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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: 30,184
09-30-2005, 09:44 AM

1) Consumer in a supermarket, 20% buy 10 items or less, 70% spend more than $10, and 68% spend less than 10 dollars and buy more than 10 items. what... • Replies: 2 • Views: 3,619 11-09-2010, 04:34 PM 2. ### [Question] Birthday Problem Here is the problem, I already get the answer, \frac{r}{365 -365(\frac{364}{365})^s} What do you think? • Replies: 1 • Views: 2,429 10-26-2011, 12:04 PM 3. ### [Question] "Supermatch" cards problem Dear everyone, I have a question that i couldn't figure out clearly. Here is it. Here will i write down what i have been done, and please... • Replies: 1 • Views: 2,315 BGM 10-25-2011, 02:07 AM 4. ### [Likelihood of embedded Markov chain] Likelihood of Goldman Yang (GY) rate matrix This question concerns defining the likelihood of a set of parameters in a rate matrix of an embedded Markov chain. To get a brief idea of the... • Replies: 0 • Views: 1,424 12-17-2012, 11:52 AM 5. ### [Homework help] Binomial distribution questions After the BP oil crisis in the Gulf, sixty percent of Americans are in favor of the government’s moratorium on deepwater oil drilling. Out of the... • Replies: 9 • Views: 4,161 09-03-2010, 04:47 PM 6. ### [Gamma Distribution] Generate random number according to Gamma Distribution Hi, I request your help / suggestion to solve the following problem Suppose X_i, i=1,2,...,n are exponential RVs with mean 1/k. If the triggering... • Replies: 3 • Views: 2,166 BGM 10-25-2012, 03:54 AM 7. ### [Discrete Probability Function] P(X²=1)= P(X=1) U P(X=-1)? I would like to know if this following form of interpretation is correct: ========================== Suppose I have a discrete probability... • Replies: 1 • Views: 1,038 04-18-2017, 09:18 AM 8. ### [ASK] Doctrine of Chances by Abraham de Moivre Doctrine of Chance is a book published by Abraham de Moivre in 1718. It was on the sbuject of probability containing many innovations such as method... • Replies: 0 • Views: 1,623 01-09-2015, 10:29 PM 9. ### [ASK] Combination? 5. A bag contains 7 red marbles and 5 yellow marbles. From the bag, 3 marbles are taken randomly at once. How many ways exist if all 3 taken marbles... • Replies: 0 • Views: 1,018 03-10-2015, 09:56 PM 10. ### [ASK] Combination: Am I Doing This Right? Among 10 candidates of Students Council members, 3 people will be selected to undergo training. The number of possible ways to do so if 1 candidate... • Replies: 2 • Views: 1,488 02-17-2015, 10:06 PM 11. ### Ztable probability, Please Help Im looking back over an old assignment and I cant figure out how to get the correct probability Question: what is the probability of encountering... • Replies: 3 • Views: 2,250 10-26-2008, 02:37 PM 12. ### zmoggggg -- Continuation of Poisson question, please verify and advise ok so lambada value here =4 (Average of 240 planes in 1 hr) and for the following question a) atleast 1 plane arrives during the 10-minute... • Replies: 2 • Views: 2,156 11-06-2008, 01:50 PM 13. ### zero inflated poisson distribution I am new and I hope I'm abiding to the rules. I just wanted to know what exactly a zero inflated Poisson distribution is? How is it related to the... • Replies: 2 • Views: 6,375 03-16-2010, 09:21 AM 14. ### Z-values and probability Suppose concentration of arsenic (in ppb) in groundwater sampled quarterly from a particular well can be modeled with a normal distribution with a... • Replies: 0 • Views: 1,312 03-09-2014, 07:30 PM 15. ### z-test for a proportion Please help... Lets say that I have developed a new method and software prototype that aims to significantly reduce the ambiguity inherent in... • Replies: 1 • Views: 4,087 05-29-2008, 07:40 AM 16. ### Z-scores for probability in tails I haven't done any stats in years and now I am in a course for my grad program and I am so lost. My teacher is very confusing and I am trying my best... • Replies: 3 • Views: 23,882 10-16-2008, 06:45 AM 17. ### Z-scores & Central Limit Theory I have been trying to work on my stats for a right long time now. I can't figue out this one question in my textbook. I don't understand or even know... • Replies: 1 • Views: 6,726 11-05-2010, 08:04 PM 18. ### Z-score from a negative x value Hello, I am trying to calculate the z-score for a normal random variable(x), which has a negative value. I know the formula. If x < 3.4 the mu... • Replies: 1 • Views: 2,520 BGM 11-19-2013, 08:58 PM 19. ### Z test Hi , i have a question regarding z test and testing at 5% level. If sample size is 60 S=11.7 X=42.8 and i use formula Z= X-mu ... • Replies: 3 • Views: 1,891 el1 04-22-2008, 07:06 PM 20. ### Z tables Can someone tell me what Z upper and Z lower values are? I am trying to find theoretical parts out of spec. The specifications are -.30 to .30 with... • Replies: 5 • Views: 6,659 01-12-2006, 12:31 PM 21. ### Z Table Lookup Question I have the following practice question: P(-3.80<z<-2.40) Why is the answer .0081? How do I find that? • Replies: 2 • Views: 3,036 09-02-2006, 06:00 PM 22. ### z standard normal First part of the question asks..if X is normal with mean = 8.48 and sd = 1.6, what are the 2 values of X which include central 80% of probability? ... • Replies: 1 • Views: 5,424 04-11-2008, 07:18 AM 23. ### Z Scores Probabilty...Can anyone help? Hey, Here is the question, I need some serious help!!!! A soft drink machine can be regulated so that it discharges and average of µ per cup. If... • Replies: 4 • Views: 2,140 03-10-2008, 08:51 AM 24. ### Z scores .. please help 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: 3,066 01-06-2010, 02:00 PM 25. ### Z score question Hello there was wondering if someone could help shed some light on this question for me..any help would be greatly appreciated.. The mean height... • Replies: 3 • Views: 3,517 09-03-2006, 08:52 AM 26. ### z and standard normal variable... I have a question on my homework...I'm not looking for the answer, just how to find it... If Z is a standard normal variable how would you find the... • Replies: 1 • Views: 3,286 12-10-2007, 02:49 PM 27. ### Yikes help! There are two boxes, Box A and Box B. • Box A contains seven$1 tags, six $5 tags, four$10 tags, two $15 tags, and one$20 tag. • Box B contains...

• Replies: 0
• Views: 1,755
06-06-2008, 09:05 AM
28. ### Yet more problems!!!

OK. Like I said. I am really struggling with this. Here are two more I can't grasp. 1. You are fishing at a Reservoir. The Department of...

• Replies: 0
• Views: 2,070
04-15-2006, 07:08 PM
29. ### Yet another "flipping" coin problem

Hi folks, So we flip two balanced coins. If at least one of them shows tails what is the probability that the other coin is also tails? My answer:...

• Replies: 4
• Views: 3,493
04-12-2011, 08:15 PM
30. ### Yet (another) derivation from linear mixed effects regression...

hello there... first of all, thank you very much to everyone who has replied to my questions and has helped me understand these things a little bit...

• Replies: 3
• Views: 2,021
09-28-2011, 08:07 PM
31. ### y follows a Poisson distribution with rate lambda*x

Assume that the number of faults in the roll, say y, follows a Poisson distribution with rate lambda*x, where x is the length of the roll. Does this...

• Replies: 4
• Views: 6,339
12-05-2010, 05:27 PM
32. ### Xn~Exponential(.5) -> Xn~Normal. Use Chebychev's inequality

Xn are iid Exponential(.5). After using the central limit theorem, Xn is Normally distributed. Use chebychev's inequality to find out how large n be...

• Replies: 6
• Views: 2,254
10-20-2012, 03:01 PM
33. ### X=0 almost surely => E(X)=0

Axioms of expectation: 1. X>0 => E(X)>0 2. E(1)=1 3. E(aX+bY) = aE(X) + bE(Y) 4. If X_n is a nondecreasing sequence of numbers and lim(X_n) = X,...

• Replies: 14
• Views: 4,510
07-20-2009, 12:59 AM
34. ### X and Y is independent. I didn't say that X and Y is conditional independent given Z.

X and Y is independent. (Note that I didn't say that X and Y is conditional independent given Z.) Still pr(X|Z) * pr(Y|Z) = pr(XY|Z) is always...

• Replies: 1
• Views: 2,309
BGM
04-25-2012, 02:34 AM
35. ### X + a log X, where X~Gamma

Does anybody know anything about the distribution of X + a log X, where X is a gamma distributed random variable and a is constant?

• Replies: 7
• Views: 3,916
02-09-2009, 12:45 PM
36. ### Writing a book - need help!

I am writing a book on double deck pinochle and need to get accurate percentages. I am hoping this forum is willing and able to help me! If I am in...

• Replies: 8
• Views: 3,924
BGM
08-05-2010, 12:21 AM
37. ### would some one confirm my answers

1-Many universities require a student to take a math placement test as well as computer science placement test.80% of the students who take both...

• Replies: 2
• Views: 2,079
03-01-2008, 05:06 PM
38. ### Would love some assistance with understanding this puzzling probability "game"

Hello everyone, This is my first post here, so please be gentle :). I'd like to thank everyone in advance for any help that can be given. ...

• Replies: 3
• Views: 1,600
07-05-2014, 06:18 PM
39. ### World Cup - a simple probability question

Hi All I hope this is not considered too far outside the purpose or spirit of this site! I haven't touched statistics since doing A level...

• Replies: 2
• Views: 2,545
06-21-2006, 10:50 AM
40. ### Working out probability for this game

Rather confusing game ive started playing in the streets. I've been making alot of money from a game called high dice. A 6 sided dice is rolled...

• Replies: 2
• Views: 1,602
12-31-2011, 10:05 PM
41. ### word problems

Here are a few more questions that I got wrong and need help figuring out if anyone could help. Question 1: The length of time for students to...

• Replies: 3
• Views: 4,041
05-19-2006, 12:21 PM
42. ### Word problem needs double checking.

There are 10 seniors, 8 juniors, 5 sophomores and 3 frshman on student council. A committee of 6 members is formed. a.p(all seniors) b.p(3...

• Replies: 2
• Views: 1,461
05-10-2013, 02:16 PM
43. ### wishart distribution and correlation matrix???

hey there everyone! just a quick question.... you see how the sampling distribution of the covariance matrix follows a wishart distribution (for...

• Replies: 7
• Views: 8,930
Lep
09-16-2013, 03:01 AM
44. ### win money

A man won money when he bet unsuspecting patrons that in 4 rolls of a die, he could get at least one six, but he lost money when he bet that in 24...

• Replies: 1
• Views: 2,048
10-05-2006, 06:47 AM
45. ### Will two Independent Variables transformed into two functions remain independent?

X & Y are independent variables. X ~ Bernoulli(1/2), Y ~ Bernoulli(1/3). Let Z = X + Y and W = X - Y. Compute Cov(Z,W) and Corr(Z,W). Am I...

• Replies: 16
• Views: 3,025
10-07-2012, 11:36 PM

I am trying to finish my thesis for my Masters in Civil Engineering and have run into a statistics/ probability question which my one Engineering...

• Replies: 6
• Views: 2,738
02-05-2009, 06:45 PM
47. ### Will rounding off Standard Deviation Bins cause error on Histogram?

I am creating a Histogram. I have about 100 points of data and I am using MS Excel's Histogram function to create the "Bins". The data points I have...

• Replies: 4
• Views: 6,657
06-30-2010, 11:34 AM
48. ### Will passing the Actuarial Exam 1/P help in other professions?

I wasn't sure what other thread to ask this in, so I figured probability was relevant. I've been studying for the 1st actuarial exam 1/P for a year,...

• Replies: 1
• Views: 1,215
10-23-2012, 11:55 AM
49. ### Will decision on H0 depend on Ha

In testing of hypthesis , will the decision of whether to accept or reject depend on the tail of the test ? That is suppose Ha M<0 and Ha!=0. In...

• Replies: 3
• Views: 2,248
BGM
12-01-2011, 02:02 AM
50. ### wikipedia entry

I was reading about false positive and found this wikipedia entry, can this be true? how come probability is greater than 1?

• Replies: 4
• Views: 2,987
09-20-2010, 08:42 AM
51. ### Wigan scores after 30 minutes. Calculate home, away and draw in percentage terms.

Wigan V City Wigan scores after 30 minutes. Calculate home, away and draw in percentage terms. Please advise how to proceed with this question...

• Replies: 8
• Views: 1,917
01-14-2013, 06:46 PM
52. ### Why this Frequency Polygon is not correct?

Hi guys! I stumbled upon this blurry question from one of my lab old exams, in statistics elective course. I will leave you to check the...

• Replies: 0
• Views: 930
10-21-2014, 02:40 AM
53. ### why should the I use a t distribution? (theory question)

Hello I would like some help with the theory behind the t-test. I know how to technically perform a t-test but something in the logic doesn't add...

• Replies: 5
• Views: 7,320
BGM
05-19-2010, 01:15 PM
54. ### Why is this question not Binomial?

Hi, "A fair coin is tossed three times. What is the probability of two or more heads, given that there was at least one head?" Why is this not...

• Replies: 1
• Views: 1,024
BGM
01-15-2013, 12:29 PM
55. ### Why is a Dynkin system not a Pi-system?

This appears to be the only difference between a sigma-algebra and a Dynkin system: Sigma-algebra is closed under countable union Dynkin system...

• Replies: 0
• Views: 1,602
05-25-2012, 08:59 AM
56. ### Why doesent MLE equal in normal distribution when mean = variance?

Sadly I´m not familiar with LaTex so I have attached my question as a picture. I have tried the best I can, but now I´m stuck :(

• Replies: 11
• Views: 1,853
03-12-2016, 01:24 AM

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