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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: 30,361
    09-30-2005, 09:44 AM Go to last post
  1. Unhappy hello

    I need help with a few questions A carton of 12 batteries contains one that is bad. in how many ways can an inspector choose 3 of the batteries...

    Started by Kingkye‎, 10-17-2006 09:43 PM
    • Replies: 1
    • Views: 1,874
    10-18-2006, 11:23 AM Go to last post
  2. help me please!

    I do not need the answers to these questions, i just need to know how to solve them!!! please!! question 1: A board consisting of 8 members, 3 men...

    Started by juicefang‎, 10-17-2006 05:00 PM
    • Replies: 0
    • Views: 2,303
    10-17-2006, 05:00 PM Go to last post
  3. Smile Probability

    Question : Jane wants to do her MSc in statistics. She appliesa to two universities. Assume the acceptance rate at University A is 25% and at...

    Started by edwim12‎, 09-06-2005 08:49 PM
    • Replies: 4
    • Views: 4,454
    10-15-2006, 05:57 AM Go to last post
  4. Probability Question -- Begging for help.

    Please help me solve this problem. In a population, 60% of people are liberals. In a 6 person sample of that population what is the probability...

    Started by icndvl‎, 10-12-2006 12:15 PM
    • Replies: 2
    • Views: 2,052
    10-13-2006, 08:59 AM Go to last post
  5. function of one and two random variables

    Hi I need some help with the following question. The f(x) is given in the attachment. According to this height of the rectangle from a to a can be...

    Started by pwsayd‎, 10-12-2006 06:06 PM
    • Replies: 0
    • Views: 3,024
    10-12-2006, 06:06 PM Go to last post
  6. Coin A Coin B

    Coin A is flipped 3 times and coin B 4 times. What is the probability that the number of tails obtained from flipping the 2 fair coins is the same?

    Started by Whitney‎, 10-04-2006 11:15 PM
    • Replies: 4
    • Views: 2,767
    10-11-2006, 11:11 AM Go to last post
  7. Exclamation Help!!

    I have been trying to figure this problem out...I know it is probably the easiest thing, but I just can't put my finger on it.... If anyone could...

    Started by alysa ann‎, 10-10-2006 11:50 AM
    • Replies: 1
    • Views: 1,719
    10-11-2006, 08:40 AM Go to last post
  8. Probablity Question!! HELP PLEASE~~

    Suppose that (X, Y) is uniformly distributed over the region defined by 0<y<1-x^2 and -1<x<1, find the joint density.

    Started by abcboy‎, 10-10-2006 08:32 PM
    • Replies: 1
    • Views: 2,531
    10-10-2006, 11:41 PM Go to last post
  9. Question Probability Questions with Cards

    I have this problem in my homework and I'm having trouble with it even if it is probably easy! Can anyone help?? There are 52 cards in a deck of...

    Started by rfasten‎, 10-09-2006 04:06 PM
    • Replies: 2
    • Views: 3,672
    10-09-2006, 04:55 PM Go to last post
  10. Probability Distributions and Densities homework help

    Probability distribution for RV X is given by f(x) = { 1/5 for 2 < x < 7; 0 elsewhere find P(3 < X < 5) as a fraction. also, Show that...

    Started by Leper Messiah‎, 10-08-2006 07:36 PM
    • Replies: 3
    • Views: 2,651
    10-09-2006, 03:38 PM Go to last post
  11. I need help ASAP!?!?!

    I am having trouble with these problems on my homework. I can't seen to grasp the concept and set up on how to solve these problems. The numbers...

    Started by mrmntss‎, 10-08-2006 06:17 PM
    • Replies: 1
    • Views: 4,866
    10-09-2006, 10:26 AM Go to last post
  12. Please Help~~~

    Let say if player A scores an average of 3 points per game, and he has played a tons of games already. What fraction of his games will be exactly...

    Started by abcboy‎, 10-05-2006 10:03 PM
    • Replies: 3
    • Views: 2,508
    10-09-2006, 10:13 AM Go to last post
  13. New bee in probability..plzz help..

    There are 5 red balls and 5 green balls in an upturned hat. If you remove the balls from the hat at random what are the chances of the following? ...

    Started by Shruti‎, 10-08-2006 10:44 PM
    • Replies: 0
    • Views: 1,791
    10-08-2006, 10:44 PM Go to last post
  14. Joint Probability Distribution

    Can anyone help? The problem: Experiment = {A balance six-sided die is rolled twice} Random Variable X = {the number of 4s obtained in two...

    Started by mgaleai728‎, 10-06-2006 07:16 PM
    • Replies: 3
    • Views: 3,645
    10-08-2006, 09:28 PM Go to last post
  15. deck of cards

    A person selects a card from an ordinary deck of cards. If it is a black card, she wins $3. If it is a red card between or including 2 and 8, she...

    Started by Whitney‎, 10-04-2006 11:31 PM
    • Replies: 1
    • Views: 3,836
    10-06-2006, 11:28 AM Go to last post
  16. selecting randomly from a sample

    Hi, I have a sample of 400 observations. if I want to select randomly 100 out of the 400. could I have 5000 different combinations of the elements...

    Started by 12345678‎, 10-05-2006 11:27 AM
    • Replies: 2
    • Views: 2,355
    10-06-2006, 12:40 AM Go to last post
  17. Overlaping Normal Curves

    Folks, In an ecological model, I must compute the overlap of two standardized normal curves (correct term? ... areas of 1, but means and...

    Started by Rboone2020‎, 09-28-2006 05:14 PM
    • Replies: 14
    • Views: 4,771
    10-05-2006, 11:03 AM Go to last post
  18. win money

    A man won money when he bet unsuspecting patrons that in 4 rolls of a die, he could get at least one six, but he lost money when he bet that in 24...

    Started by Whitney‎, 10-04-2006 11:36 PM
    • Replies: 1
    • Views: 2,077
    10-05-2006, 06:47 AM Go to last post
  19. Given probability calculate std dev

    Given normal distribution, mean 500, .95 probability of value between 451 and 549, what is the std dev? How would you calculate the std dev? Thanks.

    Started by proggy‎, 10-04-2006 10:49 PM
    • Replies: 1
    • Views: 3,426
    10-05-2006, 06:44 AM Go to last post
  20. bag of marbles

    A bag with red marbles and blue marbles has more blue than red. If you add red marbles until 1/3 of the marbles in the bag are blue; yellow marbles...

    Started by Whitney‎, 10-04-2006 11:33 PM
    • Replies: 0
    • Views: 2,658
    10-04-2006, 11:33 PM Go to last post
  21. Chuck-a-luck

    in the game chuck-a-luck, three dice are rolled. A player bets a certain amount (say $1) on a number from one to six. If the number appears on one...

    Started by Whitney‎, 10-04-2006 11:23 PM
    • Replies: 0
    • Views: 3,871
    10-04-2006, 11:23 PM Go to last post
  22. 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: 6,386
    10-04-2006, 02:17 PM Go to last post
  23. Help With Negative Binomial Distribution

    The negative binomial (Pascal) distribution is defined as: n = alpha + k -1 P(subK)= How do you show that the Variance is: V = alpha...

    Started by lilaznjedi‎, 10-02-2006 07:53 AM
    • Replies: 0
    • Views: 2,637
    10-02-2006, 07:53 AM Go to last post
  24. random problems

    I get extremely confused about how to solve these problems. I don't even have examples to go by. For instance: In how many different ways can...

    Started by bmonkey‎, 10-01-2006 08:42 PM
    • Replies: 1
    • Views: 2,127
    10-02-2006, 02:24 AM Go to last post
  25. Help Please!!

    1.Given f(-1) = 0.15, f(1) = 0.29, f(3) = 0.21, and f(5) = 0.35, find P(X ≤ 1) 2.Given f(-1) = 0.15, f(1) = 0.29, f(3) = 0.21, and f(5) = 0.35,...

    Started by Leper Messiah‎, 10-01-2006 08:57 PM
    • Replies: 1
    • Views: 1,983
    10-02-2006, 02:00 AM Go to last post
  26. 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: 3,128
    10-01-2006, 03:38 PM Go to last post
  27. Tree Diagram

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

    Started by n2c2mm2nt‎, 09-27-2006 09:52 PM
    • Replies: 7
    • Views: 5,599
    09-29-2006, 11:18 AM Go to last post
  28. Beginning Bayes problem

    I'm getting about every other question right, and since the back of the book only has answers, not whole solutions, I can't tell what I'm doing...

    Started by Turbowaffle‎, 09-27-2006 12:18 PM
    • Replies: 1
    • Views: 11,714
    09-27-2006, 06:24 PM Go to last post
  29. Keno or LOTTO style

    So, here is how the game goes. suppose that the game uses the numbers 1 through 50 and suppose that the operator selects eight of these. If the...

    Started by panz‎, 02-06-2006 05:41 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 10,583
    09-27-2006, 04:41 PM Go to last post
  30. Probability Density Function

    Given that: f(y1, y2) = 3 - 3y2 where 0 < y1 < y2 < 1 I'm trying to find the probability: P(Y1 < .5|Y2 < .75), which is a conditional density. ...

    Started by structstat‎, 09-22-2006 09:43 PM
    • Replies: 1
    • Views: 5,129
    09-27-2006, 12:01 PM Go to last post
  31. Cool Anyone can help me?

    I have a question asking about how to calculate the probability when the number of outcomes is not finite. Two points L and M are placed...

    Started by okblackwhite‎, 09-27-2006 06:29 AM
    • Replies: 0
    • Views: 1,786
    09-27-2006, 06:29 AM Go to last post
  32. Another Bayes Problem

    Hello, thanks for taking the time to look at my question. I'm a first year student at a university in VA and I'm taking an entry level statistics...

    Started by WillNjmu‎, 09-23-2006 10:13 PM
    • Replies: 6
    • Views: 3,495
    09-25-2006, 08:45 AM Go to last post
  33. Average probability and empirical probability

    This is probably very simple. The problem I have relates to a far more complex calculation, but if I can understand the maths it will be easy enough...

    Started by rancid98‎, 09-19-2006 08:27 PM
    • Replies: 2
    • Views: 4,316
    09-24-2006, 09:08 PM Go to last post
  34. Expectation, variance and covariance question

    Hi I have a question which I stuck some point. Question: X_t, X_s, Y_t, Y_s, Z_t, Z_s, (~Z_t), (~Z_s) are i.i.d time series r.v. (~ is tilda...

    Started by whui‎, 09-24-2006 06:58 PM
    • Replies: 0
    • Views: 3,323
    09-24-2006, 06:58 PM Go to last post
  35. p(x)=0, even though x can occur !

    For a continuous distribution: p(x)=0, even though x can occur. I can understand this statement, since I can imagine that there is an infinite number...

    Started by salanr6‎, 09-21-2006 10:11 AM
    • Replies: 4
    • Views: 2,922
    09-24-2006, 10:39 AM Go to last post
  36. probability

    what is hypergeometric experiment?

    Started by brunett‎, 09-22-2006 11:10 PM
    • Replies: 4
    • Views: 2,527
    09-24-2006, 09:38 AM Go to last post
  37. prove inequality

    inequality theorem

    Started by brunett‎, 09-23-2006 05:48 PM
    • Replies: 0
    • Views: 3,689
    09-23-2006, 05:48 PM Go to last post
  38. A solitaire game with no possible moves?

    Hi everyone. I just opened a solitaire game on my computer with no moves possible. Does anyone have any idea what the probability of this happening...

    Started by wlawson86‎, 09-21-2006 09:17 PM
    • Replies: 0
    • Views: 2,431
    09-21-2006, 09:17 PM Go to last post
  39. 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: 2,802
    09-21-2006, 07:43 PM Go to last post
  40. probability distribution

    A school is administering a final examination. assume that the length of time required to complete the test is normally distributed, with a mean of...

    Started by sweetx‎, 09-21-2006 11:26 AM
    • Replies: 3
    • Views: 2,603
    09-21-2006, 07:24 PM Go to last post
  41. I need help in finding the probability

    Assume that male and female births are equally likely and that the birth of any child does not affect the probability of the gender of any other...

    Started by JBM‎, 09-21-2006 02:31 PM
    • Replies: 1
    • Views: 6,323
    09-21-2006, 03:31 PM Go to last post
  42. Question Test score probabilities problem

    Hi, appreciate any help you can provide. I tested patterns on salamanders as personal identifiers by giving human subjects images of 7 different...

    Started by mantid‎, 09-21-2006 10:16 AM
    • Replies: 0
    • Views: 2,711
    09-21-2006, 10:16 AM Go to last post
  43. probability

    a pharmaceutical firm claims that a certain medication is 92% effective in relieving arthric pain. if ten people who suffer from arthritis are...

    Started by sweetlady‎, 09-01-2006 08:47 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 5,822
    09-21-2006, 08:28 AM Go to last post
  44. counting rules

    "A fleet of ten taxis is to be dispatched to three locations in such a way that three taxis go to the first location, five taxis go to the second...

    Started by jettagrl‎, 09-19-2006 08:07 PM
    • Replies: 3
    • Views: 3,914
    09-21-2006, 06:51 AM Go to last post
  45. a probability problem

    there are 1000 coins in a bag of which 999 are normal coins (with a head and a tail), and 1 is a ``freak'' coin which has two heads. if one coin is...

    Started by mithrandil‎, 09-19-2006 05:30 PM
    • Replies: 1
    • Views: 2,526
    09-19-2006, 08:17 PM Go to last post
  46. Stuck on a problem that should be easy

    So this is one of the first problems in our chapter on probability. I'm assuming I am supposed to intuit how to do this, because there are no other...

    Started by Turbowaffle‎, 09-19-2006 01:14 PM
    • Replies: 6
    • Views: 5,086
    09-19-2006, 02:57 PM Go to last post
  47. Probability Question

    I am having problems with this problem. What forumula would I use, and how would I do this problem. A product has five ways in which it might...

    Started by hiluxsurf‎, 09-19-2006 08:36 AM
    • Replies: 4
    • Views: 2,218
    09-19-2006, 09:25 AM Go to last post
  48. Probabilty question

    I am trying to figure this problem out. I know it seems simple, but for some reason I am having a hard time with this. Can someone show me how to...

    Started by darktiger‎, 09-18-2006 08:15 PM
    • Replies: 1
    • Views: 3,037
    09-18-2006, 08:40 PM Go to last post
  49. Pie slices

    Hi all, I would like to know what the probability distribution for the number of pie slices could be. Or the stochastic process behind slicing....

    Started by creditrisk‎, 09-17-2006 12:53 PM
    • Replies: 0
    • Views: 1,943
    09-17-2006, 12:53 PM Go to last post
  50. Quick Probability Question

    Here's a quick probability question that's been stumping me this afternoon: If I have 9 novels randomly placed on a bookshelf and I remove them...

    Started by JZDunbar‎, 09-14-2006 08:26 PM
    • Replies: 2
    • Views: 2,587
    09-16-2006, 08:52 PM Go to last post
  51. Geometric Distribution

    A geometric Distribution is a discrete probability distribution of a random variable x that satisifies: 1. A trial is repeated unitl a success...

    Started by galactus‎, 09-14-2006 05:48 PM
    • Replies: 0
    • Views: 26,824
    09-14-2006, 05:48 PM Go to last post
  52. Test Score Probability

    Im trying to compare my grade on my Algebra exam to my fellow students using the normal distribution. Here are the results of the exam: ...

    Started by ciddis‎, 09-14-2006 09:12 AM
    • Replies: 1
    • Views: 6,148
    09-14-2006, 01:00 PM Go to last post
  53. 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: 2,881
    09-14-2006, 12:43 PM Go to last post
  54. I'm curious...

    I was just looking over an old exam, and I came across a problem with T scores. I know how to work with z scores, but I'm confused with T scores. I...

    Started by Christy‎, 09-13-2006 08:23 PM
    • Replies: 1
    • Views: 2,299
    09-13-2006, 08:35 PM Go to last post
  55. Help! Expected value, standard deviations and probabilities...

    Hi I have no clue how to even start this....it's been a long time since I've done stats...and this is for a finance class: Suppose a firm's stock...

    Started by Qristel‎, 09-13-2006 06:39 PM
    • Replies: 0
    • Views: 2,521
    09-13-2006, 06:39 PM Go to last post
  56. Probability question

    If probability A and B are 0.5 each, how do you find that a probability of A is more than three times the P(B)? Do you simply do: P(A)^3?

    Started by structstat‎, 09-12-2006 01:42 PM
    • Replies: 3
    • Views: 4,000
    09-12-2006, 07:05 PM Go to last post
  57. Probability Game

    A marble is hidden in one of the three boxes. You have to go through two steps: 1. Select one of the boxes. As soon as you selected one of the...

    Started by lilaznjedi‎, 09-11-2006 03:20 PM
    • Replies: 2
    • Views: 2,891
    09-11-2006, 11:45 PM Go to last post
  58. Need Help Please

    There is a group of 200 college students, 138 are taking psychology, 115 are taking sociology, and 91 are taking both. a.) How many of the...

    Started by Leper Messiah‎, 09-10-2006 09:24 PM
    • Replies: 4
    • Views: 5,350
    09-10-2006, 10:48 PM Go to last post
  59. Question Bayes Theorem - JohnM vs my textbook

    To JohnM or anyone who knows... I am struggling with positive and negative predictive values (PPV and NPV) homework problems. My textbook...

    Started by ALvr‎, 09-10-2006 05:19 PM
    • Replies: 2
    • Views: 2,994
    09-10-2006, 08:27 PM Go to last post
  60. 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: 3,080
    09-10-2006, 05:17 PM Go to last post

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