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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: 30,319
09-30-2005, 09:44 AM
1. ### Another difficult Gaussian integral

Hello all, This time, I'm trying to compute \int^{\infty}_{-\infty} \frac{1}{c} \Phi\left(\frac{x}{a}\right)\phi\left(\frac{x-b}{c}\right) dx ...

• Replies: 3
• Views: 4,294
BGM
04-07-2011, 11:28 AM
2. ### Chebyshev's inequality and Error bound

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

• Replies: 1
• Views: 3,598
BGM
04-07-2011, 06:15 AM
3. ### Monte Carlo variance and error bound

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

• Replies: 1
• Views: 4,038
BGM
04-07-2011, 06:11 AM
4. ### Probability

Hi I am wondering how to find the probability of a number if only given the standard deviation and the mean. The question states the following: ...

• Replies: 1
• Views: 4,518
04-06-2011, 08:19 PM
5. ### A contradiction in standard deviation.

Hi there. When calculating the SD of a single spin on a European roulette wheel on a single number one gets: SD = 5.84 when using SD = sqrt...

• Replies: 1
• Views: 2,298
BGM
04-05-2011, 10:08 PM
6. ### Confused on where to get started

I've already went through the problems of Pr(z>x) but I'm confused on where to get started on this problem. If Pr(Z>Zo)=.5, what is the cutoff...

• Replies: 0
• Views: 2,375
04-04-2011, 07:04 PM
7. ### Using Taylor expansion for calculating Expected Value

Hello, This question is motivated by a very helpful approach suggested by BGM for solving an expected value estimation problem recently posted on...

• Replies: 1
• Views: 11,098
BGM
04-04-2011, 02:15 PM
8. ### Is this a negative binomial?

Is this a negative binomial? I understand the solutions. But why am I not getting the right answer using the negative binomial formula? Problem:...

• Replies: 1
• Views: 2,596
BGM
04-04-2011, 02:04 PM
9. ### Interpreting meaning of predicted values when using a Generalized Linear Model

I’m having trouble understanding what the predictions actually mean when using a Generalized Linear Model with e.g. a Poisson error distribution and...

• Replies: 2
• Views: 5,314
04-04-2011, 12:30 PM
10. ### Probability question

I read the sticky in this section about trying the problem before posting the question but I don't know where to begin on this problem. Any help...

• Replies: 14
• Views: 11,658
04-03-2011, 04:15 PM
11. ### Probability using exponential distributions question

Hi everyone, I'm working through some likelihood and probability questions. I think I have this one right but I'm not entirely satisfied with my...

• Replies: 3
• Views: 3,033
BGM
04-03-2011, 11:20 AM
12. ### Likelihood Question

Hi everyone, I'm working through some likelihood questions and am stuck on this one. I've written out my solution here so far... Q. (i) T is...

• Replies: 2
• Views: 3,101
04-03-2011, 10:53 AM
13. ### Maximum Likelihood Question

Hi everyone, I'm working through some max likelihood questions and am badly stuck on this one. Please could you take a look at what I'm doing and...

• Replies: 2
• Views: 3,056
04-03-2011, 10:42 AM
14. ### Joint probability!

A steel manufacturer is testing a new additive for manufacturing an allow of steel. The joint probability mass function of tensile streanth and...

• Replies: 1
• Views: 3,370
BGM
04-03-2011, 03:46 AM

The reading given by a thermometer calivrated in ice water is a random variable with probablility density function f(x) { k(1-x) -1 { 0...

• Replies: 1
• Views: 3,216
BGM
04-03-2011, 03:39 AM
16. ### Distribution of sample mean using MGF

I'm not sure if I posted this in the right place, correct me if I'm wrong. I have been trying to solve this question for awhile now: Let...

• Replies: 4
• Views: 8,848
04-02-2011, 08:27 PM
17. ### discrete distribution

How do i find the mean and variance of a discrete distribution for both X and Y by using the marginal densities?

• Replies: 3
• Views: 3,415
04-02-2011, 08:23 PM
18. ### Normal Distribution

Hello, I've just started reading a stats book, but I think this is still a prob question. I haven't done any prob/stats in 3 years, and I never...

• Replies: 1
• Views: 4,164
BGM
04-02-2011, 09:01 AM
19. ### homework help!

any1 who can do as much of this as possible!?? 6.Assuming that the following sample of 12 numbers arise from a Normal distribution with mean ...

• Replies: 1
• Views: 2,790
04-01-2011, 09:02 AM
20. ### Equation involving uniformly distributed variable

Let U be a random variable uniformly distributed on , and let X be a dependent variable such that X^U = a for some number a (X^U means X to the power...

• Replies: 5
• Views: 3,081
BGM
03-31-2011, 02:29 PM
21. ### Final part of four part problem

I'm having trouble with the last part of a 4 part question as follows: Consider domain D={(x,y): 0<x<1, -x<y<x} with frequency distribution...

• Replies: 1
• Views: 2,507
03-31-2011, 11:10 AM
22. ### Homework Problem

Hi, I am a beginner in statistics, and can't figure out this problem: "In a highly publicized murder trial it was estimated that 25 percent of the...

• Replies: 3
• Views: 4,758
03-31-2011, 12:47 AM
23. ### Video lectures on SDE's

Hi people. Does anyone know of an online lecture series on stochastic processes and/or stochastic differential equations?

• Replies: 1
• Views: 6,054
03-30-2011, 05:55 PM
24. ### converting geometric distribution to the exponential family

converting geometric distribution to the exponential family f(x,p)=p^x*(1-p) does anyone know how to do this

• Replies: 1
• Views: 5,111
03-30-2011, 09:01 AM
25. ### Is this Bayesian solution correct?

I'm working on understanding the theorem, so I designed a question for myself: If 80% of students passed, 50% of students cheated, and 90% of...

• Replies: 2
• Views: 2,829
03-29-2011, 07:24 PM
26. ### Probability Problems

Stuck on the basics, can anyone help me here?? Suppose an SRS of 25 years from panama's rainfall history is chosen. Let x bar be the mean amount...

• Replies: 1
• Views: 2,768
03-29-2011, 02:51 AM
27. ### Theorem of Total Probabilities

• Replies: 1
• Views: 4,189
BGM
03-28-2011, 10:51 AM
28. ### Counting question

A bit of an odd problem because I was just doing this out of curiosity while helping a friend with this. I have a hat with 5 cards in it. I want...

• Replies: 2
• Views: 2,260
c2q
03-27-2011, 10:12 PM
29. ### Using multinomial logit to find probabilities

Hi, I am searching for assistance with a problem that I have been trying to solve over the past week. I have been doing some research on multinomial...

• Replies: 1
• Views: 3,280
03-26-2011, 10:49 PM
30. ### Conditional Expectation Problem

Hi all I need to solve the following problem: If E(X|Y)=Y and E(Y|X)=X, prove that X=Y almost surely. Seems like I'll need to use the...

• Replies: 5
• Views: 4,746
BGM
03-26-2011, 12:36 PM
31. ### construction project probability

A construction project is about 2 months away from the scheduled completion date. Based on the progress of the project to date, the contractor...

• Replies: 3
• Views: 4,201
03-25-2011, 12:13 AM
32. ### probability help...poisson process

hi there can any one explain and show me how this is done please , i have a book at home and there are lots of unexplained questions . During...

• Replies: 1
• Views: 2,258
BGM
03-23-2011, 04:28 PM
33. ### Help with Probability Distribution please?

I'm working on a STAT class at a community college and have a take home project. The first question is confusing me. I don't expect someone to give...

• Replies: 1
• Views: 2,837
03-23-2011, 01:06 PM
34. ### kleptomania

If the average shoplifter goes 49 times before getting caught, this seems like a profitable and relatively risk-free enterprise. It sounds like the...

• Replies: 2
• Views: 2,949
03-23-2011, 11:24 AM
35. ### Probability Problem

Hello everyone!! I need to solve the following problem: Derive the followings equations: - P(AC)=P(AB1C)+...+P(ABNC) -...

• Replies: 0
• Views: 1,952
03-22-2011, 08:21 PM
36. ### Probability | Card deck

A card is drawn from a well shuffled deck of 52 cards. Find P(drawing a face card or a 4). Now since the cards can't be replaced, would you get...

• Replies: 1
• Views: 6,447
03-22-2011, 01:58 AM

This question is really confusing me: The annual profit Y(in $100,000) can be expressed as a continuous function of drug demand x(in 1,000): Y(x)... • Replies: 6 • Views: 12,282 03-21-2011, 10:53 PM 38. ### probability problem Hi, First Thanks in advance. I am current studying distance education and struggle with some probability homework Qs. So glad I found this site. ... • Replies: 9 • Views: 7,130 03-21-2011, 10:35 PM 39. ### 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: 3,527 03-21-2011, 06:30 PM 40. ### Probability Question Suppose that a random sample of beer is taken to assure the quality of the beer. You select a sample of size 50 from a population with an unknown... • Replies: 3 • Views: 2,019 03-21-2011, 02:16 PM 41. ### a question Hi I need an answer Consider N variables uniform distributed over the set 0 and 1. What is the highest expected value among them? Thx, Ori • Replies: 1 • Views: 2,026 03-21-2011, 08:57 AM 42. ### Conditional Probability Hello!!! Can anyone help me with this problem??...please!!! In relation to Equation P(A│B)=P(AB) / P(B) Show that: P(A│B)P(B)=P(B│A)P(A) • Replies: 5 • Views: 2,691 03-20-2011, 09:12 PM 43. ### Finding data value corresponding to a probability My apologies if this is in the wrong section first of all, probability seemed appropriate. Starting off with the question I'm trying to come up... • Replies: 6 • Views: 8,411 03-20-2011, 06:47 PM 44. ### Interpreting Interaction Effects I have ran interaction effects in Binomial logistic regression. I know how to interpret the interaction effect but I am having trouble interpreting... • Replies: 1 • Views: 3,489 03-20-2011, 05:16 PM 45. ### Normal approximation Given n=200 and p = 0.01 (probability that you will find a customer spending less that$100). Find the probability that you won't find any that spend...

• Replies: 10
• Views: 5,748
03-20-2011, 04:05 PM
46. ### what test shoud I use?

hi! I have a problem, I don't know which test should I use... So here it goes: Let's assume we are observing a population of students on a...

• Replies: 8
• Views: 3,062
03-20-2011, 09:10 AM
47. ### basic lotto question

Hi there, I was always confused with combinations etc but in most cases I was able to find my way out. But this one is really annoying me: ...

• Replies: 1
• Views: 2,281
03-19-2011, 11:37 AM

Hi. Just trying to figure out something for one of my hobbies... I have a PDF that describes the wait time between event 1 (which happens at...

• Replies: 1
• Views: 2,621
BGM
03-18-2011, 12:05 AM
49. ### Homework Qs help

Hi I really dont understand were or with what im supposed to start with these questions. 10. A star is suspected of occasional outbursts of...

• Replies: 1
• Views: 2,936
03-17-2011, 01:56 PM
50. ### MLE of range of Uniform(a,b)

So, I want an MLE for (b - a). log L(a,b|x) = -n log (b - a) given a < x_(1) and b > x_(n) but d/da log L gives me n/(b-a) >, and in fact =/=...

• Replies: 9
• Views: 10,905
03-17-2011, 12:13 PM

Derive the followings equations:

• Replies: 1
• Views: 2,635
BGM
03-16-2011, 12:40 AM

figured out the answers...thanks anyway! =)

• Replies: 0
• Views: 2,194
03-15-2011, 07:05 PM
53. ### Probability in Census

Hey, having some trouble with a problem: The 2000 census allowed each person to choose from a long list of races. That is, in the eyes of the...

• Replies: 4
• Views: 7,088
03-15-2011, 05:25 PM
54. ### Is this problem even possible to solve?

"Last year 75% of Joe Shack's cash purchases were for less than \$150. In a random sample of 200 cash processing companies, what is the probability of...

• Replies: 2
• Views: 2,674
03-15-2011, 12:30 AM
55. ### bidding probability

Hi. I am not overly familiar with statistics. I am preparing a manuscript and I need a formula to determine probability. Here is the problem. ...

• Replies: 0
• Views: 2,845
03-14-2011, 02:45 PM
56. ### Probabilty : Round permutation problem

A garland is to be formed with five roses and five dahlias. If they are arranged randomly, find the probability of roses and dahlias being arranged...

• Replies: 5
• Views: 4,844
03-14-2011, 09:53 AM
57. ### Probability of a RV being higher than another

Hi, I have two random variables, say X1~N(m1,v1) and X2~N(m2,v2), how would I work out P(X1<X2) etc?

• Replies: 3
• Views: 3,215
BGM
03-14-2011, 08:19 AM
58. ### central limit theory question

hi: I have a exam coming up Monday and in reviewing the sample questions, I hit a snag and was looking for some help. The question is as follows:...

• Replies: 1
• Views: 2,502
03-12-2011, 11:30 PM

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