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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: 30,353
09-30-2005, 09:44 AM
1. ### probabilities

I am german and I have some difficulties understanding some terms. I have a homework in reference to probabilities. Please help me with the formula....

• Replies: 3
• Views: 2,722
07-06-2008, 06:02 PM
2. ### probability of exceedence

Hi all, I'm new here, but I have a problem I can't figure out. I have wave height data from the past 13 years and I fitted the data with a...

• Replies: 0
• Views: 3,119
07-07-2008, 09:42 AM
3. ### Sample mean and variance of dependent random variables

The sample mean and variance of independent random variables are mean = E(X) variance = Var(X)/n What if the random variables are dependent? ...

• Replies: 1
• Views: 13,463
07-10-2008, 03:57 AM
4. ### Comparing CDFs using Chi squared?

HI, I have a set of data from which I can construct the cumulative distribution function. I then compare this contructed CDF with the CDFs of a...

• Replies: 3
• Views: 4,634
07-10-2008, 07:44 AM
5. ### Probability of Amino Acid Sequence

I need to predict the frequency of a certain chain of amino acids occurring by chance. Sequence: N - X - S (where X is any amino acid) So far...

• Replies: 2
• Views: 2,961
07-11-2008, 08:41 AM
6. ### Help with finding indicated probability

I have worked on this problem now for the whole entire day, and still don't understand what I am doing wrong. Can someone help me? The problem...

• Replies: 4
• Views: 29,098
07-13-2008, 06:04 PM
7. ### Need Help Understanding Independence

Unfortunately, I am having trouble understanding independence. Can anyone explain independence to me in dummy terms?

• Replies: 2
• Views: 3,386
07-17-2008, 04:08 AM
8. ### Comparing conditional probabilities?

I have 250 respondents. They’ve reported their participation in three different kinds of political activities: reading about politics on line,...

• Replies: 2
• Views: 2,890
07-17-2008, 08:22 PM
9. ### Confidense interval for population standard deviation

Here is one I am stuck on...not even sure where to begin. Oh, and it is due in 19 hours ;-) A bank is attempting to improve the perceived customer...

• Replies: 2
• Views: 3,876
07-18-2008, 02:24 PM
10. ### Problem help needed

Does anyone know how to solve the following problem: i)Toss a coin until the nth H comes up. Let Y=#of required tosses. Calculate P(Y is even)....

• Replies: 0
• Views: 1,760
07-19-2008, 05:52 PM
11. ### Need help in finding the probability of events occuring?

Question: i have a total of 16 events whereby the probability of 2 events occuring is 0.3, the probability of 6 events occuring is 0.003 and the...

• Replies: 6
• Views: 5,537
07-20-2008, 01:38 AM
12. ### How to solve this problem?

HI, i get stuck on this problem, any1 knows how to solve it??? Horizontal lines y = n (n = 0, +-1,...) are drawn in R^2. A needle of length 1 is...

• Replies: 1
• Views: 2,473
07-20-2008, 10:38 AM
13. ### Help with coins!!!

Hi.. I don't know how to get started. Here is my problem: A coin was flipped 60 times and came up heads 38 times. (a) At the .10 level of...

• Replies: 2
• Views: 3,288
07-21-2008, 09:22 PM
14. ### P- value

Hi. Could a p-value be 5.7597? It seems too big!!!

• Replies: 1
• Views: 2,691
07-21-2008, 10:45 PM
15. ### What is the process spread ?

Here's the question: Fifty measurements were taken to determine the weights of filled ice cream containers. The average of these measurements is...

• Replies: 2
• Views: 11,833
07-23-2008, 07:12 AM

A teenager is mugged in the city centre for his expensive, size 9, trainers by a white man. A white suspect from the same city is arrested wearing a...

• Replies: 0
• Views: 2,040
07-23-2008, 10:27 AM
17. ### Stats question.

Part 1. In how many ways can a television director schedule a sponsor's six different commercials during the six time slots allocated to commercials...

• Replies: 1
• Views: 3,103
07-23-2008, 07:37 PM
18. ### probability of 'wrong-direction' pair

Hello! I have two normal distributions N1, N2 with means m1, m2 and standard deviations s1, s2. Let's say that m1 < m2. If I draw one observation...

• Replies: 3
• Views: 2,279
07-23-2008, 07:47 PM
19. ### An Unusual Probability Question

Hello everyone, I wonder if anyone would be willing to help me in deciding whether an unusual array of numbers I've found within the NIV Bible is...

• Replies: 0
• Views: 2,956
07-24-2008, 09:44 AM
20. ### Conditional Probability

I was hoping someone could shine some light on how to go about solving this question.... A dog has a litter of four pups. Assume, as usual, that...

• Replies: 1
• Views: 2,108
07-27-2008, 03:18 PM
21. ### I think this is binomial???

I was wondering if anyone can solve this problem and let me know how they did it. I am thinking this is a binomial problem, but I haven't been able...

• Replies: 2
• Views: 2,700
07-30-2008, 09:34 PM
22. ### Joint/Marginal PDF question

OK, I have this problem on my hw I am struggling through. Random vector (X,Y) has the joint pdf f(x,y) = c(x^2+y^2), for x^2+y^2<1, and = 0...

• Replies: 1
• Views: 4,798
07-31-2008, 04:33 PM
23. ### Bayes Theorem application

Prior probabilities if diseases are based on the physician’s assessment of factors such as geographic location, seasonal influences, and occurrence...

• Replies: 1
• Views: 4,970
08-03-2008, 12:55 PM
24. ### finding value of z0

P(|z| > z0) = 0.10 Find z0. I think the answer is z0 = 1.28, however I'm not sure how to get that. The first time I did it, I got 1.645,...

• Replies: 1
• Views: 23,627
08-04-2008, 11:55 AM
25. ### p-value to compare agreement between 2 methods

I have 2 methods which, given a list of variables, put these variables into an order. So imagine I have 20 possible variables,...

• Replies: 2
• Views: 4,946
08-04-2008, 12:51 PM
26. ### Probability that 53% of College Students graduate in 5 years or less

Good Afternoon, I am working on a problem and got stuck. The problem is below: It is estimated that approximatly 53% of College Students graduate...

• Replies: 2
• Views: 4,065
08-05-2008, 06:46 PM
27. ### Is there enough information here to solve this problem?

I'm not sure if I should be posting this under statistics or probability, but here's the problem: Jan did a survey of the students in her class in...

• Replies: 3
• Views: 2,792
08-06-2008, 12:40 PM
28. ### Movement in Consumer Choice / Markov Chain??

I'm trying to determine a way to model the choice behavior of a group of individuals whose choices are based on a 5-point scale (i.e. they can select...

• Replies: 1
• Views: 2,374
08-06-2008, 04:03 PM
29. ### Poisson/Binomial distribution help

Hi everyone I'm enrolled in a first year intro stats paper at uni and am having difficulty solving questions on proportions using binomial or...

• Replies: 6
• Views: 3,648
08-06-2008, 04:59 PM
30. ### Estimating Sports Statistics

I need some help with football application. I have a set of quarterback statistics projections for an entire season (16 games), including the players...

• Replies: 2
• Views: 2,721
08-07-2008, 01:56 PM
31. ### Luck vs. Skill Question

Hi, I am reading the book "Fooled By Randomness" by Nassim Nicholas Taleb and ran into what I think is a statistics/probability question. In the book...

• Replies: 1
• Views: 3,069
08-07-2008, 02:06 PM
32. ### moment generating function

Hi I have a question here: Let X be N(µ, Σ) obtain its moment generating function anyone know how to do it?? it really confused me !! ...

• Replies: 1
• Views: 2,934
08-08-2008, 01:08 AM
33. ### Dummy variables and regression

Hi there, I am using Y (with 6 categories) as an independent variable. In order to regress this variable with a dependent variable (Z), I had to...

• Replies: 1
• Views: 3,994
08-08-2008, 03:40 AM
34. ### Statistical significance for discrete data?

I'm getting myself in a muddle and hoping someone can help! I am analysing a discrete data set - I am comparing my control and experimental group,...

• Replies: 0
• Views: 2,452
08-09-2008, 09:28 AM
35. ### Method for Bayes spam filtering

I am trying to understand the method for Bayesian spam filtering given here http://en.wikipedia.org/wiki/Bayesian_spam_filtering It makes sense...

• Replies: 0
• Views: 1,706
08-10-2008, 04:35 PM
36. ### two questions for "poisson process"

Hi: I have 2 questions regarding the poisson process... 1) Let{N(t), t>=0} be a poisson process of rate 1. Evaluate E( N(3) | N(2),N(1) ) ...

• Replies: 1
• Views: 2,012
08-11-2008, 05:11 AM
37. ### Just a tiny bit of assistance

Among U.S. households, 24&#37; have telephone answering machines. If a telemarketing campaign involves 2,500 households, find the probability that more...

• Replies: 1
• Views: 2,289
08-12-2008, 09:30 PM
38. ### Mice in a maze probability puzzle

I’ve got a probability puzzle I am trying to solve and was hoping somebody could help. It comes from some chemistry experiments I’m doing, and not...

• Replies: 2
• Views: 4,978
08-13-2008, 10:51 AM
39. ### autoregressive

hi folks, i am using 2nd order autoregressive for prediction. my equation is y(t)=b1 + b2*y(t-1) + b3*y(t-2). i found the coefficients b1,...

• Replies: 3
• Views: 1,904
08-13-2008, 11:14 AM

Hi everyone, I have an exam on Friday and I just cant seem to get me head on how to answer a probability question, And because I don’t fully...

• Replies: 2
• Views: 2,359
08-13-2008, 03:48 PM
41. ### probability concepts

Hi, In Devore and Farnum (Applied Statistics and Scientists and Engineers), it gives this question on p. 210: "Suppose that there is a...

• Replies: 6
• Views: 3,535
08-13-2008, 07:16 PM
42. ### Interesting Probability Issue Here

Hi folks, I have an interesting probability question that has come up in a real life situation, and I'd like to pose it to you. My company is...

• Replies: 1
• Views: 1,973
08-14-2008, 02:00 AM
43. ### Analyzing a difference in conditional probabilities

Hi all, I would like to compare the conditional probabilities of an animal behaving in a certain way at two different treatment types. Say the...

• Replies: 4
• Views: 2,654
08-14-2008, 12:33 PM
44. ### The smoke you smell is my brain on STATS- Please Help

Just a little background if you can please bear with me. I live in Japan. I retired and am now living a pretty boring life. That is until I...

• Replies: 1
• Views: 1,962
08-18-2008, 02:42 AM
45. ### cost estimating with probability

i'm trying to do a quick cost estimation using this monte carlo program to see how it works but i'm also trying to factor in different types of risk...

• Replies: 0
• Views: 4,101
08-19-2008, 05:14 PM
46. ### discrete approximation of continuous probabilty

not sure how to state this, but... assume I want to randomly generate some discrete numbers in the range 1...k but i want them to be generated...

• Replies: 4
• Views: 3,781
08-21-2008, 03:59 PM
47. ### Poll

I have made a poll and I sent it to 10 people. 8 sent me it back and 6 made me some comments. I analyse that 3 say that they like RED. What can...

• Replies: 2
• Views: 2,231
08-23-2008, 09:47 AM
48. ### Area under the sampling distribution curve

Hi, Given a random sample size of n=10 (from a normal population) and a standard deviation of 5, how can I calculate the area under the sampling...

• Replies: 2
• Views: 4,647
08-25-2008, 04:11 PM
49. ### Need to find the distribution function

I have a probability function, and I would need the distribution for it, so I can calculate confidence intervalls. A nominal variable X can take R...

• Replies: 2
• Views: 2,811
08-27-2008, 03:13 AM
50. ### Probabilty of picking higher number

I am working on a webbased game, and need help with some probability. Player A rolls a 20 sided die with the numbers 1 through 20. Player B rolls...

• Replies: 12
• Views: 3,554
08-28-2008, 12:02 AM
51. ### if p( x|y)=p( y|x)=1

x, y, a are all rv, and a=/x, y, p(x|a)=/0 is p(x|a)=p(y|a)? Thanks!

• Replies: 0
• Views: 2,386
08-28-2008, 06:12 PM
52. ### Dice roll

Sorry if this topic has been discussed before. I hate looking through forums randomly for an answer to a question. So, maybe one of you could help...

• Replies: 6
• Views: 2,633
08-29-2008, 10:21 PM
53. ### calculation of a probability

Hi there, I have the following problem: Suppose that: X~Exp(3) Y=bernoulli(p), where p=exp(x)/(1+exp(x)). What is P(Y=1|X>2)=??? (or...

• Replies: 2
• Views: 2,508
09-01-2008, 02:41 AM
54. ### de Morgan's law

I need help. I just can't figure out where to go with this one.. For two events A and B show that: P(A intersection B) is greater than or...

• Replies: 1
• Views: 4,833
09-02-2008, 03:12 AM
55. ### Expectation of sorted random variables

Hi all, I'm stuck on what I thought was a simple problem that appears to be somewhat trickier than I expected, and am hoping someone can point me...

• Replies: 1
• Views: 3,140
09-02-2008, 06:13 AM
56. ### Stats probability

A bag initially contained 4 white marbles and 9 black marbles. A marble was drawn and replaced by 2 marbles.. of the opposite colour.. Then...

• Replies: 5
• Views: 3,839
09-02-2008, 09:25 AM
57. ### Statistic question, what equation???

Suppose I have these measurements: 21, 21.4, 22, 21.3, 22, 22.7, 25. What formula do I use to determine the probability that either 21.3 or 22.5 will...

• Replies: 1
• Views: 1,793
09-03-2008, 02:20 AM
58. ### Joint distribution of noncentral t statistics

Hi, I need to compute a probability which is described by the joint distibution of 2 non-central t statistics. If somemody knows references...

• Replies: 4
• Views: 2,470
09-03-2008, 10:30 AM
59. ### random variable?

A graduating senior seeking a job has interviews with two companies. After the interview, he estimates that his chance of getting an offer from the...

• Replies: 3
• Views: 3,756
09-04-2008, 07:10 AM

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