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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: 30,323
    09-30-2005, 09:44 AM Go to last post
  1. General Comments Regarding Odds

    "To get the probability of winning the jackpot, multiply .00000034847 by the probability of matching the power ball, to get .0000000082969 or odds of...

    Started by quark‎, 08-29-2005 10:18 PM
    • Replies: 0
    • Views: 3,162
    08-29-2005, 10:18 PM Go to last post
  2. Buffon's Needle Experiment

    This problem is quite interesting: A fine needle of length l is dropped at random on a board covered with parallel lines distance d apart where...

    Started by quark‎, 10-04-2005 02:08 PM
    • Replies: 0
    • Views: 8,610
    10-04-2005, 02:08 PM Go to last post
  3. Conditional Probability

    To reduce theft, the ABCD Company screens all its employees with a lie detector test that is known to be correct 90 percent of the time (for both...

    Started by quark‎, 10-30-2005 11:59 PM
    • Replies: 0
    • Views: 7,525
    10-30-2005, 11:59 PM Go to last post
  4. Binomial Probabilities

    These kinds of questions can be answered using the binomial probability distribution: 1. If I flip a coin 20 times, what is the probability of...

    Started by JohnM‎, 11-01-2005 02:50 PM
    • Replies: 0
    • Views: 49,061
    11-01-2005, 02:50 PM Go to last post
  5. Post Symbols in statistics

    x^n x to the power of n, x^2 is x squared nPr Permutation, nPr = n!/(n-r)! nCr Combination, nCr = n!/(r!(n-r)!) P(A|B)

    Started by quark‎, 11-07-2005 04:11 PM
    • Replies: 0
    • Views: 10,959
    11-07-2005, 04:11 PM Go to last post
  6. Poisson distribution

    The Poisson Distribution is often used as a model for the number of events occuring within a specific time period. The Poisson probability mass...

    Started by quark‎, 11-17-2005 12:25 PM
    • Replies: 0
    • Views: 23,420
    11-17-2005, 12:25 PM Go to last post
  7. Hypergeometric Probabilities

    These are similar in principle to the binomial distribution, with one major exception - the hypergeometric probability is for situations where you...

    Started by JohnM‎, 02-20-2006 11:59 AM
    • Replies: 0
    • Views: 12,563
    02-20-2006, 11:59 AM Go to last post
  8. help please

    You are doing an industry analysis of the Bloomington pizza industry. The rate (per year) at which pizza restaurants enter the industry is given by...

    Started by AkinIE‎, 02-28-2006 12:09 PM
    • Replies: 0
    • Views: 3,747
    02-28-2006, 12:09 PM Go to last post
  9. Proof

    Hi everybody! We would like to proof the following statement: given a random variable X with probability density function f(x) having support in...

    Started by jdelser‎, 03-09-2006 09:52 AM
    • Replies: 0
    • Views: 2,489
    03-09-2006, 09:52 AM Go to last post
  10. Question In a certain town....

    40% of voters favor a given ballot measure. For groups of 22 voters, find the mean and standard deviation for the number who favor the measure.

    Started by mayday‎, 03-19-2006 10:21 PM
    • Replies: 0
    • Views: 4,332
    03-19-2006, 10:21 PM Go to last post
  11. creating sten scores

    Hi, Please can someone help me out with creating a sten score - I am unsure of the process to follow to do this - is it something that can be...

    Started by AnnaHoy‎, 03-20-2006 12:01 AM
    • Replies: 0
    • Views: 6,016
    03-20-2006, 12:01 AM Go to last post
  12. Question HELP studying for a FINAL EXAM

    Hello everyone, I have a final that I am studying for, the final isnt till thursday. But I am having problems soving some probability problems, I...

    Started by Ayisha‎, 03-20-2006 06:39 PM
    • Replies: 0
    • Views: 2,544
    03-20-2006, 06:39 PM Go to last post
  13. Unhappy Realing struggling

    I know this is probably a simple problem, but I can't seem to wrap my brain around it. Here it is: You are dealt 5 cards from a well shuffled,...

    Started by jjmeans‎, 04-15-2006 07:00 PM
    • Replies: 0
    • Views: 2,930
    04-15-2006, 07:00 PM Go to last post
  14. Exclamation Yet more problems!!!

    OK. Like I said. I am really struggling with this. Here are two more I can't grasp. 1. You are fishing at a Reservoir. The Department of...

    Started by jjmeans‎, 04-15-2006 07:08 PM
    • Replies: 0
    • Views: 2,084
    04-15-2006, 07:08 PM Go to last post
  15. Probability involving stock market help pls

    Stock A and stock B. Every day the price of stock A will either increase by 1 dollar with probability 0.6 or decrease by one dollar with...

    Started by -illuzion-b18c1‎, 04-19-2006 04:59 PM
    • Replies: 0
    • Views: 3,567
    04-19-2006, 04:59 PM Go to last post
  16. Normal Distribution Problem

    I'm having trouble getting this one started: Jake runs the concession stand for a Chicago area minor league baseball team. He knows that hot dog...

    Started by ktgurrl‎, 04-20-2006 08:58 PM
    • Replies: 0
    • Views: 3,408
    04-20-2006, 08:58 PM Go to last post
  17. Question Conditional Probability and Variance

    In a conditional probability problem, I have computed Var(X|Y=y) for all values of y. How would I go about computing the Var(X) using this...

    Started by ProbabilityPrincess‎, 04-20-2006 09:59 PM
    • Replies: 0
    • Views: 3,998
    04-20-2006, 09:59 PM Go to last post
  18. Exclamation Help! Test Tomorrow

    O.K. Here is my question that I am struggling with: Of all college freshman that try out for the track team, the coach will accept only 30%. If 15...

    Started by jjmeans‎, 04-20-2006 11:24 PM
    • Replies: 0
    • Views: 5,109
    04-20-2006, 11:24 PM Go to last post
  19. poisson process probability distributions

    Started by macro90‎, 04-20-2006 11:56 PM
    • Replies: 0
    • Views: 3,079
    04-20-2006, 11:56 PM Go to last post
  20. Exponential Probability

    Data are observed on lifetime of 5 electronic units (in hundreds of hours): 6.7, 5.0+, 6.1, 8.0, 10.0 where the "+" denotes that the unit's...

    Started by skip_it2‎, 04-26-2006 10:16 AM
    • Replies: 0
    • Views: 2,552
    04-26-2006, 10:16 AM Go to last post
  21. P Value

    38 of 120 high school students work over 20 hours per week. Does this demonstrate that more than 25% of high school students work over 20 hours...

    Started by Sully‎, 05-24-2006 11:39 PM
    • Replies: 0
    • Views: 3,155
    05-24-2006, 11:39 PM Go to last post
  22. random variables/probability distributions

    nevermind:)

    Started by Michelle‎, 06-01-2006 08:34 PM
    • Replies: 0
    • Views: 2,189
    06-01-2006, 08:34 PM Go to last post
  23. another Probabilty distribution :)

    Hi, okay here is another probabitly question that I was having trouble with. Q1: A company services home air conditioners. It is knwon that time...

    Started by Michelle‎, 06-01-2006 08:46 PM
    • Replies: 0
    • Views: 4,715
    06-01-2006, 08:46 PM Go to last post
  24. conditional mean of a lognormal variable

    Hi, does anyone know whether there exists a code or program to calculate the conditional mean of a lognormal variable, e.g. E? Thanks, tarama

    Started by tarama‎, 06-06-2006 11:03 AM
    • Replies: 0
    • Views: 3,148
    06-06-2006, 11:03 AM Go to last post
  25. Difference between two Normal Distributions

    I have a problem where I have two Normal distributions both with a standard deviation of 20 and a difference between the means of 17. I want to work...

    Started by tja26‎, 06-13-2006 10:41 AM
    • Replies: 0
    • Views: 8,066
    06-13-2006, 10:41 AM Go to last post
  26. Analyzing test results- Normal Distribution

    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, 06-20-2006 10:02 AM
    • Replies: 0
    • Views: 5,734
    06-20-2006, 10:02 AM Go to last post
  27. confidence in expected value

    Hi, My question is about confidence levels in expected values for a distribution that is being sampled. Assume we have two different probability...

    Started by ragip‎, 06-21-2006 04:43 AM
    • Replies: 0
    • Views: 2,455
    06-21-2006, 04:43 AM Go to last post
  28. Mum's doubt...

    Hi, I need some help for my mum... Here's it: How can you calculate k, knowning that X~N(a,b) and P(X>k)=c with c>0.5? :confused: I know that...

    Started by dilasluis‎, 06-25-2006 02:56 PM
    • Replies: 0
    • Views: 2,156
    06-25-2006, 02:56 PM Go to last post
  29. Probability Question

    Problem I'm working on. Mean-242.2; Standard deviation =45.4; Using a normal probability distribution function I have calculated various...

    Started by bella‎, 06-28-2006 05:15 PM
    • Replies: 0
    • Views: 2,082
    06-28-2006, 05:15 PM Go to last post
  30. Exam Review Question: Poisson Probability

    I have gone over my exam review and I understand most of the questions on the review, but here is a question I am not sure how to solve. I know the...

    Started by iLLogic‎, 07-23-2006 06:56 PM
    • Replies: 0
    • Views: 4,331
    07-23-2006, 06:56 PM Go to last post
  31. Poisson distribution...anyone good with those?

    The question is: 4.One department store has two entrances. The number of car entered each entrance are Poisson distribution. The first entrance...

    Started by koss123‎, 07-28-2006 10:44 PM
    • Replies: 0
    • Views: 2,288
    07-28-2006, 10:44 PM Go to last post
  32. Calculating "p-value"

    Hello, I'm brand new to this site...and trying to figure out (I know this is probably very elementary to all of you) "What is the value that appears...

    Started by rick‎, 07-29-2006 10:51 AM
    • Replies: 0
    • Views: 2,729
    07-29-2006, 10:51 AM Go to last post
  33. Question counting rule questions

    Consider 5 card poker hands dealt from a 52 card deck. two important events are: A(you draw a flush), B(you draw a straight). Q: find P(A)? find...

    Started by new‎, 07-29-2006 04:55 PM
    • Replies: 0
    • Views: 2,600
    07-29-2006, 04:55 PM Go to last post
  34. High Sig. Values in ANOVA and post-hoc?

    I have another question, which I'm looking for a statistical opinion on. On the ANOVA & Post-hoc analysis in SPSS: When we look for statistical...

    Started by Billyvic‎, 07-30-2006 12:34 PM
    • Replies: 0
    • Views: 2,499
    07-30-2006, 12:34 PM Go to last post
  35. Question Is it a normal distribution?

    The median income of residents in a certain community is $20,000. If 1,000 peopole are randomly sampled from the population of residents, let x equal...

    Started by new‎, 08-01-2006 03:29 PM
    • Replies: 0
    • Views: 1,996
    08-01-2006, 03:29 PM Go to last post
  36. Need help with this assignment.

    Please help me with this assignment: A. cash back when the consumer make an online purchase; B. cash back when the consumer make a purchase at...

    Started by winston waldron‎, 08-25-2006 11:32 PM
    • Replies: 0
    • Views: 2,514
    08-25-2006, 11:32 PM Go to last post
  37. Simple prob?

    Demand for a car is normally distributed with a certain mean and stdev. There is a lead time of exactly "x" number of weeks for a car order. ...

    Started by lp100‎, 08-28-2006 11:08 PM
    • Replies: 0
    • Views: 2,078
    08-28-2006, 11:08 PM Go to last post
  38. Question student-t to N(0,1)

    PLS. HELP HOW DO YOU SHOW THAT THE lim as p->infinity f(x|p) = (1/sqrt2pi)e^-(x^2/2),:( :( where f(x|p) is a student t distn with p degrees of...

    Started by rd_axia‎, 09-04-2006 05:38 PM
    • Replies: 0
    • Views: 2,209
    09-04-2006, 05:38 PM Go to last post
  39. 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: 2,508
    09-13-2006, 06:39 PM Go to last post
  40. 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: 26,806
    09-14-2006, 05:48 PM Go to last post
  41. 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: 1,938
    09-17-2006, 12:53 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: 2,706
    09-21-2006, 10:16 AM Go to last post
  43. 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: 2,423
    09-21-2006, 09:17 PM Go to last post
  44. prove inequality

    inequality theorem

    Started by brunett‎, 09-23-2006 05:48 PM
    • Replies: 0
    • Views: 3,677
    09-23-2006, 05:48 PM Go to last post
  45. 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: 3,310
    09-24-2006, 06:58 PM Go to last post
  46. 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: 1,784
    09-27-2006, 06:29 AM Go to last post
  47. 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: 2,632
    10-02-2006, 07:53 AM Go to last post
  48. 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: 3,858
    10-04-2006, 11:23 PM Go to last post
  49. 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: 2,656
    10-04-2006, 11:33 PM Go to last post
  50. 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: 1,781
    10-08-2006, 10:44 PM Go to last post
  51. 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: 3,015
    10-12-2006, 06:06 PM Go to last post
  52. 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: 2,299
    10-17-2006, 05:00 PM Go to last post
  53. Probability Help

    There are 5 problems I just can't get. The set up is that there are twenty ice cream cones with 5 flavors (cherry, vanilla, chocolate, strawberry,...

    Started by SlayerX‎, 10-21-2006 11:07 PM
    • Replies: 0
    • Views: 1,945
    10-21-2006, 11:07 PM Go to last post
  54. need help ASAP w/ problem.

    20 balloons, 4 white, 4 green, 4 red, 4 blue, 4 yellow. 10 kids; 4 boys and 6 girls. Each kid is to receive 2 balloons. What is the probability that...

    Started by fatguyinalilcoat‎, 10-22-2006 02:20 AM
    • Replies: 0
    • Views: 2,164
    10-22-2006, 02:20 AM Go to last post
  55. Conditionally independent with a Markov chain, please help

    Hi, I have a problem, I try to solve but still get stuck. Can you please read my solution and point out what my wrong points are? Xn is a...

    Started by vijakhara‎, 10-22-2006 04:48 PM
    • Replies: 0
    • Views: 2,610
    10-22-2006, 04:48 PM Go to last post
  56. Binomial Distribution Problem

    I'm at work, so I don't have the problem verbatim, but it's something like this: Suppose that companies who launch products with revenue growth as...

    Started by Merlik‎, 10-23-2006 08:49 AM
    • Replies: 0
    • Views: 3,316
    10-23-2006, 08:49 AM Go to last post
  57. Question Binomialdistribution

    The question is as follows: In a carnival game, a person can win a prize by guessing which one of 5 identical boxes contains the prize. After each...

    Started by glucky‎, 10-24-2006 12:27 PM
    • Replies: 0
    • Views: 5,474
    10-24-2006, 12:27 PM Go to last post
  58. Probability of sequential deaths and dates

    Hi all, I hope today finds you well and in good spirits. I'm trying to develope a statistical model and haven't done so in years. Any help is...

    Started by statistically_challenged‎, 10-27-2006 07:13 AM
    • Replies: 0
    • Views: 4,210
    10-27-2006, 07:13 AM Go to last post
  59. A reversal of the Birthday Problem

    I hope today finds you well and in good spirits. I am trying to develop a model based, in part, on the Classic Birthday Problem. Looking at...

    Started by statistically_challenged‎, 11-05-2006 05:29 PM
    • Replies: 0
    • Views: 3,374
    11-05-2006, 05:29 PM Go to last post
  60. Lognormal distribution

    I dont know where to begin on this one. I need to compute Q=a 50 year flood Q is lognormal distributed given Q= a 50 year flood mu=...

    Started by Naomikreinz‎, 11-13-2006 02:34 AM
    • Replies: 0
    • Views: 3,845
    11-13-2006, 02:34 AM Go to last post

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