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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: 30,168
    09-30-2005, 09:44 AM Go to last post
  1. Properties of discrete random variables

    Hello, would some one with more experience mind to confirm or correct me: For discrete random variables I know: E = aE+b and...

    Started by jocali‎, 11-23-2010 08:05 PM
    • Replies: 4
    • Views: 7,115
    11-28-2010, 12:37 PM Go to last post
  2. Question How to solve composite function of random variable?

    X is a Cauchy random variable (fX(x)=1/pi(x^2 + 1)). Determine fY(y) if Y=g(X) and g(x) is: x-1 x>1/2 ...

    Started by sajee3a‎, 09-25-2010 03:10 AM
    • Replies: 1
    • Views: 7,107
    09-25-2010, 03:59 AM Go to last post
  3. Time Series Analysis

    Hello All. I am a new member to this forum. I wish to understand a couple of papers ...

    Started by StatsOntheSide‎, 10-05-2011 08:00 PM
    • Replies: 7
    • Views: 7,095
    04-18-2017, 03:10 PM Go to last post
  4. Conditional Probability...

    Hello, I'm working on a problem, and I think I'm doing it correctly, but it doesn't really match what I wrote down in class - so I think maybe I...

    Started by mackerbuddy‎, 11-11-2005 04:49 AM
    • Replies: 1
    • Views: 7,088
    11-11-2005, 12:50 PM Go to last post
  5. probability problem

    Hi, First Thanks in advance. I am current studying distance education and struggle with some probability homework Qs. So glad I found this site. ...

    Started by fool‎, 03-18-2011 01:32 AM
    • Replies: 9
    • Views: 7,083
    03-21-2011, 10:35 PM Go to last post
  6. Red face Properties of Sample Proportions

    A city council is considering drafting legislation related to the exclusion of renters with children. Since implementation will be expensive, they...

    Started by klsybrns‎, 11-04-2012 07:55 AM
    help needed, help please, probability, probability distribution, statistic
    • Replies: 1
    • Views: 7,078
    11-04-2012, 09:02 AM Go to last post
  7. Expectation Operator

    I understand the Expectation (and the expectation operator) in a very crude sense. For example, when applied to both discrete or continuous...

    Started by jamesmartinn‎, 08-04-2010 09:06 PM
    • Replies: 2
    • Views: 7,067
    08-05-2010, 11:49 AM Go to last post
  8. HW: Probability of baby gender given ultrasound results

    Given the data on 1000 births, determine if an ultrasound is a reliable method for predicting unborn gender: Ultrasound predicted female/Actual...

    Started by Kyle Patnode‎, 10-02-2011 08:36 PM
    • Replies: 1
    • Views: 7,054
    10-02-2011, 09:02 PM Go to last post
  9. Erf & Solving for x in the Normal Distribution cdf

    The cdf formula for Normal Distribution is: f(x) = 1/2 If mu = 0 and sigma = 200 x square root of 2 then f(x) = 1/2 Since f(x) is a...

    Started by StevenCraigMiller‎, 04-17-2011 10:04 AM
    • Replies: 3
    • Views: 7,032
    04-18-2011, 07:07 AM Go to last post
  10. Question Statistics Research Process - Please help

    :confused: Hello Stat-helpers, I am currently taking a Statistics course online, which I am learning solo and need your assistance. I am a quick...

    Started by Bella Love‎, 12-27-2009 05:06 AM
    • Replies: 0
    • Views: 7,028
    12-27-2009, 05:06 AM Go to last post
  11. Probability in Census

    Hey, having some trouble with a problem: The 2000 census allowed each person to choose from a long list of races. That is, in the eyes of the...

    Started by legalesey‎, 03-11-2011 08:24 PM
    • Replies: 4
    • Views: 7,022
    03-15-2011, 05:25 PM Go to last post
  12. r-value > Probability

    I have two wrestlers who are going to arm-wrestle. I want to try to predict who will win based on their previous fights against other opponents....

    Started by cmarkc‎, 08-19-2011 08:37 AM
    • Replies: 14
    • Views: 7,007
    08-24-2011, 06:14 AM Go to last post
  13. 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: 7,002
    02-12-2012, 02:55 PM Go to last post
  14. 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: 6,973
    06-01-2009, 01:58 AM Go to last post
  15. Probability question in section involving conditonal probability

    With probability of 1/6 there are i defective fuses among 1000 fuses (i = 0, 1, 2, 3, 4, 5). If among 100 fuses selected at random, none was...

    Started by Zennie‎, 10-07-2010 12:24 AM
    • Replies: 1
    • Views: 6,967
    10-07-2010, 10:42 AM Go to last post
  16. Question How to modify this function to be a probability density function????

    f(t)=t^2 (1-t)^2 (u(t)-u(t-1)), where u(t) is the unit step function. SHOULD I INTEGRATE f(t) where i get F(T) AND THEN DIFFERENTIATE F(T) TO GET...

    Started by sajee3a‎, 09-21-2010 01:09 PM
    • Replies: 4
    • Views: 6,962
    09-21-2010, 04:25 PM Go to last post
  17. Exclamation Simple Probability Question... That I Don't Understand

    I am attempting to do some online homework but I'm stuck on the very first question. The first bit wasn't too hard to figure out (I merely multiplied...

    Started by teris‎, 10-04-2009 07:33 PM
    • Replies: 4
    • Views: 6,952
    10-04-2009, 08:48 PM Go to last post
  18. Markov Chain: Absorbtion Probability and Hitting Time

    Hi Suppose i have a markov chain with state (0,1,2,3) whose transition matrix looks like this .25, 0, .5, .25 .2, .2, 0, .6 0, 0, 1, 0 ...

    Started by lrado1‎, 09-14-2010 07:33 AM
    • Replies: 3
    • Views: 6,923
    09-15-2010, 07:34 AM Go to last post
  19. 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: 6,915
    02-05-2006, 10:12 AM Go to last post
  20. [SOLVED] Need help with a problem that I THINK requires Bayes Theorem....

    For the combined ELISA-Western blot blood test for HIV positive status, the sensitivity is about 0.999 and the specificity os about 0.9999. Consider...

    Started by kelly g‎, 01-27-2012 09:07 PM
    • Replies: 12
    • Views: 6,900
    01-28-2012, 03:33 PM Go to last post
  21. Marginal pdf

    let X and Y be random variable with joint pdf fxy(x,y) = (2/5)*(3x+2y) 0<x<1, 0<y<1. b) calculate the marginal distributions for this i did...

    Started by Horto‎, 09-02-2009 08:06 PM
    • Replies: 3
    • Views: 6,895
    09-08-2009, 12:35 PM Go to last post
  22. Question Joint cdf/pmf- Multinomial Distribution.

    I'll really appreciate if somebody could take time to explain the following question's answer. Suppose that (N1, N2) is multinomial with n=2,...

    Started by Actuarial_Deepika‎, 01-30-2011 02:53 AM
    • Replies: 4
    • Views: 6,895
    01-30-2011, 11:41 PM Go to last post
  23. Somebody help me please :(

    I am unsure how to do this problem. Can somebody please help me. I was shown on my TI-83 how to do problems similar, (binobpdf) so I don't know if I...

    Started by kr_wynn‎, 10-26-2009 11:28 AM
    • Replies: 1
    • Views: 6,878
    10-26-2009, 11:39 AM Go to last post
  24. poisson distribution help

    hey! i am having a hard time understanding this problem. i just need to know how to get started and then i am good from there. here is the...

    Started by rodizzl‎, 09-27-2008 03:41 PM
    • Replies: 1
    • Views: 6,876
    09-28-2008, 12:42 AM Go to last post
  25. Expected Value Problem

    The heights of all male students in a university have mean 170 centimetres and standard deviation 10 centimetres. Three male students are randomly...

    Started by vegluv‎, 10-09-2010 08:41 PM
    • Replies: 12
    • Views: 6,866
    10-17-2010, 10:23 PM Go to last post
  26. [SOLVED] Correlation between two normal variables ...

    Suppose A ~ N (0,a), B ~ N (0,b-a), C = A + B what is the expression for the correlation between A and C?

    Started by BigBugBuzzz‎, 02-03-2012 12:37 PM
    2 Pages
    1 2
    correlation, normal random variables
    • Replies: 17
    • Views: 6,860
    02-04-2012, 11:48 AM Go to last post
  27. What is variance of X-bar^2, if X ~ N(theta, sigma^2), sigma is known?

    I want to calculate variance of X-bar^2, (mean of X)^2, when Xi ~ Normal(theta, sigma^2) and sigma is known. plz help.

    Started by Yihyunsoo‎, 10-09-2012 12:09 PM
    • Replies: 3
    • Views: 6,847
    10-10-2012, 10:02 AM Go to last post
  28. Smile Please help me! binomial probability

    Hi everyone, I m new to stats and I m stuck with this two question for 2 hours now...I ll be really appreciate if someone here could show me how to...

    Started by baisha‎, 02-06-2011 06:48 AM
    • Replies: 2
    • Views: 6,846
    02-06-2011, 02:17 PM Go to last post
  29. Normal/Binomial Distribution question

    Hey guys, I was hoping someone could help me out with this question that I've been stuck on for a few days now. "Shorty's muffler advertises...

    Started by nataher‎, 04-06-2009 02:52 PM
    • Replies: 0
    • Views: 6,845
    04-06-2009, 02:52 PM Go to last post
  30. Describe Sample Space

    Suppose you toss a fair coin until you obtain exactly R heads. 1) What is the probability that K tosses are required? 2) Describe your sample space....

    Started by jamesmartinn‎, 10-16-2010 08:51 PM
    • Replies: 2
    • Views: 6,818
    10-16-2010, 10:27 PM Go to last post
  31. need help with a couple questions

    1) The US Army requires women's height to be between 58 in. and 80 in. Find the percentage of women meeting that height requirement. Women's heights...

    Started by xUnderclassHero‎, 12-16-2008 03:14 PM
    • Replies: 8
    • Views: 6,804
    12-16-2008, 05:15 PM Go to last post
  32. probability of rocket launch failure

    hi everyone. My statistics/probability knowledge is unfortunately striving towards zero, therefore I would greatly appreciate any kind of input on...

    Started by julia_w‎, 03-03-2011 07:38 AM
    consecutive, probability
    • Replies: 4
    • Views: 6,804
    03-03-2011, 10:24 AM Go to last post
  33. probability question im having trouble with

    1. A system contains 2 identical pumps 1 and 2, if one pump fails the system will still operate however because of the added strain the other pump is...

    Started by mattg‎, 10-14-2008 04:33 PM
    • Replies: 1
    • Views: 6,795
    10-24-2008, 07:17 PM Go to last post
  34. i need help with normal distribution please

    i can't answer this example...can anyone help me asap please.. The diameter of the dot produced by a printer is normally distributed with a mean...

    Started by zerofreeze‎, 01-18-2008 02:49 AM
    • Replies: 5
    • Views: 6,794
    01-18-2008, 03:59 PM Go to last post
  35. Chess probability of winning

    I've gotten into Chess recently with this app on my iphone and its gotten me thinking...has anyone worked with statistical algorithms for chess...

    Started by Link‎, 01-14-2011 07:12 PM
    • Replies: 3
    • Views: 6,793
    01-17-2011, 03:11 PM Go to last post
  36. 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: 6,789
    11-23-2005, 11:59 AM Go to last post
  37. Random Variable Probability HW Help.

    I am lost due to the fact that extra information was provided. An investor plans to invest $50,000 in one of four investments. The return on each...

    Started by barnetod‎, 12-04-2006 10:13 PM
    • Replies: 3
    • Views: 6,778
    12-07-2006, 07:54 AM Go to last post
  38. Counting rules.

    Hi, Can someone please explain to me why the answer to this question is as written? Suppose we deal four 13-card bridge hands from an ordinary...

    Started by c2q‎, 09-24-2010 03:50 PM
    • Replies: 9
    • Views: 6,770
    09-26-2010, 08:20 PM Go to last post
  39. Proof of covariance of a weak stationary stoch. process.

    Hey there. I'm having trouble on how to show this is true. Assuming you have a weakly stationary independent increments stochastic process with ...

    Started by c2q‎, 02-05-2012 02:43 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 6,742
    02-05-2012, 04:22 PM Go to last post
  40. Question about mutually exclusive probability

    How do i find mutually exclusive probability? it says in my book that if p(A or B) = p(a) + p(b) then the events are mutualy exclusive. Or does it...

    Started by Nellen2222‎, 10-05-2012 08:26 PM
    • Replies: 14
    • Views: 6,739
    10-06-2012, 08:19 PM Go to last post
  41. Joint density. Help!

    Let x and y have the joint density: f(x,y) = 6/7(x+y)^2 for 0<=x<=1 and 0<=y<=1 a.Find the marginal densities of X and Y. . b.By integrating...

    Started by Actuarial_Deepika‎, 01-30-2011 11:56 PM
    joint density, marginal density
    • Replies: 1
    • Views: 6,735
    01-31-2011, 03:01 AM Go to last post
  42. Probabilistic Graphical Model

    I created a data frame from what the instructor gave me for my homework: > cbind(Person.ID, Lerner.Alum, KJ, R) Person.ID Lerner.Alum KJ R...

    Started by DV Man‎, 11-06-2016 05:40 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 6,728
    11-09-2016, 02:32 PM Go to last post
  43. Exclamation Z-scores & Central Limit Theory

    I have been trying to work on my stats for a right long time now. I can't figue out this one question in my textbook. I don't understand or even know...

    Started by nursing101‎, 11-05-2010 07:03 PM
    • Replies: 1
    • Views: 6,724
    11-05-2010, 08:04 PM Go to last post
  44. Upper bound for the probability one random variable will be greater than another

    Hi Everyone! Just came across this forum a few weeks ago and have already gotten some great use out of it. Just want to say thanks to all the really...

    Started by reddavies‎, 03-07-2010 05:55 AM
    • Replies: 2
    • Views: 6,720
    03-07-2010, 11:33 AM Go to last post
  45. need help to calculate variance of sales

    Hi, I'm trying to calculate numerical value of the variance of sales, and the probability of a sale greater than 6300 cans. but it seems wrong...

    Started by meriksso‎, 09-19-2011 10:46 PM
    probability question, variance, z-table
    • Replies: 14
    • Views: 6,715
    09-21-2011, 07:18 PM Go to last post
  46. Hypergeometric distribution problem

    A purchaser receives small lots (N = 25) of a high precision device. She wishes to reject the lot 95% of the time if it contains as many as seven...

    Started by pearl‎, 09-13-2010 09:46 AM
    • Replies: 8
    • Views: 6,683
    09-13-2010, 02:49 PM Go to last post
  47. confused by normal distributions with variance smaller than 1

    Hello, I am currently working with some normal distributions, and got confused by some specific situation where the density function does not look...

    Started by nightlordtw‎, 10-27-2009 10:56 AM
    • Replies: 5
    • Views: 6,665
    10-29-2009, 05:30 AM Go to last post
  48. Geometric RV

    So i have a question... If X is a geometric RV with parameter p (the geometric definition where x=0,1,2,3...) 1. compute the distribution of...

    Started by ladyluck‎, 12-14-2010 01:04 AM
    • Replies: 5
    • Views: 6,664
    12-14-2010, 09:08 PM Go to last post
  49. Uniform Distn, Power Function

    Let X1 , ... , Xn ∼ Uniform(0, θ) and let Y = max{X1 , ... , Xn }. We want to test H0 : θ = 1/2 versus H1 : θ > 1/2. Suppose we decide to test...

    Started by jamesmartinn‎, 11-30-2010 07:09 PM
    • Replies: 0
    • Views: 6,659
    11-30-2010, 07:09 PM Go to last post
  50. 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: 6,658
    01-12-2006, 12:31 PM Go to last post
  51. Probability practise

    An electrical system is set up such that power can get from the source to the switch if both parts A and B are working, if part C is working or if...

    Started by SadieKhan‎, 09-18-2010 05:29 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 6,657
    09-21-2010, 04:41 PM Go to last post
  52. Question Will rounding off Standard Deviation Bins cause error on Histogram?

    I am creating a Histogram. I have about 100 points of data and I am using MS Excel's Histogram function to create the "Bins". The data points I have...

    Started by andygarcia‎, 06-25-2010 10:04 AM
    • Replies: 4
    • Views: 6,650
    06-30-2010, 11:34 AM Go to last post
  53. "Hepatitis" and "Golf" probabilities.

    I'm having some trouble with these... A test for Hepatitis A is 98% accurate: if a person has Hepatitis, the test will come out "positive" with...

    Started by DAI&DF‎, 05-31-2008 11:29 PM
    • Replies: 7
    • Views: 6,649
    06-01-2008, 06:51 PM Go to last post
  54. problem with a Combination rule word problem

    I am having a little trouble finding the answer to this word problem If you drew three cards form a standard deck without replacement, what would...

    Started by David_langstaff‎, 11-02-2009 01:22 PM
    • Replies: 1
    • Views: 6,643
    11-02-2009, 02:13 PM Go to last post
  55. 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: 6,635
    01-25-2006, 11:22 PM Go to last post
  56. 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: 6,631
    10-14-2008, 02:16 PM Go to last post
  57. Textbook Problem. Calculate E(Y2/Y1)

    Joint Probability Density Function: f(y1, y2) = 1/8 * y1 * e^(-1/2 * (y1 + y2)) where 0 < y1 < infinity and 0 < y2 < infinity (0 otherwise) y1 + y2...

    Started by Giacomo‎, 10-12-2009 04:47 PM
    • Replies: 2
    • Views: 6,620
    10-13-2009, 11:30 AM Go to last post
  58. Probability problem

    Find the conditional probalilities of the indicated events when two fair dice (one red and one green) are rolled: The sum is 6, given that the...

    Started by Coral.ys‎, 10-02-2011 03:59 PM
    help me!, plese
    • Replies: 5
    • Views: 6,618
    10-02-2011, 05:12 PM Go to last post
  59. Game probability problem

    Two armies of n attackers and m defenders do battle. If n=1, then there is 1 attacking die; if n=2 there are 2 attacking dice; if n \geq 3 there are...

    Started by GameGod‎, 05-28-2013 06:39 PM
    3 Pages
    1 2 3
    • Replies: 34
    • Views: 6,610
    07-08-2013, 12:43 AM Go to last post
  60. Question Probability of a string containing a specific substring

    So I've been getting into concepts like the Library of Babel and infinite monkey theorem, and have been trying to work out how to calculate the...

    Started by Chris Morrow‎, 10-14-2011 07:39 PM
    infinite monkeys, library of babel, recursive functions, substrings
    • Replies: 1
    • Views: 6,607
    01-18-2012, 11:22 AM Go to last post

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