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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: 30,320
    09-30-2005, 09:44 AM Go to last post
  1. P-value from test statistic

    I'm given a test-statistic of 2.4 in one of those H0 type problem with a 0.05 significance level. In the z-table, if you look up 2.4, it says 0.0082....

    Started by robbiesqp‎, 12-11-2009 07:02 PM
    • Replies: 8
    • Views: 34,913
    01-01-2015, 10:33 PM Go to last post
  2. Joint distributions for Order Statistics

    I have a problem with part b of this question. I found the joint distribution and seem to have problem integrating it. I seem to have gotten a double...

    Started by bk123‎, 04-26-2013 12:45 PM
    • Replies: 8
    • Views: 2,615
    04-17-2014, 10:50 AM Go to last post
  3. HELP! probability that a 7 digit number is divisible by 7?

    The seven digits {1; 2; 3; 4; 5; 6; 7} are written down in a random order. What is the chance that the resulting number is divisible by 7? For...

    Started by lincoln40113‎, 09-26-2013 02:06 PM
    • Replies: 8
    • Views: 3,300
    09-26-2013, 09:42 PM Go to last post
  4. A Box containing coins question

    If a box contains 4 pennies, 4 nickels, 4 dimes and 2 coins are selected at random WITH replacement and D (>=0) is the numerical difference between...

    Started by ITman95‎, 11-22-2013 03:31 PM
    • Replies: 8
    • Views: 2,162
    11-25-2013, 04:37 PM Go to last post
  5. Probability GIVEN I already know some event has occurred

    I ask 14 people to buy something, 2 say yes, 12 say no. Given this happened, what is the probability that the next person I ask will buy...

    Started by jnscollier‎, 01-21-2014 09:44 PM
    conditional probability
    • Replies: 8
    • Views: 1,918
    01-23-2014, 02:23 AM Go to last post
  6. Throwing a ball

    Imagine a game where you throw a ball in to a box where are three sticks; the probability of the ball to throw down one stick is 75%, two sticks is...

    Started by lgon‎, 01-10-2014 10:23 AM
    game
    • Replies: 8
    • Views: 2,230
    01-11-2014, 04:18 AM Go to last post
  7. Probability in an "on-off" cycle

    A process runs in a cycle and has a wait time prior to and then after a period of activity. So say at time = 0 the process is "off" for a count of...

    Started by MikeC710‎, 05-03-2014 08:49 AM
    • Replies: 8
    • Views: 2,016
    05-03-2014, 10:43 AM Go to last post
  8. Prove that the SD of an asymmetric function is larger than the SD of a symmetric one

    How can I prove that the standard deviation of an asymmetric function (mean>median>mode) is larger than the standard deviation of a symmetric one...

    Started by Scrooge‎, 06-04-2014 12:52 PM
    • Replies: 8
    • Views: 1,704
    06-06-2014, 01:02 AM Go to last post
  9. Statistically different tops for 2 parabolas with non-normal distributed data

    For situation 1 and 2 from my data came two parabola relations between variables X and Y. (the two parabolas have both a maximum) My question is...

    Started by rob1‎, 07-30-2014 05:32 PM
    • Replies: 8
    • Views: 1,596
    08-08-2014, 11:20 AM Go to last post
  10. Set Completion Problem for a Set of Collectable Objects

    I'm trying to do some probability analysis for a digital collectable game called SolForge. There is a particular point in my analysis where I'm not...

    Started by Eyks‎, 08-09-2014 01:47 AM
    • Replies: 8
    • Views: 2,806
    08-10-2014, 05:09 AM Go to last post
  11. Please help me start this question.

    Consider an experiment where we roll a single die once and let X represent the number of dots that appear on the top face of the die. Suppose that...

    Started by LH-‎, 10-11-2014 04:06 PM
    dice, probability, unfair
    • Replies: 8
    • Views: 2,610
    10-12-2014, 11:19 AM Go to last post
  12. Joint Probability Distribution from Drawing 5 Cards

    Consider drawing 5 cards from a standard poker deck without replacement. I am attempting to construct a joint probability distribution table for 2...

    Started by wyngarth‎, 01-03-2015 03:40 PM
    • Replies: 8
    • Views: 3,355
    01-17-2015, 12:58 PM Go to last post
  13. 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: 2,569
    04-28-2015, 10:45 AM Go to last post
  14. A bet between a buddy and I regarding the lottery

    Hello all, My coworker is convinced that the Powerball lottery is rigged against those players purchasing more than one game (set of 6 randomly...

    Started by metamologist‎, 09-02-2015 07:48 PM
    • Replies: 8
    • Views: 1,893
    09-08-2015, 11:23 AM Go to last post
  15. Probability that P > 0.1 of a population from a small sample

    Hey guys! I'm having an issue here with calculating the probably that the proportion of a population is larger 10% using data from a small sample....

    Started by Hublestat‎, 01-28-2016 11:21 AM
    • Replies: 8
    • Views: 2,231
    02-01-2016, 08:52 AM Go to last post
  16. Estimating probability of malignancy in skin moles

    If a certain type of skin mole has 1% probability of malignant change over a lifetime, what is the probability of malignant change if a person has...

    Started by Ronald U.‎, 02-16-2016 04:28 PM
    • Replies: 8
    • Views: 1,632
    02-17-2016, 04:38 PM Go to last post
  17. Probability Distribution and Time?

    I saw the attached chart on an optionetics video on youtube and I'm struggling to understand it properly. It's a probability distribution placed...

    Started by tomydom‎, 05-26-2016 08:14 AM
    • Replies: 8
    • Views: 2,000
    06-09-2016, 11:24 PM Go to last post
  18. 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: 3,620
    12-12-2016, 01:57 AM Go to last post
  19. Expected number of tries to get all N balls

    We took my grandson to the Santa Cruz Boardwalk. He fell in love with the gondola ride. He wants to go back until he has ridden on all of the 32...

    Started by Jennifer Murphy‎, 04-25-2017 06:34 PM
    • Replies: 8
    • Views: 1,933
    04-27-2017, 10:10 PM Go to last post
  20. 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: 3,825
    01-17-2017, 11:45 AM Go to last post
  21. Negative Binomial Distribution for Variable Probabilities

    Hi, I wonder if someone can help me. I'm looking to estimate the probability of player a v player b winning a darts match where the player who...

    Started by jazzfish‎, 09-05-2017 10:51 AM
    • Replies: 8
    • Views: 550
    09-06-2017, 05:45 AM Go to last post
  22. Lightbulb probability help

    I'm not looking for simply the answer but i need to know the step by step solution process, and what formula you used if any to solve for it please....

    Started by ecohelp‎, 09-17-2005 09:32 PM
    • Replies: 7
    • Views: 5,146
    09-18-2005, 11:18 AM Go to last post
  23. two way tables

    Maybe there is no way to do this on this format. However, I am a bit stuck on a question about showing proportions on a two way table....probably...

    Started by greenatstats‎, 11-04-2005 01:11 AM
    • Replies: 7
    • Views: 4,364
    11-06-2005, 04:51 PM Go to last post
  24. Central Limit Theory?

    Hi everyone! Here's my problem: In a large population, 12.5% of all individuals have diabetes. (a) Seven of these individuals are sampled at...

    Started by abyss‎, 11-28-2005 07:44 PM
    • Replies: 7
    • Views: 3,887
    11-28-2005, 11:35 PM Go to last post
  25. Stats help Please!!!!

    This problem is driving me crazy! The length of time to complete a door assembly on an automobile factory assembly line is normally distributed...

    Started by becca3848‎, 12-16-2005 06:55 PM
    • Replies: 7
    • Views: 17,751
    12-18-2005, 01:56 PM Go to last post
  26. Continious random variable- Uniform.

    I'm having trouble with some questions. Problem 1. If we have a continious random variable X that is uniformly distributed on the interval...

    Started by Michelle‎, 12-18-2005 07:49 PM
    • Replies: 7
    • Views: 3,995
    12-18-2005, 09:14 PM Go to last post
  27. Unhappy finding probability

    According to the Bureau of Navel Standards, 75 percent of all people are "inners," (that is their belly buttons poke inward); everyone else is an...

    Started by summertigger‎, 12-18-2005 09:21 PM
    • Replies: 7
    • Views: 5,168
    04-27-2006, 01:03 PM Go to last post
  28. Question finding non-randomness in binomial successes?

    Hi, I've only had one semester of Stats, so this is probably a real newbie question. I'm having problems on deciding how to approach a specific...

    Started by amarkb‎, 01-02-2006 03:10 PM
    • Replies: 7
    • Views: 3,294
    01-04-2006, 08:04 AM Go to last post
  29. Newbie needs cheating probability

    Hello, I am hoping someone could shed some light on the following problem; I sure hope I explain it well enough. Student A and B are both...

    Started by jworth94‎, 02-02-2006 10:15 PM
    • Replies: 7
    • Views: 3,075
    02-04-2006, 09:02 PM Go to last post
  30. Unhappy Need Help on Probability Probs.

    :confused: I'm having trouble with some problems: 1) Suppose that in a family, the probability of a child having black hair is .45, the...

    Started by ajk003‎, 02-17-2006 03:37 PM
    • Replies: 7
    • Views: 3,144
    02-09-2008, 11:27 AM Go to last post
  31. Candy Slection

    There are five candy bars in a box and one of them is a snickers bar. If two children pick out two candies each what is the chace that I will get the...

    Started by soyun‎, 02-23-2006 07:31 PM
    • Replies: 7
    • Views: 2,800
    02-23-2006, 11:27 PM Go to last post
  32. probability

    The attendance at football games at a certain stadium is normally distributed. with a mean of 55,000 and a standard deviation of 4500 A)what is...

    Started by sweetx‎, 09-01-2006 07:21 PM
    • Replies: 7
    • Views: 2,797
    09-21-2006, 07:43 PM Go to last post
  33. standard distribution/probability

    Use the standard normal distributin table to find a) P(Z<1.00) B) P(0<Z<1.43)

    Started by sweetlady‎, 09-01-2006 08:48 PM
    • Replies: 7
    • Views: 2,520
    09-07-2006, 12:23 PM Go to last post
  34. Geometric probability

    How many times would you expect to tosss a balanced coin to obtain the first head? Ok, I have p(y) = q exp (y-1) * p Is q = 1-p? and I'm...

    Started by structstat‎, 09-08-2006 03:28 PM
    • Replies: 7
    • Views: 3,073
    09-10-2006, 05:17 PM Go to last post
  35. Probability Question

    Hi. Can someone point me in the right direction on how to solve this problem: A pair of dice is thrown. Let X be the higher of the two numbers...

    Started by lilaznjedi‎, 09-12-2006 10:09 PM
    • Replies: 7
    • Views: 2,864
    09-14-2006, 12:43 PM Go to last post
  36. Tree Diagram

    Can some please explain how the Tree Diagram works...

    Started by n2c2mm2nt‎, 09-27-2006 09:52 PM
    • Replies: 7
    • Views: 5,586
    09-29-2006, 11:18 AM Go to last post
  37. probability & trees

    I have been doing really well in my statistics class but i am stumped with this current problem. He wants us to draw a tree and solve for a few...

    Started by chr1ssy711‎, 10-01-2006 02:10 PM
    • Replies: 7
    • Views: 3,120
    10-01-2006, 03:38 PM Go to last post
  38. Exponential Distribution

    I am in a 400 level Probabilities/Stats class at my university and am stuck on a problem relating to exponential distribution. I will list the...

    Started by jaknowlden‎, 10-24-2006 08:40 PM
    • Replies: 7
    • Views: 9,918
    10-26-2006, 07:53 PM Go to last post
  39. Question Probability Question

    I just handed in a test and I'm wondering if I used the correct formula for the following problem; the problem stated (this is not verbatim), a...

    Started by LynnLicorish‎, 11-01-2006 12:09 PM
    • Replies: 7
    • Views: 2,467
    11-07-2006, 08:42 AM Go to last post
  40. Can you get me started?

    A television store owner figures that 45% of the customers entering the store will purchase an ordinary television set, 15% will purchase a plasma...

    Started by teacher2be‎, 11-06-2006 08:34 PM
    • Replies: 7
    • Views: 5,776
    11-09-2006, 07:39 AM Go to last post
  41. I Need Help Fast

    I HAVE AN EXAM ON WEDNESDAY AND CANNOT FIGURE OUT THESE TWO PROBLEMS FOR THE LIFE OF ME. IS THERE ANY WAY SOMEONE CAN TELL ME HOW TO DO THEM! 1. A...

    Started by ajones1225‎, 12-11-2006 03:54 PM
    • Replies: 7
    • Views: 3,285
    12-13-2006, 06:26 AM Go to last post
  42. WeilBull formula help

    Hi everyone, I attach this Excel file below, Its from a book I purchase. The question ask in the book, How can I estimate the probability that a...

    Started by Fin Fang Foom‎, 07-28-2007 12:01 PM
    • Replies: 7
    • Views: 3,565
    07-31-2007, 05:25 PM Go to last post
  43. Question Help with these two questions, please? I am confused!

    Hello Everyone, These are part of my unit on Binomial and Poisson distributions: 1) The average number of phone inquiries per day at the center...

    Started by fitnesskitty‎, 02-27-2008 02:17 PM
    • Replies: 7
    • Views: 2,550
    02-27-2008, 09:27 PM Go to last post
  44. rock paper scissors vs flipping a quarter

    hello everybody. thanks for your reply ahead of time. scenario 2 people 1 time only game of rock paper scissors vs flipping a quarter what are...

    Started by fcbspain‎, 04-05-2008 08:37 AM
    • Replies: 7
    • Views: 6,076
    04-09-2008, 08:46 AM Go to last post
  45. "Hepatitis" and "Golf" probabilities.

    I'm having some trouble with these... A test for Hepatitis A is 98% accurate: if a person has Hepatitis, the test will come out "positive" with...

    Started by DAI&DF‎, 05-31-2008 11:29 PM
    • Replies: 7
    • Views: 6,727
    06-01-2008, 06:51 PM Go to last post
  46. mixing distributions

    Hi there, Suppose I have the following situation (specifically I simulate the following situation): X follows Exponential(lam1) with...

    Started by leo nidas‎, 01-18-2009 06:03 PM
    • Replies: 7
    • Views: 4,348
    01-19-2009, 05:39 AM Go to last post
  47. Even Sum Problem

    How many subsets of three different integers between 1 and 90 inclusive are there whose sum is an even number?

    Started by iwonde‎, 10-08-2008 02:14 AM
    • Replies: 7
    • Views: 3,388
    10-09-2008, 08:27 AM Go to last post
  48. Conditional Probabillity- Check my work?

    Ok the problem goes like this: A small brewery has two bottling machines A & B. Machine A bottles 75% of all their bottles, and B bottles 25%. One...

    Started by KitsuMathTard‎, 10-12-2008 06:37 PM
    • Replies: 7
    • Views: 3,030
    10-13-2008, 04:49 PM Go to last post
  49. Derivative help

    I am having a problem completing a problem because of derivatives. I complete the work down to the part where I get lnL(theta) =nln(theta)- sum...

    Started by statsmom‎, 11-02-2008 12:01 AM
    • Replies: 7
    • Views: 2,703
    11-02-2008, 03:59 PM Go to last post
  50. Question Cereal Prizes

    Hi, I'm stumped on a probability question. Here's the situation...a cereal company gives away 3 different prizes in its boxes of cereal, with...

    Started by M_Brando‎, 11-10-2008 04:17 PM
    • Replies: 7
    • Views: 3,819
    11-11-2008, 07:39 PM Go to last post
  51. Please help me on a really easy probability question -_-

    I dont know why I cant get this, i know its not hard. Id really appreciate it if someone could clear this up for me =( If there are 72 multiple...

    Started by dvm‎, 11-10-2008 10:05 PM
    • Replies: 7
    • Views: 2,415
    11-11-2008, 12:16 PM Go to last post
  52. Question Strange Random Walk

    All, it's been a while since college and I need a bit of help with a (probably simple) question regarding random walks: I would like to prove...

    Started by bimmerforce‎, 01-22-2009 11:40 AM
    • Replies: 7
    • Views: 3,817
    01-22-2009, 02:56 PM Go to last post
  53. X + a log X, where X~Gamma

    Does anybody know anything about the distribution of X + a log X, where X is a gamma distributed random variable and a is constant?

    Started by pnoviko‎, 02-08-2009 11:29 AM
    • Replies: 7
    • Views: 3,994
    02-09-2009, 12:45 PM Go to last post
  54. probability homework help PLEASE just a point in direction. no answer needed.

    Q4. In a Gallup poll, 47% of the eligible women responding said that they would date a coworker. Suppose 350 employed women were selected at random....

    Started by jd254‎, 05-07-2009 03:31 AM
    • Replies: 7
    • Views: 3,746
    05-07-2009, 06:03 AM Go to last post
  55. prob of at least 2/phone number problem

    Here's an interesting problem I came upon A person wrote a phone number on a note and that was later lost. When he try to recollect, he can...

    Started by dknight237‎, 07-28-2009 08:54 PM
    • Replies: 7
    • Views: 4,045
    08-11-2009, 08:42 AM Go to last post
  56. Poisson counting process problem (not easy)

    Started by kingwinner‎, 10-13-2009 05:18 AM
    • Replies: 7
    • Views: 3,655
    10-18-2009, 10:32 PM Go to last post
  57. Poisson process: compute E[N(3) |N(2),N(1)]

    note: N(t) is the number of points in and N(t1,t2] is the number of points in (t1,t2]. Let {N(t): t≥0} be a Poisson process of rate 1. Evaluate...

    Started by kingwinner‎, 12-11-2009 08:04 AM
    • Replies: 7
    • Views: 3,696
    12-13-2009, 01:32 AM Go to last post
  58. Question probability problem

    Let, X is a random variable with MGF = exp{ 3t + 8t^2}. then P ( -4.84 < X < 9.6) = ? (A) equal to 0.700 (B) equal to 0.925 (C) equal to 0.975...

    Started by Sambit‎, 01-26-2010 10:48 AM
    • Replies: 7
    • Views: 3,213
    01-27-2010, 07:51 PM Go to last post
  59. Probablilty binomial distribution

    Keeping in mind that this is an excerpt from a novel, let us examine the probability, 0.7980, of a successful jump. If you were one of the l2-member...

    Started by jammy006‎, 02-01-2010 09:13 AM
    • Replies: 7
    • Views: 4,061
    02-01-2010, 03:40 PM Go to last post
  60. Odds of birthday on same day

    I'm confused about the following... Two people have their birthday on a specific day of the year. Are the odds 1:365 or 1:730 ? :confused: ...

    Started by MrConfused‎, 02-17-2010 06:08 PM
    • Replies: 7
    • Views: 12,507
    02-18-2010, 04:09 PM Go to last post

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