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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: 30,323
    09-30-2005, 09:44 AM Go to last post
  1. 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: 8,692
    06-11-2009, 08:09 AM Go to last post
  2. CDF of difference of chi squared random variables

    Hi, I posted this question under "Probability Theory" and got no response. Maybe I'd have better luck here? I'm interested in obtaining a...

    Started by rhz‎, 11-10-2011 01:15 PM
    • Replies: 1
    • Views: 8,659
    11-10-2011, 03:50 PM Go to last post
  3. I need helpf with this one, for probability - binomial distribution

    According to a recent study, 38% of all women will suffer a hip fracture because of osteoporosis by the age of 85. If six women aged 85 are randomly...

    Started by miriam‎, 06-01-2012 09:26 AM
    • Replies: 4
    • Views: 8,654
    06-01-2012, 12:04 PM Go to last post
  4. Joint Density f(X,Y) integration when there is no Y in the eqn

    Hi I'm having difficulties with integration by parts when the main function of a joint distribution doesn't contain the Y. Here it is: Let X and Y...

    Started by crusoe‎, 02-12-2011 06:35 PM
    2 Pages
    1 2
    • Replies: 24
    • Views: 8,651
    02-14-2011, 04:09 AM Go to last post
  5. quick question: probability of being dealt a royal flush?

    if you have a standard deck of cards and are dealt 5 cards randomly, what are the chances of getting a royal flush? i feel like this is pretty...

    Started by Rhodo‎, 01-30-2012 02:04 PM
    • Replies: 5
    • Views: 8,631
    02-02-2012, 05:57 PM Go to last post
  6. Adding normal distribution - z-scores

    Hi - I have a quick question. I understand that the sum of two normal distributions is a normal distribution. Now let's say I have the z-score...

    Started by kurt9090‎, 06-05-2012 07:36 AM
    • Replies: 5
    • Views: 8,630
    06-05-2012, 09:21 AM Go to last post
  7. 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: 8,619
    02-01-2006, 11:43 AM Go to last post
  8. Buffon's Needle Experiment

    This problem is quite interesting: A fine needle of length l is dropped at random on a board covered with parallel lines distance d apart where...

    Started by quark‎, 10-04-2005 02:08 PM
    • Replies: 0
    • Views: 8,610
    10-04-2005, 02:08 PM Go to last post
  9. Finding Dist. Function in the form Y= aX+b

    Hi There, I havent actually attempted this question yet, but if anybody can provide me with a guide to answering it I'd be really greatful. Let X...

    Started by woody198403‎, 05-09-2008 02:36 AM
    • Replies: 5
    • Views: 8,588
    05-14-2008, 06:33 AM Go to last post
  10. Normal Distribution & possible Standard Deviation error

    I have collected final sales data for over 12,000 sales of a single particular item. The prices range from $0.01 to a little over $4.00. I calculate...

    Started by derreckn‎, 02-18-2011 04:19 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 8,587
    02-23-2011, 09:10 AM Go to last post
  11. Unhappy Probability for Zener pyshic card test

    Hi, My Name is Mark Fennell, and I am a flash game developer. (My games are at www.markfennell.com/flash and www.blastone.com) Anyways, my next...

    Started by mfennell‎, 05-19-2008 05:59 PM
    • Replies: 3
    • Views: 8,564
    01-20-2009, 09:01 PM Go to last post
  12. Biased Coin and Conditional Probability

    Here's another question that I'm trying to work the kinks out of. Consider a biased coin with the probability of getting heads being p. The coin...

    Started by tom86‎, 10-04-2009 05:15 PM
    • Replies: 1
    • Views: 8,560
    10-04-2009, 06:53 PM Go to last post
  13. Conditional Probability

    I need help with a couple of conditional probability questions: If a person is vaccinated properly, the probability of his/her getting a certain...

    Started by nancyspe‎, 11-20-2013 12:47 AM
    • Replies: 4
    • Views: 8,531
    11-20-2013, 10:57 PM Go to last post
  14. Question Show that Expectation does not exist ?

    I've been stuck on this question for a few hours and would appreciate any help. Q. X is a random variable with mass function Px(x) =...

    Started by jenny1111‎, 04-20-2011 06:40 PM
    • Replies: 2
    • Views: 8,526
    04-20-2011, 11:38 PM Go to last post
  15. How to calculate probability on dice groups.

    I'm a game designer studying the probability curves of various dice throwing mechanics. I know some basic statistics but it's been a while since I...

    Started by marcsterix‎, 12-22-2010 10:24 PM
    • Replies: 6
    • Views: 8,521
    12-23-2010, 02:39 PM Go to last post
  16. Please help me.I need your support

    Eight tyres of different brands are ranked from 1 to 8 (best to worst) according to mileage performance. If four of these tyres are selected at...

    Started by mika‎, 03-14-2006 11:07 PM
    • Replies: 2
    • Views: 8,515
    03-20-2006, 10:42 AM Go to last post
  17. Poisson Distribution(Homicide Deaths)

    Hi, I have attempted the following question. Half I could solve, I need help to complete it. Question In one year, there were 116 homicide deaths...

    Started by Thakur‎, 04-14-2009 03:57 PM
    • Replies: 1
    • Views: 8,506
    04-14-2009, 09:01 PM Go to last post
  18. Exclamation Binomial Distribution help

    Assume that a procedure yields a binomial distribution with a trial repeated n times. Use the binomial probability formula to find the probability of...

    Started by Katze‎, 12-12-2010 01:56 PM
    • Replies: 2
    • Views: 8,504
    12-12-2010, 02:03 PM Go to last post
  19. Finding data value corresponding to a probability

    My apologies if this is in the wrong section first of all, probability seemed appropriate. Starting off with the question I'm trying to come up...

    Started by goles‎, 03-20-2011 04:43 PM
    • Replies: 6
    • Views: 8,412
    03-20-2011, 06:47 PM Go to last post
  20. Median and Mean of Independent Random Variables

    Hello, Here is the question: Let X_1,X_2, . . . ,X_n be random variables with the density \frac{1}{1+x^2} for x \in ({-\infty},{\infty}) ;...

    Started by Matt M‎, 12-22-2010 12:32 PM
    • Replies: 5
    • Views: 8,397
    07-08-2012, 09:54 AM Go to last post
  21. 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: 8,389
    05-13-2009, 05:32 PM Go to last post
  22. Variance of the sample variance

    I am looking to compute the variance of the sample variance. I found a site that does this for the biased sample variance (i.e. 1/n rather than...

    Started by kogan.clark‎, 10-22-2010 10:59 AM
    • Replies: 2
    • Views: 8,325
    10-25-2010, 10:39 AM Go to last post
  23. Unhappy probability Homework help please

    I have a stats probability problem for homework. It is a chart showing a survey of patients regarding satisfaction with care and type of surgery. ...

    Started by strugglingwstats‎, 10-21-2008 07:09 PM
    • Replies: 2
    • Views: 8,317
    10-22-2008, 07:05 AM Go to last post
  24. Thinking Fast and Slow - Probability question

    In his book (Thinking Fast and Slow) Kahneman states: For example, if you believe that 3% of graduate students are enrolled in computer science (the...

    Started by wardjames‎, 02-06-2012 12:01 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 8,307
    02-08-2012, 04:30 PM Go to last post
  25. Student Enrollment Probability

    Hey everyone, back again with another problem giving me problems. A local university reports that 3% of their students take their general...

    Started by hackman2007‎, 02-23-2009 06:30 PM
    • Replies: 6
    • Views: 8,303
    02-27-2009, 07:44 PM Go to last post
  26. Unhappy uniform distribution

    A manager of a store reports that the time of a customer on the second floor must wait for the elevator has a uniform distribution ranging from 2 to...

    Started by megs915‎, 10-23-2005 06:43 PM
    • Replies: 5
    • Views: 8,296
    10-24-2005, 12:04 PM Go to last post
  27. linear combination of exponential distributions

    I have an equation with linear combination of exponential distributions, i.e. sum (c_i * exp(a_i)) on the right hand side, and on the left hand...

    Started by sarai‎, 04-19-2011 09:46 AM
    estimation, exponential distribution, function estimation, poisson
    • Replies: 2
    • Views: 8,254
    05-10-2011, 06:09 PM Go to last post
  28. Binomial Distribution Problem - How to interpret the given information

    Your company is running an audit on the Sleaze Company. Because Sleaze has a bad habit of issuing incorrect invoices, the focus of your audit is on...

    Started by raamaak‎, 02-27-2011 10:50 PM
    • Replies: 5
    • Views: 8,231
    10-04-2011, 01:58 PM Go to last post
  29. Logistic Distribution Question

    I have two independent random variables each with a logistic distribution (not necessarily same mean and variance). How is the difference (or sum)...

    Started by koochak‎, 04-23-2010 06:18 AM
    • Replies: 6
    • Views: 8,222
    04-27-2010, 07:22 AM Go to last post
  30. Probability of exactly one?

    Hello, I have a question that I am stuck on. Given: the probability of passing a Photography class is 75% and the probability of passing a...

    Started by vit_mar‎, 11-19-2008 06:40 PM
    • Replies: 9
    • Views: 8,210
    11-21-2008, 07:29 AM Go to last post
  31. Question Conditional covariance

    X_i\sim Ber(\frac{1}{4}) and Y_i\sim Ber(\frac{3}{4}). Find Cov(\sum_{i=1}^{N} X_i,\sum_{i=1}^{N} Y_i) where P(N=k)=\frac{1}{2^k} for k=1,2,3,.... ...

    Started by Sambit‎, 05-13-2011 09:45 AM
    • Replies: 5
    • Views: 8,195
    05-15-2011, 10:09 AM Go to last post
  32. Advantage of reducing process variation?

    The question is, "What is the advantage of reducing process variation, thereby causing process control limits to be at a greater number of standard...

    Started by sukaloop‎, 03-02-2012 02:59 PM
    • Replies: 4
    • Views: 8,193
    03-08-2012, 02:30 PM Go to last post
  33. Exclamation Appropriate Hypothesis

    A company with a large fleet of cars hopes to keep gasoline costs down, and sets a goal of attaining a fleet average of at least 26 miles per gallon....

    Started by dmicevski‎, 06-01-2011 10:58 PM
    • Replies: 2
    • Views: 8,187
    06-07-2011, 10:26 PM Go to last post
  34. Expected value and variance of bootstrap estimate

    Hi all! I have a question about bootstrapping. Let the variance estimate based on B bootstrap samples be \widehat{SE}^2_B =...

    Started by JennySton‎, 04-18-2010 11:07 AM
    • Replies: 2
    • Views: 8,141
    04-19-2010, 06:59 AM Go to last post
  35. Joint probability distribution table

    Helllo, I have this problem for an assignment: 1. It is known that box C has 3 blue balls, numbered from 1 to 3, and 2 red balls, numbered from 4...

    Started by bgrober‎, 10-18-2010 04:18 PM
    • Replies: 1
    • Views: 8,140
    10-18-2010, 05:16 PM Go to last post
  36. Alternative to chi-squared test needed

    Hi all. I need a goodness of fit test for a situation in which a chi-squared test isn't appropriate - where the sum of the expected values does...

    Started by jdrbaldwin‎, 04-09-2011 05:23 AM
    alternative, bernoulli, chi-square, goodness of fit, sampling
    • Replies: 5
    • Views: 8,111
    04-15-2011, 05:23 PM Go to last post
  37. Geometric Probability

    Can someone help me with this problem and check my answer.. (I know its a long read but the questions are not hard) Mr. Nedrdly, the long time ap...

    Started by Stunt101‎, 01-12-2007 05:32 PM
    • Replies: 1
    • Views: 8,095
    01-12-2007, 07:30 PM Go to last post
  38. CDF problem

    Problem - Let X be a random variable with c.d.f. F(x). Find the c.d.f. of aX + b first for a > 0, then for a < 0. (for a > 0) F(x) = P(X <= x) ...

    Started by StatStudent3‎, 10-30-2010 04:59 PM
    • Replies: 8
    • Views: 8,095
    11-02-2010, 04:24 PM Go to last post
  39. Calculating Hazard Ratios

    Hi there, I would like to calculate the hazard ratio (or deviation from the mean) for an 'event' My data has the dates of 'events' and I would...

    Started by MrT‎, 08-28-2013 01:48 AM
    • Replies: 4
    • Views: 8,086
    08-28-2013, 09:12 AM Go to last post
  40. The probability of seeing 13 minutes past the hour at least once every day?

    Each day, there are 24 opportunities in a 24 hour period to see 13 minutes past the hour. There are 60 x 24 possible times that can be reported in...

    Started by Petros‎, 10-30-2014 09:35 AM
    2 Pages
    1 2
    • Replies: 28
    • Views: 8,072
    11-08-2014, 03:40 PM Go to last post
  41. Sampling Error Probability

    Hello, This is my first time posting here, I stumbled upon this site when I was searching for information on the following problem which I...

    Started by Raven‎, 06-28-2009 09:28 PM
    • Replies: 3
    • Views: 8,068
    06-29-2009, 06:15 PM Go to last post
  42. Simple probablility question

    A closet contains 8 pairs of shoes. If 4 shoes are randomly selected, what is the probability that there will be no complete pair? So i know that...

    Started by c2q‎, 06-08-2010 12:51 AM
    • Replies: 8
    • Views: 8,067
    06-08-2010, 05:53 PM Go to last post
  43. Difference between two Normal Distributions

    I have a problem where I have two Normal distributions both with a standard deviation of 20 and a difference between the means of 17. I want to work...

    Started by tja26‎, 06-13-2006 10:41 AM
    • Replies: 0
    • Views: 8,066
    06-13-2006, 10:41 AM Go to last post
  44. Need help asap! Please help

    There are three teams in a cross-country race. Team A has five runners, team B has six runners, and team C has seven runners. In how many ways can...

    Started by lilcutee14life‎, 09-09-2010 11:54 PM
    • Replies: 9
    • Views: 8,049
    09-16-2010, 07:06 PM Go to last post
  45. 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: 8,039
    03-31-2008, 12:12 AM Go to last post
  46. Probability, binominal distribution

    A hotel manager knows that approximately 5 % of the reservations are so called “no-shows” – people who have made a reservation, but do not arrive...

    Started by JackSwan‎, 02-02-2010 12:15 PM
    • Replies: 6
    • Views: 8,027
    02-03-2010, 03:22 AM Go to last post
  47. Margin of Error/Sample Size...

    I have another questions that I am not totally sure of the answer.... It has to do with the size of a sample. This is the question... Q: A...

    Started by mackerbuddy‎, 11-12-2005 08:34 AM
    • Replies: 1
    • Views: 8,022
    11-12-2005, 09:09 AM Go to last post
  48. Question Elevator probability question

    This morning, when I walked into the elevator, I had this question in my mind. Five people walk into an elevator at Ground level. There are 17...

    Started by oddsnevens‎, 04-17-2008 02:08 PM
    • Replies: 4
    • Views: 8,009
    04-18-2008, 02:27 PM Go to last post
  49. Smile How do you find best probability density distribution for a data set?

    How do you find the best probability density distribution that fits a particular data set? Is there any software that will take a data set and run...

    Started by Jim21‎, 11-03-2009 02:30 PM
    • Replies: 2
    • Views: 8,003
    03-07-2012, 02:15 PM Go to last post
  50. How do I add percentages?

    For instance, let's say a person is a truck driver and there's an: 80% chance of they smoke 40% chance of they are overweight 60% chance of they...

    Started by cpaavola‎, 04-30-2010 11:30 AM
    • Replies: 4
    • Views: 7,996
    05-03-2010, 11:15 AM Go to last post
  51. 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: 7,985
    06-02-2009, 11:20 AM Go to last post
  52. Homework Help with continuous probability distributions

    Hi if anyone can help me on these two problems, i would really appreciate it. i'm looking at my notes and txtbook, but still don't understand it. ...

    Started by Linda Yang‎, 10-19-2011 11:17 PM
    exponential continous
    • Replies: 1
    • Views: 7,980
    10-19-2011, 11:52 PM Go to last post
  53. Not understanding Normal Distribution

    I am having trouble wrapping my head around normal distributions and the revelance it has with statistics.--- Can someone help me to understand in...

    Started by jennifer E‎, 10-24-2005 11:58 AM
    • Replies: 3
    • Views: 7,960
    10-24-2005, 03:43 PM Go to last post
  54. Exclamation Business Stats question...desperate for help

    My professor has assigned this problem and I have no idea what else to try. I have tried binomial distributions and poisson. It is in a chapter on...

    Started by rmevans1‎, 02-16-2009 09:19 PM
    • Replies: 1
    • Views: 7,941
    02-16-2009, 09:44 PM Go to last post
  55. figuring out a cutoff value

    :confused: Hello :confused: Since my teacher hasn't replied to any of my e-mails, I could use some help related to continuous probability...

    Started by half-life‎, 05-16-2006 10:28 PM
    • Replies: 1
    • Views: 7,914
    05-19-2006, 12:20 PM Go to last post
  56. Pooled Variance Distribution

    Hi, I hope I am posting this in the correct forum. I have two populations and I've been taking samples from each population and calculating the...

    Started by fcc‎, 11-29-2010 01:49 PM
    • Replies: 3
    • Views: 7,905
    11-29-2010, 07:59 PM Go to last post
  57. Smile Conditional expectation, normal distributions

    I'm having some trouble with the following problem: Problem: Let X and Y be independent N(0,1) random variables. Determine E(X|X>Y) My...

    Started by saubersbox‎, 06-27-2013 02:18 PM
    • Replies: 4
    • Views: 7,895
    06-27-2013, 05:38 PM Go to last post
  58. Find the constant that makes f(x,y) a probability density function

    Let X and Y have a joint density function given by f(x,y) =e^(-kX), 0<=X<inf, 0<=Y<=1, k is a constant, and 0 elsewhere Find the value...

    Started by alias‎, 10-05-2011 04:25 PM
    • Replies: 12
    • Views: 7,868
    10-05-2011, 09:36 PM Go to last post
  59. Genotype probabilities

    I'm having difficulty with this problem, although it seems easy. The possible genotypes of an organism are AA, Aa and aa (Aa and aA are...

    Started by root45‎, 10-11-2010 05:56 PM
    • Replies: 1
    • Views: 7,824
    10-11-2010, 11:59 PM Go to last post
  60. Probability of combinations of events

    Hello, I am trying to solve the following problem: We have a set of events and we know the probability of each event. We do not have values for...

    Started by steve1010‎, 10-11-2010 09:27 AM
    • Replies: 2
    • Views: 7,819
    10-11-2010, 11:38 PM Go to last post

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