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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: 30,337
    09-30-2005, 09:44 AM Go to last post
  1. binomial probability question

    The probability of having a boy = .51 and the probability of having a girl = .49. Find the largest number, "x," that will make this statement...

    Started by kimdoocheol‎, 10-14-2009 01:34 AM
    • Replies: 6
    • Views: 3,589
    10-14-2009, 10:18 PM Go to last post
  2. Simple probability question. Involves drawing name for gift.

    We had a dinner with my family where we draw names to give gift this christmas. The only rule was to not pick our name. We did it a couple of time...

    Started by moris7‎, 10-09-2009 09:02 AM
    • Replies: 4
    • Views: 5,516
    10-14-2009, 10:08 PM Go to last post
  3. Help!!! Normal distribution probability problem..

    I don't know if anyone asked similar question before, but the problem asks: The physical fitness of a patient is often measured by the patient’s...

    Started by puretopaz‎, 10-13-2009 09:38 PM
    • Replies: 4
    • Views: 5,433
    10-14-2009, 12:47 PM Go to last post
  4. combinations and permutations

    hi all, can you all help me wif this question? 1. an art collector, who owns 10 paintings, is preparing her will. how many different ways can...

    Started by shangian_ng‎, 10-11-2009 05:12 AM
    • Replies: 3
    • Views: 3,358
    10-13-2009, 12:28 PM Go to last post
  5. Textbook Problem. Calculate E(Y2/Y1)

    Joint Probability Density Function: f(y1, y2) = 1/8 * y1 * e^(-1/2 * (y1 + y2)) where 0 < y1 < infinity and 0 < y2 < infinity (0 otherwise) y1 + y2...

    Started by Giacomo‎, 10-12-2009 04:47 PM
    • Replies: 2
    • Views: 6,680
    10-13-2009, 11:30 AM Go to last post
  6. Unhappy probability of alleles (?)

    Each of us has an ABO blood type, which describes whether two characteristics called A and B are present. Every human being has two blood type...

    Started by dumbcollegestudent‎, 10-12-2009 10:59 AM
    • Replies: 2
    • Views: 6,549
    10-12-2009, 01:59 PM Go to last post
  7. probability problem

    Hi, i'm currently taking intro stats in college and I'm having trouble with probability questions. Here's one of the questions I'm working on: ...

    Started by dumbcollegestudent‎, 10-11-2009 10:39 PM
    • Replies: 4
    • Views: 2,401
    10-12-2009, 10:56 AM Go to last post
  8. another problem :(

    Below are the distributions of blood types in the US and China: Blood type A B AB O US probability .1 .2 .3 .4 China prob. .2 .2 .2 .4 Choose an...

    Started by dumbcollegestudent‎, 10-11-2009 11:12 PM
    • Replies: 1
    • Views: 1,987
    10-12-2009, 03:55 AM Go to last post
  9. Joint probability distribution

    1. An instructor has given a short test consisting of two parts. For a randomly selected student, let X = the number of points earned on the rst part...

    Started by boydale1‎, 10-11-2009 05:05 PM
    • Replies: 1
    • Views: 10,835
    10-11-2009, 07:28 PM Go to last post
  10. Two Random Variables

    Hi, I got a very easy multiple question, I think that the correct answer is missing, please verify... Two independent random variables are...

    Started by WeeG‎, 10-11-2009 02:56 AM
    • Replies: 1
    • Views: 2,690
    10-11-2009, 10:30 AM Go to last post
  11. Determinant of the variance-covariance matrix

    Let ∑ be the variance-covariance matrix of a random vector X. The first component of X is X1, and the second component of X is X2. Then det(∑)=0...

    Started by kingwinner‎, 10-10-2009 06:15 PM
    • Replies: 0
    • Views: 4,407
    10-10-2009, 06:15 PM Go to last post
  12. 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: 17,458
    10-10-2009, 06:03 PM Go to last post
  13. simple probability question

    Hello, I need a confirmation to the answer of this question please: It is known that the value of stock A increase in 50% of the days, and...

    Started by WeeG‎, 10-10-2009 04:57 AM
    • Replies: 1
    • Views: 3,499
    10-10-2009, 12:03 PM Go to last post
  14. Using MLE's to create a Markov transition matrix

    Hello, I was wondering if anyone knew how I could create a transition matrix for a Markov chain from a dataset. 2 examples of such data are...

    Started by woody198403‎, 10-09-2009 09:26 PM
    • Replies: 0
    • Views: 3,853
    10-09-2009, 09:26 PM Go to last post
  15. Necessary to check normality of definitively non-normal data sets?

    hi, i'm working with data sets that are not normally distrubuted, and do not respond with normality to transformations (log, sqrt, z-score). they...

    Started by as123‎, 10-08-2009 12:33 PM
    • Replies: 0
    • Views: 2,336
    10-08-2009, 12:33 PM Go to last post
  16. About negative probability

    I found there is a term of "negative probability" in WikiPedia. Here is the link: http://en.wikipedia.org/wiki/Negative_probability I would...

    Started by LigongKarlChen‎, 09-18-2009 09:17 AM
    • Replies: 1
    • Views: 2,277
    10-07-2009, 06:49 PM Go to last post
  17. probability problem

    Hi have two probability question I am really struggling to get my head around,would really appreciate some guidance. 1.Drilling of a 100m long...

    Started by mitchj04‎, 10-01-2009 11:18 PM
    • Replies: 1
    • Views: 2,579
    10-07-2009, 06:14 PM Go to last post
  18. Unhappy Binomial Probability Distributions

    I am having alot of difficulty in my bio-statistics class can anyone help with these 2 questions? Create pmf and histogram before answering these...

    Started by ktladyk25‎, 10-06-2009 12:25 PM
    • Replies: 1
    • Views: 4,706
    10-06-2009, 01:08 PM Go to last post
  19. Multinomial Distribution Question

    Demonstrate that the multinomial probability mass function sums to 1 for all possible values of y. Demonstrate that the expected value of Y_i =...

    Started by Giacomo‎, 10-05-2009 03:02 PM
    • Replies: 1
    • Views: 5,028
    10-06-2009, 02:29 AM Go to last post
  20. Density function?

    Please can you help me solve this the pdf of continues r.v. X where f(x) {(2x 0≤x≤1 0 elsewhere} 1)...

    Started by zulkfal_1981‎, 10-04-2009 06:49 PM
    • Replies: 4
    • Views: 3,188
    10-05-2009, 04:09 PM Go to last post
  21. Joint density

    Am a software engineer, and not know much about statsitics but have to explain my younger brother, please help me with this, thanks X1 and X2 have...

    Started by zulkfal_1981‎, 10-04-2009 07:55 PM
    • Replies: 2
    • Views: 3,674
    10-05-2009, 02:59 AM Go to last post
  22. Exclamation Simple Probability Question... That I Don't Understand

    I am attempting to do some online homework but I'm stuck on the very first question. The first bit wasn't too hard to figure out (I merely multiplied...

    Started by teris‎, 10-04-2009 07:33 PM
    • Replies: 4
    • Views: 7,028
    10-04-2009, 08:48 PM Go to last post
  23. Biased Coin and Conditional Probability

    Here's another question that I'm trying to work the kinks out of. Consider a biased coin with the probability of getting heads being p. The coin...

    Started by tom86‎, 10-04-2009 05:15 PM
    • Replies: 1
    • Views: 8,569
    10-04-2009, 06:53 PM Go to last post
  24. Exclamation Plz help on this question?

    My younger brother asked me and am stuck? Question: Find the probability that exactly four observations of a random sample of size 5 from the...

    Started by zulkfal‎, 10-04-2009 02:37 AM
    • Replies: 1
    • Views: 2,119
    10-04-2009, 04:37 AM Go to last post
  25. Permutations and Combinations Help

    I've had some trouble with a recent assignment involving combinations and permutations. I've found this to be my weakest area in my statistics...

    Started by tom86‎, 10-02-2009 09:22 PM
    • Replies: 2
    • Views: 3,355
    10-02-2009, 11:02 PM Go to last post
  26. Question prof said wrong but..about the normal probability distribution help!

    i read these on the internet but prof said wrong ..can anyone explain me ? 1- It is symmetric about the mean. 2- The total area under the...

    Started by selimcan‎, 10-02-2009 10:08 PM
    • Replies: 1
    • Views: 2,087
    10-02-2009, 10:53 PM Go to last post
  27. Wink is that true?

    A process may be out of control even if all the points on the x-bar control chart lie between the UCL and LCL. i that true ? what r u think...

    Started by selimcan‎, 10-02-2009 02:33 AM
    • Replies: 1
    • Views: 3,185
    10-02-2009, 10:23 AM Go to last post
  28. Thumbs down i calculated 22 but i am not sure

    This is practice question given by my face to face course assistant... You are in charge of a laboratory which produces high quality, high...

    Started by selimcan‎, 10-02-2009 02:03 AM
    • Replies: 0
    • Views: 1,812
    10-02-2009, 02:03 AM Go to last post
  29. hello

    i am study in England. Sometimes i have terrible in statistic.. I have some question.I can say its not my homework..Just for practise just in case:)...

    Started by selimcan‎, 10-02-2009 01:57 AM
    • Replies: 0
    • Views: 1,458
    10-02-2009, 01:57 AM Go to last post
  30. Normal Probability Plot

    Hi, I would be obliged if someone would assist me interpting the attached normal probability plot. To me it shows that the data DeltaBeta seems...

    Started by PeterVincent‎, 10-01-2009 12:24 PM
    • Replies: 0
    • Views: 2,567
    10-01-2009, 12:24 PM Go to last post
  31. Basic probability

    Lets say that I have a population of 2^24 individuals. Each individual, including myself and friends has assigned an individual number. One of them...

    Started by jninguem‎, 10-01-2009 03:42 AM
    • Replies: 0
    • Views: 1,949
    10-01-2009, 03:42 AM Go to last post
  32. Question Finding mean E[X] using permutations, combinations??

    A permutation of the numbers 1, ... 12 is drawn at random, and written on a sheet of paper. For example, 9, 2; 5, 1, 8, 12, 10, 3, 6, 11, 4, 7....

    Started by Intsecxtanx‎, 09-29-2009 08:54 PM
    • Replies: 1
    • Views: 3,075
    09-29-2009, 10:13 PM Go to last post
  33. Question Determining a prob mass function? E[X] and Var[X] help please?

    There are 10 chips in a bag: 4 have the number 1 written on them, 2 the number 2, and 4 the number 3. Suppose each chip is drawn with the same...

    Started by Intsecxtanx‎, 09-29-2009 08:49 PM
    • Replies: 1
    • Views: 2,849
    09-29-2009, 10:03 PM Go to last post
  34. probability question...

    A study revealed that 8% of all ENT bacteria isolated in hospitals nationwide were resistant to vancomycin antibiotic. Consider a random sample of 3...

    Started by e0523‎, 09-29-2009 01:57 PM
    • Replies: 1
    • Views: 2,549
    09-29-2009, 03:48 PM Go to last post
  35. Binary Bootstrap

    Is it valid to use a bootstrap technique for estimating variance in a binary (yes/no or 1/0) data set? My motivation for doing so is to perform...

    Started by cmonke‎, 08-15-2009 02:57 PM
    • Replies: 5
    • Views: 7,411
    09-29-2009, 04:01 AM Go to last post
  36. Question trouble...

    Working on this for a class and wondering if I did this correctly. If anyone could help that would be great. Thanks in advance! 60% of the...

    Started by aqulopez44‎, 09-28-2009 05:00 PM
    • Replies: 2
    • Views: 2,431
    09-28-2009, 10:50 PM Go to last post
  37. conditional expected value #2

    I have two possibilities; X1 and X2. I set up a table: X2: 2: 0: -2 : X1: 0 : 0.1 0.2 0.1 -2: 0.0 0.3 0.3 Then I found: Px1(0)...

    Started by mandarine‎, 09-26-2009 05:54 AM
    • Replies: 4
    • Views: 2,974
    09-27-2009, 10:57 AM Go to last post
  38. Help, suspiciously common birthdate

    I have a database with 41469 medical practice patients. The patients have 22499 different (unique) dates of birth. Sorting by occurrence produces...

    Started by CharlesIsw‎, 09-21-2009 05:34 PM
    • Replies: 4
    • Views: 2,568
    09-27-2009, 02:23 AM Go to last post
  39. Probability in the Design of Social Games

    Hey all, I have a math major and in my free time I design online social games. Frequently in these games, players are divided into groups and often I...

    Started by SirSam972‎, 09-22-2009 12:01 AM
    • Replies: 4
    • Views: 3,123
    09-27-2009, 01:04 AM Go to last post
  40. probability problem

    I have a probability problem that is confusing me i think over a fine point taht i'm not getting. Here is the problem: a pizza with 8 slices,...

    Started by Stats Guy‎, 09-26-2009 02:45 PM
    • Replies: 4
    • Views: 2,349
    09-27-2009, 12:47 AM Go to last post
  41. stuck on a probability problem

    THe question is according to the January theory if the stock market is up in Jan. it will be up all year, if its down it will be down all year....

    Started by bjfro‎, 09-26-2009 05:46 PM
    • Replies: 0
    • Views: 2,442
    09-26-2009, 05:46 PM Go to last post
  42. Conditional expected value

    I have two possibilities; X1 and X2. The question is: If you know that X1 gives you 0 then what does X2 give you? I set up a table: X2: 2 0 ...

    Started by mandarine‎, 09-25-2009 02:26 PM
    • Replies: 3
    • Views: 2,495
    09-26-2009, 05:58 AM Go to last post
  43. Help!

    At a particular location a postal worker clears a letterbox each day. He kept a week’s record of the number of letters cleared. The data are as...

    Started by Pearl Azula‎, 09-24-2009 08:05 PM
    • Replies: 1
    • Views: 1,866
    09-24-2009, 10:02 PM Go to last post
  44. Normal Distribution and Z-Score Help

    I am working on a problem and I am having problems with the z-score I calculate. The problem is: A baseball player's average distance is 180...

    Started by Jnak‎, 09-21-2009 02:42 PM
    • Replies: 4
    • Views: 4,032
    09-22-2009, 02:26 PM Go to last post
  45. Probability problem - some help please

    The problem reads: Venture capital gave a boost to available funds to companies in the past recent years. According to economic stats, 2,000...

    Started by elementarystat‎, 09-21-2009 08:58 AM
    • Replies: 1
    • Views: 2,075
    09-21-2009, 11:28 AM Go to last post
  46. Please help me

    A game is played with 2 fair dice. You roll the 1st die and note its score. You will then roll the 2nd die. The game ends if the score on this die is...

    Started by i_like_maths‎, 09-21-2009 05:02 AM
    • Replies: 3
    • Views: 1,863
    09-21-2009, 06:56 AM Go to last post
  47. Birthday Problem

    Can anyone help me with these questions? I am new in probability and i even don't know where to start..:( (1)What is the minimum number of people...

    Started by sanjitpatel2004‎, 09-19-2009 10:46 AM
    • Replies: 5
    • Views: 3,779
    09-20-2009, 04:57 PM Go to last post
  48. I'm a pure mathematician. HELP!

    Hi, As the title says I'm a pure mathematician. Sorry for the non specific title of the thread, I don't know what the following problem should be...

    Started by gccd‎, 09-10-2009 06:45 PM
    • Replies: 11
    • Views: 3,777
    09-18-2009, 12:30 PM Go to last post
  49. Conditional Probability

    nvm figured it out!!! sorry!!

    Started by sykohawk‎, 09-18-2009 03:20 AM
    • Replies: 0
    • Views: 1,755
    09-18-2009, 03:20 AM Go to last post
  50. What is the probability for this case?

    Please help me to understand the following statement that I got it in a research on the piecewise regression analysis. Since I am a medical doctor...

    Started by LigongKarlChen‎, 09-15-2009 04:10 PM
    • Replies: 3
    • Views: 3,804
    09-17-2009, 10:36 PM Go to last post
  51. help with contingency table

    hi all, i was looking for a little help with a contigency table. the problem states, according to a nutrition table, four products have 35%, 25%,...

    Started by skrib09‎, 09-16-2009 03:41 PM
    • Replies: 0
    • Views: 2,667
    09-16-2009, 03:41 PM Go to last post
  52. Mainly interested in knowing if a solution is even possible.

    P(A U B) = .7 P(A U compliment of B) = .9 Find P(A) I've racked my brain and cannot come up with an answer. This is all I've...

    Started by bartoncl‎, 09-15-2009 01:48 PM
    • Replies: 1
    • Views: 2,162
    09-16-2009, 09:01 AM Go to last post
  53. Lottery Probabilities

    I'm no statistician but hope for some help from the experts. The UK national lottery has been drawn roughly 1500 times since 1994. The frequencies...

    Started by cgc‎, 09-12-2009 06:16 PM
    • Replies: 2
    • Views: 2,985
    09-15-2009, 09:08 PM Go to last post
  54. "with and without replacement" question

    hi, thanks for taking a look. im stumbling on trying to understand one question. the problem is: a box of nine gloves contains two left handed...

    Started by skrib09‎, 09-10-2009 02:26 PM
    • Replies: 1
    • Views: 5,683
    09-15-2009, 12:39 PM Go to last post
  55. probability of payouts

    Hi and thanks for looking at this. We have a client who is donating 10% of pet ecommerce profits to shelters. We are building an online slot...

    Started by darbo‎, 09-15-2009 11:13 AM
    • Replies: 0
    • Views: 2,238
    09-15-2009, 11:13 AM Go to last post
  56. Unhappy Urgent Markov Help - Stationary Distributions

    I have a mid-term in about 18 hours and I really need to know fast how to do this question. I have a 1-step transition matrix (see attached image)...

    Started by woody198403‎, 09-14-2009 10:00 AM
    • Replies: 0
    • Views: 2,451
    09-14-2009, 10:00 AM Go to last post
  57. Discrete and Random Variables

    I'm not sure how to setup this problem. It says: To perform certain type of blood analysis, lab technicians must perform two procedures. The...

    Started by elementarystat‎, 09-14-2009 08:06 AM
    • Replies: 1
    • Views: 9,758
    09-14-2009, 08:30 AM Go to last post
  58. Post Probability Homework

    I have a probability question that I have no idea where to start. It is probably simple but I don't have any idea where to start. I was thinking it...

    Started by cjb‎, 09-13-2009 10:52 PM
    • Replies: 0
    • Views: 2,812
    09-13-2009, 10:52 PM Go to last post
  59. Probability question. Need help!

    Suppose I have faith in my local weather reporter who says that the chance of rain tomorrow is 80 percent. Moreover, my friend, the seasoned sailor,...

    Started by elray8908‎, 09-13-2009 04:49 PM
    • Replies: 0
    • Views: 2,201
    09-13-2009, 04:49 PM Go to last post
  60. Mathematical Probability with respect to Frequencies

    I am trying to figure out what the chances are of a run of 13 blacks in a row happening over the course of 80,000 spins of a roulette wheel. I am...

    Started by jjbarde‎, 09-11-2009 11:59 PM
    • Replies: 1
    • Views: 2,232
    09-13-2009, 10:03 AM Go to last post

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