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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: 30,249
    09-30-2005, 09:44 AM Go to last post
  1. Can't figure out probability question...

    Ok, so I'm completely lost in my Statistics class and I really need help on this problem. I think if I figure this one out, it will help with the...

    Started by statshelp31‎, 10-19-2009 09:00 PM
    • Replies: 1
    • Views: 14,125
    10-20-2009, 10:52 AM Go to last post
  2. Can't figure out the correct formula

    We do a lot of A/B(/C...) testing on our e-commerce sites. I'm putting together a dashboard to display the results from the testing. But I can't come...

    Started by topout‎, 11-10-2007 01:12 PM
    • Replies: 1
    • Views: 2,815
    11-16-2007, 12:55 PM Go to last post
  3. can't figure out the right formula!

    Hi everyone, I am taking a stats class and we are currently studying probability. I'm having issues with a question on the sample test as I simply...

    Started by soitgoes13‎, 06-23-2011 06:20 PM
    • Replies: 3
    • Views: 2,804
    06-23-2011, 07:12 PM Go to last post
  4. Can't justify 'correct' answer

    I thought I understood sampling without replacement fairly well, but this problem has me stumped as the answer that I calculate doesn't appear to be...

    Started by Brother Maynard‎, 07-27-2014 09:05 PM
    • Replies: 2
    • Views: 1,347
    07-29-2014, 07:29 PM Go to last post
  5. Can't reconcile probability information

    Hello there! I'm doing a review course in probability that I thought would be trivial. By and large, I'm not having any difficulty, but one...

    Started by alexandicity‎, 01-23-2010 08:30 PM
    • Replies: 2
    • Views: 2,398
    01-25-2010, 02:41 PM Go to last post
  6. Can't seem to figure this one out...

    This question must be trickier than I thought: A statistics professor and his wife are planning to take a 2-week vacation in Hawaii, but they...

    Started by furcal201‎, 03-02-2010 11:12 AM
    • Replies: 1
    • Views: 5,128
    03-02-2010, 02:35 PM Go to last post
  7. Can't seem to solve this p(x+y>1)

    Given f(x,y) = 3x/2 for 0<x<1 , -x<y<x Find P(x+y>1) .

    Started by saternal‎, 03-31-2012 04:43 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 5,462
    04-01-2012, 07:13 PM Go to last post
  8. Can't understand some probability symbols.

    For two events, A and B, P(A) =1/2, P(B) =1/3, and P(A �� B) =1/4. Find P(B | A). The symbol where is shows a box here is an upsidedown U. Does...

    Started by jsundsmo‎, 06-16-2007 02:58 PM
    • Replies: 2
    • Views: 21,917
    06-17-2007, 01:00 AM Go to last post
  9. Can't understand what this question means

    Let X and Y have exponential distributions Exp(3) (i.e, with the parameter 3) We assume that X and Y are independent. Let U=x+2Y and V=-x+Y....

    Started by saternal‎, 04-03-2012 08:35 AM
    • Replies: 5
    • Views: 1,982
    04-05-2012, 07:23 AM Go to last post
  10. candy

    A candy store owner has daily demand Y for a certain brand of candy sold from the bulk bins. Suppose the owner will never stock more than one...

    Started by megs915‎, 10-24-2005 12:05 PM
    • Replies: 5
    • Views: 4,658
    10-25-2005, 04:51 PM Go to last post
  11. 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: 2,794
    02-23-2006, 11:27 PM Go to last post
  12. cant decide null and alternative

    . Last fall, a sample of n= 36 freshmen was selected to participate in a new 4-hour training program designed to improve study skills. To evaluate...

    Started by SadieKhan‎, 10-20-2010 01:25 AM
    • Replies: 7
    • Views: 4,911
    10-21-2010, 06:41 AM Go to last post
  13. Cant figure out this question

    What are moments?

    Started by Porter1‎, 10-20-2009 11:39 PM
    • Replies: 0
    • Views: 2,292
    10-20-2009, 11:39 PM Go to last post
  14. cant tell if i am on right track for this prababilitly hw assigment help would good!

    I was recently given a hw assigment dealing with the price is right's "money game". The contestant is shown nine cards on a board. Each card has one...

    Started by nyc914‎, 07-17-2012 05:03 PM
    • Replies: 2
    • Views: 1,538
    07-18-2012, 05:32 PM Go to last post
  15. Card draw and joint probability

    I wonder if I'm overthinking this and want confirmation... I'm in thought about how to apply (1) to find the probability of 2 not independent...

    Started by Lunaticfringe‎, 08-04-2013 06:09 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 5,381
    08-12-2013, 03:34 PM Go to last post
  16. Card Drawing Help!

    This is for a project I'm working on involving MtG. It began in a different form from an idea for a program I have, but this particular iteration is...

    Started by R4M3N‎, 08-16-2012 01:08 PM
    • Replies: 2
    • Views: 1,312
    08-16-2012, 01:48 PM Go to last post
  17. Card drawing probability

    Hey all, I have been pondering about a problem in excel and cant seem to figure it out :/ Lets assume I have a card deck of 50 cards. My opening...

    Started by CameronNY‎, 02-20-2017 03:29 PM
    • Replies: 5
    • Views: 1,488
    02-21-2017, 02:47 AM Go to last post
  18. Card Game Probability Question!

    The game is screw your neighbor! Four card players at a table. Two players have 1 chip two players have 2 chips. The player who gets delt the low...

    Started by chad‎, 07-27-2011 02:25 PM
    • Replies: 1
    • Views: 1,724
    07-27-2011, 05:35 PM Go to last post
  19. Card guessing problem

    I took statistics & probability in college, but, for some reason, I seem to have a mental block on how certain things work. I never know which...

    Started by eleasmom‎, 05-09-2011 02:18 AM
    • Replies: 4
    • Views: 3,493
    05-15-2011, 04:26 AM Go to last post
  20. Card Pairs Problem with a Twist (TV Gameshow)

    Hi I'm working out a solution for a TV gameshow which leads me to a problem... I'd like to know the probability of finding a pair of cards in the...

    Started by Brian Factor‎, 05-03-2012 04:50 AM
    • Replies: 0
    • Views: 1,514
    05-03-2012, 04:50 AM Go to last post
  21. Card Prob.

    A deck of cards has all the face cards removed - Aces, Kings, Queens, and Jacks. There are 36 left in the deck, if two cards were drawn at the same...

    Started by HikariT‎, 06-01-2008 02:26 PM
    • Replies: 8
    • Views: 3,846
    06-01-2008, 05:24 PM Go to last post
  22. Card Probability

    Just want to make sure what im doing is correct. Out of a deck of 52 cards, 12 cards are selected at random w/o replacement, what is the...

    Started by ITman95‎, 11-20-2013 02:53 PM
    • Replies: 3
    • Views: 1,484
    11-20-2013, 03:57 PM Go to last post
  23. Card Probability Problem

    I seem to have a brain cramp and need some help. A card is chosen randomly from a standard deck of 52 cards and replaced. On average, how many...

    Started by robozak‎, 09-22-2011 05:49 PM
    • Replies: 2
    • Views: 2,135
    09-23-2011, 05:04 PM Go to last post
  24. Card Probability Problems

    Scenario: If you have a standard deck of 52 cards and you draw 2 of those cards without replacement, what is the probability of: 1) P(getting a...

    Started by SausageWater‎, 06-09-2017 05:58 PM
    • Replies: 1
    • Views: 684
    06-15-2017, 04:59 PM Go to last post
  25. Cool Card Problem

    Hi everyone, My problem is something like this: I have a deck of cards, without jokers (52 cards total). 30 cards are dealt. What is the...

    Started by ttactics‎, 09-28-2011 04:11 PM
    card
    • Replies: 1
    • Views: 1,566
    09-28-2011, 04:27 PM Go to last post
  26. Card Problem--(More than meets the eye...hopefully)

    Hmm, wondering if anyone can solve this problem, and possibly know which game show it came from: Say that you have 3 cards you can choose from:...

    Started by cytoplasmic‎, 12-14-2007 03:27 AM
    • Replies: 2
    • Views: 3,229
    12-14-2007, 07:45 PM Go to last post
  27. Cards (probability)

    What is the chance that the fifth card from the top of the deck will be a heart? Here is my attempt (I think it's outright wrong at the moment......

    Started by Niax‎, 07-10-2012 09:09 AM
    • Replies: 3
    • Views: 1,818
    07-10-2012, 05:34 PM Go to last post
  28. Cool Care to place a bet? (probability guru needed)

    I consider myself pretty good when it comes to math and probabilities, but this has me stumped. It's your lucky day! A man offers you a fair coin...

    Started by meridian‎, 03-04-2014 01:24 PM
    • Replies: 1
    • Views: 2,099
    03-04-2014, 10:14 PM Go to last post
  29. Carnival game of Under-Or-Over 7?

    I am sorry lmao.

    Started by person‎, 11-15-2016 10:37 AM
    • Replies: 1
    • Views: 2,979
    11-15-2016, 11:24 AM Go to last post
  30. Categorizing a question: binomial OR normal OR normal approx. of binomial.

    *************Please ingore this question************ *********It's actually a 'Distribution of the Sample Means' question******* What...

    Started by pcampin‎, 02-21-2012 02:41 PM
    • Replies: 0
    • Views: 2,095
    02-21-2012, 02:41 PM Go to last post
  31. 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 07:16 AM
    • Replies: 0
    • Views: 1,810
    09-15-2016, 07:16 AM Go to last post
  32. Cauchy-Schwarz inequality: cov(X,Y)]^2 ≤ var(X) var(Y)

    Suppose that X andy Y are (scalar) random variables. Show that ^2 ≤ var(X) var(Y). (Cauchy-Schwarz inequality) Sow that equality holds if and...

    Started by kingwinner‎, 10-10-2009 06:03 PM
    • Replies: 0
    • Views: 17,451
    10-10-2009, 06:03 PM Go to last post
  33. Cdf

    Can someone explain how to solve this? I have to find the CDF for the following function: F(X) = 1/2 * Exp (-|X|) dx , (-inf < x < +inf) I know...

    Started by jamesmartinn‎, 10-03-2008 10:36 AM
    • Replies: 1
    • Views: 1,898
    10-03-2008, 12:51 PM Go to last post
  34. CDF - Cauchy distribution

    Suppose that a particle is fired from the origin in the (x, y)-plane in a straight line in a direction at a random angle theta(the symbol with the...

    Started by StatStudent3‎, 11-01-2010 04:04 PM
    • Replies: 3
    • Views: 7,396
    11-01-2010, 05:59 PM Go to last post
  35. Question cdf and pdf

    consider the following cumulative distribution function F(x) = 0, x<0 =\frac{x+k}{5}, k\leq x<k+1, k=0,1,2 =1, x\geq3 find P(X=j) for all...

    Started by Sambit‎, 11-01-2010 09:53 AM
    • Replies: 9
    • Views: 3,334
    11-01-2010, 12:03 PM Go to last post
  36. CDF of a PDF with a negative power

    I need to solve the following problem: For a marine hull insurance policy, a claim occurs with probability 0.DD, where DD represents the two...

    Started by endlessend25‎, 03-03-2017 12:19 PM
    density function, self-study
    • Replies: 3
    • Views: 2,298
    03-04-2017, 12:06 AM Go to last post
  37. CDF of difference of chi squared random variables

    Hi, I posted this question under "Probability Theory" and got no response. Maybe I'd have better luck here? I'm interested in obtaining a...

    Started by rhz‎, 11-10-2011 01:15 PM
    • Replies: 1
    • Views: 8,624
    11-10-2011, 03:50 PM Go to last post
  38. CDF of difference of two independent non-central chi square RVs each 1 d.o.f.

    Hi Everyone. I'm glad to have found this forum. This is my first post. I'm interested in obtaining a simple expression (exact or approximate)...

    Started by rhz‎, 10-28-2011 02:30 PM
    • Replies: 0
    • Views: 1,924
    10-28-2011, 02:30 PM Go to last post
  39. CDF problem

    Problem - Let X be a random variable with c.d.f. F(x). Find the c.d.f. of aX + b first for a > 0, then for a < 0. (for a > 0) F(x) = P(X <= x) ...

    Started by StatStudent3‎, 10-30-2010 04:59 PM
    • Replies: 8
    • Views: 8,073
    11-02-2010, 04:24 PM Go to last post
  40. CDF question

    It is proposed to model the annual salaries X (in $) paid to people in a particular occupation using the continuous cumulative distribution function:...

    Started by capo_mo‎, 11-03-2006 03:18 AM
    • Replies: 2
    • Views: 2,097
    11-06-2006, 05:49 PM Go to last post
  41. Cell phone mean and standard deviation

    A recent study "privacy and data management on mobile decies"the pew research center, Showed that 18.6% had their location tracking feature turned...

    Started by Neelo‎, 09-29-2012 02:57 PM
    • Replies: 5
    • Views: 2,649
    09-29-2012, 03:38 PM Go to last post
  42. censored data

    You put a simple defect into a car and have six randomly selected auto repair shops from city X look at it, one after the other. All six want to...

    Started by Outlier‎, 07-11-2012 07:55 PM
    • Replies: 2
    • Views: 1,626
    07-12-2012, 12:28 PM Go to last post
  43. Unhappy Central limit problem

    Hi, I've been struggling with the below and have no idea how to tackle it. I've looked at the mgf but this doesn't seem to work out. Intuitively I...

    Started by Gekko‎, 08-23-2010 09:42 PM
    • Replies: 3
    • Views: 2,965
    08-24-2010, 10:30 AM Go to last post
  44. Central Limit Theorem

    It has been determined that the average cost to develop a 30 second commericial is 20,000 with a standard deviation of 3000 What is the...

    Started by sharons‎, 09-18-2007 07:20 AM
    • Replies: 0
    • Views: 2,624
    09-18-2007, 07:20 AM Go to last post
  45. Central Limit Theorem

    I have been trying for 3 hours and can not figure out what to do. My teacher included this section and it was not in the textbook. I do not know what...

    Started by whiteyfrom773‎, 03-15-2009 01:16 PM
    • Replies: 1
    • Views: 3,044
    03-15-2009, 01:27 PM Go to last post
  46. central limit theorem

    The central limit theorem can be used to analyze round-off error. Suppose that the round-off error on one number is represented as a uniform random...

    Started by sonpham‎, 10-12-2011 07:32 PM
    • Replies: 0
    • Views: 1,916
    10-12-2011, 07:32 PM Go to last post
  47. Question Central Limit Theorem

    True or False. According to the Central Limit Theorem, the expected value for a sample mean approaches 0 as the sample size approaches infinity. I...

    Started by lchurchill‎, 07-01-2013 07:53 PM
    • Replies: 1
    • Views: 2,265
    07-01-2013, 07:55 PM Go to last post
  48. Central Limit Theorem

    If X is a Gamma(n,1). For which values of n we have P(|\frac{X}{n}-1|>0.01)<0.1 If n=n_0 is the first value of n that satisfies the above equation,...

    Started by askazy‎, 12-06-2014 10:55 AM
    • Replies: 3
    • Views: 1,794
    12-08-2014, 06:25 AM Go to last post
  49. Central limit theorem - Approximation the Sum of Bernoullis to Normal Distribution

    Hello, I'm new in this forum and I would like to ask for your help. I have a set of Independent Bernoulli random variables, but they are not...

    Started by guerreiro74‎, 06-18-2013 07:34 AM
    approximation, bernoulli, clt, not iid
    • Replies: 9
    • Views: 2,450
    06-19-2013, 02:47 PM Go to last post
  50. Central Limit Theorem and Exponential Distribution

    Exponential Distribution with lambda = 1/2. Use the central limit theorem to estimate the probability that the average service time of the first n...

    Started by simplemts‎, 10-15-2012 02:30 AM
    • Replies: 1
    • Views: 3,882
    10-15-2012, 02:33 AM Go to last post
  51. central limit theorem basic question

    I have a basic question concerning the central limit theorem let the 2 by one vectors x1, x2, ..., xn come from a population with mean μ=' , and...

    Started by leo nidas‎, 06-17-2010 12:42 PM
    • Replies: 1
    • Views: 2,786
    06-17-2010, 02:47 PM Go to last post
  52. Central Limit Theorem Problem

    Hey folks, I am working on this problem and found several solutions, but none the same! A business ships its products, variable in weight,...

    Started by Slime‎, 01-26-2013 12:01 PM
    • Replies: 1
    • Views: 1,921
    01-26-2013, 12:39 PM Go to last post
  53. Exclamation central limit theorem problem 2, is this right?

    Suppose the time in days until a component fails has the gamma distribution with alpha=5 and theta = 1/10. When a component fails, it gets...

    Started by omega‎, 11-21-2010 02:54 PM
    • Replies: 0
    • Views: 2,327
    11-21-2010, 02:54 PM Go to last post
  54. central limit theorem question check?

    Hi! The question states: "Suppose that, historically, one-third of the graduating seniors at a certain college have two parents who attend the...

    Started by Seratina‎, 10-28-2007 03:06 PM
    • Replies: 0
    • Views: 4,662
    10-28-2007, 03:06 PM Go to last post
  55. Angry central limit theorm help

    Z1,Z2,.... are identically independently distributed with uniform distribution . How do i use the central limit theorem to estimate the the...

    Started by omega‎, 11-20-2010 08:27 PM
    • Replies: 1
    • Views: 2,022
    11-21-2010, 01:51 PM Go to last post
  56. central limit theorm problem

    Suppose the service time in minutes at a bank has the exponential distribution with lambda = 1/2. Use the central limit theorem to estimate the...

    Started by omega‎, 11-21-2010 02:44 PM
    • Replies: 0
    • Views: 1,930
    11-21-2010, 02:44 PM Go to last post
  57. central limit theory question

    hi: I have a exam coming up Monday and in reviewing the sample questions, I hit a snag and was looking for some help. The question is as follows:...

    Started by senorkoki‎, 03-12-2011 09:28 PM
    • Replies: 1
    • Views: 2,476
    03-12-2011, 11:30 PM Go to last post
  58. 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: 3,880
    11-28-2005, 11:35 PM Go to last post
  59. Central Limit Thrm / Chebyshev Problem

    Suppose the price of a particular stock changes from day to day according to the following model. If Yn is the price of the stock on day n, then Yn =...

    Started by tlanz‎, 05-02-2013 09:57 PM
    • Replies: 3
    • Views: 2,337
    05-03-2013, 01:21 AM Go to last post
  60. 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: 3,807
    11-11-2008, 07:39 PM Go to last post

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