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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: 30,221
    09-30-2005, 09:44 AM Go to last post
  1. probability of spelling mistake

    Problem. It is found that a story book containing 200 pages contained on an average 2 spelling mistakes in every 10 pages. What is the probability...

    Started by seismo‎, 10-02-2012 09:03 AM
    • Replies: 2
    • Views: 1,667
    10-03-2012, 12:23 PM Go to last post
  2. probabilities in lottery

    Hi, Just an easy question, suppose I have 12 balls (numbered from 1-12), and I need to draw 2 balls out of the 12. But before doing that, I need...

    Started by rikari‎, 10-03-2012 06:24 AM
    • Replies: 1
    • Views: 1,140
    10-03-2012, 06:40 AM Go to last post
  3. Conditional probability density function, practical example

    Greetings to all the ones who are accepting to help people and greeting to the ones who are browsing in the forum! We have 2 independent random...

    Started by Baillya‎, 10-02-2012 03:44 AM
    • Replies: 2
    • Views: 4,823
    10-03-2012, 03:07 AM Go to last post
  4. Error in Calculating the Variance of X?

    Hello, I am solving the following problem: “A Salesman has scheduled two appointments to sell encyclopedias. His first appointment will lead to a...

    Started by S-C-3-1-3‎, 10-02-2012 02:00 AM
    • Replies: 6
    • Views: 2,332
    10-02-2012, 12:57 PM Go to last post
  5. Finding probability of left and right handed people

    Hello, I am lost on these problems: Assume that 13% of people are left-handed. If we select 10 people at random, answer the following questions: ...

    Started by dina786‎, 10-01-2012 06:14 PM
    • Replies: 11
    • Views: 8,996
    10-02-2012, 10:29 AM Go to last post
  6. Simple probability question

    Hi, I came across this probability question and found it kind of confusing: You shuffle a standard deck of cards and draw 22 cards. Given...

    Started by jessk‎, 10-02-2012 12:47 AM
    • Replies: 3
    • Views: 1,343
    10-02-2012, 10:25 AM Go to last post
  7. Please help! Nonindependent Random Variables

    Help please! I can't for the life of me even understand how to begin understanding this question. I haven't studied stats in like 6 years and my...

    Started by sudoku2009‎, 10-02-2012 12:24 AM
    • Replies: 2
    • Views: 1,762
    10-02-2012, 12:36 AM Go to last post
  8. [SOLVED] Pharmacy errors

    Hello, I am lost on these questions. Could someone please help me? What is the median number of prescriptions until the pharmacist makes the first...

    Started by dina786‎, 10-01-2012 06:11 PM
    • Replies: 6
    • Views: 2,658
    10-01-2012, 11:30 PM Go to last post
  9. Finding probability of passing test by guessing

    Hello, I am confused about this problem: There are 50 4 choice questions out of which at least 25 must be correct in order to pass. If a student...

    Started by dina786‎, 10-01-2012 06:04 PM
    • Replies: 2
    • Views: 4,722
    10-01-2012, 11:23 PM Go to last post
  10. Left and right handed seats

    I have tried to solve this problem in so many ways by using the binomial and normal distributions, none of which gave me the right answers. Here is...

    Started by dina786‎, 10-01-2012 06:07 PM
    • Replies: 0
    • Views: 1,518
    10-01-2012, 06:07 PM Go to last post
  11. Aproximate inference about a population/distribution

    Hello, I am sorry for how confusing this will be. I was reading a while back about making a determination about the probability of a variable in a...

    Started by joseclar‎, 10-01-2012 12:06 PM
    • Replies: 3
    • Views: 1,431
    10-01-2012, 03:41 PM Go to last post
  12. [SOLVED] Question

    I have a question. The question below asks me Calculate the probability the coin comes up heads at least one time.. So it becomes 1- 15!/15!0!...

    Started by PSG‎, 09-30-2012 10:11 PM
    • Replies: 3
    • Views: 1,630
    09-30-2012, 10:39 PM Go to last post
  13. Q-Q plots

    The assupmtion for a paired t-test is that the data follows a normal distribution. Given the 2 samples are before and after in nature do I...

    Started by pickslides‎, 09-30-2012 05:53 PM
    • Replies: 1
    • Views: 1,506
    09-30-2012, 05:56 PM Go to last post
  14. α = 0.05 vs p-value?

    So I've got a couple questions on my stats homework as follows: E. Canis infection is a tick-bone disease of dogs that is sometimes contracted by...

    Started by ryant‎, 09-29-2012 07:09 PM
    • Replies: 4
    • Views: 51,911
    09-30-2012, 04:51 AM Go to last post
  15. Difficulty setting up double integrals for Joint Distributions

    I'm struggling to set up the correct range when calculating probabilities of joint distributions....anyone have any recommended reading or sites that...

    Started by hedgie‎, 09-27-2012 02:17 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 8,975
    09-30-2012, 03:24 AM Go to last post
  16. Poisson Distribution question Help

    A Black mesh landscaping material is used to put over the ground and prevent weeds. Mulch is usually placed on top. There is on sale at a reduced...

    Started by Nellen2222‎, 09-29-2012 05:23 PM
    • Replies: 1
    • Views: 1,058
    09-29-2012, 09:42 PM Go to last post
  17. Probability, American airlines!

    North American Airlines, on average, delivers three quarters of their flights to the arrival gate within 15 minutes of schedule in august 2012. ...

    Started by Nellen2222‎, 09-29-2012 02:30 PM
    • Replies: 5
    • Views: 1,785
    09-29-2012, 04:49 PM Go to last post
  18. I'm confused about use of a Complement in determining binomial probability

    Hi, I'm working on some homework dealing with binomial probability of inequalities. The problem which has caused me some confusion is stated as...

    Started by AerospaceDoc‎, 09-29-2012 01:49 PM
    • Replies: 1
    • Views: 1,835
    09-29-2012, 04:39 PM Go to last post
  19. Cell phone mean and standard deviation

    A recent study "privacy and data management on mobile decies"the pew research center, Showed that 18.6% had their location tracking feature turned...

    Started by Neelo‎, 09-29-2012 02:57 PM
    • Replies: 5
    • Views: 2,645
    09-29-2012, 03:38 PM Go to last post
  20. Probability help solving problem

    A hopeful TV Talent Show contestant claims to be able to predict the result of tossing a coin. To check this out, a fair coin is flipped 24 times,...

    Started by Nellen2222‎, 09-27-2012 11:44 PM
    • Replies: 8
    • Views: 2,145
    09-29-2012, 02:24 PM Go to last post
  21. Probability Assignment Help!

    Q5) Your friend wants to play a game with you. You don't need pay anything to start the game. There is a box contain 20 balls. 10 are red and 10 are...

    Started by muqueet‎, 09-27-2012 02:32 AM
    • Replies: 3
    • Views: 1,482
    09-27-2012, 04:49 PM Go to last post
  22. Simple question about law of total prob. (multivariable)

    So I know that a joint distribution of 2 variables x1,x2 can be written as f(x1,x2) = f(x1)f(x2|x1) but what would happen if I have x1....xn...

    Started by c2q‎, 09-26-2012 04:09 PM
    • Replies: 3
    • Views: 1,236
    09-26-2012, 05:04 PM Go to last post
  23. Find Densities for Exponential Distribution

    I am given a general problem: Suppose that X1, ..., Xn is a sample from the Exponential(theta) distribution. Find the densities fx(1) and fx(n). ...

    Started by simplemts‎, 09-26-2012 01:02 PM
    • Replies: 9
    • Views: 2,201
    09-26-2012, 02:35 PM Go to last post
  24. probablility of a sampling giving a results

    Let's say I know the mean value of a population I do I calculcate the the probablity to find a different value for the mean after x amount of...

    Started by han_solo82‎, 09-20-2012 03:05 PM
    • Replies: 10
    • Views: 2,169
    09-26-2012, 11:09 AM Go to last post
  25. Prove binomial from Multinomial

    Suppose that (X1,X2,X3) ~ Multinomial(n,Theta1,Theta2,Theta3). Propve by summing the joint probability function that X1 ~ Binomial(n,Theta1). I...

    Started by simplemts‎, 09-25-2012 07:44 PM
    • Replies: 1
    • Views: 1,611
    09-25-2012, 08:22 PM Go to last post
  26. Predicting the chance of attendance for a given appointment time

    Hi I do work for a health screening programme that screens hundreds of thousands of diabetic patients every year to try to prevent blindness. ...

    Started by Renegade666‎, 09-25-2012 11:22 AM
    • Replies: 6
    • Views: 2,256
    09-25-2012, 02:57 PM Go to last post
  27. 2 statistical bioresearch problems

    Hello guys, I require your help in my research project. Problem 1: We are filtering a suspension of 1ml containing 1250 cells, through a...

    Started by Mandokir‎, 09-21-2012 03:28 AM
    • Replies: 11
    • Views: 2,769
    09-25-2012, 02:54 PM Go to last post
  28. 50-50 or just abusing the game?

    Hi my name is Oscar and I had a question that has been bugging me and some other friends. We cannot wrap our heads around something and we have our...

    Started by otterman‎, 09-22-2012 12:56 AM
    gambling
    • Replies: 9
    • Views: 2,214
    09-25-2012, 02:12 PM Go to last post
  29. Joint and conditional probability distributions and calculations

    Hi, I'm new when it comes to joint and conditional probability distributions and would be glad if someone could give me some hints on a problem. ...

    Started by PeterPan2009‎, 09-25-2012 08:30 AM
    • Replies: 4
    • Views: 1,294
    09-25-2012, 10:46 AM Go to last post
  30. Trouble understanding a specific Uniform transformation

    This is homework.... Q: The RV X has U~(0,1). Find the CDF of Y=max(X,1/2). I am struggling to set this up. I understand (I think) that...

    Started by hedgie‎, 09-23-2012 10:34 PM
    • Replies: 8
    • Views: 2,584
    09-25-2012, 09:16 AM Go to last post
  31. HELP! Multinomial coefficient

    Q1) Use the multinomial theorem to expand the following: 〖(x^1+x^2+x^3+x^4+x^5)〗^3 How to solve this using multinomial theorem in EXCEL! If...

    Started by muqueet‎, 09-25-2012 02:48 AM
    • Replies: 1
    • Views: 1,697
    09-25-2012, 05:02 AM Go to last post
  32. Find the cdf of a joint density of RV's

    This is a homework problem.... Joint density of RV X,Y is: f(x,y) = 2e^-(x+y) if 0<x<y; y >0 and 0 otherwise. Find the cdf of Z = X + Y:...

    Started by hedgie‎, 09-25-2012 01:58 AM
    • Replies: 0
    • Views: 1,417
    09-25-2012, 01:58 AM Go to last post
  33. Random Variables Continuous --- Prove that Fx,y(x,y) <= min(Fx(X), Fy(y))

    My instructor gave me a hint of the following: A = ; B = ; then the joint cdf satisfies F(x,y) = P = P (A Intersect B) I'm not wrapping my...

    Started by simplemts‎, 09-24-2012 07:42 PM
    • Replies: 4
    • Views: 1,850
    09-24-2012, 08:16 PM Go to last post
  34. Conditional Probability using Bayes' Theorem

    Hello, I am trying to solve this conditional probability question: A certain college has observed that 20% of its freshmen are unqualified and drop...

    Started by S-C-3-1-3‎, 09-23-2012 10:36 PM
    • Replies: 8
    • Views: 5,746
    09-24-2012, 02:33 PM Go to last post
  35. Consequences of choosing the wrong likelihood function...

    hey everyone! just a quicky-quick question here. i think i remember reading somewhere that some of the nice properties of parameter estimates...

    Started by spunky‎, 09-20-2012 02:49 PM
    2 Pages
    1 2
    • Replies: 26
    • Views: 7,538
    09-23-2012, 12:17 PM Go to last post
  36. Simple Probability problem

    Hello, First time user, long time visitor. I am hoping someone can and is willing to help me. I am stuck on this two part problem. It seems...

    Started by ball‎, 09-21-2012 01:37 PM
    • Replies: 3
    • Views: 2,181
    09-23-2012, 11:49 AM Go to last post
  37. Probability question(Dumplings!!)

    I have another one. Just wanna see if im doing it rght. At a large Dim Sum restaurant they continually bring carts around with different dim sum...

    Started by Neelo‎, 09-22-2012 06:35 PM
    • Replies: 2
    • Views: 1,581
    09-22-2012, 08:24 PM Go to last post
  38. [SOLVED] Probability problem help(how to do)

    A gardener has a bag with 12 wildflower seeds saved from wildflowers in summer. She plants 4 of them at random in a pot to see if they will grow...

    Started by Neelo‎, 09-22-2012 05:53 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 3,247
    09-22-2012, 08:21 PM Go to last post
  39. Probability question!(help on solving!)

    A group of 5 co-workers, Tim, Harry, Nina, Brad and Pam contributed to buy a raffle tickets. They won a set of three tickets to an upcoming concert....

    Started by Devin‎, 09-22-2012 06:32 PM
    • Replies: 1
    • Views: 1,386
    09-22-2012, 06:45 PM Go to last post
  40. Bernoulli Random variable and population problems - i need it for an exam

    Let Ya and Yb denote Bernoulli random variables from 2 different populations, denoted a and b. suppose that E (Ya)= Pa and E (Yb) = Pb. A random...

    Started by homalina‎, 09-22-2012 03:29 PM
    • Replies: 1
    • Views: 3,731
    09-22-2012, 03:34 PM Go to last post
  41. judges

    A panel of judges is comprised of 5 women and 3 men. On a particular ruling, the 5 women voted in favor of the defendant and the 3 men voted against...

    Started by Shaq's Left Nut‎, 09-21-2012 02:57 PM
    • Replies: 2
    • Views: 1,521
    09-21-2012, 05:28 PM Go to last post
  42. Sampling w/out Replacement problem

    I can solve with replacement, but without has me stumped: So there's a bag with 100 nuts in it. 20 walnuts 30 macadamias 50 cashews If...

    Started by Shaq's Left Nut‎, 09-21-2012 11:35 AM
    • Replies: 3
    • Views: 1,356
    09-21-2012, 01:32 PM Go to last post
  43. Standard normal distribution

    Can someone please help me answer this Q with workings so I learn? Using a survey in winter 2009, it was estimated only 1% of households have...

    Started by kstone‎, 09-19-2012 09:29 PM
    distribution, normal, probability, standard
    • Replies: 4
    • Views: 1,499
    09-20-2012, 10:29 PM Go to last post
  44. A question about the distribution of random numbers - PART II

    Thanks to BGM and Dragan, my problem posted under the thread " A question about the distribution of random numbers" now appears to be solved! The...

    Started by BigBugBuzzz‎, 09-20-2012 08:59 AM
    • Replies: 7
    • Views: 1,543
    09-20-2012, 05:12 PM Go to last post
  45. A question about the distribution of random numbers

    Suppose I have two independent random variables A, and B, which are distributed Normally as follows: A: N~(MA,VA) B: N~(MB,VB) Now consider...

    Started by BigBugBuzzz‎, 09-18-2012 09:06 AM
    3 Pages
    1 2 3
    • Replies: 30
    • Views: 5,719
    09-20-2012, 08:35 AM Go to last post
  46. Probability of an event after combining (Union) two sample spaces

    Can anybody help me how to solve the following problem. Suppose we have an event x and two sample spaces s1,s2. let the probability of x is 0.3, 0.4...

    Started by saleem‎, 06-23-2011 09:20 PM
    probability question
    • Replies: 9
    • Views: 5,321
    09-20-2012, 01:25 AM Go to last post
  47. Is this correct?

    What is the probability that if a single student is randomly selected they would have a GPA greater than or equal to 3.0 or be taking at least 8...

    Started by PSG‎, 09-19-2012 06:43 PM
    • Replies: 4
    • Views: 1,725
    09-19-2012, 07:44 PM Go to last post
  48. Probability of multiple tags on a sea turtles pinging within an hour

    There are 7 sea turtles each with a pinging tag on it. Turtle 1: 52% of an hour tag is pinging Turtle 2: 52% of an hour tag is pinging Turtle 3:...

    Started by dcrear‎, 09-06-2012 11:41 PM
    • Replies: 2
    • Views: 1,724
    09-18-2012, 02:39 PM Go to last post
  49. Probability of scrabble game based on scores

    How do i calculate the probability in a scrabble game based on scores. Lets say Player A has 42 score and Player B has 90. How do i calculate the...

    Started by catvsrat‎, 09-18-2012 11:57 AM
    probability, scores, scrabble
    • Replies: 1
    • Views: 1,416
    09-18-2012, 01:54 PM Go to last post
  50. model conversion events

    When a web site visitor purchase a product, this event is called a conversion. I would like to know how to model such conversion events. What methods...

    Started by aha123‎, 09-18-2012 02:04 AM
    • Replies: 1
    • Views: 1,249
    09-18-2012, 10:23 AM Go to last post
  51. Conditional probability question

    Hi there, I have the journey times of 2 journeys. Would somebody be able to show me by way of example how to calculate the conditional...

    Started by bradyj2‎, 09-18-2012 09:26 AM
    • Replies: 0
    • Views: 975
    09-18-2012, 09:26 AM Go to last post
  52. Game Theory Question

    Hello gurus, I got involved in a debate with my sister this evening, and despite (what I thought) was a relatively simple problem, I couldn't...

    Started by BennyH26‎, 09-17-2012 09:18 PM
    game theory, independent events, odds, probability
    • Replies: 2
    • Views: 1,599
    09-17-2012, 10:37 PM Go to last post
  53. Question

    The terms "at least" as well as "or" I know they have their roles to play. Or means, "either one or the other, or both" And the term "At Least"...

    Started by PSG‎, 09-15-2012 12:43 PM
    • Replies: 2
    • Views: 1,193
    09-17-2012, 01:04 AM Go to last post
  54. Unhappy Intro to Probability question!

    Let C1 & C2 be independent events with P(C1) = 0.6 & P(C2) = 0.3 Compute P(C1 U C2complement) :wave: thank you!

    Started by echern3‎, 09-15-2012 08:59 PM
    • Replies: 1
    • Views: 1,381
    09-15-2012, 09:08 PM Go to last post
  55. Solving for a RV as a function of iid RVs

    Hi folks, I'm not a probability theory guy (economics PhD student), but I've recently gotten interested in networks and I've set up a model that I...

    Started by Reploid‎, 09-07-2012 08:34 PM
    • Replies: 1
    • Views: 1,958
    09-15-2012, 03:08 AM Go to last post
  56. Interesting ways to generate a random normal deviate

    I was thinking of ways to generate a random normal observation from a single random uniform(0,1) observation. I have at least 3 interesting ways in...

    Started by Dason‎, 02-03-2012 02:04 AM
    • Replies: 1
    • Views: 2,134
    09-15-2012, 02:41 AM Go to last post
  57. Inequalities between random variables

    Hi guys, I have the following question: Assuming that X and Y are two independent discrete random variables and Pr(X <= Y) is known how easily...

    Started by Bogdan‎, 09-13-2012 03:07 AM
    • Replies: 2
    • Views: 2,352
    09-15-2012, 02:11 AM Go to last post
  58. Some Help Please

    What is the difference from these 2 problems? They seem to be the same thing but they are different. For the one I got 4/51... That is because I did...

    Started by PSG‎, 09-14-2012 06:52 PM
    • Replies: 2
    • Views: 1,537
    09-14-2012, 07:06 PM Go to last post
  59. Question on independance

    I am having trouble understanding independence. I understand the basic formulas, but I had some additional questions: -Can you have you apply the...

    Started by parkand‎, 09-11-2012 06:42 PM
    • Replies: 1
    • Views: 1,189
    09-14-2012, 03:50 AM Go to last post
  60. Bayes theory interview question.

    This question is a typical interview question at a job I am currently seeking. The reason I am posting it is I have had different answers from...

    Started by ntyris9‎, 09-12-2012 05:22 PM
    • Replies: 3
    • Views: 7,509
    09-12-2012, 08:45 PM Go to last post

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