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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: 12,564
    09-30-2005, 09:44 AM Go to last post
  1. Probability to win

    Hello, I would like to calculate the probability to win 3 times in a lottery considering the following: 1 - the chance to win 1 time is 1 in...

    Started by Marcus5800‎, Yesterday 07:21 PM
    lottery
    • Replies: 0
    • Views: 33
    Yesterday, 07:21 PM Go to last post
  2. probability of choosing number

    I have a question related to probability of choosing numbers. If there is 5 people picking numbers from 1 to 5, there is 5^5 ways to pick...

    Started by ikemen‎, Yesterday 01:03 AM
    • Replies: 0
    • Views: 66
    Yesterday, 01:03 AM Go to last post
  3. Question Bayes's Theorem

    Hi! Say there is a deck of 100 cards: Red w/ numbers = 40 Red w/ figures=15 Black w/ numbers=35 Black w/ figures=10 The only information...

    Started by DrAnthonyRodriguez‎, 05-22-2015 07:42 AM
    bayes' theorem
    • Replies: 4
    • Views: 130
    05-23-2015, 03:22 AM Go to last post
  4. probability of 8 successes out of 256 events

    Hi all hope you are well, i was trying to calculate what the probability of getting exactly 8 successes in 256 events. I used a Binomial on line...

    Started by censura‎, 05-21-2015 02:44 AM
    • Replies: 4
    • Views: 218
    05-23-2015, 12:29 AM Go to last post
  5. Probability definition

    Hi stats guys, I had a heated discussion about the following situation today: Letís say I have a function f(x) producing values between 0 and...

    Started by Stats_Newbie‎, 05-22-2015 09:48 AM
    • Replies: 6
    • Views: 128
    05-22-2015, 10:40 AM Go to last post
  6. A little help

    I know that a event with two outcomes such as making a three throw in basketball doesn't necessarily have a probability of 0.50, it could range...

    Started by misterx‎, 05-16-2015 08:41 AM
    • Replies: 1
    • Views: 222
    05-18-2015, 07:42 AM Go to last post
  7. differential distribution frequency

    Hi there. pls I'm studying the production of energy from sawdust.So I need a firm grip in powder technology.Can anyone pls show me mathematically how...

    Started by PSDman‎, 05-14-2015 03:26 PM
    • Replies: 0
    • Views: 142
    05-14-2015, 03:26 PM Go to last post
  8. Bayesian Convergence

    I have to go to bed any minute, so I apologize for the lack of detail provided. I was thinking about repeated testing and how probabilities...

    Started by hlsmith‎, 05-10-2015 10:04 PM
    • Replies: 7
    • Views: 288
    05-13-2015, 03:26 AM Go to last post
  9. Combination of families of fragility curves (cumulative probability functions)

    Hi guys, I am a geotechnical engineer and currently involved in a project for risk calculation of an embankment dam. It's my first post here, I am...

    Started by sandreev‎, 05-11-2015 09:42 AM
    conditional probability, engineering, fragilities, uni-modal limits theorem
    • Replies: 0
    • Views: 126
    05-11-2015, 09:42 AM Go to last post
  10. Wink Probability on Roulette. Just curious!

    Hello all. Could you help me? I have been discussing the following topic with my work teammates; We were talking about statistics and...

    Started by thenewone‎, 05-08-2015 07:30 PM
    bayers theorem, chaos, random, roulette
    • Replies: 2
    • Views: 219
    05-11-2015, 09:26 AM Go to last post
  11. Probability of relations in a network

    Imagine i have a predicate $friends(p_1, p_2)$ and I know that $p(friends(p_1, p_2)) = p_1$. If I generate a world of $n$ people, I expect there to...

    Started by d.hammer‎, 05-08-2015 07:29 AM
    graph, probability
    • Replies: 0
    • Views: 126
    05-08-2015, 07:29 AM Go to last post
  12. Google Earth circles probability

    Hi everyone. Not sure if this is the right forum but I'll give it a go. Q: If you draw a circle on a sphere, what are the odds that a randomly...

    Started by BedrockGeometry‎, 05-07-2015 05:27 AM
    • Replies: 3
    • Views: 188
    05-07-2015, 08:58 AM Go to last post
  13. dice rolling odds. please help!

    Suppose you have a FIVE sided dice. One of the sides has a star on it, the other four sides are blank. Suppose you rolled it 10 times. What are the...

    Started by ospreyx‎, 05-06-2015 06:59 PM
    dice, odds, probability, statistics
    • Replies: 1
    • Views: 132
    05-06-2015, 08:38 PM Go to last post
  14. Data probability/density

    Hi, hope im in the right place. Im trying to find the best way to characterize the different data on this space? to 3 draw regions (or lines with...

    Started by barakah‎, 05-01-2015 09:47 AM
    • Replies: 4
    • Views: 283
    05-01-2015, 03:45 PM Go to last post
  15. Simple concrete example of Wold theorem?

    I'm reading the Wold decomposition theorem for time series in http://faculty.chicagobooth.edu/john.cochrane/research/papers/time_series_book.pdf. ...

    Started by JustAengineer‎, 04-29-2015 10:25 PM
    time series, wold theorem
    • Replies: 0
    • Views: 208
    04-29-2015, 10:25 PM Go to last post
  16. Probabilities and Monte-Carlo simulations - How to rank?

    I'm not that statistically clued up within this particular area but it's an issue I am facing for work (bizarrely) and am having trouble of working...

    Started by winters‎, 04-27-2015 02:35 PM
    • Replies: 8
    • Views: 332
    04-28-2015, 10:45 AM Go to last post
  17. Poll Poll: A probability problem

    Hi all, I would like to solve the problem bellow. To some it might seem to eassy. However i would appreciate some hints. Thanks in advance ... ...

    Started by marius15‎, 04-26-2015 08:49 AM
    • Replies: 7
    • Views: 287
    04-26-2015, 04:51 PM Go to last post
  18. Binomial question?

    I have this question that I think is binomial probability. Bananas that are almost ripe to pick carry the chance of being 15% rotten. What would be...

    Started by chrismyers1‎, 04-23-2015 09:42 AM
    • Replies: 3
    • Views: 258
    04-26-2015, 02:11 PM Go to last post
  19. 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, 04-18-2015 11:39 AM
    baseball, compound probability, probability
    • Replies: 4
    • Views: 269
    04-26-2015, 10:01 AM Go to last post
  20. 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: 5
    • Views: 306
    04-26-2015, 09:29 AM Go to last post
  21. Do independent experiments lend extra weight to probability?

    There are two categories of objects, A and B. From long term observation, experiment 1 is known to be 70% accurate i.e. it predicts type A or B...

    Started by Nquisitive‎, 04-24-2015 02:39 PM
    combining probabilities, independent experiments
    • Replies: 2
    • Views: 222
    04-25-2015, 02:01 AM Go to last post
  22. 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
    5 Pages
    1 2 3 ... 5
    • Replies: 71
    • Views: 2,193
    04-22-2015, 06:50 AM Go to last post
  23. How to calculate these 3 questions ? Please help

    How to calculate these 3 questions ? :shakehead I want to know the steps and answer, thank you

    Started by peter369369‎, 04-21-2015 10:19 AM
    • Replies: 1
    • Views: 260
    04-21-2015, 10:30 AM Go to last post
  24. task about CTR

    Hi guys! I have a question: There is link on the main google page with CTR 1.5% (CTR is number of clicked visitors divided by number of all...

    Started by bchep‎, 04-19-2015 11:51 AM
    • Replies: 0
    • Views: 147
    04-19-2015, 11:51 AM Go to last post
  25. 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: 215
    04-18-2015, 01:40 AM Go to last post
  26. 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: 231
    04-15-2015, 10:20 PM Go to last post
  27. 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: 149
    04-15-2015, 06:44 AM Go to last post
  28. 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: 154
    04-14-2015, 01:12 PM Go to last post
  29. 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: 122
    04-14-2015, 01:03 AM Go to last post
  30. 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: 183
    04-12-2015, 10:53 AM Go to last post
  31. 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: 286
    04-11-2015, 07:36 PM Go to last post
  32. 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: 158
    04-11-2015, 04:59 PM Go to last post
  33. 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: 228
    04-08-2015, 01:25 PM Go to last post
  34. 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: 3,824
    04-06-2015, 05:11 PM Go to last post
  35. 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: 190
    04-06-2015, 06:44 AM Go to last post
  36. 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: 210
    04-05-2015, 04:30 PM Go to last post
  37. 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: 173
    04-02-2015, 05:00 AM Go to last post
  38. 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: 273
    04-01-2015, 12:55 PM Go to last post
  39. 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: 186
    03-30-2015, 07:48 AM Go to last post
  40. 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: 204
    03-30-2015, 06:33 AM Go to last post
  41. 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: 198
    03-27-2015, 12:25 PM Go to last post
  42. 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: 267
    03-25-2015, 05:16 PM Go to last post
  43. 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: 271
    03-23-2015, 04:37 PM Go to last post
  44. 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: 367
    03-21-2015, 06:38 PM Go to last post
  45. 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: 325
    03-21-2015, 02:30 PM Go to last post
  46. 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: 258
    03-20-2015, 12:52 PM Go to last post
  47. 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: 283
    03-20-2015, 08:33 AM Go to last post
  48. 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: 230
    03-19-2015, 08:20 AM Go to last post
  49. 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: 475
    03-18-2015, 03:39 PM Go to last post
  50. 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: 194
    03-18-2015, 07:58 AM Go to last post
  51. 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: 518
    03-17-2015, 06:29 AM Go to last post
  52. 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: 319
    03-14-2015, 04:33 PM Go to last post
  53. 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: 234
    03-14-2015, 05:48 AM Go to last post
  54. 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: 200
    03-13-2015, 12:43 PM Go to last post
  55. 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: 341
    03-13-2015, 03:14 AM Go to last post
  56. 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: 353
    03-11-2015, 10:35 PM Go to last post
  57. 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: 257
    03-11-2015, 07:48 AM Go to last post
  58. [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: 173
    03-10-2015, 09:56 PM Go to last post
  59. 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: 362
    03-10-2015, 02:24 AM Go to last post
  60. 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: 311
    03-07-2015, 05:23 AM Go to last post

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