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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: 30,339
    09-30-2005, 09:44 AM Go to last post
  1. Round-Off errors

    Problem: A set of n numbers are to be added together, and before they are added, each number is rounded off to the nearest integer, thus introducing...

    Started by statsrocks‎, 04-05-2008 04:38 PM
    • Replies: 0
    • Views: 3,753
    04-05-2008, 04:38 PM Go to last post
  2. Poisson process

    Men, women and children make purchases at a counter in a shop according to independent Poisson processes with rates 10, 12 and 4 purchases per hour...

    Started by statsrocks‎, 04-05-2008 02:02 PM
    • Replies: 0
    • Views: 2,375
    04-05-2008, 02:02 PM Go to last post
  3. continuous RV & probability Distributions

    :) hi all i m asking for a help actualy i realy didnt understand how does continuous random variable function can anyone pls explain me this or just...

    Started by kia‎, 04-01-2008 03:49 AM
    • Replies: 0
    • Views: 2,725
    04-01-2008, 03:49 AM Go to last post
  4. Normal distribution?

    i think this is a normal distribution problem. The distribution of sales for a factory has mean 20,000 units per month with a standard deviation...

    Started by el1‎, 03-31-2008 09:11 PM
    • Replies: 0
    • Views: 1,919
    03-31-2008, 09:11 PM Go to last post
  5. Probability and Sampling Distribution Question

    Just before a city referendum on a school budget, a local newspaper polls 400 voters in an attempt to predict whether the budget will pass. Suppose...

    Started by deron.washington‎, 03-25-2008 10:38 PM
    • Replies: 2
    • Views: 5,744
    03-31-2008, 06:36 PM Go to last post
  6. Freeman-Tukey transformation

    Hi everyone. I am pooling proportions for meta-analysis. As part of this project I have been exploring variance stabilizing transformations for...

    Started by PPDoc‎, 03-31-2008 12:12 AM
    • Replies: 0
    • Views: 8,046
    03-31-2008, 12:12 AM Go to last post
  7. 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: 6,489
    03-30-2008, 10:38 PM Go to last post
  8. Which formula?

    If a question has given me the mean and standard deviation , what formula should i use?

    Started by el1‎, 03-30-2008 10:36 PM
    • Replies: 0
    • Views: 3,459
    03-30-2008, 10:36 PM Go to last post
  9. Need help with this problem asap

    1. The average number of calls received by a switchboard in a 30-minute period is 15. What is the probability that between 10:00 and 10:30 the...

    Started by brigog‎, 03-30-2008 08:44 PM
    • Replies: 0
    • Views: 4,531
    03-30-2008, 08:44 PM Go to last post
  10. Poisson Problem

    Can anyone help me with this question?: It is known that the number of persons entering the intensive care unit at a city hospital averages 5 per...

    Started by Stitch‎, 03-27-2008 10:36 PM
    • Replies: 0
    • Views: 2,386
    03-27-2008, 10:36 PM Go to last post
  11. Is this multinomial distribution? Help.

    Suppose the random variables X, Y, and Z have the following joint probability distribution. Table below: x y z f(x,y,z) 1 1 1 0.05 1 1...

    Started by kyeong‎, 03-26-2008 11:33 PM
    • Replies: 1
    • Views: 3,761
    03-27-2008, 09:15 AM Go to last post
  12. HELP! using continuity correction factor

    Hi, I have been having issues with this question: An airline company knows that 8% of its passengers will not show up for their flight. A plane...

    Started by katherine1‎, 02-15-2008 03:51 PM
    • Replies: 4
    • Views: 7,305
    03-26-2008, 08:26 AM Go to last post
  13. normal distribution problem

    I'm in intro. stats. Help please. Question is: Test scores normally distributed with mean=68.2 and standard deviation=10.4. Estimate probability...

    Started by stgolf‎, 03-22-2008 03:18 PM
    • Replies: 0
    • Views: 4,150
    03-22-2008, 03:18 PM Go to last post
  14. Discrete Density

    Let X and Y be independent random variables assumed to be uniformly distributed on {0, 1/2, 1, 2} and { 1/2, 2, 4}, respectively. (a) What is the...

    Started by Stat_help‎, 03-19-2008 08:35 PM
    • Replies: 1
    • Views: 2,520
    03-22-2008, 01:56 AM Go to last post
  15. New to Stats

    Trying to figure out which type of probability distribution to use on this problem. 48 new cars are shipped to local dealerships. 12 of these have...

    Started by Trip‎, 03-19-2008 04:44 PM
    • Replies: 2
    • Views: 2,254
    03-20-2008, 07:55 PM Go to last post
  16. Bayes' Theorem

    Hi guys, I was hoping somebody might be able to help me with this question. The information I am given: Gamma1 = the risk of disease for...

    Started by abc123‎, 03-20-2008 07:34 AM
    • Replies: 0
    • Views: 2,649
    03-20-2008, 07:34 AM Go to last post
  17. Weibull problem

    Hi all, I have this question on weibull but was not taught weibull in class. The text book didnt offer much weibull examples or solutions as well....

    Started by helloall‎, 03-19-2008 09:31 AM
    • Replies: 1
    • Views: 2,716
    03-19-2008, 03:51 PM Go to last post
  18. Need help on problem BIG TIME!

    Each trading day the value of a particular stock goes up one unit with probability 0.3, stays the same with probability 0.5 or else goes down one...

    Started by JoeyStorm‎, 03-18-2008 02:29 AM
    • Replies: 14
    • Views: 3,562
    03-18-2008, 11:16 PM Go to last post
  19. Poisson distribution and p-value

    Does anyone know how to find a general p-value for the poisson distribution. All I have is the expected number of occurrences, given by the poisson...

    Started by Raynor5000‎, 03-18-2008 01:09 PM
    • Replies: 0
    • Views: 7,318
    03-18-2008, 01:09 PM Go to last post
  20. Need Help on Prob

    You are given three coins and told that two of them are biased and that they both have a 60% chance of coming up heads. The third coin is fair. You...

    Started by BaineHallow‎, 03-18-2008 12:59 AM
    • Replies: 2
    • Views: 2,714
    03-18-2008, 09:09 AM Go to last post
  21. Help On Probablity Immediatly

    For a particular brand of popcorn in an air popper, the average number of kernels that fail to pop is 6.8 per cup. a.) Find the probability that 5...

    Started by jensen02431‎, 03-13-2008 11:39 AM
    • Replies: 1
    • Views: 2,450
    03-17-2008, 09:20 PM Go to last post
  22. Drawing chips out of a hat Question?

    There is 1 blue chip and 5 white chips in a hat. The person drawing the blue chip is the designated driver for the night. No one wants to pick the...

    Started by Dwayne‎, 03-16-2008 09:44 AM
    • Replies: 1
    • Views: 3,375
    03-17-2008, 08:57 PM Go to last post
  23. New stats

    Hi, new to this thread. I need some help with a stats problem that I recevied in my class. A soft drink bottling company maintains records...

    Started by Upandcoming‎, 03-16-2008 08:47 PM
    • Replies: 0
    • Views: 1,911
    03-16-2008, 08:47 PM Go to last post
  24. Markov chain

    hi I'm struggling with this question: (Genetics) Two animals are mated. From their offspring, two are selected and they are mated...

    Started by 1cookie‎, 03-15-2008 11:41 AM
    • Replies: 0
    • Views: 3,148
    03-15-2008, 11:41 AM Go to last post
  25. Problem Solving Help

    Having trouble solving these problems not sure where to begin, anything will help. I have the answers not sure how to get them. -Suppose you...

    Started by lilsan1014‎, 03-13-2008 10:37 PM
    • Replies: 0
    • Views: 2,276
    03-13-2008, 10:37 PM Go to last post
  26. 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: 3,763
    03-13-2008, 04:44 PM Go to last post
  27. two independent data in normal distribution

    Hello, Suppose we have normal distribution of measured data. We know what the standard deviation is for the whole distribution precisely from an...

    Started by veracity‎, 03-13-2008 02:07 AM
    • Replies: 0
    • Views: 2,582
    03-13-2008, 02:07 AM Go to last post
  28. Probability Question Needed to be Answered

    A youth group has eight boys and six girls. If a state of four officers is selected, find the probability that... a.) Three are girls? b.) Two...

    Started by jensen02431‎, 03-11-2008 11:19 AM
    • Replies: 1
    • Views: 5,657
    03-11-2008, 05:49 PM Go to last post
  29. Normal Distribution Questions Needed to Answered

    Find the area under the normal distribution curve. a.) Above z=1.34 b.) Above z=-1.34 c.) Between z=2.05 and z=1.34

    Started by jensen02431‎, 03-11-2008 11:25 AM
    • Replies: 1
    • Views: 3,239
    03-11-2008, 03:22 PM Go to last post
  30. Z Scores Probabilty...Can anyone help?

    Hey, Here is the question, I need some serious help!!!! A soft drink machine can be regulated so that it discharges and average of per cup. If...

    Started by spoochie1‎, 03-03-2008 08:18 PM
    • Replies: 4
    • Views: 2,155
    03-10-2008, 08:51 AM Go to last post
  31. sample space

    ok, so in this question, there are 6 people, 2 out of 6 can win the prize in the raffle. People: a,b,c,d,e,f and here is the sample space:...

    Started by salsa9417‎, 03-06-2008 02:36 AM
    • Replies: 8
    • Views: 3,353
    03-09-2008, 08:00 PM Go to last post
  32. not a clue

    oi oi, hows it all going there is this thing in stats that i do not understand, dunno what it is called but hopefully someone might help if they...

    Started by whereszorro‎, 03-09-2008 12:35 PM
    • Replies: 2
    • Views: 3,115
    03-09-2008, 05:34 PM Go to last post
  33. Red face Statistical probability

    Hello, I am writing a research paper and have a stats question. It is simple enough. Here is the instrument I am developing. And I...

    Started by Odisey‎, 03-09-2008 02:53 PM
    • Replies: 0
    • Views: 1,829
    03-09-2008, 02:53 PM Go to last post
  34. Unhappy Loat at Chapter six

    Hi there everyone. My name is Katie and i'm algebraeiclly challenged lol. Okay so i thought i understood what was happening up until i got to chapter...

    Started by kateykatez‎, 03-07-2008 12:09 PM
    • Replies: 0
    • Views: 2,491
    03-07-2008, 12:09 PM Go to last post
  35. 4th Super Bowl Victory

    When the NY Giants won Super Bowl XLII it was their 3rd Super Bowl victory AND it was also the third time that I created a NY Giants billboard in...

    Started by 3for3‎, 03-05-2008 02:06 PM
    • Replies: 0
    • Views: 2,245
    03-05-2008, 02:06 PM Go to last post
  36. 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: 6,519
    03-05-2008, 01:37 PM Go to last post
  37. Homework help

    Hi, I don't think this question is designed to be particularly difficult but I'm having trouble with it anyway: A ship arrives at a certain...

    Started by finger1011‎, 03-05-2008 01:03 PM
    • Replies: 2
    • Views: 3,122
    03-05-2008, 01:16 PM Go to last post
  38. Probability Question

    I have a short paper due on probability. Here's the info: First, we assume that Alex Rodriguez has four at bats and that the at bats are...

    Started by delilah86‎, 03-04-2008 08:33 PM
    • Replies: 0
    • Views: 1,906
    03-04-2008, 08:33 PM Go to last post
  39. probability question

    how do i find the mean and standard deviation? Let the random variable x represent the number of girls in a family of three children. I...

    Started by Dewdrop731‎, 03-04-2008 07:46 PM
    • Replies: 0
    • Views: 1,646
    03-04-2008, 07:46 PM Go to last post
  40. Variance of Zero

    If you have a variance of zero, will the probability be 100%, 50% or "cannot be determined"? Thanks!

    Started by Chessie‎, 03-04-2008 02:02 PM
    • Replies: 2
    • Views: 2,862
    03-04-2008, 03:49 PM Go to last post
  41. A Two Class Probability Problem

    This is a problem that has been bothering me for a while. Say you have 10 'things' and each thing can either be of class A or class B (mutually...

    Started by jensph‎, 03-04-2008 03:25 PM
    • Replies: 0
    • Views: 2,241
    03-04-2008, 03:25 PM Go to last post
  42. Homework Question

    Okay, so I have this question for homework and I really don't know what its asking me...if anyone can put it in layman terms for me I'd be really...

    Started by betticat‎, 03-04-2008 12:08 PM
    • Replies: 1
    • Views: 3,737
    03-04-2008, 12:27 PM Go to last post
  43. Some questions on Hypothesis, poissson and normal dist...try it

    Question 1 Millions of suburban commuters are finding railroads to be a convenient, time-saving, less stressful alternative to the automobile. While...

    Started by Shekhar‎, 10-22-2007 06:45 AM
    • Replies: 4
    • Views: 4,087
    03-03-2008, 01:53 PM Go to last post
  44. Please help?

    this is the class of test scores of 31 students in a stat class. a) find the mean, median, standard deviation,shape of distribution(symmetric,skewed...

    Started by stat help‎, 03-02-2008 10:14 PM
    • Replies: 0
    • Views: 2,004
    03-02-2008, 10:14 PM Go to last post
  45. standard normal random variables

    I'm stumped on this question: Let Z1, Z2, Z3 be independent standard normal variables identify the distributions of a) (1/2)*(Z1-Z2)^2 b)...

    Started by themattler‎, 03-02-2008 09:04 PM
    • Replies: 0
    • Views: 2,502
    03-02-2008, 09:04 PM Go to last post
  46. Lightbulb Expected Number of Coin Flips

    A coin having probability p of landing heads is flipped 5 times and then flipped utill the pattern of the first 5 flips is observed again for the...

    Started by mmehdi‎, 03-02-2008 12:50 AM
    • Replies: 0
    • Views: 2,672
    03-02-2008, 12:50 AM Go to last post
  47. Unhappy would some one confirm my answers

    1-Many universities require a student to take a math placement test as well as computer science placement test.80% of the students who take both...

    Started by stat help‎, 02-29-2008 08:37 PM
    • Replies: 2
    • Views: 2,097
    03-01-2008, 05:06 PM Go to last post
  48. Need Expert Help: A Blackjack probability question

    Hello everyone, If someone wants to take a shot at figuring out the house/player edge in the following two situations, I would really appreciate...

    Started by ejwalden‎, 03-01-2008 04:40 PM
    • Replies: 0
    • Views: 2,286
    03-01-2008, 04:40 PM Go to last post
  49. Second opinion?

    Ok, this problem looks simple, which is why I am wondering if maybe I have missed something? "Here's an interesting one, not hard but shows how...

    Started by Savvy‎, 02-29-2008 07:46 PM
    • Replies: 1
    • Views: 2,099
    03-01-2008, 03:45 PM Go to last post
  50. Unhappy i need help with my homework please help!!!!

    Here are the questions: 1-5% of the items produced by a machine are defective.of the defective items produced by the machine,70% have minor defectes...

    Started by stat help‎, 02-29-2008 06:43 PM
    • Replies: 2
    • Views: 2,801
    02-29-2008, 07:53 PM Go to last post
  51. Joint pdf problem

    A manufacturer has designed a process to produce pipes that are 10 feet long. The distribution of the pipe length, however, is actually Uniform on...

    Started by eenu‎, 02-28-2008 02:00 AM
    • Replies: 0
    • Views: 3,950
    02-28-2008, 02:00 AM Go to last post
  52. Question Help with these two questions, please? I am confused!

    Hello Everyone, These are part of my unit on Binomial and Poisson distributions: 1) The average number of phone inquiries per day at the center...

    Started by fitnesskitty‎, 02-27-2008 02:17 PM
    • Replies: 7
    • Views: 2,552
    02-27-2008, 09:27 PM Go to last post
  53. Help please! I can't seem to make sense of these!

    A test consists of 10 true/false questions. To pass the test a student must answer at least 6 questions correctly. If a student guesses on each...

    Started by LES‎, 02-27-2008 03:53 PM
    • Replies: 1
    • Views: 4,275
    02-27-2008, 04:34 PM Go to last post
  54. Success by chance?

    I have a problem where participants had to discriminate two objects, and success was defined was getting 9 correct in a 10 trial run - meaning that...

    Started by meglovestulips‎, 02-21-2008 10:48 AM
    • Replies: 10
    • Views: 3,755
    02-27-2008, 11:27 AM Go to last post
  55. Real Roots??

    :eek: I have no idea where to start on this one If a is uniformly distributed over , what is the probability that the roots of the equation...

    Started by trbbls‎, 02-26-2008 08:56 PM
    • Replies: 0
    • Views: 3,021
    02-26-2008, 08:56 PM Go to last post
  56. sealed bid problem

    Your company is making a sealed bid for a construction project. If your firm has the lowest bid, you will pay another firm (a subcontractor) 140...

    Started by trbbls‎, 02-26-2008 03:15 PM
    • Replies: 1
    • Views: 4,393
    02-26-2008, 05:27 PM Go to last post
  57. Batting Average & Probability

    A softball team's first 4 hitters are Sam (batting average .500), Gina (batting average .400), Tom (batting average .737), and Kerry (batting average...

    Started by smileysara2008‎, 02-26-2008 01:40 PM
    • Replies: 1
    • Views: 5,319
    02-26-2008, 01:43 PM Go to last post
  58. Standard deviations and profits?

    So this is another question I attempted to solve but was stuck on the 2nd part of it: A store knows that the number of pies sold each day varies...

    Started by probablyme‎, 02-25-2008 02:52 AM
    • Replies: 1
    • Views: 5,855
    02-25-2008, 01:16 PM Go to last post
  59. help

    I can not figure this problem out! I don't think there is enough info, but there is an answer in the back: 0.271 The problem: Using Composite...

    Started by KobeLove08‎, 02-24-2008 11:00 PM
    • Replies: 2
    • Views: 5,276
    02-25-2008, 01:09 PM Go to last post
  60. I think I got it, but then... (A DRINKING GAME!)

    400 accidents on a Saturday night were analyzed: Number of vehicles involved & whether alcohol played a role in the accident. The numbers are in the...

    Started by probablyme‎, 02-24-2008 04:10 PM
    • Replies: 3
    • Views: 3,196
    02-25-2008, 03:19 AM Go to last post

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