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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: 30,353
    09-30-2005, 09:44 AM Go to last post
  1. Need help please.

    A recent study indicaed that 82% of US households speak English at home. If 4 households are randomlu selected then.... a. What is the...

    Started by lost822‎, 11-14-2005 06:51 PM
    • Replies: 2
    • Views: 3,011
    11-14-2005, 08:32 PM Go to last post
  2. probability

    ok and also to my last question: The 1 in 1000. So would I take 1/1000=.001 then take .001 * 52 (because people make an avg of 52 purchase/yr.)...

    Started by jaben‎, 11-15-2005 11:48 AM
    • Replies: 2
    • Views: 3,095
    11-15-2005, 12:08 PM Go to last post
  3. Please Help-binomial probability distribution, etc

    Wish I'd found your site a long time ago! I have been working on this all day long with no success and I don't know what to do. I am to...

    Started by SusanZ‎, 11-13-2005 07:31 PM
    • Replies: 2
    • Views: 5,282
    11-15-2005, 12:10 PM Go to last post
  4. Question Probability

    Ok I am very new to stats and am very confused. I went to the examples board and now am even more confused. Here is the problem. Ok they offer a...

    Started by jaben‎, 11-15-2005 11:35 AM
    • Replies: 13
    • Views: 5,906
    11-15-2005, 03:11 PM Go to last post
  5. Need lots of help - Binomial Probabilities

    I completely confused on this my problem is this: Richard has just been given a 10 question multiple-choice quiz in his history class. Each...

    Started by CheriHagans‎, 11-16-2005 10:18 PM
    • Replies: 2
    • Views: 13,320
    11-16-2005, 10:29 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: 23,468
    11-17-2005, 12:25 PM Go to last post
  7. need help with set-up

    Give the joint density f(x,y)= 60xy^2 if 0<x<y<1 and 0 otherwise, find P(X+Y<1). I just need help setting up the integral...I don't know what to...

    Started by megs915‎, 11-20-2005 01:44 PM
    • Replies: 1
    • Views: 4,384
    11-20-2005, 06:31 PM Go to last post
  8. Unhappy problem with all laws...

    I have to pass a test on-line, but I really don't get it. I need to pass it at least 3 times without mistakes (knowing it does change every time i...

    Started by caora‎, 11-21-2005 02:07 PM
    • Replies: 3
    • Views: 4,758
    11-22-2005, 03:47 PM Go to last post
  9. Unhappy expectation of sums of random variables

    Hi I am having trouble solving a homework problem. It says: N people arrive separately to a profeesional dinner. Upon arrival each person looks...

    Started by wheatone‎, 11-22-2005 10:21 PM
    • Replies: 1
    • Views: 6,853
    11-23-2005, 11:59 AM Go to last post
  10. Central Limit Theory?

    Hi everyone! Here's my problem: In a large population, 12.5% of all individuals have diabetes. (a) Seven of these individuals are sampled at...

    Started by abyss‎, 11-28-2005 07:44 PM
    • Replies: 7
    • Views: 3,896
    11-28-2005, 11:35 PM Go to last post
  11. Question Uniform Distribution/Probability Density Function

    I'm experiencing a mental block with this concept. If anyone could help me out, I'd be most appreciative. I understand the formula for the...

    Started by ambiguous325‎, 11-29-2005 02:00 PM
    • Replies: 3
    • Views: 9,941
    11-29-2005, 09:29 PM Go to last post
  12. Probability of intersection

    Hello, Does anyone know if the probability of intersection of A and B can be BIGGER than the multiplication of the probability of A with the...

    Started by Roni‎, 11-30-2005 04:29 AM
    • Replies: 1
    • Views: 6,139
    11-30-2005, 09:13 AM Go to last post
  13. probability

    This is a part of a problem. I decided to ask it here after hours of trying to solve it... Two tennis players make a match composed of 5 sets....

    Started by demolay‎, 11-25-2005 12:34 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 7,550
    11-30-2005, 04:49 PM Go to last post
  14. Unhappy Help!

    I'm working on this problem and I am completely lost. There there anyone out there that can help me. I see the problem worked out in the book, but...

    Started by Stacy Jones‎, 12-02-2005 01:18 PM
    • Replies: 4
    • Views: 3,584
    12-02-2005, 03:49 PM Go to last post
  15. Help with normal distribution! (please!)

    Hi, I'm looking through some past papers for an exam I have this weekend and have come across this strange binomial distribution question, that's...

    Started by StevenX‎, 12-06-2005 11:27 AM
    • Replies: 4
    • Views: 3,622
    12-06-2005, 03:00 PM Go to last post
  16. Probability question (league related)

    I have a question that I figured I post to see some other people opinions. I'm part of a sport where there are multiple individual leagues of 12...

    Started by dak11‎, 12-08-2005 02:46 PM
    • Replies: 1
    • Views: 2,936
    12-08-2005, 03:26 PM Go to last post
  17. Question please help me out!

    I'm having problem with binomial and poisson distribution. please help me out.

    Started by bapex4real‎, 12-09-2005 09:21 AM
    • Replies: 1
    • Views: 2,465
    12-09-2005, 09:30 AM Go to last post
  18. Probability question

    Here is the problem: To get to work, a commuter must cross train tracks. The time the train arrives varies slightly from day to day , but the...

    Started by AlexKom‎, 12-13-2005 09:09 PM
    • Replies: 4
    • Views: 9,639
    12-15-2005, 11:13 AM Go to last post
  19. Stats help Please!!!!

    This problem is driving me crazy! The length of time to complete a door assembly on an automobile factory assembly line is normally distributed...

    Started by becca3848‎, 12-16-2005 06:55 PM
    • Replies: 7
    • Views: 17,764
    12-18-2005, 01:56 PM Go to last post
  20. Probability

    The IRS says it will audit about 20 percent of all tax returns next year. What are the odds in favor of your being audited? I cant find the...

    Started by summertigger‎, 12-18-2005 08:34 PM
    • Replies: 1
    • Views: 2,950
    12-18-2005, 08:54 PM Go to last post
  21. Continious random variable- Uniform.

    I'm having trouble with some questions. Problem 1. If we have a continious random variable X that is uniformly distributed on the interval...

    Started by Michelle‎, 12-18-2005 07:49 PM
    • Replies: 7
    • Views: 4,001
    12-18-2005, 09:14 PM Go to last post
  22. Probability

    HEllo! I have a trouble with probabilities and I need your help... The probability of an event is 2/10, which means 1/5 = .2 What is the...

    Started by AlexKom‎, 12-21-2005 10:22 PM
    • Replies: 3
    • Views: 2,549
    12-21-2005, 10:37 PM Go to last post
  23. hi a problem of probability.

    There are 3 bag. there are 5 white and 5 black balls in 1st bag. In the 2nd 4 white and 8 black. in the 3rd8 white n 6 black. A ball is selected...

    Started by bundho‎, 12-22-2005 04:44 AM
    • Replies: 1
    • Views: 2,349
    12-22-2005, 09:35 AM Go to last post
  24. Question Probability help

    In a poll of married couples, about 79 percent of the men and 55 percent of the women were employed outside the home. In 39 percent of the couples,...

    Started by summertigger‎, 12-18-2005 09:08 PM
    • Replies: 3
    • Views: 2,806
    12-23-2005, 04:42 PM Go to last post
  25. Question finding non-randomness in binomial successes?

    Hi, I've only had one semester of Stats, so this is probably a real newbie question. I'm having problems on deciding how to approach a specific...

    Started by amarkb‎, 01-02-2006 03:10 PM
    • Replies: 7
    • Views: 3,304
    01-04-2006, 08:04 AM Go to last post
  26. Probability Problem

    Hi, Here is the problem: Roll a die twice: What is the probability of observing exactly one 5? I think that the answer is 5/36: P(5)=1/6; P(5...

    Started by AlexKom‎, 01-04-2006 06:16 PM
    • Replies: 2
    • Views: 3,200
    01-05-2006, 07:59 AM Go to last post
  27. Unhappy Calculating z value/mean and standard deviation

    Hi...have completed my assignment (and have come a long way with some helpful tips on this forum) but am stuck on one problem: In grading apples...

    Started by ShannonL‎, 11-05-2005 11:25 PM
    • Replies: 11
    • Views: 42,693
    01-07-2006, 10:22 PM Go to last post
  28. Probabilty problem for a Stock Market System

    Hi, I have a Probabilty problem for a Stock Market System. Assume I have backtested a system over say 1,000 historical trades. It wins say 40%...

    Started by pfpurcell‎, 01-05-2006 04:29 PM
    • Replies: 8
    • Views: 4,379
    01-09-2006, 09:59 AM Go to last post
  29. Help with Probability formual choosing

    Just need to know if answer/formual is correct. Aand B equally likely to occur. The Chance that either A or B happens on a given trial of an...

    Started by klewis‎, 01-08-2006 04:32 PM
    • Replies: 3
    • Views: 2,860
    01-09-2006, 10:31 AM Go to last post
  30. Probability question

    get confused :confused: 100 poker hands are dealt from separate well-shuffled decks.The random variable H is the number of hands with at least one...

    Started by rabbit‎, 01-08-2006 06:18 PM
    • Replies: 3
    • Views: 3,499
    01-09-2006, 10:49 PM Go to last post
  31. 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: 4,237
    01-10-2006, 11:30 PM Go to last post
  32. 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: 6,717
    01-12-2006, 12:31 PM Go to last post
  33. Unhappy Probability Problem help

    Hey I need help with this problem...I really don't understand how to do Prob. Two number cubes were rolled 100 times. Based on the resul;ts below,...

    Started by whit_wha‎, 01-12-2006 04:53 PM
    • Replies: 1
    • Views: 3,101
    01-12-2006, 05:39 PM Go to last post
  34. Question Lost and need Help

    I'm not sure which board this fits into so I posted in both, Sorry! I need assistance on the following problem (I'll state it and then state my...

    Started by missycl‎, 01-12-2006 07:07 PM
    • Replies: 1
    • Views: 3,161
    01-12-2006, 07:33 PM Go to last post
  35. Unhappy Need Help Again!!!

    The manager of an Apple dealership keeps records on customers visiting the store. Records show that 40% of people visiting the store are female. ...

    Started by klewis‎, 01-11-2006 05:06 PM
    • Replies: 2
    • Views: 2,299
    01-13-2006, 12:43 PM Go to last post
  36. Independent study help..

    Greetings, I am new here and am in the middle of completing a research project for a Business Policy class. I put my Statistics independent class...

    Started by pwoodruffe‎, 01-19-2006 05:29 PM
    • Replies: 3
    • Views: 6,191
    01-20-2006, 11:38 AM Go to last post
  37. Special Dice

    Here is the problem: Two players compete against each other by rolling dice- not the traditional dice ,though. One face of Alphonso's die has an 8...

    Started by AlexKom‎, 01-22-2006 10:03 PM
    • Replies: 2
    • Views: 7,185
    01-23-2006, 05:41 AM Go to last post
  38. Help

    Hello, Here is the problem: "Assume the heights of high school basketball players are normally distributed. For boys the mean is 74 inches with...

    Started by AlexKom‎, 01-22-2006 09:02 PM
    • Replies: 2
    • Views: 4,820
    01-23-2006, 05:49 AM Go to last post
  39. Probabilty question

    Hi guys just wondering if what I'm doing is correct or not. Any help would be much appreciated. Heres the question: A die is weighted to that...

    Started by mariomaths‎, 01-23-2006 12:42 PM
    • Replies: 1
    • Views: 3,257
    01-23-2006, 01:03 PM Go to last post
  40. Binomial probability

    Hi, I have the following problem. We are comparing two screening methods in one population. With method A we took 63 samples and 13 were...

    Started by Karr‎, 01-24-2006 11:01 AM
    • Replies: 2
    • Views: 3,080
    01-25-2006, 07:30 AM Go to last post
  41. Angry how do I do it?

    Statistics is not my strength so I hope you can explain this in really easy terms! I don't even understand what this question wants me to do, let...

    Started by karen c‎, 01-25-2006 11:35 AM
    • Replies: 3
    • Views: 6,708
    01-25-2006, 11:22 PM Go to last post
  42. Conditional Probability

    Hey I'm sorry this problem is kind of long, but I really cannot figure it out. The advantage of your experimental blood test is that 95% of the...

    Started by johndoe‎, 01-27-2006 06:13 PM
    • Replies: 2
    • Views: 3,714
    01-30-2006, 08:35 PM Go to last post
  43. PDF and Mean

    I have a couple of question here I can't figure out. Does anyone know how to prove these? And can you explain why? Find the probability density...

    Started by congers@yoeric.com‎, 01-31-2006 10:57 AM
    • Replies: 1
    • Views: 2,446
    01-31-2006, 11:22 PM Go to last post
  44. Mixed Poisson Distribution

    Since the question contains many mathematical symbols, it's in an image file attached at the bottom. What I don't get is the integral part. Why...

    Started by macro90‎, 01-24-2006 03:36 AM
    • Replies: 1
    • Views: 3,494
    01-31-2006, 11:26 PM Go to last post
  45. Pizza toppings problem

    Ok - first, let me state the questions, then what I did. Suppose that a pizza shop offers ten different toppings for its pizzas, and you select...

    Started by panz‎, 01-30-2006 12:45 PM
    • Replies: 3
    • Views: 8,632
    02-01-2006, 11:43 AM Go to last post
  46. Football Problem

    2001 NCAA Poll Will Big 10 or Pac 10 have a team in the Rose Bowl? 13,429 respondents 2961 said Big 10 4494 said Pac 10 6823 said neither ...

    Started by Parillamaster‎, 01-31-2006 02:26 PM
    • Replies: 2
    • Views: 2,891
    02-02-2006, 10:27 AM Go to last post
  47. US Naval Academy - Annapolis Question

    I am old (over 40). The last math type class I took was 23 years ago at Purdue (MA 153), intro to algebra and trig. I am having a tough time...

    Started by Parillamaster‎, 02-02-2006 10:26 AM
    • Replies: 3
    • Views: 4,984
    02-02-2006, 02:16 PM Go to last post
  48. probability question help

    I need help with this question: A computer company receives large shipments of microprocessors. It must ensure that the proportion of them that are...

    Started by bighippo‎, 02-02-2006 02:23 PM
    • Replies: 1
    • Views: 2,622
    02-02-2006, 03:31 PM Go to last post
  49. Question Facing A Manufacturing Shut Down

    OK. Last question for the day. I have completed three others on my own. I am stuck on this one. A purchasing agent placed rush orders with...

    Started by Parillamaster‎, 02-02-2006 04:14 PM
    • Replies: 3
    • Views: 2,467
    02-02-2006, 04:35 PM Go to last post
  50. Probability/Normal Distribution Table

    Just want to check that I am on the right track: Find the probablility that "a" is greater than 0% mean = 13.4% standard deviation = 20% Z =...

    Started by MissNJ‎, 02-02-2006 11:41 PM
    • Replies: 2
    • Views: 3,882
    02-02-2006, 11:56 PM Go to last post
  51. Newbie needs cheating probability

    Hello, I am hoping someone could shed some light on the following problem; I sure hope I explain it well enough. Student A and B are both...

    Started by jworth94‎, 02-02-2006 10:15 PM
    • Replies: 7
    • Views: 3,083
    02-04-2006, 09:02 PM Go to last post
  52. Guidance please

    Need guidance. 2 machines, each produce half of the total garments Probability that an irregular garment will come from machine 1 is 0.05...

    Started by MissNJ‎, 02-04-2006 08:55 PM
    • Replies: 6
    • Views: 3,646
    02-04-2006, 10:05 PM Go to last post
  53. Unhappy help with probability questions

    HELPPPPPPPPPPPPPPPPPPPPPPPPPP I am struggling with a introductory stats course, and am in need of some free help on some of my questions plse plse...

    Started by stressed with stats‎, 02-01-2006 11:51 PM
    • Replies: 10
    • Views: 6,976
    02-05-2006, 10:12 AM Go to last post
  54. Talking contingency table

    I am trying to build a contingency table but am confused. Here is the data I have: Probability that machine 1 will produce an irregular garment is...

    Started by MissNJ‎, 02-05-2006 05:35 PM
    • Replies: 3
    • Views: 3,771
    02-06-2006, 12:59 PM Go to last post
  55. Exclamation probability help

    While visiting a daycare center, you estimate the ratio of toddlers to infants as 3:2. If the center has an enrollment of 25 children about how many...

    Started by jessi‎, 02-06-2006 10:27 PM
    • Replies: 1
    • Views: 2,625
    02-06-2006, 10:32 PM Go to last post
  56. Exclamation sampling probabitlity

    400 students were surveyed one week prior to the election for student body president regarding their choice of three candidates. The table below...

    Started by jessi‎, 02-06-2006 10:36 PM
    • Replies: 1
    • Views: 2,808
    02-06-2006, 10:47 PM Go to last post
  57. 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: 2,991
    02-07-2006, 10:18 PM Go to last post
  58. Is my thinking correct?

    I actually figured this one out ( it took 15 minutes, which is good for me) but need to clarify the answer as the text does not provide it! The...

    Started by karen c‎, 02-07-2006 11:35 PM
    • Replies: 2
    • Views: 2,709
    02-07-2006, 11:47 PM Go to last post
  59. Am I on the right track for this one?

    The height of people in a certain population is approx. normally distributed with a mean of 67 inches and a standard deviation of 3.4 inches....

    Started by karen c‎, 02-07-2006 11:56 PM
    • Replies: 4
    • Views: 2,743
    02-08-2006, 12:59 AM Go to last post
  60. More questions from the Math Challenged

    Here are more questions that I am lost on if anyone cares to tackle. If possible I would like to know the steps to the answer also, not just the...

    Started by orangeb‎, 02-08-2006 07:48 AM
    • Replies: 1
    • Views: 3,026
    02-08-2006, 01:30 PM Go to last post

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