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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: 30,311
09-30-2005, 09:44 AM

A statistical analysis of 1,000 long-distance telephone calls made from the headquarters of the Bricks and Clicks Computer-corporation indicates that...

• Replies: 1
• Views: 7,404
04-26-2009, 04:21 AM
2. ### Confusion over Expected Conditional Value

I've recently read that for a random variable X, "the expected value of the negative values of X is the expected value of X conditioned on X being...

• Replies: 0
• Views: 2,810
04-23-2009, 03:05 PM
3. ### Standard Deviation in Probability

I'm having troubles with this probability question... The weights of apples in a large crate have a Normal distribution with μ = 138 grams and σ =...

• Replies: 3
• Views: 5,391
04-23-2009, 12:29 AM
4. ### Mathematical Statistics - Bayesian Estimate

Hi, I don't know if this is beyond what is done in this forum but I am looking for some help. Any hints or ways to approach this problem would be...

• Replies: 2
• Views: 3,296
04-20-2009, 05:02 PM
5. ### Confidence Intervals 101

Hi guys, I have a simple question - at least for some of you. Why do we substitute 0.25 when determining sample size without any prior estimates?

• Replies: 0
• Views: 2,403
04-20-2009, 09:21 AM
6. ### Bayesian posterior

Hi I am trying to put together a Bayes posterior distribution. I must have made a mistake because I am not able to manipulate the variables into...

• Replies: 0
• Views: 2,383
04-20-2009, 08:39 AM
7. ### Tricky Extra Credit Problem

Hey we just received this funny problem as extra credit: I know this isn't a poisson distribution because we are dealing with 2-dimensions...

• Replies: 0
• Views: 2,412
04-20-2009, 08:25 AM
8. ### Bionomial Distribution question

Am I on the right track or close????? I have been working all day to figure this question out If 60&#37; of voters favor new ball park: A. If...

• Replies: 2
• Views: 2,843
04-19-2009, 11:07 PM

I don't understand how to solve this problem. Please help! Thanks in advance A common design requirement is that an item (such as an aircraft or...

• Replies: 3
• Views: 9,893
04-19-2009, 10:53 PM
10. ### counting tree?

Here is a problem I need help with: A USA Today national survey of heads of households found that 24% of women had asked for a raise, and of those...

• Replies: 2
• Views: 3,479
04-18-2009, 02:33 PM
11. ### Distributions

shuffle a deck of 52 cards turn over one top card until you reach the first ACE. find the E(X).

• Replies: 1
• Views: 2,286
04-16-2009, 07:59 PM
12. ### 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: 2,705
04-16-2009, 01:12 PM
13. ### Permutation Problem(?)

Here is the info, followed by a few problems. I got one correct, but can't figure the others: A study conducted by the A.C. Nielsen Company found...

• Replies: 1
• Views: 2,308
04-15-2009, 10:20 PM
14. ### Calculating the Odds of Winning

I'm trying to calculate the odds of winning a promitional event. The game is as follows: There will be 50 envelopes each with a poker card in it....

• Replies: 0
• Views: 2,288
04-15-2009, 10:47 AM
15. ### Poisson Distribution(Homicide Deaths)

Hi, I have attempted the following question. Half I could solve, I need help to complete it. Question In one year, there were 116 homicide deaths...

• Replies: 1
• Views: 8,500
04-14-2009, 09:01 PM
16. ### Sum on k dice

I'm currently working on a research project on the game of Plinko and I'm trying to go about modeling the winnings with taking into account how many...

• Replies: 1
• Views: 2,620
04-14-2009, 02:22 PM
17. ### Hypergeometric Probability Calculation

Hi, I was hoping that someone can help me do this calculation. List 1: 400 markers drawn from a sample of 4067 List 2: 145 markers drawn from a...

• Replies: 0
• Views: 2,289
04-12-2009, 11:33 PM
18. ### Homework help pls!

Hi, i need some help on my homework which is due tml. Here goes: Let X1,..., Xn be i.i.d. U(0,theta) random variables. Let Yn be the maximum of...

• Replies: 0
• Views: 2,383
04-12-2009, 01:45 PM
19. ### queueing theory

I'm interested in this problem. Let N be the number of customers in the queueing system at steady state. I know how to find the distribution of N for...

• Replies: 0
• Views: 2,582
04-10-2009, 06:28 PM
20. ### Pure death process

• Replies: 0
• Views: 3,623
04-10-2009, 12:40 PM
21. ### uniform random variables, max, sequence

-qn solved-

• Replies: 0
• Views: 2,109
04-10-2009, 08:45 AM
22. ### limits and independent rvs

Let X_1, X_2,... be a sequence of independent r.v.'s with EX_i = miu_i, Var(X_i) = (sigma_i)^2, i= 1, 2,.... Assume that: i) lim n-> inf (...

• Replies: 2
• Views: 5,058
04-10-2009, 08:30 AM
23. ### probability from moment generating function?

if the moment generating of a random variable X is M_x(t)=(1-t)^-2 compute P(-2 < X < 3) or explain why it cannot be computed how do I do...

• Replies: 4
• Views: 6,564
04-10-2009, 08:27 AM
24. ### Probability Question Help

• Replies: 0
• Views: 4,007
04-09-2009, 03:19 AM
25. ### Once again, simple help

What is the Phi greek letter used for in statistics. I am using it for random variables and the context is phi(a number). I have a given mean and...

• Replies: 2
• Views: 2,871
04-08-2009, 11:58 PM

Thank you. +10 marbles, 7 are red. If 2 are selected at random, what is the probability that at least one is red? I multiplied 7/10 (the red) by...

• Replies: 0
• Views: 2,188
04-08-2009, 06:58 PM
27. ### Sampling Distributions for Proportions Question Help

Hi, I am trying to work on this question, but I cant seem to figure it out. Help would be appreciated. Q: Of American high school students, 41%...

• Replies: 0
• Views: 2,359
04-08-2009, 11:09 AM
28. ### Study help, discrete random variables

1. Assume that a process of producing fiber optic cables has probability of 0.05 that a newly-produced cable (of a certain length, say 100 meters)...

• Replies: 2
• Views: 2,713
04-07-2009, 10:47 PM
29. ### Hypergeometric formula to check

Hi, can someone check this formula for me please. I have population of 40 (numbered 1-40) and I want to get a sample of 6. I want to know the...

• Replies: 1
• Views: 2,091
04-07-2009, 05:56 PM
30. ### bayes theorem DNA statistics

A crime is committed in an isolated commnity and a single bloodstain is left at the scene of the crime. In this community, 74&#37; of the adult male...

• Replies: 0
• Views: 3,009
04-07-2009, 02:03 PM
31. ### Moment generating function help

hi any one can provide help with this or any suggestion on how to approach the question? much thanks!

• Replies: 1
• Views: 2,990
04-07-2009, 11:17 AM
32. ### Really don't know how to approach these problems...(Normal Distribution)

I'd like to preface this thread by stating that statistics isn't my strongest subject; I've never been a great math student. I've never had a...

• Replies: 0
• Views: 1,985
04-06-2009, 08:47 PM
33. ### Infer the best time of day to call?

I work for a non-profit. We do courtesy calls (no telemarketing) to our existing constituents. Half the calls end up in answering machines. To be...

• Replies: 0
• Views: 2,859
04-06-2009, 06:07 PM
34. ### Normal/Binomial Distribution question

Hey guys, I was hoping someone could help me out with this question that I've been stuck on for a few days now. "Shorty's muffler advertises...

• Replies: 0
• Views: 6,893
04-06-2009, 02:52 PM
35. ### Joint PDF - Limits of Integration

Given f(x, y) = c(y^2 - x^2)e^-y with -y <= x <= y, 0 < y < infinity Find P(Y + X^2 <= 1/4) I'm just wondering about the limits of...

• Replies: 1
• Views: 3,822
04-06-2009, 10:26 AM
36. ### Poisson Distribution

Hi all, it's me again! Just got a quick question here with the poisson distribution. Suppose messages arrive at a voice mail system according to a...

• Replies: 4
• Views: 4,774
04-06-2009, 10:23 AM
37. ### 5% uniform random noise

Can someone describe what 5% uniform random noise is?

• Replies: 0
• Views: 2,757
04-06-2009, 10:01 AM
38. ### Moment generating function

Given: f(y) = exp(-y). y > 0 Find the m.g.f of lnY. And specify the range of t. I got to that moment of lnY is E = E and then i tried to...

• Replies: 0
• Views: 2,355
04-06-2009, 03:56 AM
39. ### Independent Poisson R.v.'s

A and B are independent poisson r.v's. with means a and b respectively. What's the conditional distribution of A given A + B? I'm aware of how to...

• Replies: 2
• Views: 1,987
04-06-2009, 03:31 AM
40. ### Question about use of Kernel probability Distribution

Hello everyone, I had a general question on the use of kernel probability density estimation for one dimensional data. I want to apply it to my...

• Replies: 0
• Views: 2,388
04-05-2009, 08:35 PM
41. ### Variance?

Hi All, In an assembly-line production of industrial robots, gearbox assemblies can be installed in one minute each if holes have been properly...

• Replies: 0
• Views: 4,802
04-05-2009, 10:59 AM
42. ### Help to find the joint density function.

Hi, Can someone please help me find the joint density function f(y1,y2) for the given problem. Suppose that Y1 and Y2 are uniformly distributed...

• Replies: 3
• Views: 10,058
04-04-2009, 11:59 PM
43. ### Hypergeometric distribution

Hi, The problem is- A shipment of 20 cameras includes 3 that are defective. What is the minimum number of cameras that must be selected if we...

• Replies: 1
• Views: 6,359
04-04-2009, 11:49 PM
44. ### Finding constant k in a poisson distribution

Hi, I am stuck with this problem and looking wodering if anyone has a suggestion. I got a truncated poisson density function: P(x) = k *...

• Replies: 1
• Views: 3,363
04-04-2009, 10:26 AM
45. ### Fishers Exact Test?

Hi All! I'm on the last question of a multi step problem and I'm not sure how to do it. Suppose we take a simple random sample of 10 members of...

• Replies: 0
• Views: 2,586
04-04-2009, 04:24 AM
46. ### Can I calculate a p-value here?

Hey everyone! Ok so I ran a biochemistry experiment the other day and I wanted to calculate a p-value for my data. The experiment is pretty...

• Replies: 2
• Views: 7,399
04-02-2009, 04:47 PM
47. ### Mr

Need to simultaneneously compare child-woman ratios of two censuses presented in 2 (4*7) tables;4 educational categories and 7 age-groups. Any...

• Replies: 5
• Views: 2,404
04-01-2009, 04:56 PM
48. ### Confidence intervals (or regions?) in an opinion poll analysis

Hi, I have a question about confidence intervals (or regions?) used with opinion poll results. I made a poll with three different possible...

• Replies: 0
• Views: 2,023
04-01-2009, 04:40 AM
49. ### Percentile??

Exam scores were normal in BIO 200. Jason's exam score was one standard deviation above the mean. What percentile is he in? I do not know where to...

• Replies: 1
• Views: 4,254
03-31-2009, 01:41 AM
50. ### How can I find E[max Xi \ X1<X2<X3] ????

If Xi , i = 1, 2, 3, are independent exponential random variables with rate lambda_i, i=1, 2, 3 find E :conditioning problem How can I proof that...

• Replies: 0
• Views: 5,435
Kui
03-30-2009, 08:08 AM
51. ### Distribution help

Hi, help with any of these is greatly appreciated. n=sample, p= probability x = random sample from n how to find: the chance that x is...

• Replies: 1
• Views: 2,118
03-30-2009, 01:44 AM
52. ### Conditional Expected Value

Given: x = N(0,1) y = N(0,1) z = N(0,1) *x,y, and z are statistically independent That is, x, y, and z are all normally distributed with mean 0...

• Replies: 3
• Views: 3,612
03-30-2009, 01:09 AM

Hi everyone, My question is- If Y denotes a geometric random variable with probability of success p, then show that for a positive integer a,...

• Replies: 2
• Views: 9,084
03-29-2009, 12:49 AM
54. ### pdf of sigma x^2 for sample from normal distribution

I have a sample from a normal distribution N(0,theta) and am trying to show that s=sigma x^2 is a sufficient statistic. To do this I am trying to...

• Replies: 0
• Views: 3,856
03-29-2009, 12:06 AM
55. ### How can you simplify or approximate (p - 1)!/([p^(x-1)](p-x)!)?

Essentially I need to compute the values of (x - 1)!/((x - p)!) for p = 61,113,205 (population of UK) and x = 1, 2, 3, ... p This should show the...

• Replies: 3
• Views: 4,227
03-28-2009, 04:30 PM

ok, so the question says that a teller at a bank were found to follow a exponentail distribution with a mean of 3.2minutes. A customer arrive at...

• Replies: 1
• Views: 3,219
03-28-2009, 12:38 AM
57. ### Picking a ball you've picked before

Let's say there's a bag with P balls and each time you pick a ball, you choose one ball at random and put it back in the bag afterwards. What...

• Replies: 2
• Views: 3,055
03-27-2009, 01:07 PM
58. ### probabilty question

a test consists of 10 multiple choice questions, each with five possible answers, one of which is correct. To pass the test a student must get 60% or...

• Replies: 1
• Views: 2,714
03-26-2009, 04:21 PM
59. ### Am I doing this right?

Here is the problem: According to an opinion poll, 905 of 1393 americans polled believe that america is ready for a woman president. If the...

• Replies: 0
• Views: 2,303
03-26-2009, 12:43 PM

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