Poisson distribution with mean 12. Each accident generates 1, 2 or 3 claimants with probabilities...

    Started by Asano‎, 02-25-2015 10:56 AM
    actuarial, homework help, probability, statistics
    • Replies: 1
    • Views: 206
    02-25-2015, 01:12 PM Go to last post
  48. Statistics HEEELLPPP!!

    A lot of 1000 components contains 250 that are defective. Two components are drawn at random and tested. Let A be the event that the first component...

    Started by Kcgiggles‎, 02-24-2015 09:02 PM
    • Replies: 1
    • Views: 276
    02-24-2015, 10:14 PM Go to last post
  49. Question Symbol for Mean of Probability Distribution

    “mu” is the symbol for the mean of a population, “x-bar” is the symbol for the mean of a sample, and “mu of x-bar” is the symbol for the mean of the...

    Started by DrAnthonyRodriguez‎, 02-24-2015 09:10 AM
    • Replies: 1
    • Views: 218
    02-24-2015, 10:48 AM Go to last post
  50. Help! HW: Family with 6 children, gender and birth

    Problem 2.1.5 from Basic Concepts of Probability and Statistics, 2nd Ed. by Hodges and Lehmann Suppose you know that a family has 6 children, 2...

    Started by yl2j‎, 02-22-2015 01:32 PM
    • Replies: 0
    • Views: 247
    02-22-2015, 01:32 PM Go to last post
  51. Trying to handicap the outcome of a race based on given probabilities

    Hello everyone. The past year or so I've been generating projection models for various sports to predict the performance of individual players....

    Started by huitcinq‎, 02-20-2015 04:22 PM
    distribution probability, probabilities, sports
    • Replies: 0
    • Views: 246
    02-20-2015, 04:22 PM Go to last post
  52. Distribution of β hat sigma hat

    This is my problem: Find the distributions of β-hat and σ2-hat for Yi = βxi + εi Is this prove sounds right?

    Started by aytajalli‎, 02-20-2015 11:50 AM
    • Replies: 1
    • Views: 294
    02-20-2015, 12:04 PM Go to last post
  53. Normal Distribution times constant

    I can't seem to find anything about this on the web. If I have a random variable distributed Normally: x ~ Normal(mean,variance) is the...

    Started by BigBugBuzzz‎, 09-30-2012 09:45 AM
    normal distribution
    • Replies: 4
    • Views: 10,602
    02-18-2015, 08:45 PM Go to last post
  54. Question Questions about the CLT

    The Central Limit Theorem (CLT) involves taking repeated samples of size n from a population. That is, the process involves two things: the number...

    Started by DrAnthonyRodriguez‎, 02-18-2015 09:20 AM
    clt
    • Replies: 1
    • Views: 262
    02-18-2015, 10:11 AM Go to last post
  55. D&D GM Needs Help Calculating Stat-Upgrades

    Hello! I've never taken a stat class, so bear with me if this seems basic. I have searched for a while for a solution to this, but nothing has been...

    Started by Marshmeloo‎, 02-17-2015 04:43 AM
    • Replies: 3
    • Views: 342
    02-17-2015, 11:45 PM Go to last post
  56. [ASK] Combination: Am I Doing This Right?

    Among 10 candidates of Students Council members, 3 people will be selected to undergo training. The number of possible ways to do so if 1 candidate...

    Started by Monox D. I-Fly‎, 02-14-2015 01:01 AM
    • Replies: 2
    • Views: 290
    02-17-2015, 09:06 PM Go to last post
  57. Unhappy Probability Question - Express in terms of P

    Hi, I am currently stuck on a probabilities question and I was wondering if anyone could help me a bit. A and B are two events. Suppose that ...

    Started by Bill_McCoy‎, 02-16-2015 07:07 AM
    express in terms of p, independent, probabilities
    • Replies: 1
    • Views: 252
    02-17-2015, 03:51 PM Go to last post
  58. Probablility question

    If the odds of winning a game are 1 in 10 what are the odds of winning that game three times in a row? Thanks for your help!

    Started by amynkaya@yahoo.com‎, 02-16-2015 11:45 AM
    • Replies: 0
    • Views: 218
    02-16-2015, 11:45 AM Go to last post
  59. Probability question

    For the 1st part of the question do I use Baye's Theorem? e.g. Required probability = 0.25*0.35/= 0.30 - using Baye's Theorem And can anyone...

    Started by tvtokyo‎, 02-16-2015 06:56 AM
    probability
    • Replies: 0
    • Views: 234
    02-16-2015, 06:56 AM Go to last post
  60. Basketball shooting percentage - binomial distribution?

    I am interested in studying the probability of team field goal percentage being unusually high. In context, I recently watched a women's college...

    Started by DRMORRIS‎, 02-14-2015 12:59 PM
    • Replies: 3
    • Views: 355
    02-15-2015, 10:59 AM Go to last post

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