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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: 30,311
    09-30-2005, 09:44 AM Go to last post
  1. Another binomial problem....tell me if I'm heading in the right direction

    38% of people in the US have type A+ blood. If you randomly select 5 Americans & ask them their blood type, what is the probability that exactly 3...

    Started by disgurl‎, 06-17-2009 11:35 AM
    • Replies: 3
    • Views: 2,150
    06-17-2009, 11:54 AM Go to last post
  2. Binomial random variable question

    I have this question that is driving me batty & I cannot figure it out. I'm taking entry level stats online & have driven to the campus a few times...

    Started by disgurl‎, 06-16-2009 11:26 AM
    • Replies: 5
    • Views: 5,358
    06-16-2009, 09:34 PM Go to last post
  3. Question Tell me if I'm setting this up correctly please

    30% of hospital admissions for diabetic patients are r/t problems w/kidneys. In a sample of 10 diabetic hospital admissions, what is the probability...

    Started by disgurl‎, 06-16-2009 12:20 PM
    • Replies: 1
    • Views: 2,301
    06-16-2009, 01:24 PM Go to last post
  4. Probability That The Number of Successes in Two Series Will Be Equal

    Ok, I have one more question. In some ways it is similar to my first question, but in others it is infinitely more complex. You have two data...

    Started by heavyarms553‎, 06-15-2009 05:51 PM
    • Replies: 1
    • Views: 2,167
    06-16-2009, 02:32 AM Go to last post
  5. Smile probability with reguards to quality control

    I am taking an online class to beginner statistics. I need help with what equation to use for this question. The Quality control inspector...

    Started by SHL‎, 06-15-2009 03:04 PM
    • Replies: 0
    • Views: 2,342
    06-15-2009, 03:04 PM Go to last post
  6. Conditional Proabability - Please Help!!!

    Hello, let X, Y, Z be 3 random variables. how to express the conditional probability P in terms of P and P?

    Started by vladisland‎, 06-15-2009 09:26 AM
    • Replies: 0
    • Views: 2,287
    06-15-2009, 09:26 AM Go to last post
  7. Poisson. Calculate expected frequency problem.

    I've decided to brush up on my statistics recently by jumping right in the middle of it, and I landed on the normal distribution. I have this...

    Started by Cronos‎, 06-12-2009 07:06 AM
    • Replies: 4
    • Views: 10,350
    06-15-2009, 09:07 AM Go to last post
  8. question of Poisson distribution

    hi, I have problem in assignment, I really need to understand and I will solve it any direction for the solution will be appreciate it.:( ...

    Started by logical‎, 06-13-2009 03:56 PM
    • Replies: 2
    • Views: 2,980
    06-13-2009, 05:17 PM Go to last post
  9. Statistical calculators

    Do you know a good site with direct and inverse calculator to the Normal and Student's distribution? Thanks. Alicia.

    Started by leonsotelo‎, 06-12-2009 02:08 PM
    • Replies: 1
    • Views: 1,982
    06-12-2009, 09:20 PM Go to last post
  10. Probability Functions - Need Help

    I need help with a question that involves Calculus. I've been out of school for 12 years and now have jumped back into a stat class with a some...

    Started by schnakees‎, 06-11-2009 01:04 PM
    • Replies: 5
    • Views: 2,176
    06-11-2009, 10:33 PM Go to last post
  11. A little help please?

    This is the final question from my homework and I have been laboring over it for over an hour without much luck. "A certain type of seed has a...

    Started by schnakees‎, 06-11-2009 09:31 AM
    • Replies: 1
    • Views: 1,766
    06-11-2009, 10:28 AM Go to last post
  12. Adjusted odd ratio interpretation

    Hi There, I have a question regarding adjusted ODD RATIO interpretation I am trying to interpret a table of results of logistic regression...

    Started by alessandra‎, 06-11-2009 05:47 AM
    • Replies: 1
    • Views: 8,690
    06-11-2009, 08:09 AM Go to last post
  13. Question help me in assignment plz

    A Professor has taught statistics for 41 years and has kept the scores of every test he has ever given. Every test has been worth 100 points. He is...

    Started by kashif87‎, 06-11-2009 05:09 AM
    • Replies: 2
    • Views: 3,171
    06-11-2009, 06:02 AM Go to last post
  14. PDF/CDF of population proportion when sampling without replacement?

    Hi Apologies if this is mathematically trivial, but I'm trying to find the probability density function and cumulative distribution function of...

    Started by simshef‎, 06-10-2009 08:20 AM
    • Replies: 2
    • Views: 4,344
    06-10-2009, 11:21 AM Go to last post
  15. Chi-Square Test

    Hi guys, Was hoping that someone can help me with a Chi-Square test I'm attemtping. I understand the mechanics of the test and how to...

    Started by jpkoch74‎, 06-08-2009 05:48 AM
    • Replies: 9
    • Views: 4,992
    06-09-2009, 07:23 AM Go to last post
  16. integral of probability density function

    Hi, I apologize for the almost certainly stupid question. I'm sure somebody must have asked it before but I have searched and cannot find an...

    Started by mockle‎, 06-08-2009 02:12 PM
    • Replies: 2
    • Views: 5,669
    06-08-2009, 04:00 PM Go to last post
  17. Probability Question

    hi, this is a problem i'm working on which confuses me a bit. In a particular city, airport A handles 50% of all airline traffic, and airports B...

    Started by yon‎, 06-04-2009 03:32 PM
    • Replies: 1
    • Views: 3,695
    06-04-2009, 11:22 PM Go to last post
  18. expected value short question

    Hi there, I have a short question, thought it was an easy one (still think it is) but I got confused. C~Exp(mean=4) X~Exp(mean=3) Y= ...

    Started by leo nidas‎, 05-06-2009 09:23 AM
    • Replies: 1
    • Views: 2,770
    06-04-2009, 03:27 AM Go to last post
  19. density function

    hi, i'm working on a problem that goes like: A fire-detection device uses two temperature-sensitive cells (cell A and cell B) acting independent...

    Started by yon‎, 06-03-2009 07:39 PM
    • Replies: 3
    • Views: 4,105
    06-04-2009, 03:25 AM Go to last post
  20. Simple problem

    Hey there, I have a question that probably has a simple answer. It's about coin flipping. If you flip a (normal) coin 10 ten times, and it...

    Started by djarvis‎, 04-21-2009 09:33 AM
    2 Pages
    1 2
    • Replies: 24
    • Views: 7,980
    06-02-2009, 11:20 AM Go to last post
  21. Joint density function and conditional distribution

    Need help for my assignment question. I just can't get the answer for this question after hours of trying. Given the joint density function ...

    Started by blueycool‎, 06-01-2009 01:00 AM
    • Replies: 2
    • Views: 7,011
    06-01-2009, 01:58 AM Go to last post
  22. discrete variable measurement

    hello, just wondering if you could help me with a problem. I am trying to find a way of measurement to differentiate between the following...

    Started by jamborta‎, 05-31-2009 05:15 PM
    • Replies: 0
    • Views: 2,576
    05-31-2009, 05:15 PM Go to last post
  23. Question Plz help me in creatin p.d

    Consider the population of eight students whose ages are given in the table. Let X denote the age of a randomly selected student. 18 22 22 18 ...

    Started by kashif87‎, 05-28-2009 08:35 AM
    • Replies: 1
    • Views: 2,348
    05-28-2009, 12:06 PM Go to last post
  24. question in generating random numbers

    Hi, I have question regarding Linear Congruential Method the cycle occurs when same sequence of numbers repeated. in one of problems I solved,...

    Started by logical‎, 05-28-2009 06:30 AM
    • Replies: 2
    • Views: 2,639
    05-28-2009, 10:40 AM Go to last post
  25. Expected values, MGF

    I got a couple of exercise questions that a little help would be appreciated. 1.Suppose X and Y discrete RV with following joint PF: Y/X...

    Started by blacksuede‎, 05-27-2009 04:46 AM
    • Replies: 3
    • Views: 3,087
    05-27-2009, 11:27 PM Go to last post
  26. Normal Probability Distribution

    1. A variable is normally distributed with a standard deviation of 9.3. (a) If a probability of a value being less than 23 is to be set at 0.13,...

    Started by rockyroad23‎, 05-26-2009 07:34 PM
    • Replies: 1
    • Views: 2,891
    05-27-2009, 12:01 AM Go to last post
  27. Adding squares of dependent random variables

    Hi there, I hope someone in this forum can help me with this problem: I am creating a scalar test statistic from a time series of a vector r(t)=...

    Started by Eisenschneider‎, 05-25-2009 10:08 AM
    • Replies: 2
    • Views: 2,734
    05-26-2009, 01:15 AM Go to last post
  28. Binary string probability question

    Hi, I'm having trouble figuring out this question. I am quite new to probability at this point. Q: How many binary strings of length 2n have...

    Started by delive‎, 05-24-2009 04:21 PM
    • Replies: 1
    • Views: 3,442
    05-25-2009, 06:08 AM Go to last post
  29. homework help please

    I don't know how to solve this problem Assume that 20 percent of the 60,000 welfare recipientsin a state were addicted to drugs. Adrug test is...

    Started by umf‎, 05-19-2009 10:06 PM
    • Replies: 0
    • Views: 2,112
    05-19-2009, 10:06 PM Go to last post
  30. Help with probability question.

    Hello everyone, I am doing a revision for my university statistics exam and I've run into a question I don't how to approach. The question...

    Started by sigg‎, 05-19-2009 03:38 PM
    • Replies: 0
    • Views: 1,960
    05-19-2009, 03:38 PM Go to last post
  31. uniform distribution

    Assume that the weight loss for the first month of a diet program varies between 6 pounds and 12 pounds, and is spread evenly over the range of...

    Started by jewsvideo‎, 05-14-2009 05:09 AM
    • Replies: 0
    • Views: 5,527
    05-14-2009, 05:09 AM Go to last post
  32. random probability

    Answer the question, considering an event to be "unusual" if its probability is less than or equal to 0.05. Assume that one student in your class...

    Started by jewsvideo‎, 05-14-2009 04:56 AM
    • Replies: 0
    • Views: 6,249
    05-14-2009, 04:56 AM Go to last post
  33. binomial distribuion problem

    Estimate the indicted probability by using the normal distribution as an approximation to the binomial distribution. In one county, the conviction...

    Started by jewsvideo‎, 05-14-2009 04:53 AM
    • Replies: 0
    • Views: 4,576
    05-14-2009, 04:53 AM Go to last post
  34. Validity of setting constant to zero

    Can anyone tell me the validity of setting the constant term to zero to make the other coefficients pass significance? I have been sent a multiple...

    Started by craigpollard‎, 05-07-2009 03:56 PM
    • Replies: 3
    • Views: 8,377
    05-13-2009, 05:32 PM Go to last post
  35. Probabilities that are neither disjoint nor independent

    Question solved through further independent research; thread may be deleted.

    Started by jda‎, 05-13-2009 10:32 AM
    • Replies: 0
    • Views: 3,520
    05-13-2009, 10:32 AM Go to last post
  36. Expected values of bivariate distribution

    Hi guy's, To calculate Eor E of a bivariate pdf fXY(xy) Do you treat them seperately ie to calculate E E= \int x f(x,y)dx or to calculate...

    Started by beatle‎, 05-09-2009 04:16 PM
    • Replies: 2
    • Views: 6,055
    05-10-2009, 03:58 PM Go to last post
  37. 6 digits number

    we want to create a 6 digits number from the digits 1-5, and to keep the condition that each of the 5 digits, appear at least once. what is the...

    Started by WeeG‎, 05-10-2009 08:54 AM
    • Replies: 0
    • Views: 2,185
    05-10-2009, 08:54 AM Go to last post
  38. Problem involving Random Variables

    Hi there. I'm trying to solve this question since yesterday, but I simply can't get the correct answer. Can someone please help me? Here goes the...

    Started by Toru‎, 05-07-2009 08:52 PM
    • Replies: 2
    • Views: 2,341
    05-09-2009, 02:24 PM Go to last post
  39. Proof of Acceptance Rejection random number generator

    Hi, I have attached a pdf file showing my understanding of how to show that the acceptance rejection method random number generator draws from the...

    Started by PeterVincent‎, 05-09-2009 10:43 AM
    • Replies: 0
    • Views: 3,731
    05-09-2009, 10:43 AM Go to last post
  40. Probability integral transformation

    Hey I've got a probably simple question concerning time series analysis but I don't know what I should do::( I did a in-sample estimation of...

    Started by riddy‎, 05-09-2009 08:58 AM
    • Replies: 0
    • Views: 4,529
    05-09-2009, 08:58 AM Go to last post
  41. Need help on stat, I will compensate

    hey guys, I need some tutoring before my stat final next week, the topics include: Inventory models (service levels, quantity discounts,...

    Started by CSUkkidd‎, 05-09-2009 01:23 AM
    • Replies: 0
    • Views: 2,543
    05-09-2009, 01:23 AM Go to last post
  42. How to determine data has Poisson Distribution

    Hi there Can some one suggest me how i can determine data has poisson distribution? Actually i want to analyze the relationship between these...

    Started by Mandeep‎, 05-08-2009 10:52 PM
    • Replies: 0
    • Views: 4,385
    05-08-2009, 10:52 PM Go to last post
  43. quick and simple answer for hypothesis testing please

    what I did so far: mean = 430.066 standard deviation = 257.672 n = 30 X^2 = /o^2 = /300^2 = 21.394 ignore the numbers, I can solve everything...

    Started by jd254‎, 05-07-2009 03:02 PM
    • Replies: 0
    • Views: 2,772
    05-07-2009, 03:02 PM Go to last post
  44. Measuring product ratings

    I have a list of products that have been evaluated by humans in a 3rd party blind study. The products were measured on a scale of 0 - 5 stars. ...

    Started by petrovitch‎, 05-07-2009 11:23 AM
    • Replies: 0
    • Views: 2,174
    05-07-2009, 11:23 AM Go to last post
  45. homework help: how do I solve this without standard deviation? hypothesis testing

    Q7. Law enforcement officers in a city have claimed that over 40% of all robberies committed by those who have a history of drug abuse and/or alcohol...

    Started by jd254‎, 05-07-2009 06:48 AM
    • Replies: 0
    • Views: 6,489
    05-07-2009, 06:48 AM Go to last post
  46. probability homework help PLEASE just a point in direction. no answer needed.

    Q4. In a Gallup poll, 47% of the eligible women responding said that they would date a coworker. Suppose 350 employed women were selected at random....

    Started by jd254‎, 05-07-2009 03:31 AM
    • Replies: 7
    • Views: 3,745
    05-07-2009, 06:03 AM Go to last post
  47. Normal distribution question...help

    Please help. Heres the question http://i43.tinypic.com/2w3t836.jpg I tried (a) and got answer: 46.49% Also (b) and got 0.532m. Both are right....

    Started by pg123‎, 05-07-2009 05:05 AM
    • Replies: 0
    • Views: 2,255
    05-07-2009, 05:05 AM Go to last post
  48. binomial distribution help

    hey i just need some help with this question: im confused about the formula. find sigma and mu A)the probability distribution of the # of tails...

    Started by skyblue‎, 05-06-2009 09:27 PM
    • Replies: 1
    • Views: 3,781
    05-06-2009, 11:51 PM Go to last post
  49. For complex questions an easy answer

    So I am not gonna ponder you guys with stupid basic stat questions, I would love to but I have a final tomorrow, and I would love if you guys can...

    Started by ijoeputamo‎, 05-06-2009 11:45 AM
    • Replies: 0
    • Views: 2,460
    05-06-2009, 11:45 AM Go to last post
  50. no spade or diamonds when randomly drawing 5 cards homework help

    Suppose a five-card poker hand was randomly drawn from a well-shuffled standard deck of 52 cards. a) What is the probability that the hand...

    Started by jd254‎, 05-06-2009 05:31 AM
    • Replies: 0
    • Views: 2,322
    05-06-2009, 05:31 AM Go to last post
  51. Poisson Distribution Question Help

    Hey ppl, Hope u guys can help me with this Q plz. An insurance company is reassessing the risk of flooding. From past records it has...

    Started by JJC‎, 05-04-2009 07:28 PM
    • Replies: 0
    • Views: 2,092
    05-04-2009, 07:28 PM Go to last post
  52. die probability

    Two fair dices are thrown and you are told that the sum of upturned face is equal to 7.what is the probabilty that neither face os equal to 6??is it...

    Started by andysim1983‎, 05-04-2009 05:55 AM
    • Replies: 0
    • Views: 1,897
    05-04-2009, 05:55 AM Go to last post
  53. Poisson

    What is bigger and why : P(X>=1), or P(X>=2 | X>=1 ) thanks !

    Started by WeeG‎, 05-03-2009 02:22 AM
    • Replies: 3
    • Views: 2,622
    05-03-2009, 05:08 AM Go to last post
  54. Negative Binomial ?

    A box contains 5 electric devices, 2 of them are damaged. We check them randomly each one at a time, until we find out which ones are damaged....

    Started by WeeG‎, 05-03-2009 02:21 AM
    • Replies: 0
    • Views: 2,641
    05-03-2009, 02:21 AM Go to last post
  55. Expected Value Question

    Is the expected value of a parabola the y coordinate of it's maximum or minimum multiplied by the x value at that point?

    Started by margolmm‎, 05-01-2009 07:34 PM
    • Replies: 0
    • Views: 2,748
    05-01-2009, 07:34 PM Go to last post
  56. Non-linear function of M i.i.d. r.v.

    Hi, I have a hard time with the following problem: I consider a population of M r.v. a_i, i.i.d. I need to study the following r.v. eta defined as...

    Started by acozza‎, 04-29-2009 06:38 AM
    • Replies: 3
    • Views: 2,641
    04-30-2009, 05:33 AM Go to last post
  57. Trying to predict a trend

    The chart below displays what percentage of bankruptcies are filed each year, by region, due to medical costs. If I'm trying to predict how many...

    Started by cornfused squared‎, 04-28-2009 02:40 PM
    • Replies: 1
    • Views: 3,477
    04-28-2009, 09:06 PM Go to last post
  58. Question Standard Normal Distribution Chart

    Hey guys, first post on the site for me Just wondering how I would go about presenting the probability of a z score from my chart if the z score i...

    Started by whytness‎, 04-27-2009 08:56 AM
    • Replies: 2
    • Views: 2,958
    04-28-2009, 01:28 AM Go to last post
  59. Possibly a proportions question?

    So here's the question, my questions about the quesion and what i did. A professor at a local community college noted that the grades of his...

    Started by tososon‎, 04-27-2009 08:32 PM
    • Replies: 2
    • Views: 3,554
    04-28-2009, 01:05 AM Go to last post
  60. Unhappy A problem about poisson process

    Hi all, I have a question about the poisson process. Below is the queston: Consider each transition of the poisson process as an event, for...

    Started by Laiton‎, 04-26-2009 04:56 PM
    • Replies: 0
    • Views: 2,438
    04-26-2009, 04:56 PM Go to last post

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