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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: 30,374
    09-30-2005, 09:44 AM Go to last post
  1. Question calculating frequency of ingredients in various cookbooks?

    Hi Everybody I just need a push in the correct direction of which statistics formula I should use and how? I am given x number (unknown) of...

    Started by dontrigg‎, 06-25-2006 11:41 AM
    • Replies: 3
    • Views: 2,431
    07-19-2006, 09:14 AM Go to last post
  2. Calculating Hazard Ratios

    Hi there, I would like to calculate the hazard ratio (or deviation from the mean) for an 'event' My data has the dates of 'events' and I would...

    Started by MrT‎, 08-28-2013 01:48 AM
    • Replies: 4
    • Views: 8,126
    08-28-2013, 09:12 AM Go to last post
  3. Question Calculating Joint Probability

    If I have uniform random variables X and Y in the range (a,b), how can I calculate joint probability distribution function p(y,x) for y...

    Started by smohantycs‎, 08-17-2010 10:18 PM
    • Replies: 4
    • Views: 8,741
    08-19-2010, 02:11 PM Go to last post
  4. Calculating moment generation function: Set up correctly, need help with integral!

    Hi, I’ve reached a dead end in calculating this moment generating function. f(x) = 2e^{2-2x}, x > 1 ...

    Started by S-C-3-1-3‎, 12-05-2012 11:05 PM
    • Replies: 1
    • Views: 1,471
    12-05-2012, 11:16 PM Go to last post
  5. Calculating number of individuals from probability

    Hello everyone, I am a little new to statistics - so sorry if this sounds very basic to most of you - but I have been scratching my head over this...

    Started by Neodyme‎, 07-03-2013 10:26 PM
    independent events, minimum maximum number, probability
    • Replies: 4
    • Views: 1,397
    07-04-2013, 09:00 PM Go to last post
  6. Calculating observed probability

    Can anyone point me towards the formula and extra reading I would need to calculate how many observations I would need to make in order to calculate...

    Started by ThomasCNot‎, 06-10-2015 08:41 AM
    confidence interval, observed probability
    • Replies: 3
    • Views: 2,861
    06-12-2015, 06:15 AM Go to last post
  7. Calculating Probabilities

    If a mechanical fault in a car occurs once in every 120 days, and I drive the car 260 days per year, what is the probability of a mechanical fault...

    Started by Rab1‎, 07-09-2016 06:23 AM
    • Replies: 5
    • Views: 1,130
    07-20-2016, 12:59 PM Go to last post
  8. Calculating probability given mean and standard deviation

    Hi I have looked around for this post on the forum but could not find one and have spent a while attempting this question: Given that X is...

    Started by omf52‎, 10-28-2012 09:43 AM
    normal, p-value, standard deviation
    • Replies: 0
    • Views: 5,492
    10-28-2012, 09:43 AM Go to last post
  9. Calculating probability of a given student major

    First off, this is a homework question. I am completely stuck on this problem and am not sure how to answer the question. We are given a table of...

    Started by hackman2007‎, 02-19-2009 08:23 PM
    • Replies: 5
    • Views: 3,291
    02-21-2009, 09:12 PM Go to last post
  10. Calculating probability of at least/exactly X when rolling 2 n-sided dice

    Hi, Psychology student struggling with probabilities here. Can anyone please tell me how do I calculate: 1) The probability of getting at...

    Started by replica‎, 11-12-2014 07:30 PM
    • Replies: 0
    • Views: 1,186
    11-12-2014, 07:30 PM Go to last post
  11. Calculating Probability of Cyber Attack Data

    Folks, need some help, maybe this question is incomplete and needs more data but let me know if thats the case as well: I have a tool that...

    Started by jhingi‎, 02-17-2012 08:42 PM
    • Replies: 0
    • Views: 4,381
    02-17-2012, 08:42 PM Go to last post
  12. Calculating Probability of Failure

    I am a solicitor with an engineering background. I have a client who needs to work out what the probability is that a customer will be injured by a...

    Started by alexmay‎, 01-31-2013 06:46 AM
    • Replies: 6
    • Views: 2,954
    01-31-2013, 02:32 PM Go to last post
  13. Calculating probability of multiple events

    This is my first post so I hope I can get my question across reasonably intelligently. I have calculated the probability of an event occurring for...

    Started by Bear47‎, 11-18-2008 10:12 AM
    • Replies: 3
    • Views: 13,456
    11-26-2008, 05:24 AM Go to last post
  14. Calculating probability of the expected number of runs needed

    Hello, I'm working on a personal project but I've hit a bit of a wall in working out an equation. I'd like to find the probability of a result given...

    Started by Zackley‎, 09-28-2015 01:03 AM
    • Replies: 6
    • Views: 1,846
    09-28-2015, 02:25 PM Go to last post
  15. Calculating probability that a business will find a buyer and sell

    Bare with me whilst I try and explain this one. I work for a business that finds companies to buy a client business that's signed up with us. I have...

    Started by sallwright‎, 10-23-2013 02:56 AM
    business, economics, multi-variable, probability
    • Replies: 0
    • Views: 1,111
    10-23-2013, 02:56 AM Go to last post
  16. Calculating probability to construct a random variable probability function

    Hello all, I have this question and I struggle to understand what to do. "There are 2 groups of numbers: A: 2,2,3,3 and B: 5,5,6 A number is...

    Started by Yankel‎, 12-28-2016 03:51 AM
    • Replies: 2
    • Views: 2,811
    12-28-2016, 08:40 AM Go to last post
  17. Question Calculating Random Numbers with a Negative Correlation (Monte Carlo)

    I'm trying to create a set of random, lognormal distributed, negatively correlated numbers from several P90, P50 and P10 inputs. Creating sets of...

    Started by Geezer‎, 03-19-2013 03:52 AM
    • Replies: 1
    • Views: 2,658
    03-19-2013, 08:19 AM Go to last post
  18. Question Calculating Sensitivity and Specificity of Combined Testing...With a Surprise.

    Ok guys. I have an interesting question. I'm a biomedical engineering student from Georgia Tech and for one of my classes I have to implement...

    Started by ErikSampayo‎, 01-27-2015 01:49 PM
    conditional testing, rescreening, screening, sensitivity, specificity
    • Replies: 5
    • Views: 1,559
    02-03-2015, 09:35 AM Go to last post
  19. Calculating special lottery odds

    #s out of a bag! Hello, I would appreciate anyone's help in this problem: There are 11 balls in a bag numbered 0-10. You get 6 picks out of...

    Started by Copperfil‎, 11-16-2015 09:49 PM
    #lottery, #odds, #probability
    • Replies: 4
    • Views: 1,327
    11-24-2015, 12:54 AM Go to last post
  20. calculating stddev from ci - gamma dist

    Hi all, I'm trying to figure out the standard deviation of a gamma distribution armed only with the mean and 90% confidence interval (1.86 for...

    Started by jefflovejapan‎, 09-05-2010 09:14 PM
    • Replies: 9
    • Views: 4,222
    09-07-2010, 04:18 AM Go to last post
  21. Calculating the expected value

    Hi, I have a strange problem. Following info is provided: Event insurance comp. allows promoters of any event to protect themselves from financial...

    Started by Ayyappa‎, 05-26-2010 01:28 PM
    • Replies: 1
    • Views: 3,495
    05-26-2010, 01:57 PM Go to last post
  22. Talking Calculating the Odds of Winning

    I'm trying to calculate the odds of winning a promitional event. The game is as follows: There will be 50 envelopes each with a poker card in it....

    Started by NinerLoyal‎, 04-15-2009 10:47 AM
    • Replies: 0
    • Views: 2,301
    04-15-2009, 10:47 AM Go to last post
  23. Calculating the Probability of a Subset

    I'm a newbie and not a stats savvy so help and guidance is appreciated. If I use incorrect terms please forgive and correct. The data set...

    Started by dofdear‎, 09-25-2015 12:55 PM
    probability
    • Replies: 7
    • Views: 1,876
    09-27-2015, 01:38 AM Go to last post
  24. Calculating the probability of finding pairs of n-letter substrings in DNA

    Hi, I've been struggling a bit with this problem: If I have a sequence of DNA made from letters ATGC which has a length of say 3571 letters,...

    Started by James1984‎, 12-21-2016 07:58 PM
    • Replies: 0
    • Views: 2,630
    12-21-2016, 07:58 PM Go to last post
  25. Calculating two-tailed probability for Monte Carlo sampling distribution

    Hi, First off, I am new to this forum and would like to take this chance to say hi to everyone. I am currently working on a statistics project,...

    Started by samlin‎, 06-04-2014 02:43 PM
    • Replies: 0
    • Views: 1,241
    06-04-2014, 02:43 PM Go to last post
  26. Unhappy Calculating z value/mean and standard deviation

    Hi...have completed my assignment (and have come a long way with some helpful tips on this forum) but am stuck on one problem: In grading apples...

    Started by ShannonL‎, 11-05-2005 11:25 PM
    • Replies: 11
    • Views: 42,712
    01-07-2006, 10:22 PM Go to last post
  27. calculation of a probability

    Hi there, I have the following problem: Suppose that: X~Exp(3) Y=bernoulli(p), where p=exp(x)/(1+exp(x)). What is P(Y=1|X>2)=??? (or...

    Started by leo nidas‎, 08-31-2008 01:47 PM
    • Replies: 2
    • Views: 2,511
    09-01-2008, 02:41 AM Go to last post
  28. calculation of distance using Kullback–Leibler divergence

    Hi, Basically I'm from biology back ground. So it may be a basic question for you. I have two plots for example plot1: X - axis values: ...

    Started by asd123‎, 03-03-2011 05:39 AM
    • Replies: 2
    • Views: 121,618
    03-03-2011, 09:39 AM Go to last post
  29. Calculation of Frequency

    Hi, I am trying to calculate the probability of randomly picking a card (A through 2) from a standard deck of 52 + 1 joker if 5 cards are dealt. ...

    Started by DCtheplace2b‎, 07-16-2009 04:04 PM
    • Replies: 0
    • Views: 1,772
    07-16-2009, 04:04 PM Go to last post
  30. Calculatng an event

    Find the probability that contains the event A but not event B. P(A) = 0.15, P(B) = 0.05, P(A or B) = 0.17 I thought I could use P(A or B) - P(B)...

    Started by SmileAli‎, 04-02-2010 04:49 PM
    • Replies: 1
    • Views: 2,358
    04-05-2010, 03:40 AM Go to last post
  31. Calutate probability of failure count is greater then a value over a specified period

    Hi everyone, I wonderded wicht formula i can use tot caluclate the probability of a system with x components to fail (this occurs when he system has...

    Started by mrcannibal‎, 06-11-2011 03:26 AM
    • Replies: 1
    • Views: 2,338
    06-11-2011, 03:50 AM Go to last post
  32. Came across a very difficult problem...

    I really thought hard over this problem for about a hour or two. Here's the problem: A coin has P(head) = p. Keep tossing until you finish a run...

    Started by vxs8122‎, 09-07-2013 11:59 PM
    • Replies: 4
    • Views: 1,814
    09-12-2013, 02:06 PM Go to last post
  33. Can anybody correct me please?!!

    Here is a question that I came across and I answered it, but I’m not sure about it. Three drugs are selected at random, and each is categorized as...

    Started by yoha‎, 02-26-2012 08:21 PM
    • Replies: 0
    • Views: 1,352
    02-26-2012, 08:21 PM Go to last post
  34. Can anybody help me with this probability question?

    helpneeeded

    Started by sahilkthr‎, 11-05-2008 03:42 PM
    • Replies: 4
    • Views: 2,314
    11-06-2008, 02:24 AM Go to last post
  35. Can anybody help please!!

    I'm studying probabilities and I came across the following problem. It's actually answered in the book but I couldn't really figure it out. ...

    Started by yoha‎, 02-25-2012 07:28 PM
    • Replies: 0
    • Views: 1,775
    02-25-2012, 07:28 PM Go to last post
  36. Can anyone explain me the solution of this exercise please?

    Hi i've found this exercise but I do not understand the solution: _________________________________________________________________ In a party c...

    Started by alfred_oh‎, 04-30-2013 04:15 AM
    • Replies: 2
    • Views: 1,576
    04-30-2013, 05:52 AM Go to last post
  37. Can anyone help me with this exercise?

    Hi! I have to do this exercise: Define a finite probabilistic Space (Ω; Pr) and 2 events A,B⊆ Ω and Pr ≠ Pr so that we can verify that ...

    Started by alfred_oh‎, 04-30-2013 06:53 AM
    • Replies: 1
    • Views: 1,907
    04-30-2013, 09:10 AM Go to last post
  38. can anyone help on this one?

    Given two i.i.d uniform random points x and y on the interval , what is the average size of the smallest of the three resulting intervals?

    Started by tennis89‎, 09-10-2010 07:00 PM
    • Replies: 4
    • Views: 2,462
    09-11-2010, 10:04 AM Go to last post
  39. Can ANYONE solve this??????

    I am trying to figure out the method I should use to find the probability of picking any rank of cards (Ace through Deuce) from a standard deck of 52...

    Started by DCtheplace2b‎, 07-18-2009 12:14 PM
    • Replies: 5
    • Views: 3,074
    07-20-2009, 01:15 PM Go to last post
  40. Can I calculate a p-value here?

    Hey everyone! Ok so I ran a biochemistry experiment the other day and I wanted to calculate a p-value for my data. The experiment is pretty...

    Started by chemnerd1‎, 04-02-2009 03:19 AM
    • Replies: 2
    • Views: 7,422
    04-02-2009, 04:47 PM Go to last post
  41. Can I Know The Difference and A Couple of Questions

    Mean 266 Days STD=16 Days Question 1- What is the probability that a random sample of 20 pregnancies that has a mean gestation period of 260...

    Started by PSG‎, 03-29-2013 03:41 PM
    • Replies: 2
    • Views: 1,760
    03-30-2013, 12:00 AM Go to last post
  42. Can increased promiscuity decrease STD risk? Part I.

    My brother mentioned a book he had read and enjoyed. In it, a chapter was devoted to the idea that "More 'Secks' is Safer 'Secks'". An abridged...

    Started by gobirthright‎, 07-04-2008 01:04 PM
    • Replies: 0
    • Views: 2,859
    07-04-2008, 01:04 PM Go to last post
  43. Can probability limit be used as mean for asymptotic distribution?

    Hi there, I was wondering the following. If I have found that a variable X converges to some probability limit p and subsequently I wish to find...

    Started by Mkkl‎, 09-27-2015 11:00 AM
    asymptotic variance, plim
    • Replies: 1
    • Views: 1,752
    09-27-2015, 12:59 PM Go to last post
  44. Can some one please solve part b and c of this probability question

    Can some one please solve part b and c of this probability question?? Thanks The Myers Briggs type indicator has been used to measure...

    Started by srksaloo‎, 10-18-2012 11:47 AM
    • Replies: 3
    • Views: 1,614
    10-18-2012, 12:00 PM Go to last post
  45. Can some one solve this as soon as possible ?!

    Started by Ahmedelwakeel‎, 12-15-2012 07:35 PM
    • Replies: 1
    • Views: 1,609
    12-15-2012, 07:41 PM Go to last post
  46. Can somebody help me look this over to verify if it is correct?

    I have this project I am working on. I want to make sure it is correct. My professor helped me with part of it in the middle, and I had difficulty...

    Started by bershe‎, 12-05-2014 08:09 AM
    • Replies: 0
    • Views: 1,339
    12-05-2014, 08:09 AM Go to last post
  47. Can somebody please explain this solution to me?

    Hi there: I am preparing for an upcoming exam and have many practice problems I am going through. I have a hard time following the solution of the...

    Started by soriold‎, 10-07-2007 10:55 AM
    • Replies: 0
    • Views: 2,391
    10-07-2007, 10:55 AM Go to last post
  48. Can someone check if I did this right?

    word problem: eight married couples are studying in a room. If four people are chosen at random, find the probability that: a) they are married...

    Started by shell‎, 07-08-2011 07:11 PM
    • Replies: 1
    • Views: 2,249
    07-08-2011, 08:31 PM Go to last post
  49. can someone check this work pls

    Question Is there any relationship between a person’s sex and how frequently that person reads the sports section of a local news paper? A...

    Started by sweetx‎, 12-14-2006 01:59 PM
    • Replies: 2
    • Views: 2,399
    12-16-2006, 04:15 AM Go to last post
  50. Can someone confirm if i calculated this properly

    In a jar we have: 2 Big White Balls 4 Small White Balls 2 Big Black Balls 2 Small Black Balls Blindfolded we pick 2 balls out the jar.....

    Started by nered‎, 07-02-2011 02:44 PM
    • Replies: 4
    • Views: 2,169
    07-02-2011, 10:56 PM Go to last post
  51. Can someone explain how to solve this simple problem?

    Your favorite team is in the World Series. You have assigned a probability of 63% that they will win the championship. Past records indicate that...

    Started by ekkakub‎, 10-26-2011 07:39 PM
    • Replies: 5
    • Views: 6,247
    10-26-2011, 09:10 PM Go to last post
  52. can someone solve this ?!

    find values of a b and c

    Started by Ahmedelwakeel‎, 12-22-2012 05:31 PM
    • Replies: 2
    • Views: 1,763
    12-22-2012, 10:49 PM Go to last post
  53. Can someone tell me the why?

    I'm trying to figure out this self-check exercise but don't see why it multiplies by 2 to the 5th or 32. Can someone help?

    Started by ChadP‎, 06-26-2007 04:32 AM
    • Replies: 1
    • Views: 2,126
    07-03-2007, 12:58 PM Go to last post
  54. Can you check my answers please?

    Hi, Can you please check my answers? Thanks 1) In examining borrower characteristics versus loan delinquency, a bank has collected the following...

    Started by SadieKhan‎, 01-09-2011 06:27 AM
    • Replies: 0
    • Views: 4,396
    01-09-2011, 06:27 AM Go to last post
  55. Can you figure this out?

    My company has a Safety Bingo game. For every day there is no accident in the plant, we pull a number. Every associate has a card and there are 110...

    Started by buck‎, 08-23-2006 02:36 PM
    • Replies: 2
    • Views: 3,353
    08-30-2006, 09:25 AM Go to last post
  56. 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: 5,786
    11-09-2006, 07:39 AM Go to last post
  57. can you get probability simply from a percentage?

    I have this problem I'm trying to figure out regarding discrete probability distributions. If I have a percentage of either successful or failed...

    Started by Joia‎, 02-14-2009 05:35 PM
    • Replies: 5
    • Views: 4,413
    02-14-2009, 10:50 PM Go to last post
  58. can you help with this as well!?

    Suppose that 20% of all subscribers to a business magazine earn an income greater than $100,000. If the magazine takes a random sample of 20...

    Started by statsdud‎, 11-02-2005 05:01 PM
    • Replies: 4
    • Views: 3,243
    11-03-2005, 03:15 PM Go to last post
  59. Lightbulb Can you really solve for an MLE given a fictitious distributi

    to estimate MLE, you need more than one observation, right? What if you don't have a density function? (It's a fictitious disitrubtion)

    Started by idejstark‎, 03-25-2010 09:01 PM
    • Replies: 3
    • Views: 2,487
    04-09-2010, 09:09 AM Go to last post
  60. Can't answer C & D

    Hi, Had a problem on the test where I answered A & B correctly but C & D I did not understand. A company finds that an average of 25% of all...

    Started by logika‎, 06-19-2011 03:33 PM
    • Replies: 1
    • Views: 2,198
    06-19-2011, 03:37 PM Go to last post

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