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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: 30,213
    09-30-2005, 09:44 AM Go to last post
  1. Var(X+Y+Z)

    What is the formula for the variance of 3 dependent variables? For 2 dependent variables, the formula is Var(X)+Var(Y)+2*Cov(X,Y) What is...

    Started by shrek‎, 07-08-2008 02:20 PM
    • Replies: 6
    • Views: 67,742
    02-09-2015, 02:15 AM Go to last post
  2. Convergence in probability

    If Z_n=\frac{1}{n}\sum_{i=1}^nX_i^2 and W_n=\frac{1}{n}\sum_{i=1}^n(X_i-\bar{X})^2 Show that V_n=Z_n - W_n \rightarrow^p \mu^2 What I think:...

    Started by askazy‎, 12-05-2014 11:21 AM
    • Replies: 6
    • Views: 1,193
    12-05-2014, 04:09 PM Go to last post
  3. Markov Inequality

    If X_1,X_2,X_3...X_{20} are independent random variables with common distribution Poisson(1). Find with markov inequality a upper limit for...

    Started by askazy‎, 12-06-2014 03:00 PM
    • Replies: 6
    • Views: 1,457
    12-06-2014, 04:58 PM Go to last post
  4. Combinations question

    I have a strange question I hope someone can explain it to me or tell me if there is some type of statistical definition for this process im trying...

    Started by ilikepeas‎, 02-10-2015 12:29 AM
    • Replies: 6
    • Views: 1,620
    02-10-2015, 10:09 PM Go to last post
  5. Bernoulli distribution and PGF

    let Yi,j be independent Bernoulli random variables with E = 1/j. Let Zj = sumYi,j for i=1 to j . Let MZj(s) be the probability generating function...

    Started by aytajalli‎, 02-10-2015 06:11 PM
    • Replies: 6
    • Views: 2,321
    02-12-2015, 01:37 PM Go to last post
  6. difference of two independent Poisson random variables

    Why the difference of two independent Poisson random variables doesn't have Poisson distribution? Demonstrate it.

    Started by LIPI‎, 02-10-2015 07:57 PM
    • Replies: 6
    • Views: 4,023
    02-13-2015, 11:50 AM Go to last post
  7. Probability definition

    Hi stats guys, I had a heated discussion about the following situation today: Let’s say I have a function f(x) producing values between 0 and...

    Started by Stats_Newbie‎, 05-22-2015 09:48 AM
    • Replies: 6
    • Views: 1,244
    05-22-2015, 10:40 AM Go to last post
  8. Probability of an accident

    Looking for help with this problem: A train will pass the same point every 7.5 minutes everyday of the week from 4am to 8am. There are 3380...

    Started by JacQue DuBois‎, 07-28-2015 03:29 PM
    • Replies: 6
    • Views: 1,385
    08-01-2015, 12:24 PM Go to last post
  9. Probability of goals in a football match?

    I am trying to work out the probability of teams scoring a goal in a football match. Obviously there are many factors to consider, and the...

    Started by mattadams84‎, 08-23-2015 10:44 AM
    football, goal, probability, statistical analysis
    • Replies: 6
    • Views: 2,562
    08-24-2015, 12:59 PM Go to last post
  10. 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: 1,830
    09-28-2015, 02:25 PM Go to last post
  11. Correlation between data and people

    Hi all, I need your help for this problem. I have to understand the probability to identify the person of a team gives me the product dirtier....

    Started by leomac‎, 10-13-2015 04:56 AM
    • Replies: 6
    • Views: 1,686
    10-21-2015, 06:19 AM Go to last post
  12. expectation of number of streaks

    Ok so i have this question and i dont even knownwhere to begin. An unfair coin with the probability of p to get a head is tossed n times. (n>6). A...

    Started by ogry‎, 12-03-2015 02:36 PM
    • Replies: 6
    • Views: 2,677
    12-04-2015, 11:58 PM Go to last post
  13. Cool Coin and die probability

    If I repeatedly and alternately toss a coin and roll a 6 sided die beginning with the coin what is probability of getting a head before a 6

    Started by Birdkid2‎, 02-14-2016 05:09 PM
    • Replies: 6
    • Views: 1,504
    02-16-2016, 01:38 PM Go to last post
  14. Sampling with replacement - probability problem

    Hi all, (this is my first post, hopefully I am not breaking any rules). I have the following problem that I cannot solve: I have a set of...

    Started by Bep75‎, 04-15-2016 01:06 PM
    • Replies: 6
    • Views: 2,072
    04-17-2016, 03:02 PM Go to last post
  15. Moments of a random variable involving numerous Binomial Distributions

    I am editing my post because it might have been unclear. Suppose X is a random variable involving 4 binomially distributed random variables: X...

    Started by BobbyRichards‎, 05-06-2016 03:42 PM
    binomial distributions, moments
    • Replies: 6
    • Views: 1,368
    05-10-2016, 10:59 AM Go to last post
  16. Question Poisson curve for low lambda

    Hello, I'm quite new to probability and currently trying to understand the different distributions. I see the Poisson curve is weirdly shaped...

    Started by psam‎, 08-12-2016 09:29 AM
    • Replies: 6
    • Views: 1,385
    08-12-2016, 10:32 AM Go to last post
  17. Conditional Probability

    I have some ambiguity in the following problem Three cards are drawn in succession from a deck without replacement. find the probability...

    Started by Roohul Amin‎, 03-29-2017 03:13 PM
    • Replies: 6
    • Views: 2,204
    03-30-2017, 04:11 PM Go to last post
  18. Axioms of probability and sigma additivity

    The third axiom of probability states that given an infinite sequence of mutually exclusive events A1, A2, .... we have P(A1 U A2 U ...) = P(A1) +...

    Started by Weiss‎, 01-27-2017 10:05 PM
    additivity, axiom, measure
    • Replies: 6
    • Views: 4,532
    02-03-2017, 04:06 PM Go to last post
  19. Mom and Daughter Birthdates

    Hi to you all from the UK (Anglesey, Nth Wales) My friend Cathi and her daughter Manon were born on the same date and also the same time (Feb...

    Started by Martin‎, 09-22-2005 01:38 PM
    • Replies: 5
    • Views: 3,148
    05-23-2007, 03:46 PM Go to last post
  20. Talking i hope i make JohnM and quark proud

    :eek: okay i managed to do a bonus question on my "take home test" (which is kinda :) . I just want to see if I did it right and answered it...

    Started by hilarysears77‎, 10-10-2005 05:37 PM
    • Replies: 5
    • Views: 4,640
    10-10-2005, 08:33 PM Go to last post
  21. Question high-low stud

    hey, i got this question given to me in stats and it's just not making any sense in my head. in high-low stud a hand counts as low if it consists...

    Started by wynd90‎, 10-14-2005 12:07 PM
    • Replies: 5
    • Views: 3,394
    10-15-2005, 07:07 PM Go to last post
  22. Question please help...i'm stuck

    Question: There are 8,000 teachers at UCLA. The average age of all the teachers is 24 years with a standard deviation of 9 years. A random sample...

    Started by ecohelp‎, 10-14-2005 02:24 PM
    • Replies: 5
    • Views: 5,393
    10-14-2005, 08:55 PM Go to last post
  23. Unhappy uniform distribution

    A manager of a store reports that the time of a customer on the second floor must wait for the elevator has a uniform distribution ranging from 2 to...

    Started by megs915‎, 10-23-2005 06:43 PM
    • Replies: 5
    • Views: 8,263
    10-24-2005, 12:04 PM Go to last post
  24. candy

    A candy store owner has daily demand Y for a certain brand of candy sold from the bulk bins. Suppose the owner will never stock more than one...

    Started by megs915‎, 10-24-2005 12:05 PM
    • Replies: 5
    • Views: 4,647
    10-25-2005, 04:51 PM Go to last post
  25. Probability

    Hello to everyone... I'm very new to stats and have worked through my assignments but am not sure I'm on the right track. The question is: Two...

    Started by ShannonL‎, 10-24-2005 09:44 PM
    • Replies: 5
    • Views: 4,409
    10-24-2005, 10:36 PM Go to last post
  26. Need help

    Please help me to find how to prove: Cov(aX+b,cY+d)=Cov(X,Y) Thank you in advance mail me rustamna@yahoo.com

    Started by rust‎, 11-05-2005 06:02 AM
    • Replies: 5
    • Views: 3,678
    11-05-2005, 10:13 PM Go to last post
  27. Standard Deviation problem...

    At a motor repair shop, a mechanic can tune-up a car in an average of 30 minutes with a standard deviation of 5 minutes. Assume that the time it...

    Started by Taka‎, 11-02-2005 07:26 AM
    • Replies: 5
    • Views: 4,908
    11-02-2005, 03:01 PM Go to last post
  28. Question statistics help

    Hey this is my first time doing this but I am makeing a b in the elementary statistics class that I am in I need help finding out how to find the...

    Started by amiller2‎, 11-07-2005 06:52 PM
    • Replies: 5
    • Views: 3,097
    11-14-2005, 08:24 PM Go to last post
  29. survey question & conversion to variable

    I'm assuming this question will be an ordinal categorical variable. I added the "other" category since there are lots of methods used for dosing. If...

    Started by kalbright36‎, 01-09-2006 01:45 AM
    • Replies: 5
    • Views: 4,194
    01-10-2006, 11:30 PM Go to last post
  30. Z tables

    Can someone tell me what Z upper and Z lower values are? I am trying to find theoretical parts out of spec. The specifications are -.30 to .30 with...

    Started by cholloway‎, 01-10-2006 10:22 PM
    • Replies: 5
    • Views: 6,673
    01-12-2006, 12:31 PM Go to last post
  31. Help with Prob and Stat question

    I received a homework assignment back that was wrong and I'm not sure how to do the problem. The teacher is ignoring my questions on it. Can someone...

    Started by orangeb‎, 02-07-2006 09:37 PM
    • Replies: 5
    • Views: 2,973
    02-07-2006, 10:18 PM Go to last post
  32. need assistance

    I am taking a course in safety and now have one class left, but ran into a big problem. This class has statistics and I don't have a clue. The text...

    Started by double‎, 03-01-2006 11:35 AM
    • Replies: 5
    • Views: 36,035
    03-05-2006, 06:23 PM Go to last post
  33. Stats assignment totally lost on 1 quesiton.

    Hi Guys I'm new here so Hi to everyone. Anyway I have done the rest of the questions easily but stuck on this one: “Cascade Paint” mixes...

    Started by HiAll‎, 04-05-2006 05:16 AM
    • Replies: 5
    • Views: 2,854
    04-06-2006, 08:07 AM Go to last post
  34. Prob w/Combination of At Least AND Combination

    I'm stuck on this. I've had similar probs, but none that combine the At Least with this type of selection. I really hate to ask for help on a...

    Started by ckbeme‎, 04-21-2006 05:40 PM
    • Replies: 5
    • Views: 10,379
    04-23-2006, 08:38 AM Go to last post
  35. probability problem

    Good Afternoon! I'm really glad I found this site, because I have thought myself into a corner! I am a Grade 8 and 9 science teacher and have...

    Started by michellebelliveau‎, 04-27-2006 01:00 PM
    • Replies: 5
    • Views: 2,863
    05-01-2006, 12:24 PM Go to last post
  36. Angry Please help!

    Hello, I recently started a statistics class and I'm really struggling with it. I feel so dumb. I read the assigned chapters and they make...

    Started by half-life‎, 05-14-2006 08:34 PM
    • Replies: 5
    • Views: 2,658
    05-14-2006, 09:50 PM Go to last post
  37. sounds like a simple probability question

    Hope someone can help me. A store has 6 TV graphic magazines and 8 Newstime magazines on the counter. If two customers purchased a magazine, find...

    Started by koss123‎, 07-18-2006 01:00 PM
    • Replies: 5
    • Views: 3,082
    08-14-2006, 09:05 AM Go to last post
  38. circular permutation

    Hello: I have a probability problem I would like some takes on, please. "There are 5 boys and 3 girls sitting around a circular table. What is...

    Started by galactus‎, 08-10-2006 10:29 AM
    • Replies: 5
    • Views: 4,381
    08-17-2006, 09:41 AM Go to last post
  39. Easy probability question, but I am clueless

    Hello, I am an MBA Student taking a Business Stat class and I am really struggling with probability. I can enter the information into the...

    Started by Need Stat Help, Stat!‎, 08-28-2006 01:07 PM
    • Replies: 5
    • Views: 2,692
    09-04-2006, 06:28 PM Go to last post
  40. Binomial Model?

    Hello, Would appreciate any help with the following question.. A shoe store's records show that 30% of customers making a purchase use a credit...

    Started by nat9‎, 09-03-2006 02:42 AM
    • Replies: 5
    • Views: 2,610
    09-05-2006, 08:35 AM Go to last post
  41. Expectation Value

    Could somebody explain logically how does: E(aY + b) = aE(Y) + b given Y is continuous and a & b are constants.

    Started by structstat‎, 09-09-2006 07:36 PM
    • Replies: 5
    • Views: 3,502
    09-10-2006, 01:13 AM Go to last post
  42. Verification needed

    Hi there, was just wondering if someone could verify if the following is correct? Thankyou Is the number of newspapers sold per month a...

    Started by nat9‎, 10-13-2006 11:35 PM
    • Replies: 5
    • Views: 2,304
    10-18-2006, 11:47 PM Go to last post
  43. i am confusing myself, pls help

    I have some simple probability questions but i am confusing myself. 1.) players roll 2 dice, each with 6-equally like sides. If you were to roll...

    Started by jojo‎, 10-22-2006 03:48 PM
    • Replies: 5
    • Views: 3,175
    10-23-2006, 09:33 AM Go to last post
  44. continous random variables

    I need to find 1. the probability when X is less than or equal to 5. Given the following:- f(x) is 0.3 when x=0 0.014 when 0 is...

    Started by Naomikreinz‎, 10-30-2006 03:44 PM
    • Replies: 5
    • Views: 2,474
    11-10-2006, 05:06 PM Go to last post
  45. Poisson and a Moment-Generating Function

    I have a problem that provides for the moment-generating function of a Poisson random variable, X, as M(t) = e^(mu(e^t - 1)). Then I must find the...

    Started by jaknowlden‎, 11-06-2006 07:54 PM
    • Replies: 5
    • Views: 3,929
    11-08-2006, 08:57 PM Go to last post
  46. confidence interval for variance

    The provincial sales tax (pst) rate vary from province to province. Six of the rates are shown below. 5% 7% 8% 7% 9% 6% Compute a 95% confidence...

    Started by sweetx‎, 11-10-2006 11:52 PM
    • Replies: 5
    • Views: 2,510
    11-15-2006, 09:48 AM Go to last post
  47. Probability Question

    Hello there!!! I wonder if anyone familiar with the probability theory can help me to clarify the following. There is trading system which...

    Started by zealot‎, 11-26-2006 02:39 PM
    • Replies: 5
    • Views: 2,735
    11-27-2006, 01:20 AM Go to last post
  48. Probability problem and 2 others

    Ok I have 3 problems and I cant figure them out :mad: its driving me crazy. 1. The number of calls coming into a PBX follows a Poisson process...

    Started by durrett syndrome‎, 04-17-2007 04:03 PM
    • Replies: 5
    • Views: 5,499
    04-19-2007, 05:31 PM Go to last post
  49. Smile Conditional Probability [HELP]

    I = innocent, G= guilty P(I) = 1, P(G) = 0 Conditional Probability Test Results: P(+ | I ) =0, P(+ | G ) = 1 Find P(G | +) in other words...

    Started by cheri3‎, 09-07-2007 07:41 PM
    • Replies: 5
    • Views: 2,530
    09-11-2007, 06:02 PM Go to last post
  50. Probability of hitting a certain number

    Random numbers between 5 and 18 are continually added to increase a sum, starting at zero, what is the probability that you will hit the number 72?

    Started by cid902‎, 10-21-2007 12:22 AM
    • Replies: 5
    • Views: 2,413
    10-21-2007, 09:55 PM Go to last post
  51. i need help with normal distribution please

    i can't answer this example...can anyone help me asap please.. The diameter of the dot produced by a printer is normally distributed with a mean...

    Started by zerofreeze‎, 01-18-2008 02:49 AM
    • Replies: 5
    • Views: 6,809
    01-18-2008, 03:59 PM Go to last post
  52. Tossing a coin

    Hi everybody and sorry about my English I’ve a simple question and it seems typical but please before answering it thinks carefully because it is...

    Started by Protein‎, 02-17-2008 05:04 AM
    • Replies: 5
    • Views: 2,931
    02-17-2008, 10:50 AM Go to last post
  53. Significance testing with probabilities of 100 percent

    Hi, I have a question that I am beginning to believe may not even make sense mathematically, as I have tried to google it for hours with no luck:...

    Started by gearl42‎, 02-20-2008 04:11 PM
    • Replies: 5
    • Views: 3,136
    02-24-2008, 01:09 PM Go to last post
  54. Probability with Normal model.

    According to the NHS, heights of adults may have a normal model with mean heights of 69.1" for men and 64.0" for women. The respective standard...

    Started by Patriot4913‎, 02-22-2008 12:10 AM
    • Replies: 5
    • Views: 2,463
    02-22-2008, 08:34 PM Go to last post
  55. Easy problem, unsure on terminology

    According to infoplease, 18.8% of the luxury cars manufactured in 2003 were silver. A large dealership typically sells 50 luxury cars a month. Let...

    Started by Patriot4913‎, 02-22-2008 12:19 AM
    • Replies: 5
    • Views: 3,311
    02-22-2008, 08:35 PM Go to last post
  56. Need help getting started on some problems

    I have a worksheet here over my entire semester in stats and some of the problems are from very early in the semester and I can't find a way to even...

    Started by Drew‎, 05-22-2008 12:25 PM
    • Replies: 5
    • Views: 3,848
    05-22-2008, 01:23 PM Go to last post
  57. Moment generating function?

    I need help solving what appears to be a fairly simple problem. Find the moment generating function of : fx(x)=xe^-x Can anyone help me get...

    Started by jer4011‎, 03-12-2008 09:22 PM
    • Replies: 5
    • Views: 3,738
    03-13-2008, 04:44 PM Go to last post
  58. Probability distribution (NEED HELP BIG TIME)

    ========================================================= *PLEASE DON'T simply write the answer, I NEED STEP BY STEP, on how to do it...

    Started by uni-student‎, 04-10-2008 08:03 PM
    • Replies: 5
    • Views: 2,314
    04-11-2008, 09:15 AM Go to last post
  59. Finding Dist. Function in the form Y= aX+b

    Hi There, I havent actually attempted this question yet, but if anybody can provide me with a guide to answering it I'd be really greatful. Let X...

    Started by woody198403‎, 05-09-2008 02:36 AM
    • Replies: 5
    • Views: 8,556
    05-14-2008, 06:33 AM Go to last post
  60. Arrow Probability

    Let A and B be constants such that A < B. Let z be a standard normal random variable. For what values of A does P(A<z<B)approximately equal P(z<B)?...

    Started by encircleme‎, 05-09-2008 11:08 PM
    • Replies: 5
    • Views: 2,490
    05-10-2008, 03:18 PM Go to last post

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