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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: 30,188
09-30-2005, 09:44 AM
1. ### introduction to stochastic process by by Hoel, Port and Stone.

those any one have this text. i have gone through all the questions in chapter 1 except for two prove questions. no 27 and 26 i am lost

• Replies: 6
• Views: 13,071
07-16-2010, 02:05 PM
2. ### Probability, binominal distribution

A hotel manager knows that approximately 5 % of the reservations are so called “no-shows” – people who have made a reservation, but do not arrive...

• Replies: 6
• Views: 7,993
02-03-2010, 03:22 AM
3. ### Question about probability - roulette wheel

Hi there, Have a question about the topic above. I spin a roulette wheel and wait until 31 of the 37 numbers have come up. I then cover the...

• Replies: 6
• Views: 5,185
02-09-2010, 01:23 PM
4. ### convergence short question

Hi there, The "n" below is a subscript If Xn is a sequence of random variables and Xn converges to zero almost surely. Can we say something...

• Replies: 6
• Views: 3,688
04-15-2010, 08:19 AM
5. ### Equation for the Standard Normal Curve

Does anybody know what the equation is for the standard normal curve? In my statistics class, we use a chart to find areas under the curve given...

• Replies: 6
• Views: 17,417
04-16-2010, 04:52 PM
6. ### Logistic Distribution Question

I have two independent random variables each with a logistic distribution (not necessarily same mean and variance). How is the difference (or sum)...

• Replies: 6
• Views: 8,176
04-27-2010, 07:22 AM
7. ### Industry-Wide safety factor of 4

I want to hang a 10# picture on the wall so I carefully and slowly load the hanger with 40#. It doesn't fall. What can I say at this point about...

• Replies: 6
• Views: 5,230
05-08-2010, 10:20 AM

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: 3,571
05-13-2010, 04:15 AM
9. ### Is this a standard distribution?

Hello, Please pardon my LaTeX, but does anyone recognize this probability distribution? \frac{ (1-w)^{n_1} w^{n_2} }{ ...

• Replies: 6
• Views: 2,540
BGM
05-22-2010, 04:26 AM
10. ### Binomial Distribution as N goes to Infinity

I know that the Central Limit Theorem says that all types of distributions go to normal distribution as N goes to infinity. However, is there some...

• Replies: 6
• Views: 9,113
07-15-2010, 07:36 PM
11. ### Easy Probability Question

Hi ppl, Im trying to solve to following simple problem but I'm finding it harder than expected. This problem has to be eventually be generalized...

• Replies: 6
• Views: 2,864
08-09-2010, 08:46 PM
12. ### prob.

how many different 10-letter words (real or imaginary) can be formed from the letters in the word MONOCHROME? okay, so I did this by doing...

• Replies: 6
• Views: 2,753
07-27-2010, 11:02 PM
13. ### Likert Scale Data

To all you statistics geniuses, I have some Likert scale data that I need to analyze. From research, I understand the controversy of using methods...

• Replies: 6
• Views: 9,964
08-04-2010, 09:59 AM
14. ### question about likelihood function/MLE

If a random variable Y has the following probability distribution: P (Y = 1) = p, P (Y = 2) = q, and P (Y = 3) = 1−p−q. A random sample of size n...

• Replies: 6
• Views: 4,508
08-06-2010, 10:25 AM
15. ### null hypothesis questions

A manufacturer of computer memory chips produces chips in lots of 1000. If nothing has gone wrong in the manufacturing process, at most 7 chips each...

• Replies: 6
• Views: 6,377
08-08-2010, 04:44 PM
16. ### Lickert scale mean median mode?

How do we find a 5 point lickert scale data`s mean median mode? is it possibl? I am not familiar with lickert scale data analysis, and yet I have to...

• Replies: 6
• Views: 10,996
08-13-2010, 03:36 AM
17. ### Poisson process, payment, standard deviation

We have an insurance company that pays out claims at times of a Poisson process, with rate 4 per week. Suppose that the mean payment is 10K dollar...

• Replies: 6
• Views: 7,339
09-01-2010, 09:06 PM
18. ### Is it a tricky question?

When many small businesses were surveyed, 82.2% said they employed women in some capacity. Of the businesses that employed women, 17.5% employed no...

• Replies: 6
• Views: 3,409
09-04-2010, 01:55 AM
19. ### Anderson-Darling test appropriate?

Hi, I have a large (>2500) number of z-scores and I want to test if the distribution of these deviates from a unit normal distribution. I have...

• Replies: 6
• Views: 11,819
10-17-2010, 10:04 PM
20. ### Poker Card Probability Question

Good evening everyone, I have the following question: Jane plays a game where she randomly draws a card from a pile of 3 poker cards initially...

• Replies: 6
• Views: 3,179
09-30-2010, 10:01 AM
21. ### Is it Binomial?

I am really stuck with this question, I am trying to figure out which distribution it is , can someone give me a hint plz?:( 2. A physician is...

• Replies: 6
• Views: 2,940
10-12-2010, 06:53 PM

15. A group is selling 1000 raffle tickets. The winning ticket gets $50,000. a. If tickets are given away for free, what is the Expected Value... • Replies: 6 • Views: 3,484 10-23-2010, 07:19 AM 23. ### Probability of 4 of n shots hitting. Hello. First timer here, hopefully you guys can help me! First of all, let me say that this is not a homework problem of any sort, it's for a... • Replies: 6 • Views: 3,729 10-26-2010, 01:18 PM 24. ### Interesting Bean Problem Good evening, I've encountered an interesting problem and need a little help with it (: Question 1A) A bean is placed in a bag. The bean is... • Replies: 6 • Views: 5,419 10-29-2010, 11:38 PM 25. ### Poll: Basic Probability 2 Four Coins are tossed together. What is probability that HEAD will appear on at least on of the four coins? • Replies: 6 • Views: 3,148 11-01-2010, 03:28 AM 26. ### Distribution of the Sum of r.v. Guys, I will appreciate if you can give me some hints on this problem: Let X1,X2,...Xn be i.i.d with mass function f(k)= / for k>1. Find the... • Replies: 6 • Views: 2,749 10-31-2010, 12:00 PM 27. ### Poll: Basic Probability 3 Please help me with this question Two cards are drawn at random from a pack of cards. Find the probability that both cards are of Red Colour or... • Replies: 6 • Views: 3,837 BGM 11-01-2010, 12:06 PM 28. ### help with expected value 1. Let X,Y and Z be 3 random variables, and X and Z are independent. Prove that Cov(X+Y,Z)=Cov(Y,Z). For this i expanded into E(Z(X+Y)) -... • Replies: 6 • Views: 4,696 11-07-2010, 01:09 PM 29. ### pls help me ok^^? hi all, who can give me hint to finish the question below? many thanks^^:yup: ----------------------------------------------------------------- A... • Replies: 6 • Views: 2,985 11-09-2010, 10:50 AM 30. ### simple proof of expected value... CV are random variables. Whats a hint to show if C<=V, then E(C)<=E(V)? my bad attempt if C<=V then P(C=s)<=p(V=s) for all s so summation of... • Replies: 6 • Views: 5,193 BGM 11-09-2010, 03:47 PM 31. ### Help PLz. I'm doing my college statistics homework and i have a number of problems that i cant seem to figure out at all.. i was hoping to get someones help by... • Replies: 6 • Views: 2,810 BGM 11-09-2010, 12:24 PM 32. ### Conditional Expectation question My final is on Mon, and I got this HW problem wrong from last week, and I still don't understand why. An item is selected randomly from a... • Replies: 6 • Views: 6,286 12-21-2010, 07:11 AM 33. ### How to calculate probability on dice groups. I'm a game designer studying the probability curves of various dice throwing mechanics. I know some basic statistics but it's been a while since I... • Replies: 6 • Views: 8,453 BGM 12-23-2010, 02:39 PM 34. ### Multivariate conditional probability Hello all, I'm having a difficult time finding an equation that will give me the conditional probability of a specific scenario occurring. To... • Replies: 6 • Views: 5,545 01-04-2011, 11:16 AM 35. ### Matching sets on Dice For those of you who know dice, I have this question: You roll multiple dice (with the same number of sides), what are the chances of getting... • Replies: 6 • Views: 5,051 01-25-2011, 01:05 AM 36. ### MLE question Q. The proportion of metal in an ore sample has the pdf: f(u) = c.u^(c-1) 0≤u≤1 (a) The parameter c>0 is a measure of the quality... • Replies: 6 • Views: 2,365 BGM 03-07-2011, 09:08 AM 37. ### Binomial/geometric distributions Which of the following are true statements? I. The histogram of a binomial distribution with p=0.5 is always symmetric II. The histogram of a... • Replies: 6 • Views: 5,611 BGM 03-07-2011, 03:21 AM 38. ### Help Whith this problem.. probability Hey my name is george... im Colombian... anyway if you guys can help me with this one i will try to translate this the better i can A box of 50... • Replies: 6 • Views: 2,534 03-11-2011, 04:54 PM 39. ### 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: 8,349 03-20-2011, 06:47 PM 40. ### Expected Profit 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: 12,206
03-21-2011, 10:53 PM
41. ### Poisson and Geometric Random Variable questions

Hi all, Can anyone tell me if I got the correct answers for the below two questions? Any help is appreciated. Q:Let X have a Poisson...

• Replies: 6
• Views: 5,388
04-28-2011, 10:29 PM
42. ### Need help with probabilities for work

All, I am in desperate need of some help that isn't school related. I have some issues at work that need to be addressed and they deal with...

• Replies: 6
• Views: 2,126
05-24-2011, 03:40 PM
43. ### sigma algebra and expectation

Are the following true or false ? Explain your answers. (If it is false, giving a counter example will do.) 1) If \displaystyle A_j \in ...

• Replies: 6
• Views: 4,446
BGM
06-18-2011, 02:25 PM
44. ### need help.. really bad..

1) Discrete random variable X is distributed whit definition: α is alfa P( X = k ) = α / 2^k k { 0, 1, 2, 3, 4 } ----------------------- a)...

• Replies: 6
• Views: 2,517
06-24-2011, 04:13 PM
45. ### help on to find probability density function

hey guys, i am really confused on something.here is the thing: i have; i=x+(x^2-y)^(1/2) and here x is uniform...

• Replies: 6
• Views: 3,136
07-03-2011, 10:56 AM
46. ### Homework Problem- Normal Distribution/Standard Deviation

Hi there, I've been working through my homework problems and this one has totally stumped me in terms of where to start in order to complete the...

• Replies: 6
• Views: 5,734
08-14-2011, 07:40 AM
47. ### brownian motion in stopping time

Hello everyone! I am stuck with a little problem concerning BM and stopping time. :( If we define tau_n:=inf{t>=0 : |W_t|>=n}, does anyone have...

• Replies: 6
• Views: 3,701
07-15-2011, 12:41 PM
48. ### expected gain

Let's say the price people are willing to pay for something is listed below, so 9 people are willing to pay 3 while only 1 is willing to pay 12. How...

• Replies: 6
• Views: 4,225
07-17-2011, 11:28 AM
49. ### Learning Probability Math

I’m reading a couple of works on probability, including “Probability Theory: The Logic of Science” by Jaynes. All of the math is over my head, and I...

• Replies: 6
• Views: 2,778
08-05-2011, 01:09 PM
50. ### Basic (or maybe not so) probability problem/experiment/question.

I came upon an interesting probabilistic assertion in a book I'm reading. Here's the quote: "Once in a while we find co-occurrences, and we're...

• Replies: 6
• Views: 2,724
BGM
09-06-2011, 03:20 AM
51. ### Factorials

How would I solve this problem? If I roll a fair die 4 times. X is the number of times 1 or 2 are observed in 4 rolls. What is the minimum number...

• Replies: 6
• Views: 2,004
10-23-2011, 08:33 PM
52. ### Confusion with distributions..

I have the following question and I have no idea how to solve it. 3) The population variance of the distribution for X is 100. Two random samples...

• Replies: 6
• Views: 3,286
BGM
11-09-2011, 02:38 AM
53. ### Trivial question

Hi All, This is my first post here so be gentle. I've the following question: Suppose you have a parameter X, given by X=g(Y), that could only...

• Replies: 6
• Views: 2,557
11-15-2011, 06:58 AM
54. ### Help required with a linguistics-related probability problem

Hello all, As someone with very little background in probability theory, I have come across a problem in the writing of my linguistics MSc thesis...

• Replies: 6
• Views: 2,040
11-16-2011, 03:34 PM
55. ### Probability Distribution Function

Hello guys hope you are good, I have a final question. Suppose that the r.v X represents the radius of a ball and that X has probability...

• Replies: 6
• Views: 2,277
12-05-2011, 12:28 PM
56. ### calculate the probability of accident.

Suppose there are seven(distinct) accident occurs in a week. What is the probability that all accidents are occurred on the same day? Pls explain in...

• Replies: 6
• Views: 5,635
12-25-2011, 06:15 PM
57. ### Product Normal Distribution

Hi, Summing normal distributions is nice and easy, providing another normal distribution. But multiplying gives the Product Normal Distribution....

• Replies: 6
• Views: 15,974
01-20-2012, 12:54 PM
58. ### Probably a stupid question

how do i calculate the exact probablity that a number of taxpayers who support a reduction in funding falls between 342 and 375 people? (sample size...

• Replies: 6
• Views: 1,912
01-21-2012, 04:45 PM

I have this question that I believe I have the correct answer for, however, I am unsure as to exactly what the proper formula is (and obviously...

• Replies: 6
• Views: 2,423
01-27-2012, 09:01 PM

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