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# Forum: Probability

Probability course and homework discussion. Probability distributions. Probability theory, stochastic processes

1. ### 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)...

• Replies: 0
• Views: 30,399
09-30-2005, 09:44 AM
1. ### To use binomial or not to use binomial?

"For fans who visit the celebrity facebook page, 15% will click the ad on the page. Each click on the ad link will generate a \$0.05 income. For a...

• Replies: 3
• Views: 1,560
BGM
02-29-2012, 05:49 AM
2. ### 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...

• Replies: 1
• Views: 2,000
BGM
02-29-2012, 05:42 AM
3. ### Probability of a team making the finals

Hi, I am trying to find how to calculate the probability of "x" number of events happening within "y" opportunities. However each opportunity has...

• Replies: 7
• Views: 2,028
02-28-2012, 09:36 PM
4. ### Request for help developing a commercial solution

Firstly, I apologise if I am in the wrong place. In a business context we need to produce a model to help planning tasks. We are a small commercial...

• Replies: 0
• Views: 1,333
02-28-2012, 12:02 PM
5. ### A self study question for extreme probability....Gaming-Cards.

No, this does not have to do with any current games on the market.... I have a unique question for anyone that can explain it to me. I'm a bit of a...

• Replies: 3
• Views: 1,724
02-28-2012, 11:54 AM
6. ### decimal answer need for probability

Happy Meal Problem: McDonalds offers a little toy with its happy meals. They have 5 different toys and each toy has the same probability of appearing...

• Replies: 9
• Views: 3,260
02-28-2012, 08:39 AM
7. ### Moment Generating Function of Z

Let X1,X2,... be a sequence of iid uniform random variables in , i.e. Xi ∼ U(0, 1) Let N be a random number which has the probability mass...

• Replies: 0
• Views: 1,931
02-28-2012, 08:38 AM
8. ### Drug Reaction Probability

In a clinical test of the drug Viagra, it was found that 4% of those in a placebo group experienced headaches. Assuming that the same 4% rate applies...

• Replies: 6
• Views: 6,284
02-27-2012, 11:15 PM
9. ### I need help with homework please.

The teacher just kind of highlights the basics of it and tells us to read the chapter but the book makes absolutely no sense whatsoever. If someone...

• Replies: 1
• Views: 5,197
02-27-2012, 10:20 PM
10. ### Probability (compound event)

Question: the event A&B are such that P(A)= x+.2 P(B)= 2x + .1 P(AnB)=x a) Given that P(AuB)= .7 find the value of x OK I DON'T EXPECT ANYONE...

• Replies: 12
• Views: 2,708
02-27-2012, 07:56 PM
11. ### Probablity with mean and standard deviation

Assume that birthweights are normally distributed with a mean of 3400 g and a standard deviation of 700 g. • Find the probability of a...

• Replies: 1
• Views: 2,487
02-27-2012, 07:16 PM
12. ### Mysterious probability problem

t's a case from the book talks about Otitis media- infection of the middle ear- in infants population. the number of sample is 2500 infants. i/m ...

• Replies: 0
• Views: 1,718
02-27-2012, 01:41 PM
13. ### Empirical Rule of 68-95-99.7 vs. Corresponsing probability from Z-table

The Empirical Rule states that "Assuming the population exhibit a normal (bell-curved) distribution, about 68.27% of the values lie within 1 standard...

• Replies: 2
• Views: 4,485
02-27-2012, 01:17 PM
14. ### Probability for functional combination of normal distributed random variable

Hey folks, i am searching for a method to get the probability of a functional combination of normal distributed random variables, here is an...

• Replies: 12
• Views: 3,611
02-27-2012, 12:43 PM
15. ### ratio data and chi-squared test

Hello I have a data composing of S and W type. Originally I used paired t-test to examine if S>W. (H0: S>W, Ha: S=<W, one-tailed) Now I...

• Replies: 0
• Views: 1,654
02-27-2012, 12:49 AM
16. ### Can anybody correct me please?!!

Here is a question that I came across and I answered it, but I’m not sure about it. Three drugs are selected at random, and each is categorized as...

• Replies: 0
• Views: 1,354
02-26-2012, 08:21 PM
17. ### need help in probability problem

Hi all, I'm practicing some probability problems and I got a homework couldn't understand a problem in here The problem is: Anew digital scale...

• Replies: 4
• Views: 1,936
02-26-2012, 02:35 PM
18. ### coin toss

I have a coin that lands heads with probability p1; you have a coin that lands heads with probability p2. I toss my coin until I get a head. Each...

• Replies: 8
• Views: 3,463
02-26-2012, 05:35 AM
19. ### Find Maximum Likelihood Estimator of Gamma Distribution

Find Maximum Likelihood Estimator of Gamma Distribution Given: f(x; β) = * x * e^(-x/ β) for 0 < x < infinity EX = 2β and VarX =...

• Replies: 0
• Views: 4,841
02-25-2012, 08:03 PM
20. ### Can anybody help please!!

I'm studying probabilities and I came across the following problem. It's actually answered in the book but I couldn't really figure it out. ...

• Replies: 0
• Views: 1,777
02-25-2012, 07:28 PM
21. ### probability

ok so the question says; find the probability that exactly two heads appearing in two tosses of a fair coin............... is the answer a half???...

• Replies: 1
• Views: 2,275
02-24-2012, 11:26 PM
22. ### Probability Homework(2)

The deeper i go into the probability chapter, the more confused i get :(, here are sum questions. they might be really easy but i'm not getting them....

• Replies: 9
• Views: 16,967
02-24-2012, 11:19 PM
23. ### Moment Generating Function

If the joint moment generating function of X and Y is M X,Y (t1, t2) = 6 / (1-t1) * and X,Y are the times that required for two tasks to be...

• Replies: 16
• Views: 5,778
02-23-2012, 01:13 PM
24. ### Feedback sought on finding a probability based on a permutation / binomial D

Hi everyone, I've just signed up and I'm posting this here (and not in the other probability section) since it's not a course or homework problem....

• Replies: 3
• Views: 2,365
02-22-2012, 04:50 PM
25. ### 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...

• Replies: 2
• Views: 1,776
02-22-2012, 04:14 PM
26. ### Combining 2 transitional probability matrices?

Hello, How would you/or is it possible to combine two transitional probability matrices? Say for example I have 2 matrices that both measure...

• Replies: 7
• Views: 2,126
02-22-2012, 07:21 AM
27. ### 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...

• Replies: 4
• Views: 2,842
02-21-2012, 06:40 PM
28. ### Normal Approximation to the Binomial..help please

Hi, The question I need to solve is: Suppose that a short quiz consists of only 10 True/false questions. Find the probability of a student...

• Replies: 2
• Views: 1,657
02-21-2012, 04:41 PM
29. ### Categorizing a question: binomial OR normal OR normal approx. of binomial.

*************Please ingore this question************ *********It's actually a 'Distribution of the Sample Means' question******* What...

• Replies: 0
• Views: 2,119
02-21-2012, 02:41 PM
30. ### particle representation of a distribution

hi, I stumbled upon the 'particle representation of a distribution' but couldn't find a propoer definition of it. What is it used for? Any comments...

• Replies: 2
• Views: 2,105
02-21-2012, 08:30 AM
31. ### States of a Markov Chain question?

Hello all, I would be grateful if somebody could advise me or comment on a Markoc Chain question that I have. It is with regards to the state...

• Replies: 0
• Views: 1,348
02-21-2012, 07:36 AM
32. ### Any suggestions on how to figure out these two problems????

Im getting frustrated because....I have been looking through my textbooks and notes trying to figure out how to set these two problems up...Can...

• Replies: 1
• Views: 4,678
02-19-2012, 05:47 PM
33. ### conditional normal distribution

dear all, i have the following question that i don't get my head around. suppose x1 and x2 are jointly normally distributed. i am interested in...

• Replies: 1
• Views: 3,986
BGM
02-19-2012, 04:51 PM
34. ### The Dice Game

Hello everyone, I want to ask questions about my task. Below are the description. Thank you in advance. Kind regards, Kirman. The aim...

• Replies: 3
• Views: 5,305
02-19-2012, 01:38 PM
35. ### Probability different colored balls picked without replacement "at least one of each"

Hello everyone. I am a hobby programmer working on a cool new project. I've always loved probability and always wanted to write a program using it...

• Replies: 7
• Views: 10,043
02-19-2012, 07:38 AM
36. ### 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...

• Replies: 7
• Views: 9,625
02-18-2012, 05:50 PM
37. ### Statistical Analysis - Maximum Likelihood Fit

Hi, I have a data sample from an experiment. the data is a list of times in days each indicatiing a detection event from a particle detector. After...

• Replies: 2
• Views: 2,020
02-18-2012, 06:04 AM
38. ### Calculating Probability of Cyber Attack Data

Folks, need some help, maybe this question is incomplete and needs more data but let me know if thats the case as well: I have a tool that...

• Replies: 0
• Views: 4,390
02-17-2012, 08:42 PM
39. ### Binomial Random Variable Help

Hey everyone! I'm struggling with this question: Let x be a binomial random variable and suppose n= 20, p=0.5. Then P(μ-σ ≤ x ≤ μ+σ) is: i...

• Replies: 1
• Views: 2,331
02-17-2012, 07:34 PM
40. ### geometric prob

hey there, I have a question. X is geometric random variable ~G(1/2) the question: calculate E( (5/4)^x ) = ? Thanks, Jim.

• Replies: 9
• Views: 2,610
02-17-2012, 11:08 AM
41. ### Probability

if a baseball manager has 5 pitchers and catchers, how many different possible pitcher-catcher combinations can he field?

• Replies: 3
• Views: 2,792
02-16-2012, 04:51 PM
42. ### propability problem

Charlie and Lora are having a mud fight trying to the other one's sand castle. This is achieved as soon as all towers have been destroyed.CHarelie's...

• Replies: 1
• Views: 1,436
02-16-2012, 10:08 AM
43. ### hypergeometric distribution problem

Hi I'm having a hard time finding the solution to the following problem: Any ideas, tips or anything that will guide me in the right direction...

• Replies: 6
• Views: 2,571
BGM
02-15-2012, 11:56 AM
44. ### Calculate Prob's using multiple means and std dev's

Hi all. My first post. I'm trying to find a correct methodology for a problem and am a bit stumped as I don't really know how to frame it in a...

• Replies: 4
• Views: 2,595
02-15-2012, 09:03 AM
45. ### Question - Having a hard time figuring this out

USA Today reported that "high-volume" hospitals performed 77% of bladder removal surgeries, and the rest were performed in "low-volume" hospitals....

• Replies: 4
• Views: 2,149
02-15-2012, 03:41 AM
46. ### Request: Exams(CS109)

hi, im studying for an exam in Introduction for Probability to CS.. does anyone have past exams of CS109 from Stanford/ similiar courses at...

• Replies: 2
• Views: 2,830
02-14-2012, 07:09 PM
47. ### Dirichlet distribution - moments (mean and variance)

For a Dirichlet variable, I know the means and covariances, that is, E = \alpha_i/\alpha_0 Cov =\frac{ \alpha_i (\alpha_0 I -...

• Replies: 12
• Views: 11,862
02-14-2012, 10:56 AM
48. ### Probability distribution function for extracting b balls out of a urn.

Hello everybody, First of all I would like to say that I am not a student trying to get his homework solved. Rather I am a software developer...

• Replies: 4
• Views: 3,909
02-14-2012, 10:09 AM
49. ### Sum of Poisson Distribution

Hi everyone. Let X and Y be independent, with X~Poi(lambda) and Y~Poi(mu). Put Z = X + Y as their sum. Find the distribution X | Z = z.

• Replies: 8
• Views: 19,452
02-13-2012, 07:50 PM
50. ### 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...

• Replies: 1
• Views: 7,069
02-12-2012, 02:55 PM
51. ### I don't understand the solution

Two cards are drawn with replacement from a standard deck. >> -Given there is at least one king drawn, what is the probability both >> cards are...

• Replies: 1
• Views: 1,614
BGM
02-12-2012, 01:13 PM
52. ### Probability of floods

Hi, I was arguing with a friend of mine that people cannot make rational expectations when it comes to expecting a true probability of some events....

• Replies: 0
• Views: 991
02-11-2012, 12:09 PM
53. ### Defining parameter following survival function

I am a newbie, with limited statistical skills, so please excuse/correct basic mistakes. My question is about the characteristics of a...

• Replies: 5
• Views: 1,791
BGM
02-09-2012, 02:10 PM
54. ### Comparing 2 continuous uniform distributions

I have what appears to be a very simple problem, but am having difficulties working out a solution. Any help would be much appreciated. The...

• Replies: 1
• Views: 3,075
BGM
02-09-2012, 02:02 PM
55. ### 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...

• Replies: 17
• Views: 8,359
02-08-2012, 04:30 PM
56. ### Poison -concept check

Hi, I'm doing some practice questions for my upcoming test. 1.If there is no fixed-upper limit vlaue for the Poisson random variable,X does this...

• Replies: 1
• Views: 1,501
BGM
02-08-2012, 01:22 PM
57. ### Standard Deviation

Please help me with this problem. Also, is there a way to calculate this in Excel? A National study has determined that people who work full time...

• Replies: 2
• Views: 2,701
02-07-2012, 11:17 PM

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