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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: 30,315
    09-30-2005, 09:44 AM Go to last post
  1. standard deviations in scatter plots

    I am working with data that involves blood volumes in the heart according to gestation. I have plotted these values using a twoway scatter graph. I...

    Started by jeantrines‎, 10-22-2010 12:35 PM
    • Replies: 1
    • Views: 6,680
    10-22-2010, 01:16 PM Go to last post
  2. Question Probability of a string containing a specific substring

    So I've been getting into concepts like the Library of Babel and infinite monkey theorem, and have been trying to work out how to calculate the...

    Started by Chris Morrow‎, 10-14-2011 07:39 PM
    infinite monkeys, library of babel, recursive functions, substrings
    • Replies: 1
    • Views: 6,679
    01-18-2012, 11:22 AM Go to last post
  3. 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: 6,663
    10-13-2009, 11:30 AM Go to last post
  4. factorial.. with replacement?

    Here is the problem.. (literally..) In your stats class, the teacher has three drawing for prizes (a, b , c). There are 15 students in class ...

    Started by masspt‎, 02-28-2006 11:07 PM
    • Replies: 2
    • Views: 6,660
    03-01-2006, 07:35 AM Go to last post
  5. Question about exponential distribution

    Okay, because P(Y) is an exponential function with mean of 10, I know a=1, B=10 P(Y) = (1/B)e^(-y/B), or (1/10)e^(-y/10). I'm stuck with what to do...

    Started by APOCooter‎, 11-15-2011 03:40 PM
    • Replies: 3
    • Views: 6,641
    11-16-2011, 12:00 AM Go to last post
  6. unfair coin problem

    im stuck with a part of a problem which is : An unfair coin (p{h}=p=0.6) is tossed n=20 times. FIND the probability that the number of heads k is...

    Started by sajee3a‎, 09-13-2010 03:41 PM
    • Replies: 8
    • Views: 6,640
    09-14-2010, 01:46 AM Go to last post
  7. real estate probability

    A real estate agent is showing homes to a prospective buyer. There are 12 homes in the desired price range listed in the area. The buyer has time...

    Started by psu2007‎, 07-10-2009 01:28 PM
    • Replies: 1
    • Views: 6,624
    07-11-2009, 08:03 AM Go to last post
  8. Smile The auto-correlation of poissonian point process

    I saw in a paper that the autocorrelation function of a poissonian point process is the following, R(t)=v^2+v*delta(t), written in Matlab style. The...

    Started by humenghu‎, 04-21-2012 10:41 AM
    • Replies: 2
    • Views: 6,620
    04-29-2014, 02:00 PM Go to last post
  9. Cool Distribution of Sum of Independent Random Variables Having Chi-square Distributions

    Hey... Ive been asked to Prove or show that one of the properties of the Chi-square distribution is true and I have no idea how to even get started....

    Started by StatisticallySignificant‎, 02-03-2009 10:31 PM
    • Replies: 1
    • Views: 6,610
    02-04-2009, 09:13 PM Go to last post
  10. Transformation of Y = 1/X

    X ~ U(2,4). Find the density of Y = 1/x f(x) = (1/2, 2<x<4) (0,elsewhere) G(Y) = P(Y<y) = P(1/X<y) = P(X>1/Y) = 1 -...

    Started by jamesmartinn‎, 11-06-2008 08:56 PM
    • Replies: 3
    • Views: 6,604
    11-07-2008, 06:45 AM Go to last post
  11. Question transformation problem

    If f_X(x)=6(x-x^2) , 0<x<1, find the distribution of Y=3X^2-2X^3

    Started by Sambit‎, 02-05-2011 01:52 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 6,592
    02-07-2011, 08:36 AM Go to last post
  12. joint pdf question

    I'm not quite sure if I'm approaching this question right... If the joint probability density of X and Y is given by f(x, y) = 24y(1 - x - y)...

    Started by statgirl11‎, 10-28-2009 05:18 PM
    • Replies: 1
    • Views: 6,584
    10-28-2009, 09:30 PM Go to last post
  13. Help with a probability problem

    There were three parts to the following problem I solved with no problem but part D I can't figure out for the life of me. Can anybody offer any...

    Started by vegas1‎, 09-27-2010 10:30 AM
    • Replies: 2
    • Views: 6,571
    09-27-2010, 12:16 PM Go to last post
  14. Traffic light probability question.Need help!!

    Hi, Need help to solve this probability question. At a certain traffic signal red for 30 seconds, yellow for 5 seconds, and green for 25 seconds....

    Started by Shashank Prasad‎, 06-27-2014 04:22 PM
    • Replies: 2
    • Views: 6,569
    08-29-2014, 11:10 AM Go to last post
  15. joint distributions, marginals, conditional

    I am trying to teach myself joint distributions. I've been struggling with how to know what limits of integration to use when finding the marginal...

    Started by NicolaR‎, 03-09-2009 12:11 PM
    • Replies: 0
    • Views: 6,568
    03-09-2009, 12:11 PM Go to last post
  16. probability from moment generating function?

    if the moment generating of a random variable X is M_x(t)=(1-t)^-2 compute P(-2 < X < 3) or explain why it cannot be computed how do I do...

    Started by azazaz‎, 04-08-2009 08:14 AM
    • Replies: 4
    • Views: 6,564
    04-10-2009, 08:27 AM Go to last post
  17. Post Random Variable X

    So this question is on my practice final, and the professor provided the work for how to solve it and I cannot figure it out. Suppose that the...

    Started by iain08‎, 12-13-2011 07:34 PM
    random variable, standard deviation, stats
    • Replies: 14
    • Views: 6,554
    12-13-2011, 09:03 PM Go to last post
  18. 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: 6,543
    10-12-2009, 01:59 PM Go to last post
  19. Help with probability..asap plz

    An entomologist is studying the effect of a chemical sex attractant (pheromone) on insects. Several insects are released at a site equidistant from...

    Started by ena‎, 09-27-2010 06:22 PM
    • Replies: 5
    • Views: 6,543
    10-01-2010, 05:30 AM Go to last post
  20. exact probability, two random variables, normal distribution

    Hi, I've been stuck on this problem for awhile: The problem asks to find the exact probability that X will last longer than Y. It says that on...

    Started by pww‎, 03-08-2010 04:29 PM
    • Replies: 3
    • Views: 6,534
    03-08-2010, 10:30 PM Go to last post
  21. Point (X,Y) is picked inside square

    I saw this problem and we have gone over joint probability but I searched all over my textbook and could not find a problem similar. A point (X,Y)...

    Started by gator78‎, 11-03-2010 11:37 AM
    • Replies: 9
    • Views: 6,532
    11-09-2010, 12:26 PM Go to last post
  22. Counting probability given the mean and standard deviation

    Hi all :-) I'm trying to find solution to the following problem, could anyone please help ? In response to the increasing weight of airline...

    Started by Honka‎, 01-16-2012 01:19 PM
    • Replies: 3
    • Views: 6,525
    01-17-2012, 04:23 PM Go to last post
  23. Question Standard Normal Distribution z0

    I am a beginning student in Statistics. I don't understand the concept of z0, such as "find z0 such that P( -1.2 < z < z0 ) = 0.8671". It's not...

    Started by frd9226‎, 03-05-2008 09:11 AM
    • Replies: 1
    • Views: 6,515
    03-05-2008, 01:37 PM Go to last post
  24. Poisson process, order statistics problem

    Starting at some fixed time, satellites are launched at times of a Poisson process with rate lambda. After an independent amount of time having...

    Started by Ego7894612‎, 09-02-2010 09:21 PM
    • Replies: 1
    • Views: 6,509
    09-03-2010, 06:55 AM Go to last post
  25. How to draw tree diagram

    I have the following problem from my home problem. An oil-prospecting firm hits oil or gas on 10% of its drillings. If the firm drills two wells,...

    Started by Angel_lis‎, 03-07-2010 02:39 PM
    • Replies: 1
    • Views: 6,505
    03-07-2010, 05:53 PM Go to last post
  26. 2 randomly selected have same birthday

    Please help to answer the following question with detailed steps: What is the probability that two randomly selected people have the same...

    Started by Thakur‎, 01-24-2009 02:32 PM
    • Replies: 2
    • Views: 6,502
    01-24-2009, 06:51 PM Go to last post
  27. n-dimensional normal distribution

    Hi. My question is about the theory. For example we have two independent normal distributed variates. Then their joint distribution is also...

    Started by kobylkinks‎, 12-17-2009 08:12 AM
    • Replies: 3
    • Views: 6,500
    12-17-2009, 11:39 AM Go to last post
  28. help?

    11.32: To estimate the mean height u(mew) of male students on your campus, you will measure an SRS of students. You know from gov't data that the...

    Started by california7‎, 02-08-2009 07:22 PM
    • Replies: 2
    • Views: 6,494
    02-09-2009, 04:08 PM Go to last post
  29. Question Please Help Me Out (I'm Desperate)

    I can't figure these 2 problems out. I'm not very good at stats, so they might be easy. Please answer, even if you only know one of them or part of...

    Started by DrPepper1‎, 10-27-2008 10:24 PM
    • Replies: 10
    • Views: 6,493
    10-28-2008, 03:06 AM Go to last post
  30. homework help: how do I solve this without standard deviation? hypothesis testing

    Q7. Law enforcement officers in a city have claimed that over 40% of all robberies committed by those who have a history of drug abuse and/or alcohol...

    Started by jd254‎, 05-07-2009 06:48 AM
    • Replies: 0
    • Views: 6,490
    05-07-2009, 06:48 AM Go to last post
  31. false positive

    A company has developed a new drug screening test which correctly identifies cocaine users 97% of the time; marijuana users 88% of the time and other...

    Started by SadieKhan‎, 09-20-2010 01:32 PM
    • Replies: 3
    • Views: 6,489
    09-21-2010, 03:53 AM Go to last post
  32. I think I did this right

    If x, the time (in minutes) to complete an change job at certain auto service station, is uniformly distributed over the interval 20 to 30,...

    Started by lonerider‎, 11-02-2012 07:35 AM
    • Replies: 1
    • Views: 6,478
    11-02-2012, 02:23 PM Go to last post
  33. Angry Please help!! Basic Probability.

    Hi im having trouble with this question. If anyone could help me out thatd be great , Im not sure where to start! Heres info: The cost of...

    Started by el1‎, 03-30-2008 08:56 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 6,469
    03-30-2008, 10:38 PM Go to last post
  34. Probability | Card deck

    A card is drawn from a well shuffled deck of 52 cards. Find P(drawing a face card or a 4). Now since the cards can't be replaced, would you get...

    Started by chadmac‎, 03-22-2011 01:14 AM
    • Replies: 1
    • Views: 6,447
    03-22-2011, 01:58 AM Go to last post
  35. Baye's Theorem

    Hi, I have two questions that I am struggling with, that concern the Baye's Theorem.... 1) Mr. Smith's gardener is not dependable; the probability...

    Started by Eulia‎, 11-12-2006 04:16 PM
    • Replies: 1
    • Views: 6,428
    11-13-2006, 05:01 AM Go to last post
  36. Weird Probability Problem

    Hi, I'm having trouble with a problem assigned by my teacher that reads: "Assume that you are boarding a flight in which there are five seats and...

    Started by Addlift‎, 10-28-2008 10:14 PM
    • Replies: 5
    • Views: 6,422
    11-01-2008, 03:49 PM Go to last post
  37. Moving window of Standard Deviation

    I'm not sure how best to phrase this, so please bear with me: I have a stochastic process from which I can measure one representative value per...

    Started by mosler‎, 12-24-2008 10:25 AM
    • Replies: 4
    • Views: 6,417
    12-30-2008, 07:56 PM Go to last post
  38. Fishing Probability

    The probability that Pete will catch fish on a particular day when he goes fishing is .8. Pete is going fishing 3 days next week. The probability...

    Started by mbusa‎, 04-22-2012 03:44 PM
    • Replies: 1
    • Views: 6,415
    04-22-2012, 04:17 PM Go to last post
  39. null hypothesis questions

    A manufacturer of computer memory chips produces chips in lots of 1000. If nothing has gone wrong in the manufacturing process, at most 7 chips each...

    Started by steve456‎, 08-07-2010 05:37 PM
    • Replies: 6
    • Views: 6,411
    08-08-2010, 04:44 PM Go to last post
  40. zero inflated poisson distribution

    I am new and I hope I'm abiding to the rules. I just wanted to know what exactly a zero inflated Poisson distribution is? How is it related to the...

    Started by mekhi‎, 03-16-2010 05:32 AM
    • Replies: 2
    • Views: 6,401
    03-16-2010, 09:21 AM Go to last post
  41. y follows a Poisson distribution with rate lambda*x

    Assume that the number of faults in the roll, say y, follows a Poisson distribution with rate lambda*x, where x is the length of the roll. Does this...

    Started by zzzc‎, 11-10-2010 03:07 PM
    • Replies: 4
    • Views: 6,386
    12-05-2010, 05:27 PM Go to last post
  42. Prob of Real Roots

    Hi TalkStats, This is my first post. If someone could help me solve this problem I would be very grateful. Question: A,B,C are independent...

    Started by maccaman‎, 08-16-2009 04:09 AM
    • Replies: 3
    • Views: 6,385
    08-17-2009, 12:01 PM Go to last post
  43. Ratio of two independent gamma random variables

    Hello, I am working on a problem in which I need to find the expectation of the square root of the ratio of two independent gamma random variables...

    Started by GTaiko‎, 01-16-2013 10:40 PM
    • Replies: 5
    • Views: 6,384
    01-17-2013, 10:44 AM Go to last post
  44. Normal distribution probability density function returning values > 1

    i am trying to draw a normal curve over a histogram of some data of mine and i just can't get it to come out right! Mean =1.002327404 Standard...

    Started by method‎, 10-02-2008 11:27 AM
    • Replies: 11
    • Views: 6,382
    10-03-2008, 04:50 PM Go to last post
  45. Stuck on Setting upa problem.

    I been having a problem solving this type of question. I have the answers to this along with variations of the same problem, but I am still un able...

    Started by sublime‎, 04-24-2006 08:05 PM
    • Replies: 1
    • Views: 6,378
    04-24-2006, 08:57 PM Go to last post
  46. Transformation of univariate random variables

    Hi all, I need help with two problems: Problem1: Let U and V be iid Uniform(-1,1). Furthermore, let W=U^2 + V^2 and Z = U / sqrt(W). What is...

    Started by JennySton‎, 02-07-2010 07:38 PM
    • Replies: 3
    • Views: 6,371
    02-08-2010, 08:42 AM Go to last post
  47. Joint and marginal pdf

    Hello everyone. I need help in the following question: Let the joint distribution of X and Y be given as f(x,y)=2*exp{-(x+y)}, 0<x<y</infty a)...

    Started by n00b‎, 07-05-2009 12:16 PM
    • Replies: 0
    • Views: 6,369
    07-05-2009, 12:16 PM Go to last post
  48. Help with these probability problems

    1. Conditional Prob: Approximately 1/125 of all births are fraternal twins and 1/300 of births are identical twins. Elvis Presley had a twin brother...

    Started by yupeh‎, 12-30-2006 06:59 AM
    • Replies: 1
    • Views: 6,366
    01-13-2007, 12:58 PM Go to last post
  49. Need help please!!

    A recent study of 300 patients found that of 100 alcoholic patients, 87 had elevated cholestrol levels, and of 200 nonalcoholic patients, 43 had...

    Started by rawdigginz26‎, 01-24-2012 04:26 PM
    • Replies: 1
    • Views: 6,365
    01-25-2012, 12:31 AM Go to last post
  50. Probabilities of Gender Sequences

    nCr and nPr doesn't seem to get me anywhere. What the duece?

    Started by Masterbillygrind‎, 10-03-2006 04:49 PM
    • Replies: 2
    • Views: 6,364
    10-04-2006, 02:17 PM Go to last post
  51. Hypergeometric distribution

    Hi, The problem is- A shipment of 20 cameras includes 3 that are defective. What is the minimum number of cameras that must be selected if we...

    Started by MonitorStats‎, 04-04-2009 10:26 PM
    • Replies: 1
    • Views: 6,360
    04-04-2009, 11:49 PM Go to last post
  52. Expected value

    Hi, have a question about expected value, there is only a few lines my text book regarding this. The prizes that can be won in a sweepstakes are...

    Started by tejay‎, 02-25-2006 10:13 PM
    • Replies: 2
    • Views: 6,352
    02-25-2006, 10:50 PM Go to last post
  53. Help with Bayesian question please

    Just got a question with Bayes problem, I always struggle to understand the actual question in Bayes problems so that could be why I'm stuck, but...

    Started by jamessuh36‎, 07-22-2015 08:31 PM
    4 Pages
    1 2 3 ... 4
    • Replies: 48
    • Views: 6,351
    07-27-2015, 09:48 AM Go to last post
  54. Find unbiased estimator of minimum variance

    Hi, I'm new to this area of statistics and I could really use some help. Suppose that random variables Y1 and Y2 are independent, both with mean u...

    Started by mada2009‎, 01-22-2012 05:27 PM
    • Replies: 3
    • Views: 6,340
    01-22-2012, 10:16 PM Go to last post
  55. Poisson Distribution

    Hi: I was wondering if there is a proof (or reference) for the following property of the Poisson distribution: Go here, ...

    Started by jamesmartinn‎, 01-07-2010 08:26 PM
    • Replies: 2
    • Views: 6,335
    01-08-2010, 09:54 AM Go to last post
  56. Exclamation help with exponential distribution

    X1,X2,...,XN are independently identically exponentially distributed with expected value of 5. How can I compute Xn when n=20 and N=1000? Then...

    Started by omega‎, 11-29-2010 07:33 PM
    • Replies: 7
    • Views: 6,332
    11-30-2010, 12:13 AM Go to last post
  57. Conditional Expectation question

    My final is on Mon, and I got this HW problem wrong from last week, and I still don't understand why. An item is selected randomly from a...

    Started by StatStudent3‎, 12-09-2010 10:23 PM
    • Replies: 6
    • Views: 6,329
    12-21-2010, 07:11 AM Go to last post
  58. Help with Confidence Intervals

    The questions regarding confidence intervals and population means are hard to understand: Please help me set them up in a formula and solve. #3 ...

    Started by Rugrats3‎, 09-25-2005 04:12 PM
    • Replies: 4
    • Views: 6,322
    09-26-2005, 10:01 AM Go to last post
  59. Please help me with this problem

    The random variable x represents the number of boys in a family of three children. Assuming that boys and girls are equally likely, find the mean and...

    Started by davidmav19‎, 10-27-2010 06:21 PM
    • Replies: 13
    • Views: 6,321
    10-27-2010, 09:12 PM Go to last post
  60. Probability inequalities

    I wanna solve following questions: 1-Let X be a discret random variable ,whose possible values are 1,2,....,If P(X=k)is nonincreasing in...

    Started by Emy‎, 06-04-2010 11:21 AM
    • Replies: 9
    • Views: 6,313
    06-15-2010, 04:22 PM Go to last post

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