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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: 30,228
    09-30-2005, 09:44 AM Go to last post
  1. I Need Help!!

    Does anyone have any basic probability hints? I have a stats test tomorrow on probability, and am confused! I understand the basics, but getting into...

    Started by milkyway4679‎, 11-15-2006 08:18 PM
    • Replies: 0
    • Views: 2,610
    11-15-2006, 08:18 PM Go to last post
  2. Probability ?

    Assume that each year the IRS randomly audits 10% of the tax returns. If a married couple has filed seperate returns, a. what is the prob that both...

    Started by KmClark84‎, 11-13-2006 10:23 PM
    • Replies: 1
    • Views: 4,732
    11-15-2006, 06:01 PM Go to last post
  3. Talking Help Please

    hello I really need some help.. I have a test tomorrow and Im still a little confused. MNM Corp. gives each of its employees an aptitude test. The...

    Started by KmClark84‎, 11-13-2006 06:29 PM
    • Replies: 1
    • Views: 2,424
    11-15-2006, 05:48 PM Go to last post
  4. 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: 2,514
    11-15-2006, 09:48 AM Go to last post
  5. Probability question

    I worked this out but am not confident i did it correctly. Could some one check it, and if not... please direct me. Im trying to grasp this.. ...

    Started by mrsjar‎, 11-11-2006 09:05 PM
    • Replies: 3
    • Views: 3,199
    11-13-2006, 05:42 PM Go to last post
  6. Probability I am stuck - help please!

    Here's the question: The New York Times reported that 45 percent of the households in Manhattan District 5 participated in recycling. If 20...

    Started by Isis‎, 11-13-2006 08:52 AM
    • Replies: 2
    • Views: 3,300
    11-13-2006, 01:59 PM Go to last post
  7. question about probability

    Imagine that I have a bag filled with 200 milions of small balls of different colors (each color has the same number of balls). Furthermore, a ball...

    Started by faustino‎, 11-08-2006 09:29 AM
    • Replies: 4
    • Views: 2,825
    11-13-2006, 06:42 AM Go to last post
  8. Baye's Theorem

    Hi, I have two questions that I am struggling with, that concern the Baye's Theorem.... 1) Mr. Smith's gardener is not dependable; the probability...

    Started by Eulia‎, 11-12-2006 04:16 PM
    • Replies: 1
    • Views: 6,402
    11-13-2006, 05:01 AM Go to last post
  9. 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: 3,809
    11-13-2006, 02:34 AM Go to last post
  10. Help needed!! fast!

    Hey guys, new to the forum. I've had this question and I'm so stuck on it. I'm not to good with probability so any feedback would be very helpful. ...

    Started by Escalade‎, 11-12-2006 09:32 PM
    • Replies: 1
    • Views: 2,663
    11-13-2006, 01:42 AM Go to last post
  11. probability question

    for the total population of a large southern city, mean family income is $34,000, with a standard deviation (for the population) of $5,000. a....

    Started by kermie5184‎, 11-09-2006 10:06 AM
    • Replies: 1
    • Views: 3,697
    11-11-2006, 11:31 AM Go to last post
  12. Probability/Density Curve Question

    Quality control plan B calls for rejecting a battery as defective if its weight falls more than 2 standard deviations below the specified mean. ...

    Started by littlebreen‎, 11-09-2006 07:07 PM
    • Replies: 1
    • Views: 3,132
    11-11-2006, 02:33 AM Go to last post
  13. Expectance and Variance of Mixed Distributions

    Hi, How do I get the expectance and variance of mixed variables. I can't seem to get a good exampe on this.

    Started by Naomikreinz‎, 11-10-2006 05:16 PM
    • Replies: 1
    • Views: 9,815
    11-11-2006, 02:11 AM Go to last post
  14. 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: 2,475
    11-10-2006, 05:06 PM Go to last post
  15. Can you get me started?

    A television store owner figures that 45% of the customers entering the store will purchase an ordinary television set, 15% will purchase a plasma...

    Started by teacher2be‎, 11-06-2006 08:34 PM
    • Replies: 7
    • Views: 5,759
    11-09-2006, 07:39 AM Go to last post
  16. 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: 3,933
    11-08-2006, 08:57 PM Go to last post
  17. Question Probability Question

    I just handed in a test and I'm wondering if I used the correct formula for the following problem; the problem stated (this is not verbatim), a...

    Started by LynnLicorish‎, 11-01-2006 12:09 PM
    • Replies: 7
    • Views: 2,458
    11-07-2006, 08:42 AM Go to last post
  18. Probability Problem

    Hello, I'm having a problem with this question. In how many different ways can 6 girls and 5 boys stand in a row when all the boys have to stand...

    Started by Pilky‎, 11-06-2006 05:45 PM
    • Replies: 1
    • Views: 2,084
    11-06-2006, 06:51 PM Go to last post
  19. CDF question

    It is proposed to model the annual salaries X (in $) paid to people in a particular occupation using the continuous cumulative distribution function:...

    Started by capo_mo‎, 11-03-2006 03:18 AM
    • Replies: 2
    • Views: 2,097
    11-06-2006, 05:49 PM Go to last post
  20. weibull distribution

    How could weibull random variables be generated from a uniform random numbers generator?

    Started by brunett1‎, 10-24-2006 06:00 PM
    • Replies: 1
    • Views: 3,334
    11-05-2006, 08:40 PM Go to last post
  21. 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: 3,272
    11-05-2006, 05:29 PM Go to last post
  22. Lottery Probability

    Having a really tough time with this one. Six different winning numbers are selected at random from, 1 to 37. A player also selects six...

    Started by checkeredshawn‎, 11-04-2006 12:42 AM
    • Replies: 2
    • Views: 3,093
    11-04-2006, 01:30 PM Go to last post
  23. probability / level of significance

    I dont know how to start these probs. I will be posting 3 questions. My book says level of confidence. Is this the same as level of significance. Pls...

    Started by sweetx‎, 11-02-2006 09:19 PM
    • Replies: 2
    • Views: 3,162
    11-04-2006, 11:15 AM Go to last post
  24. standard deviation / level of significance.

    In the manufacturing process of a particular painkiller, a machine is regulated to dispense 32 mg of caffeine per tablet. The machine will need...

    Started by sweetx‎, 11-02-2006 09:24 PM
    • Replies: 2
    • Views: 4,950
    11-04-2006, 11:14 AM Go to last post
  25. Question Probability Question

    Hi, I have two questions that I'm currently struggling with, the first one states that there are 40 red balls, 40 green balls, and 20 blue balls....

    Started by Megan‎, 11-03-2006 07:54 PM
    • Replies: 1
    • Views: 5,065
    11-04-2006, 08:27 AM Go to last post
  26. level of significance- pls help

    I dont know how to start. any help would be wonderful. The table below shows the composite grade of 300 students in a statistics course, and how...

    Started by sweetx‎, 11-02-2006 09:22 PM
    • Replies: 2
    • Views: 3,562
    11-03-2006, 09:58 AM Go to last post
  27. Probability help

    I'm unsure of how to set up these types of problems.... help will be very appreciated, thanks in advance.... A carton of 24 light bulbs includes...

    Started by Eulia‎, 11-03-2006 06:27 AM
    • Replies: 2
    • Views: 2,997
    11-03-2006, 09:48 AM Go to last post
  28. Standard Deviation problem

    This is probably laughably easy, but I am doing this problem on a practice exam, and I keep getting it wrong. Question: The waiting time at a...

    Started by Westen‎, 11-02-2006 08:43 PM
    • Replies: 1
    • Views: 2,694
    11-03-2006, 09:23 AM Go to last post
  29. probability

    Hello all, I'm taking my first and final Statistics course (thankfully for me!) in college and I need a little bit of help on this one: ...

    Started by sherbert‎, 11-01-2006 01:23 PM
    • Replies: 3
    • Views: 3,173
    11-02-2006, 09:33 AM Go to last post
  30. probability confusion

    Hello everyone!!! I don't know if im experiencing a brain-fart these days, but I just can't figure this out. Here's a problem. I have more like...

    Started by speth‎, 10-27-2006 11:54 AM
    • Replies: 4
    • Views: 4,661
    10-31-2006, 10:34 PM Go to last post
  31. Permutations with Duplicates

    I have been trying to find information about calculating permutations that include multiple duplicate items, but have only found programming source...

    Started by Peelman‎, 10-18-2006 03:38 AM
    • Replies: 10
    • Views: 22,045
    10-30-2006, 03:34 PM Go to last post
  32. Question A problem for the statistically inclined

    On the desk, you have 40 envelopes. Each contain a cash prize (unknown until opened): 5 - contain $10,000 6 - contain $5,000 9 - contain $1,000...

    Started by ChrisDoyle‎, 10-24-2006 07:39 PM
    • Replies: 3
    • Views: 2,952
    10-30-2006, 03:23 PM Go to last post
  33. how to find joint probability distribution of 3 variables

    I am stuck in a problem. we have a red balls, b blue balls and c white balls. We are choosing n balls without replacement. How to find joint...

    Started by brunett1‎, 10-24-2006 11:31 PM
    • Replies: 2
    • Views: 9,157
    10-27-2006, 09:59 PM Go to last post
  34. 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: 4,181
    10-27-2006, 07:13 AM Go to last post
  35. Exponential Distribution

    I am in a 400 level Probabilities/Stats class at my university and am stuck on a problem relating to exponential distribution. I will list the...

    Started by jaknowlden‎, 10-24-2006 08:40 PM
    • Replies: 7
    • Views: 9,878
    10-26-2006, 07:53 PM Go to last post
  36. Joint probability distribution functions

    So a joint pdf is of the form P(X,Y) = SS f(x,y) dx dy, where 'S' is the integral symbol. I've got to cook up the pdf for f(x,y), where X and Y...

    Started by Aegis‎, 10-23-2006 11:24 PM
    • Replies: 3
    • Views: 10,335
    10-25-2006, 07:34 PM Go to last post
  37. 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: 5,453
    10-24-2006, 12:27 PM Go to last post
  38. Solving Complex Equation with Variable Factorials and Exponents

    The Problem: A very important 20-bit message is being sent via satellite, and there is a 5% probability that any single bit will be received...

    Started by nickcherryjiggz‎, 10-23-2006 09:59 PM
    • Replies: 1
    • Views: 4,242
    10-24-2006, 11:15 AM Go to last post
  39. Smile Little help please.

    Hello I;m a little confused here this is the problem. Judge red Cartolano Disposed cases: 3037 Appealed: 137 Reversed: 12 A=appealed...

    Started by laton123‎, 10-23-2006 02:44 PM
    • Replies: 3
    • Views: 3,207
    10-24-2006, 06:51 AM Go to last post
  40. Need Help For My Test Tommorow

    barry bonds of the san francisco giants had the highest batting average in the 2002 major league baseball season. his average was .370. so assume the...

    Started by piro829‎, 10-24-2006 01:36 AM
    • Replies: 3
    • Views: 2,533
    10-24-2006, 06:49 AM Go to last post
  41. reallyneedhelpwithexpectedvalues

    I was wondering if anyone could help with the following: Magazine has 1,620,000 subscribers 640,000 - women 980,00 - men 30% OF WOMEN read...

    Started by glucky‎, 10-23-2006 06:12 PM
    • Replies: 3
    • Views: 4,708
    10-23-2006, 11:27 PM Go to last post
  42. 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: 3,180
    10-23-2006, 09:33 AM Go to last post
  43. Problem Solving

    1) If both sexes are equally likely at birth, what is the probability that exactly 3 of 5 children will be girls? 2) About 8% of all rental cars...

    Started by xo_caroline_xo‎, 10-22-2006 11:49 AM
    • Replies: 1
    • Views: 2,547
    10-23-2006, 09:24 AM Go to last post
  44. simple coin flip problem

    hi, I recently discovered this forum and I think this could help me with my stats courses... I havent received the text book yet, so my first...

    Started by Logman‎, 09-30-2006 11:52 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 11,242
    10-23-2006, 09:09 AM Go to last post
  45. 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: 3,305
    10-23-2006, 08:49 AM Go to last post
  46. Is this rectangular ?

    Consider the following rectangular distribution f(x) = 2 , 0 < x < 1/2 = 0 , elsewhere. Please suggest whether this is a geuine...

    Started by vinayan‎, 10-19-2006 09:33 AM
    • Replies: 2
    • Views: 1,942
    10-23-2006, 08:21 AM Go to last post
  47. 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: 2,603
    10-22-2006, 04:48 PM Go to last post
  48. Basic Probability Question

    I have a question regarding basic proability. In the problem outlined below I am worried that I have calculated incorrectly. More specifically, I...

    Started by caransom‎, 10-21-2006 05:42 PM
    • Replies: 2
    • Views: 4,673
    10-22-2006, 02:53 PM Go to last post
  49. 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: 2,139
    10-22-2006, 02:20 AM Go to last post
  50. 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: 1,939
    10-21-2006, 11:07 PM Go to last post
  51. How to solve for probability

    Sorry, please disregard this question. Help on this problem dealing with probability. Have the answer but not sure how to get to it: Question:...

    Started by natabomb‎, 10-21-2006 10:30 PM
    • Replies: 1
    • Views: 1,817
    10-21-2006, 10:44 PM Go to last post
  52. should be a simple card problem

    I'm having a tough time figuring out what seems to be a simple conditional probability problem. Three cards are drawn from a stadard deck. What is...

    Started by ericp‎, 10-20-2006 10:09 PM
    • Replies: 2
    • Views: 2,382
    10-21-2006, 03:51 PM Go to last post
  53. probability model driving me crazy

    Hello and I am desperate for some help with a homework question. We have been studying the binomial model were given a problem that does not behave...

    Started by charlesbgsu2006‎, 10-20-2006 11:27 AM
    • Replies: 1
    • Views: 2,154
    10-20-2006, 01:18 PM Go to last post
  54. Approximately normal distribution

    I am trying to figure out how to calculate QU and QL (Quarter 3 and Quarter 4). On some problems, the book tells me what Q3 and Q4 is, and on...

    Started by ricketstar‎, 10-19-2006 11:12 PM
    • Replies: 1
    • Views: 3,037
    10-20-2006, 08:40 AM Go to last post
  55. Probability of Death?

    Each patient that receives a particular drug has a 4% chance of dying because of the medication. If 200 patients receive this drug, what is the...

    Started by nickcherryjiggz‎, 10-15-2006 04:40 PM
    • Replies: 8
    • Views: 3,840
    10-19-2006, 12:05 PM Go to last post
  56. Poisson

    I just took an exam and not sure if I botched up on the Poisson concept which was asked several times. Possion (e^-lambda*lambda^X/X!) .5...

    Started by 3af3afr‎, 10-12-2006 05:55 PM
    • Replies: 1
    • Views: 2,382
    10-19-2006, 06:57 AM Go to last post
  57. Talking Keno or Lotto Revisited

    Jerry, Well, you asked for a new thread ... funny thing is, we were both replying at nearly the same moment, so I had responded to the old thread....

    Started by cet‎, 09-27-2006 04:45 PM
    • Replies: 3
    • Views: 2,984
    10-19-2006, 06:44 AM Go to last post
  58. 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
  59. Unhappy hello

    I need help with a few questions A carton of 12 batteries contains one that is bad. in how many ways can an inspector choose 3 of the batteries...

    Started by Kingkye‎, 10-17-2006 09:43 PM
    • Replies: 1
    • Views: 1,862
    10-18-2006, 11:23 AM Go to last post
  60. 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: 2,291
    10-17-2006, 05:00 PM Go to last post

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