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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: 30,208
    09-30-2005, 09:44 AM Go to last post
  1. Angry Probability Question

    Hi everyone, I have been working on this problem and I think no solution is possible. Please check and see if maybe I am misunderstanding...

    Started by ankitj‎, 07-09-2009 10:22 AM
    • Replies: 2
    • Views: 1,866
    07-09-2009, 12:01 PM Go to last post
  2. Poisson Question! Please help!

    So the question is: A restaurant chef prepares a tossed salad containing, on average, 5 vegetables per day. Find the probability that the salad...

    Started by ankitj‎, 08-11-2009 09:19 AM
    • Replies: 3
    • Views: 5,238
    08-11-2009, 12:06 PM Go to last post
  3. Not sure if I did this right! Please help!

    An oil drilling company ventures into various locations, and their success or failure is independent from one location to another. Suppose that the...

    Started by ankitj‎, 08-11-2009 12:19 PM
    • Replies: 6
    • Views: 4,075
    08-12-2009, 07:44 AM Go to last post
  4. Hopelessly stuck! Please help!

    An electronic switching device occasionally malfunctions and may need to be replaced. It is known that the device is satisfactory if it makes, on...

    Started by ankitj‎, 08-11-2009 06:23 PM
    • Replies: 10
    • Views: 3,950
    08-12-2009, 10:03 AM Go to last post
  5. Another one!

    I think this is correct. I would appreciate any input. Question: The potential buyer of a particular engine requires that the engine start...

    Started by ankitj‎, 08-12-2009 01:38 PM
    • Replies: 2
    • Views: 3,037
    08-17-2009, 10:17 AM Go to last post
  6. Request for help on probability.

    Hi All, I need your help to solve this question. I am preparing for exam and trying to solve this question. A ball is selected from a box...

    Started by anna1999‎, 01-07-2015 03:37 PM
    • Replies: 1
    • Views: 1,058
    01-07-2015, 03:47 PM Go to last post
  7. creating sten scores

    Hi, Please can someone help me out with creating a sten score - I am unsure of the process to follow to do this - is it something that can be...

    Started by AnnaHoy‎, 03-20-2006 12:01 AM
    • Replies: 0
    • Views: 5,989
    03-20-2006, 12:01 AM Go to last post
  8. I am not sure how to solve for a probability when N is not given (beginner help).

I am having the most trouble with part "a)" but I am comparing the two answers so if you feel inclined to discuss part "b)" as well, I would...

    Started by annaml‎, 11-10-2014 12:02 PM
    • Replies: 6
    • Views: 1,217
    11-10-2014, 12:31 PM Go to last post
  9. maximizing profit given pdf

    Here is the problem I came across while studying for the test and need some help: A retail grocer has a daily demand, Y for a certain product sold...

    Started by anna_s‎, 10-14-2008 08:34 AM
    • Replies: 2
    • Views: 6,677
    10-14-2008, 02:16 PM Go to last post
  10. Poisson variables and normal approximation

    I am attaching the questions and my work. It was too difficult to write the formulas in the post. I think I am on the right track - just a little...

    Started by anna_s‎, 10-22-2008 08:50 PM
    • Replies: 1
    • Views: 2,491
    10-23-2008, 06:41 AM Go to last post
  11. transformation of distributions

    Here is a question: Consider a uniform variable U on (0,1) and define the variable X=e^u. Find the distribution of X. Here is the work I've...

    Started by anna_s‎, 10-26-2008 08:44 AM
    • Replies: 6
    • Views: 2,256
    10-26-2008, 01:41 PM Go to last post
  12. uniform dist. parameter est.

    Here is the problem: Use MLE to estimate the parameters of the two parameter uniform pdf f_Y_(y;theta1,theta2)=1/(theta2-theta1);...

    Started by anna_s‎, 11-05-2008 09:32 PM
    • Replies: 1
    • Views: 2,567
    11-06-2008, 02:08 PM Go to last post
  13. Angry Statistic & Probability

    I am having problems completing assignment of 8 problems. I do not know what I am doing and I need this course to graduate in the spring. I would be...

    Started by annharris‎, 11-18-2008 02:50 PM
    • Replies: 1
    • Views: 2,944
    11-20-2008, 03:00 PM Go to last post
  14. Normalized Z-Table Questiong Is this right having problem with final answer

    The amount of time it takes to produce a part is normally distributed with a mean equal to 10 second and standard deviation equal to 2 seconds. Fine...

    Started by ANNJALA‎, 10-10-2016 02:15 PM
    probablity, z table
    • Replies: 2
    • Views: 2,603
    10-10-2016, 07:43 PM Go to last post
  15. Unhappy Binomial Probablity Distribution exactly one & and at least one.. check my answer

    Your favorite baseball player has a 0.300 batting average (that is, he averages three hits for every 10 times he is up to bat). If he is up to bat...

    Started by ANNJALA‎, 10-11-2016 11:31 AM
    binomial probability
    • Replies: 3
    • Views: 2,412
    10-11-2016, 02:35 PM Go to last post
  16. Unhappy really urgent probability problem - is it bayesian?

    Hi, I have an urgent problem but I'm a little lost. Is this probability question referring to the use of Bayes' theorem? Firstly, I don't...

    Started by anony‎, 09-14-2011 05:46 AM
    bayes, prior, probability, sample text
    • Replies: 4
    • Views: 2,795
    09-14-2011, 08:48 AM Go to last post
  17. Probability of simply "guessing" in a Blind Triangle taste test

    Hi, I am a new member to these forums and I have a problem thatís been bugging me. A huge thank you for any help with this one. Itís an odd one. I...

    Started by AnRyan‎, 03-25-2013 10:57 AM
    • Replies: 3
    • Views: 4,087
    03-27-2013, 10:19 AM Go to last post
  18. Post WANT Theoretical Probabilities theory books suggestion

    Hello, I am reading a theoretical probability theory book " Probability Theory: The Logic of science " by E.T.Jaynes. But, this book is very advanced...

    Started by ansh23898‎, 06-20-2015 09:35 AM
    book, probability theory, theory
    • Replies: 1
    • Views: 1,331
    06-21-2015, 01:50 AM Go to last post
  19. Forecasting help needed for google

    Can someone help me with the formula I'd need in order to forecast search results? Here's the problem: Month 1: variable A increases from rank...

    Started by AnthonyM‎, 02-10-2009 02:25 PM
    • Replies: 2
    • Views: 2,335
    02-10-2009, 07:04 PM Go to last post
  20. Challenging Probability Question

    An analyst is presented with lists of four stocks and five bonds. He is asked to predict, in order, the two stocks that will yield the highest return...

    Started by anthonys‎, 03-02-2006 05:15 PM
    • Replies: 2
    • Views: 4,073
    03-03-2006, 01:37 AM Go to last post
  21. random sample probability question

    A company produces cola. The amount of cola in a can is a random variable that is normally distributed with a variance of 0.81 ml. A random sample of...

    Started by anthonys‎, 03-08-2006 12:58 AM
    • Replies: 2
    • Views: 3,246
    03-08-2006, 02:11 PM Go to last post
  22. random sampling question - I need help

    A journalist wanted to learn the views of the chief executive officers of the 500 largest United States corporations on program trading of stocks. In...

    Started by anthonys‎, 03-15-2006 02:24 AM
    • Replies: 2
    • Views: 2,405
    04-01-2006, 01:20 AM Go to last post
  23. Need help with probability

    A local public-action group solicits by telephone. For a particular list of prospects, it was estimated that for any individual, the probability was...

    Started by anthonys‎, 04-01-2006 01:21 AM
    • Replies: 2
    • Views: 3,699
    04-03-2006, 12:40 PM Go to last post
  24. Question Probability

    What are the odds of miss by one all lottery number. In my country the lotto is 38C6. Let say the winning number were: 06, 11, 18, 26, 30, 33 ...

    Started by antonioroques‎, 10-11-2016 02:20 PM
    • Replies: 1
    • Views: 2,435
    10-11-2016, 03:57 PM Go to last post
  25. probability that mean is less that

    Hi everydoby, I have a data. Now I want ot find the probability that the weibull mean of this data is less that 10. does the result of...

    Started by antonitsin‎, 01-12-2012 03:26 PM
    weibull mean
    • Replies: 0
    • Views: 1,274
    01-12-2012, 03:26 PM Go to last post
  26. Bayesian serial chain

    I am trying to understand Bayesian networks and particularly causal (serial) chains. It is defined as P(C|A&B) = P(C|B).This means that the...

    Started by anuket‎, 01-23-2016 01:06 PM
    • Replies: 0
    • Views: 1,429
    01-23-2016, 01:06 PM Go to last post
  27. Bayesian formula with multiple events

    I am trying to predict next location of the user knowing his current (t) and previous location (t-1). I am trying to use Bayesian networks for this....

    Started by anuket‎, 01-23-2016 10:44 AM
    • Replies: 0
    • Views: 1,175
    01-23-2016, 10:44 AM Go to last post
  28. counting problem?

    A closet contains 6 different pairs of shoes. Five shoes are drawn at random. What is the probability that at least one pair of shoes is obtained?

    Started by anyavacy‎, 10-22-2013 06:14 PM
    • Replies: 2
    • Views: 1,251
    11-11-2013, 05:48 PM Go to last post
  29. string counting problem

    We consider permutations of the string ĒABACADAFAGĒ. How many permutations are there? How many of them donít have any A next to other A? How many...

    Started by anyavacy‎, 10-22-2013 06:15 PM
    • Replies: 0
    • Views: 1,267
    10-22-2013, 06:15 PM Go to last post
  30. Bayes thoerem, can you check my solution please?

    Hi, I'm terrible at statistics, i hope someone can help. A ship sank into the sea and is now laying in a fixed but uknown position on the bottom...

    Started by any_body‎, 03-05-2012 07:59 AM
    bayes thoerem
    • Replies: 6
    • Views: 2,163
    03-05-2012, 12:20 PM Go to last post
  31. Monty Hall cf. Deal or No Deal

    Hi We have been having a (rather heated!) discussion regarding why the Monty Hall problem does/does not apply to Deal or No Deal. Wikipedia states...

    Started by aodonnell‎, 01-20-2009 02:16 PM
    • Replies: 3
    • Views: 4,783
    01-24-2009, 11:28 AM Go to last post
  32. Emperical Rule

    In finding the upper and lower bound with 95% confidence, I input numeric data and use descriptive stat on excel for mean and standard deviation....

    Started by aosunkoya‎, 10-21-2016 11:21 PM
    • Replies: 0
    • Views: 2,832
    10-21-2016, 11:21 PM Go to last post
  33. Probability Problem

    I am not sure where how to do this problem. This is what is says Suppose someone passes you a six sided die and bets £100 that you will through...

    Started by ap183‎, 08-03-2010 04:55 PM
    • Replies: 1
    • Views: 2,053
    08-03-2010, 06:52 PM Go to last post
  34. Binomial probability problem

    I have a problem working out the answer to this problem using the binomial formula. Assume an airline operates a short haul flight form Edinburgh...

    Started by ap183‎, 08-04-2010 08:12 AM
    • Replies: 4
    • Views: 3,274
    08-04-2010, 10:57 AM Go to last post
  35. Probability Question

    A question in a tutorial I had was: A bank manager is presented with the details of ten accounts of which two are overdrawn. If he selects three...

    Started by ap183‎, 08-04-2010 12:32 PM
    • Replies: 9
    • Views: 3,012
    08-05-2010, 05:29 PM Go to last post
  36. Probability of FTSE 250

    My Quantitative Methods exam is tomorrow and I really need help with this question, in case this question comes up in the exam. The question is...

    Started by ap183‎, 08-11-2010 01:56 PM
    • Replies: 1
    • Views: 2,160
    08-11-2010, 02:58 PM Go to last post
  37. Probability Model Question

    Hi, if you could help me out with the question below I would really appreciate it. Thanks. A quiz consists of three True-False questions. A...

    Started by Aphrodite‎, 06-21-2009 10:39 PM
    • Replies: 0
    • Views: 3,276
    06-21-2009, 10:39 PM Go to last post
  38. 2 questions: Finding the optimal value of the mean of a standard normal distribution.

    I have two questions involving the Standard Normal Distribution. The first one involves finding the optimal mean, the second one involves proving...

    Started by APOCooter‎, 11-06-2011 03:27 PM
    • Replies: 1
    • Views: 2,819
    11-06-2011, 04:02 PM Go to last post
  39. Question about exponential distribution

    Okay, because P(Y) is an exponential function with mean of 10, I know a=1, B=10 P(Y) = (1/B)e^(-y/B), or (1/10)e^(-y/10). I'm stuck with what to do...

    Started by APOCooter‎, 11-15-2011 03:40 PM
    • Replies: 3
    • Views: 6,598
    11-16-2011, 12:00 AM Go to last post
  40. Continuous Multi-variablel Distribution question

    I'm doing some problems with multi-variable probability distributions and marginal distributions. I think I'm doing them right, but they don't feel...

    Started by APOCooter‎, 12-03-2011 06:00 PM
    • Replies: 0
    • Views: 885
    12-03-2011, 06:00 PM Go to last post
  41. Poisson distribution and moment generating function question

    This is a problem my professor assigned for homework. He said if we can't do it, it's not a big deal; it's a difficult problem. I'd still like to...

    Started by APOCooter‎, 02-05-2012 02:49 PM
    • Replies: 3
    • Views: 5,758
    02-05-2012, 04:45 PM Go to last post
  42. Point Estimation, Bias, and Mean Square Error question

    The reading on a voltage meter connected to a test circuit is uniformly distributed over the interval (theta, theta + 1), where theta is the true but...

    Started by APOCooter‎, 02-12-2012 02:37 PM
    • Replies: 1
    • Views: 7,010
    02-12-2012, 02:55 PM Go to last post
  43. Chi-Square distribution problem

    So my professor started doing stuff with the chi-square distribution this week and I've been lost for almost the entire time. Consider a random...

    Started by APOCooter‎, 02-18-2012 02:20 PM
    • Replies: 7
    • Views: 9,506
    02-18-2012, 05:50 PM Go to last post
  44. Variances and comparison of biased and unbiased estimators.

    If was shown that if: S'^2= (summation(Yi-Ybar)^2)/n and S^2= (summation(Yi-Ybar)^2)/(n-1) then S'^2 is a biased estimator of sigma, but...

    Started by APOCooter‎, 02-21-2012 03:02 PM
    • Replies: 4
    • Views: 2,813
    02-21-2012, 06:40 PM Go to last post
  45. Two questions: one about bias/MSE and one about confidence intervals

    1. Y1, Y2, .... , Yn are a random sample from the Poisson distribution with parameter (mean) lambda > 0. Show that the square root of the sample...

    Started by APOCooter‎, 02-28-2012 05:56 PM
    • Replies: 1
    • Views: 1,954
    02-29-2012, 05:42 AM Go to last post
  46. Confidence Intervals using Most Likely Estimators

    I have data that follows an exponential distribution. I need to find a 95% confidence interval of the following (using the MLE function): 1. The...

    Started by APOCooter‎, 03-18-2012 01:37 PM
    • Replies: 3
    • Views: 1,798
    03-18-2012, 03:37 PM Go to last post
  47. Weird Hypothesis testing with normal distribution -> binomial distribution

    For a random sample of size n=64 from the Normal distribution with a standard deviation=1.22 known tset for a mean, of the hypotheses H0: mu=5...

    Started by APOCooter‎, 04-12-2012 02:30 PM
    • Replies: 0
    • Views: 1,701
    04-12-2012, 02:30 PM Go to last post
  48. Maximum likelihood estimator for a specific value of Y

    Let Y1,Y2,Y3,...,YN denote a random sample of size n from a Poisson distribution with mean lambda. a. Determine the MLE for P b. Obtain (as a...

    Started by APOCooter‎, 04-12-2012 02:53 PM
    • Replies: 1
    • Views: 2,502
    04-12-2012, 03:43 PM Go to last post
  49. Practical Birthday-Month probabilities

    Hello, I have a practical question that arose in a company gathering last week and as a biologist with very little statistic background I am looking...

    Started by apponi‎, 03-23-2015 01:00 PM
    • Replies: 3
    • Views: 1,504
    03-23-2015, 04:37 PM Go to last post
  50. Multiple comparisons in SEM

    Hello, I am using the Multiple Group Analysis function in AMOS to compare three groups. I am using pairwise comparisons to compare group 1 with...

    Started by April‎, 09-24-2013 10:30 AM
    amos, moderation, multiple comparisons, sem
    • Replies: 0
    • Views: 1,246
    09-24-2013, 10:30 AM Go to last post
  51. Exponential (θ ) distribution question

    Xsub1 and Xsub2 are independent Exponential ( θ ), θ >0, random variables. Let S= Xsub1 +Xsub2 Write the PDF of S stating any standard...

    Started by april_gsu2007‎, 11-08-2012 10:58 AM
    • Replies: 1
    • Views: 27,800
    11-08-2012, 11:41 AM Go to last post
  52. probability

    A project director runs a staff consisting of 6 scientists and 3 lab technicians. Three new projects have to be worked on and the director decides to...

    Started by aptiva‎, 05-10-2006 04:32 PM
    • Replies: 1
    • Views: 2,664
    05-10-2006, 07:17 PM Go to last post
  53. prob word problem Q

    A growing manufacturing company has kept careful records of applicants who have applied for jobs on their assembly lines. The probability that a new...

    Started by aptiva‎, 05-15-2006 10:43 PM
    • Replies: 1
    • Views: 2,907
    05-16-2006, 12:10 PM Go to last post
  54. probability geneticist

    I was able to answer the first 3 parts of this question but i cant figure out the last one A geneticist has bred three different strains of...

    Started by aptiva‎, 05-23-2006 12:14 PM
    • Replies: 1
    • Views: 2,725
    05-24-2006, 08:02 PM Go to last post
  55. another probability

    this question has three parts and once again I was able to answer part A and B by drawing the tree diagram but I cant seem to figure out part C ...

    Started by aptiva‎, 05-23-2006 12:26 PM
    • Replies: 2
    • Views: 2,644
    05-25-2006, 09:05 PM Go to last post
  56. Exclamation Probability of developing a lung cancer disease

    I need to solve this problem: A cohort study is done to assess the impact of smoking on lung cancer. In this study, a large representative sample...

    Started by aptremblay‎, 03-01-2017 03:46 PM
    probability, probability homework help, statistics, statistics problems
    • Replies: 5
    • Views: 2,033
    03-01-2017, 06:30 PM Go to last post
  57. Question trouble...

    Working on this for a class and wondering if I did this correctly. If anyone could help that would be great. Thanks in advance! 60% of the...

    Started by aqulopez44‎, 09-28-2009 05:00 PM
    • Replies: 2
    • Views: 2,405
    09-28-2009, 10:50 PM Go to last post
  58. Conditional probability answer check

    I just want to check my answer with you guys. A supermarket wants to know peoples shopping habits. 250 were surveyed. 60% was females. 70% of all...

    Started by ar0157‎, 10-15-2015 08:37 PM
    • Replies: 1
    • Views: 1,465
    10-15-2015, 09:36 PM Go to last post
  59. Unhappy Help in understand this formula

    Hello to all, I'm working on a problem which is as follow: There is a buffer which has maximum K capacity to store items. When a request for an...

    Started by aram_2‎, 08-03-2012 05:12 AM
    • Replies: 1
    • Views: 772
    08-03-2012, 10:20 AM Go to last post
  60. Probability in rates

    Hello there, I've got a problem that is probably very simple but I just can't figure it out. Imagine that there is an event A that can happen...

    Started by Ararapina‎, 02-22-2012 11:55 AM
    • Replies: 2
    • Views: 1,739
    02-22-2012, 04:14 PM Go to last post

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