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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: 30,322
09-30-2005, 09:44 AM
1. ### UK Sports Sweepstake Question

Hi, my friends have been having many conversations on the following subject and can't seem to find an answer anywhere and now we have a little...

• Replies: 2
• Views: 3,780
01-17-2010, 10:39 AM
2. ### Some more Poisson type questions

Hi! I would greatly appreciate if someone could look these over for me: Suppose Oils spills off the coast of BC in any given year has a Poisson...

• Replies: 1
• Views: 2,378
01-15-2010, 07:07 PM
3. ### Verify type question

Verify that if X ~ Poisson (mu1) independently of Y ~ Poisson (mu2), then the conditional distribution of X given that X + Y = n is Binomial on n...

• Replies: 4
• Views: 3,009
01-15-2010, 03:16 PM
4. ### Restaurant Grand Opening probability question

Hi, i was wondering if anyone could help me figure out something. Here is the situation: There is a chain restaurant that has grand openings in new...

• Replies: 6
• Views: 3,206
01-15-2010, 01:42 PM

Hi, I have a probability question for my Uni Stats course, and I'm having a bit of trouble figuring out what to do. If someone could help, that...

• Replies: 0
• Views: 1,880
01-10-2010, 06:32 PM
6. ### Poisson Question

Got a question here about an antenna designed to withstand 50mph wind ( 20m abover ground) the 50mph wind occurs once every 30 years on average. What...

• Replies: 5
• Views: 2,698
01-10-2010, 03:50 PM
7. ### binomial distribution

If every person tossed a coin 5 times, what is the probability of observing 5 tails if there are 1000 people? i can work out the answer if only...

• Replies: 1
• Views: 2,913
01-10-2010, 03:49 PM
8. ### Trouble with diagnosis probability

Having an absolute nightmare as part of my Nautical Science Honours course... I'm no statistician! Need to find a solution for this problem, can...

• Replies: 2
• Views: 2,686
01-10-2010, 12:34 PM
9. ### Poisson Distribution

Hi: I was wondering if there is a proof (or reference) for the following property of the Poisson distribution: Go here, ...

• Replies: 2
• Views: 6,339
01-08-2010, 09:54 AM
10. ### ex(xy)

Hi, i can't figure out how do i calculate e(xy) in cases they are not independent and lets say they have the same distribution, for instant...

• Replies: 1
• Views: 11,324
01-08-2010, 08:36 AM
11. ### Need HEEEELP!!! with historical corpus analysis

Hei cracks out there! Though I am a great fan of statistics - and statisticians :tup: - I have so far only made it to an introductory course. So I...

• Replies: 0
• Views: 3,012
01-07-2010, 08:54 AM

there is two problems that i can answer .. 1) Processing of the ceramic alloy involves a sintering ( firing ) process which produces a dense hard...

• Replies: 4
• Views: 3,090
01-06-2010, 02:00 PM
13. ### Quantifying response with variable length history

I have what I hope is a common a statistics problem. In our non-profit organization we occasionally send people direct mail appeals. The goal is to...

• Replies: 0
• Views: 2,152
01-05-2010, 08:05 PM
14. ### predictions

hi, when i am asked to give a prediction about X in which cases i use what: 1. most probable x 2. e(x) 3.e(x|y) 4. x=ay+b thanks

• Replies: 1
• Views: 2,747
01-01-2010, 07:28 PM
15. ### help with some question

hi there are some questions i was unable to solve. i will describe them and say where exactly my problem is. 1. a fair cube (with six surfaces) is...

• Replies: 2
• Views: 2,373
BGM
12-30-2009, 04:16 AM
16. ### random numbers vs dice

Hi my stats knowledge is sufficient to think of this problem but insufficient to get the answer, and its annoying me! Assume I have 46656 base 6...

• Replies: 4
• Views: 4,467
12-28-2009, 12:30 AM
17. ### Pearson 5 (inverse Gamma) and Apha/Beta

Hi everyone !! I'm a newby actually, so I hope you'll understand my problem here :) I have a serie of data (the times spent by a car at a...

• Replies: 1
• Views: 4,411
12-26-2009, 11:04 PM
18. ### HELP! P with percentages...3 problems

:) 1. A researcher wishes to conduct a study of the color preferences of new car buyers. Suppose that 40% of this populatin prefers the color red....

• Replies: 2
• Views: 10,029
12-26-2009, 10:45 PM
19. ### Bowling - determining the probability of beating the other guy...

Let's say bowler A and bowler B are going to face off in one match (string) in a single-elimination tournament. The higher score moves on. Over...

• Replies: 2
• Views: 3,597
12-26-2009, 02:34 PM
20. ### Basic Combination problem

Hey guys i am really stuck on this problem: At a recent gathering there were 7 musicians, 10 teachers, and 3 accountants, all noted for their love...

• Replies: 1
• Views: 2,562
12-26-2009, 02:17 PM
21. ### E(X) Vaiance SD and P

Consider the following data - x =3, P(X) is .2 x=4, P(X) is .1 x=5, P(X) is .2 x=6, P(X) is .2 x=7, P(X) is .1 x=8,P(X) is .2 Find the...

• Replies: 1
• Views: 2,073
12-26-2009, 01:40 PM
22. ### Few questions

Hey guys, Im doin a subject called Statistics for Business at university, and I need some help..I will post the question and how I work it out, and...

• Replies: 2
• Views: 1,912
12-21-2009, 10:24 PM
23. ### Joint Pdf

Hi all! Someone can help me with this simple problem? The duration of a certain type of bulbs has a exponential distribution with known parameter...

• Replies: 1
• Views: 2,456
BGM
12-20-2009, 11:18 AM
24. ### Lottery combinations?

Someones invented a bet and put it on beluckytote.com. I'm thinking of putting 20p on it but I'm not sure what the odds for the different options...

• Replies: 3
• Views: 4,063
sid
12-17-2009, 05:18 PM
25. ### n-dimensional normal distribution

Hi. My question is about the theory. For example we have two independent normal distributed variates. Then their joint distribution is also...

• Replies: 3
• Views: 6,506
12-17-2009, 11:39 AM
26. ### I still need help please

Ok, so I am still working on this freaking problem. Can someone help me please. It states that the scenario is normally distributed with a mean price...

• Replies: 12
• Views: 22,997
12-14-2009, 09:10 PM
27. ### Tricky Poisson probability

Hi: I have a Poisson probability I am having a rough time wrapping my head around. "The number of planes flying overhead averages 40 per hour....

• Replies: 1
• Views: 2,394
12-13-2009, 06:09 AM
28. ### Poisson process: compute E[N(3) |N(2),N(1)]

note: N(t) is the number of points in and N(t1,t2] is the number of points in (t1,t2]. Let {N(t): t≥0} be a Poisson process of rate 1. Evaluate...

• Replies: 7
• Views: 3,696
12-13-2009, 01:32 AM
29. ### Need help with a question please!

Hey everyone. I am having difficulty with one of my questions and would appreciate any help. It deals with normal distribution. The mean price is \$36...

• Replies: 2
• Views: 2,171
12-12-2009, 11:19 AM
30. ### Need help with Review for final

Hi, so i have been having a lot of trouble placing the null and alternative hypotheses. I had thought that i was doing it right, but the mark always...

• Replies: 1
• Views: 2,970
12-12-2009, 01:17 AM
31. ### Specific set number generator

Hi, I`m totally newbie in statistic and i would like to ask for help. I need to write a program for generating a list of numbers from a specific...

• Replies: 1
• Views: 5,795
12-11-2009, 11:19 PM
32. ### Probability using z-table

I'm studying for a final and working on some practice problems. I'm stumped on this one and would appreciate any and all help you can provide. The...

• Replies: 4
• Views: 6,096
12-11-2009, 07:42 PM
33. ### probability help, related to moment generating function

X and Y are two independent random variables having mgfs Mx(t)=exp{et-1}and MY(t)=et/(2-et). et=>exp{t} How to find a closed expression for P...

• Replies: 1
• Views: 2,565
BGM
12-11-2009, 03:28 PM
34. ### Kernel density estimation for non-I.I.D. data

Hi - This is my first post here, so let me know if I'm out of order in any way. I am wondering if Kernel Density Estimation (KDE) is appropriate...

• Replies: 0
• Views: 3,253
12-11-2009, 01:34 PM
35. ### Probablitiy question

I have a feeling this is tougher than it sounds... Two individuals receive an envelope filled with dollar bills. The number of dollars is greater...

• Replies: 2
• Views: 2,465
12-11-2009, 01:30 AM

I am preparing for my test which is on Friday. There is this problem which is killing me and I don't have any idea how to solve it! It is in...

• Replies: 0
• Views: 2,509
12-09-2009, 09:35 PM
37. ### Poisson process on R^2

Consider a Poisson process of rate λ on R^2. Let N(r) be the number of points in a circle of radius r centered at the origin and Y2 be the distance...

• Replies: 0
• Views: 3,215
12-09-2009, 09:07 PM
38. ### Probability question on finding condtional density

Find f(x|y) of f(x,y)=24y(1-x-y) if x>0, y>0, x+y<1? My understanding is that fy(y) is the integral from 1-y to 0 for function f(x,y)with respect...

• Replies: 0
• Views: 2,192
12-08-2009, 12:54 PM

I cannot figure out this problem for the life of me. Can someone please help me. I have the answer. .58. However, I cannot figure out the solution. I...

• Replies: 2
• Views: 5,525
12-05-2009, 02:05 AM
40. ### Estimating proportion

A processor of carrots cuts the green top off each carrot, washes the carrots, and inserts six into a package. Twenty packages are inserted in a box...

• Replies: 0
• Views: 4,361
12-02-2009, 09:43 PM
41. ### Problem with MLE with Bernoulli and Gamma distribution

Hi, Can any body help with the following problem: a medical practitioner is interested in measuring the success of a drug on n = 100 patients....

• Replies: 0
• Views: 3,088
12-02-2009, 08:16 PM
42. ### Binomial Question

Current medical studies indicate that 30% of the population will suffer from the flu each winter. A group of 12 people is randomly selected. a....

• Replies: 3
• Views: 2,418
12-02-2009, 08:08 PM
43. ### simple probability question

Hey guys, great forum! I've got a problem: I own 3 tools, which have average time of life 4, 6 and 8 days (exponential distribution). How can I...

• Replies: 2
• Views: 2,641
12-01-2009, 06:19 PM
44. ### Need Help With Joint Density Problem Please!

I got the problem

• Replies: 5
• Views: 4,304
11-26-2009, 10:35 AM
45. ### Convergence of random variables

I was reading some proofs about the convergence of random variables, and here are the little bits that I couldn't figure out... 1) Let X_n be a...

• Replies: 2
• Views: 2,660
11-26-2009, 09:19 AM
46. ### I have another question please!!

I need help with how I figure out the solution to a question I am working on. I seem to be having a difficult time with probability and it does not...

• Replies: 1
• Views: 2,019
11-25-2009, 11:40 PM

I seem to be really stuck on the whole probability concept. I am trying to work through my assignment but it seems like I keep getting stuck. Can...

• Replies: 3
• Views: 2,192
11-25-2009, 10:47 PM
48. ### Confusing Problem and Need Help!

...........................

• Replies: 0
• Views: 2,570
11-25-2009, 09:27 PM
49. ### Tough and Really Need Your Help!

....................

• Replies: 1
• Views: 1,926
11-24-2009, 04:45 AM
50. ### Poisson and Binomial Random Variable question

no help needed

• Replies: 2
• Views: 3,461
11-24-2009, 01:17 AM
51. ### Need Help With This Question!

No help needed

• Replies: 2
• Views: 2,315
11-24-2009, 12:48 AM
52. ### Maxent of Joint from Conditionals

I have a problem where I have three random variables, x, y and z, that each take on nonnegative real values. I know the three conditionals p(x,y|z),...

• Replies: 0
• Views: 1,861
11-23-2009, 08:12 PM
53. ### random selection probability problem

Hi all, I have about 150 factors, of which 25 turns out be present in particular dataset. I want to prove that probability of finding 25 out of 150...

• Replies: 0
• Views: 2,276
11-23-2009, 09:54 AM
54. ### Joint Density Help

What is joint density?

• Replies: 0
• Views: 2,426
11-23-2009, 02:22 AM
55. ### Need Help On This One

................

• Replies: 0
• Views: 1,652
11-23-2009, 02:15 AM
56. ### significance/confidence interval help?

A 90% confidence interval for μ is (0.65, 0.70). Performing a two-sided test, you would _____ H0: μ = 0.69 at the 10% significance level. ...

• Replies: 1
• Views: 2,578
11-22-2009, 10:06 PM
57. ### P-Value help

If John and Joel are both salesmen and their p-values are .9972 and .9332 respectively, would John be considered a better salesman? It appears to me...

• Replies: 0
• Views: 1,944
11-22-2009, 07:58 PM

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