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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: 30,222
09-30-2005, 09:44 AM
1. ### Challenge

E1,E2,....,En are events; P is the probability that at least one of them occurs. a)show that SUM P(Ei)-SUM{i<j}P(EiEj) <= P<= SUM P(Ei) ...

• Replies: 2
• Views: 2,722
09-14-2010, 01:33 PM
2. ### Challenge: Card drawing probability

Hello everybody, This is my first post because this has been in my head and I couldn't hold it any longer! So here it goes: A friend of mine...

• Replies: 4
• Views: 1,565
05-10-2016, 06:32 AM
3. ### 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...

• Replies: 2
• Views: 4,077
03-03-2006, 01:37 AM
4. ### Challenging probability question

Hello, I have this question, I need some help with it. In an urn there are 10 balls marked with the numbers 1-10. 4 balls are being chosen...

• Replies: 4
• Views: 2,606
BGM
12-24-2012, 03:32 AM
5. ### Challenging probability question (expectation of iterative uniform integer)

" You start with a number x_0. Let R(x_s) be a random integer drawn uniformly from {0,...,x_s-1}. We now play a game where we draw x_1=R(x_0). If...

• Replies: 4
• Views: 1,585
11-10-2012, 05:59 PM
6. ### Chance level binomial, not 1/n

I have some data which I am going to performed a mixed ANOVA on, however, I think I might need to transform the raw data, but am not sure how to. ...

• Replies: 5
• Views: 3,934
08-10-2010, 09:43 AM
7. ### Chance of an Occurance

ok, I am an accountant, not a statistician. Something happened to me personally and I would like to figure out the probability that it would have...

• Replies: 8
• Views: 2,963
07-30-2013, 11:49 PM
8. ### Chance of Beating the House In Roulette

Hi, I was wondering how I could calculate this. I tried two different methods and got the same answer, but I'm not sure if I'm attacking the problem...

• Replies: 1
• Views: 2,139
05-20-2013, 11:55 AM
9. ### Chance of winning - question

Hi, I have not figured out how to solve the following questions: 1. Report the chance that Bears wins at least 6 games this year. 2. Compute...

• Replies: 2
• Views: 1,708
07-28-2011, 02:34 PM
10. ### Chance/probability

Hi everyone! This is my first post here, so I'm hoping you guys could help. I'm having some difficulty with this problem: A pharmeceutical company...

• Replies: 2
• Views: 3,505
03-21-2011, 06:30 PM
11. ### chances of going first in.. pokemon??!

ha did the title draw you in? good, cause this is a tricky one. you don't need to know much of anything about Pokemon cards to solve this problem. ...

• Replies: 3
• Views: 1,836
11-28-2012, 05:46 PM
12. ### change of variable help

1. Let X~Geometric(1/4), and let Y have probability function: pY(y)= 1/6 if y=2 1/12 if y=5 3/4 if y=9 0 otherwise Let W=X+Y. Suppose X and...

• Replies: 1
• Views: 2,431
11-01-2010, 07:53 PM
13. ### Change variable PDF with less variables than before

My question is very simple, I have a probability density function that depends on four variables p(x1,x2,x3,x4). Now each of those variables depend...

• Replies: 0
• Views: 1,113
01-18-2016, 04:02 PM
14. ### Changing the units changes the scale and shape of Weibull pdf?

I don't know how to delete the post.:(

• Replies: 0
• Views: 1,137
05-24-2013, 06:14 PM
15. ### Characteristic function of the Gamma distribution

I have not been able to find anywhere a rigorous derivation of the characteristic function of the Gamma distribution. Any suggestions?

• Replies: 3
• Views: 16,123
11-18-2011, 03:41 AM
16. ### characterization of multivariate normal distribution by covariances

Hi, the professor told us that a multivariate normal distribution can be characterized as the only distribution for which zero covariance implies...

• Replies: 3
• Views: 3,583
07-30-2011, 06:50 AM
17. ### chebishev

1) a dice is being rolled 360 times. the dice has 1 red side and 5 black. what is the upper bound to the probability of falling on a red side more...

• Replies: 0
• Views: 1,511
07-22-2009, 03:27 PM
18. ### Chebshev Inequality

Hi! I have the following problem: Suppose X ~ Poisson (Lambda). Show P(X > 2lambda) =< 1/lambda So I wrote out Chebshev's by definition: ...

• Replies: 0
• Views: 2,414
10-27-2010, 03:30 PM
19. ### Chebyshev's Inequality

We recently had a test question (that I got counted correct) but which I feel like my answer is inadequate. We were told to use the Chebyshev's...

• Replies: 2
• Views: 3,794
10-23-2010, 08:37 PM
20. ### Chebyshev's inequality and Error bound

The question -------- Hello everyone.

• Replies: 1
• Views: 3,585
BGM
04-07-2011, 06:15 AM
21. ### Chebyshev's Inequality problem

Let X ~ Poisson (lambda). With Chebyshev's Inequality, show that P(X >=2 lambda) <= 1/lambda The way I thought to interpret this theorem was...

• Replies: 9
• Views: 2,539
09-27-2016, 09:46 PM
22. ### Chebyshev's theorem and empirical rule

can someone please explain how to do this problem? I am so confused! Assume the distribution of weights of US adults are normally distributed...

• Replies: 5
• Views: 11,048
12-10-2008, 02:04 PM

hey could you guys tell me if i got these correct because there are some I'm unsure on the method thanks :wave: X-Exp(0.3) then find P(X>15|X>10)...

• Replies: 6
• Views: 3,579
05-13-2010, 04:15 AM
24. ### 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...

• Replies: 3
• Views: 6,831
01-17-2011, 03:11 PM
25. ### chess probability question

Hello, This question is taken from Ross' a first course in probability chapter 2. It is question 17. Here it is: If 8 rooks are randomly...

• Replies: 4
• Views: 8,657
05-06-2008, 12:28 PM
26. ### Chi Square Test-Who's correct? Me or Prof

You are instructed to prepare 3 different types of pastry, all containing 16 blueberries per pastry. 6 customers approach you to complain that there...

• Replies: 1
• Views: 3,188
10-20-2011, 05:25 PM
27. ### Chi Squared : Explaining the numbers

Hello! Thank you in advance for your help and I hope I have posted this in the correct section. My question involves verbally explaining chi...

• Replies: 2
• Views: 4,386
04-11-2012, 02:49 AM
28. ### Chi squared probability

If W/4 ~ Chi-Squared with some degrees of freedom and hence we find that: P(a/4 < W/4< b/4 ) = 0.056 then is it correct to say that:...

• Replies: 1
• Views: 1,905
01-02-2014, 11:42 PM
29. ### 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: 9,521
02-18-2012, 05:50 PM
30. ### Chi-Square Test

Hi guys, Was hoping that someone can help me with a Chi-Square test I'm attemtping. I understand the mechanics of the test and how to...

• Replies: 9
• Views: 4,970
06-09-2009, 07:23 AM
31. ### Chi-squared and T distribution, just need a check

These problems where review from a prior class, i think they are correct but not positive. Q1. Using the T distribution, find the following and...

• Replies: 1
• Views: 2,022
BGM
08-31-2011, 12:03 PM
32. ### Children Gender Split Probability Question

Hello everyone, I've another question on probability (: A randomly chosen family has 4 children. Assume that the chance of having a son or a...

• Replies: 1
• Views: 4,156
09-30-2010, 10:02 AM
33. ### CHI^2 test for binomial variables which are not normally distributed

Hello, Assume that you have X_1\cdot X_n independant random variables. If they are normally distributed we can use the Chi^2 statistical test to...

• Replies: 0
• Views: 886
CBW
06-10-2015, 07:59 AM
34. ### Chi² distribution link with standard normal distribution?

Hello, The chi² distribution is the sum of n random standard normal variables. It's used for example to know if a distribution fits the uniform...

• Replies: 4
• Views: 1,658
04-30-2017, 04:26 AM
35. ### Choice probability

I need to calculate the binary choice probabilty of 2 alternatives i and j- Each of the alternative is charectarised with a part of measurable and...

• Replies: 1
• Views: 2,424
BGM
08-31-2011, 11:59 AM
36. ### choosing the right distribution

I am in a queueing networks class. From what I have read so far, the distributions of the arrival patterns and service patterns need to be...

• Replies: 0
• Views: 2,873
09-04-2009, 06:51 PM
37. ### Christmas Present Problem

May be this is a simple problem for the professionals but its driving me mad. Here is the problem: At Christmas time a group of people at work,...

• Replies: 10
• Views: 3,101
01-17-2008, 02:01 PM

in the game chuck-a-luck, three dice are rolled. A player bets a certain amount (say $1) on a number from one to six. If the number appears on one... • Replies: 0 • Views: 3,831 10-04-2006, 11:23 PM 39. ### circuit failure A message is transmitted using a binary code of 0's and 1's. Each transmitted bit (0 or 1) must pass through three relays before reaching a receiver.... • Replies: 1 • Views: 4,437 09-11-2007, 12:17 AM 40. ### circular permutation Hello: I have a probability problem I would like some takes on, please. "There are 5 boys and 3 girls sitting around a circular table. What is... • Replies: 5 • Views: 4,383 08-17-2006, 09:41 AM 41. ### CJD problem In a large corporation, people over age 30 have an annual income whose distribution can be approximated normally ~ ($60K, $100,000,000) with SD =... • Replies: 7 • Views: 3,211 BGM 11-14-2010, 08:19 AM 42. ### Classical Probability Greetings from new comer! Here is my question I could not figure it out by myself: There are two types of bags H and R in a single box (black box... • Replies: 5 • Views: 2,406 10-06-2011, 08:09 PM 43. ### Classical Probability and Relative Frequency Probability Approach As classical Probability uses mathematical formula for calculation and events are equally likely. As I know Binomial distribution is used for... • Replies: 0 • Views: 5,330 01-15-2013, 10:11 AM 44. ### classical probability question... Hello to all experts, I need help with this, I am lost... A manager of an IT company gives randomly 8 projects to 4 teams, with equal... • Replies: 1 • Views: 2,612 01-16-2011, 02:51 PM 45. ### classification of probability distributions Hi, I wonder if there is a classification of probability distributions or so called 'controlled vocabulary' or 'ontology'? So far I could find... • Replies: 0 • Views: 2,279 08-29-2012, 11:48 AM 46. ### Closed form formula for the non central moments of normal distribution? What is the formula for the nth non-central moments of the normal distribution. • Replies: 1 • Views: 4,162 01-25-2014, 08:50 PM 47. ### Closing Difference between two numbers with confidence limits. Company A tested its widgets and found that when they tested 10000 of them, 2010 of them failed. They tested the widgets of their competition but... • Replies: 0 • Views: 1,040 10-17-2014, 02:26 PM 48. ### Clt This seems like it should be easy but for some reason, I'm not seeing it. Suppose we pick at random and independently 100 numbers in the interval ... • Replies: 0 • Views: 1,710 08-04-2009, 02:45 PM 49. ### CLT problem Let X_1,X_2,...X_n be a sequence of independent random variables. Suppose for k=1,2,3,.... P(X_{2k-1}=1)=P(X_{2k-1}=-1)=\frac{1}{2} and the pdf of... • Replies: 2 • Views: 3,049 01-26-2011, 01:59 AM 50. ### cluster Hi there, Suppose I have some variables (among others of several types) measured in likert scale and need to cluster my data according to these... • Replies: 1 • Views: 2,897 01-29-2010, 10:17 PM 51. ### Clustering in SPSS Hi, This forum has been of great help so far. THANKS. I have another question.:p I have some 170 cases which I want to classify according... • Replies: 4 • Views: 3,380 08-18-2010, 04:36 PM 52. ### Coin A Coin B Coin A is flipped 3 times and coin B 4 times. What is the probability that the number of tails obtained from flipping the 2 fair coins is the same? • Replies: 4 • Views: 2,748 10-11-2006, 11:11 AM 53. ### Coin and die probability If I repeatedly and alternately toss a coin and roll a 6 sided die beginning with the coin what is probability of getting a head before a 6 • Replies: 6 • Views: 1,506 BGM 02-16-2016, 01:38 PM 54. ### Coin Filpping Probability I am trying to review for a test for my Probability course. This question is on myu review and I was wondering if anyone could help me with it? ... • Replies: 1 • Views: 2,693 04-16-2009, 01:12 PM 55. ### Coin Fliipping or Rats at Vertices I'm aware that if you play the coin flipping game where the winner is the first to get a head the player who goes first has a 2/3 chance of winning.... • Replies: 1 • Views: 1,952 BGM 04-01-2012, 02:01 PM 56. ### Coin Flip and calling randomly If there is a coin flip contest and there is a coin flipper continuously flipping the coin and there are three contestants 1. Always Calls Heads... • Replies: 5 • Views: 1,596 03-10-2014, 08:47 AM 57. ### Coin flip explanation Hi, I have been wondering about a probability question. Suppose you have a 50% chance of winning$1 when you flip a coin. You also have a 50%...

• Replies: 1
• Views: 1,184
BGM
04-06-2016, 04:07 AM

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