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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: 30,175
09-30-2005, 09:44 AM
1. ### probability of a random sample without replacement

I'm having problems on how to approach the following question: Suppose that we have a very large collection of marbles, 30% of which are red, 20%...

• Replies: 1
• Views: 4,478
12-03-2010, 06:28 PM
2. ### Random number generation - Use Bernoulli for tennis match series?

Q. The probability of A winning a game of tennis against B is 0.74 Simulate a best of 5 sets (first to win 3) between A and B. Use the following...

• Replies: 3
• Views: 4,475
BGM
04-18-2011, 03:34 AM
3. ### Need help with this problem asap

1. The average number of calls received by a switchboard in a 30-minute period is 15. What is the probability that between 10:00 and 10:30 the...

• Replies: 0
• Views: 4,474
03-30-2008, 08:44 PM
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: 4,473
04-06-2011, 08:19 PM
5. ### Is it possible to calculate a binomial distribution with a non-constant p?

Here's the actual problem I'm faced with. Suppose a segment of dna with 100 mutations (SNPs) which occur at different frequencies from each other and...

• Replies: 4
• Views: 4,469
BGM
08-26-2010, 12:04 AM
6. ### Poisson process, last arrival in interval

Consider a Poisson process with rate lambda. Let L be the following r.v.: if there is an arrival in , then L is the time of the last arrival in ; if...

• Replies: 1
• Views: 4,463
09-02-2010, 08:48 AM

:( I have this statistics problem that i must solve as soon as possible. You have 5 oil paints and 6 water paints. The director of the museum...

• Replies: 3
• Views: 4,461
10-06-2005, 08:46 AM
8. ### question involving standard cauchy distribution

nvm solved it. - X1, X2, X3, ... are independent random variables with a standard Cauchy distribution. Prove or disprove the following. ...

• Replies: 1
• Views: 4,461
09-25-2010, 07:24 PM
9. ### random question about non-Guassian multivariate distributions...

today in my seminar we were talking about all these interesting ways people can start with random uniform distributions and through doing and...

• Replies: 19
• Views: 4,459
03-09-2012, 07:55 PM
10. ### question about a normal distribution probability homework

hello everyone ; glad to be here with you :D i hope you'll help me to resolve this problem exercise : we inform you that's 84,13% of the...

• Replies: 8
• Views: 4,458
12-12-2010, 06:14 PM
11. ### Need Extreme Help!!!

Here is the problem I am having trouble with. A tire company finds the lifespan for one brand of its tires is normally distributed with a mean of...

• Replies: 2
• Views: 4,450
04-26-2008, 07:44 PM
12. ### Hypergeometric distribution - expected value derivation

Hello, I just had a question regarding deriving the expected value of the Hypergeometric(N,M,n) distribution. I know that the expected value is...

• Replies: 3
• Views: 4,449
06-16-2012, 01:30 AM
13. ### Duplicate sample probability

I have a population of N unique items, and I take n random samples (with replacement, so some items may be sampled more than once). If I then take...

• Replies: 8
• Views: 4,448
11-28-2012, 07:37 AM
14. ### Bayesian vs. Frequentist

Hi, I am a college student who has taken a course in frequentist probility learned a little bit of Bayesian probability. I don't know enough to...

• Replies: 8
• Views: 4,446
07-03-2012, 03:43 PM
15. ### probability tree

Suppose 1 in 25 adults is afflicted with a disease for which a new diagnostic test has been developed. Given that an individual actually has the...

• Replies: 0
• Views: 4,445
10-05-2007, 05:51 PM
16. ### Empirical Rule of 68-95-99.7 vs. Corresponsing probability from Z-table

The Empirical Rule states that "Assuming the population exhibit a normal (bell-curved) distribution, about 68.27% of the values lie within 1 standard...

• Replies: 2
• Views: 4,445
02-27-2012, 01:17 PM
17. ### Gamma Difference Distribution

What is the distribution of the difference of two gamma distributions with same scale parameter, and shape parameter of the first one is k(1+e), e ->...

• Replies: 1
• Views: 4,443
BGM
09-19-2011, 10:43 AM
18. ### 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: 4,442
BGM
06-18-2011, 02:25 PM
19. ### probability excel lab

The following lab assignment is really confusing regarding where to begin. I'm not sure if I need to use a formula or if I need to just plug the...

• Replies: 1
• Views: 4,438
03-12-2009, 04:47 PM
20. ### Prob of happening by chance

Say I have 1000 balls. 50% are blue, 50% are red. Someone trys to convince me they can pick red balls from the bag without looking at the balls. ...

• Replies: 9
• Views: 4,437
04-22-2008, 09:16 PM
21. ### A probability/stat elementary problem

Hi, I am currently reviewing probabilities on my own and encountered problems which i can't seem to do. Hopefully someone here will be kind enough to...

• Replies: 2
• Views: 4,436
01-31-2007, 01:54 PM
22. ### circuit failure

A message is transmitted using a binary code of 0's and 1's. Each transmitted bit (0 or 1) must pass through three relays before reaching a receiver....

• Replies: 1
• Views: 4,432
09-11-2007, 12:17 AM
23. ### Confidence Interval homework check if correct

1. 68.6 I did this by solving for x with this equation .004=1.96(.14/sqroot of x) 2.84.72% I found this by finding zscore for 1.43 which was...

• Replies: 5
• Views: 4,432
10-19-2010, 04:56 PM
24. ### Binomial MLE

Hello, I need some clarification on the following problem. Suppose Y ~ Bin (189, 59/189) Graphically show the likelihood function and...

• Replies: 1
• Views: 4,428
10-04-2010, 02:25 AM
25. ### Binomial distributions

A total of 16 mice are sent down a maze, one by one. From previous experience, it is believed that the probability a mouse turns right is .38 a)...

• Replies: 1
• Views: 4,425
10-12-2012, 09:25 PM
26. ### generalized gamma distribution random numbers

Hi there, Does anyone know how to generate random numbers from the generalized gamma distribution?? If you want to check the density take a look...

• Replies: 1
• Views: 4,424
11-03-2008, 07:38 AM
27. ### Probability

Question : Jane wants to do her MSc in statistics. She appliesa to two universities. Assume the acceptance rate at University A is 25% and at...

• Replies: 4
• Views: 4,421
10-15-2006, 05:57 AM
28. ### Bartels: Cycles test of signifcance

I have this pdf doc that explains the formula of Bartels , the test of a cycle significance on a time series. I am trying to put it into excel .....

• Replies: 1
• Views: 4,421
01-22-2013, 04:03 AM
29. ### Normal distribution question

X is normally distributed with mean 100 and variance 81. What is the probability that X will lie between 88 and 112? Here is my approach:...

• Replies: 7
• Views: 4,411
01-12-2011, 05:28 AM
30. ### Binomial Probability, Real Limits, X=0

Can someone have guessed on quiz and got all 50 questions wrong, but still get 100%? Thanks in advance! :D

• Replies: 7
• Views: 4,411
BGM
10-16-2011, 04:36 PM
31. ### System of 5 independent components

I have done problems similar to this one with 4 components but im getting stumped with this one. The probability of FAILURE for each components is...

• Replies: 8
• Views: 4,409
10-12-2010, 09:25 AM
32. ### A probability question

A spider eats 3 flies a day. Until the spider fills his quota a fly has a 50% chance of survival if he attempts to pass the web. Assuming 5 flies...

• Replies: 1
• Views: 4,403
06-29-2010, 12:59 AM
33. ### Probability with sampling question

i have been having problems with what should be a trivial probability problem Suppose there are 130 patients. Each patient was administered one of...

• Replies: 17
• Views: 4,398
08-06-2012, 12:18 AM
34. ### The famous cereal box prizes puzzle

One version says that a cereal company puts four different prizes one in each of all their boxes. The prizes are evenly distributed. How many...

• Replies: 0
• Views: 4,397
10-01-2010, 02:33 AM
35. ### Transition Probability

Hi. I have a question about transition probability. Q) Markov chain on states {0,1,2,3,4,5} has transition probability matrix (which is 6 by 6...

• Replies: 7
• Views: 4,395
11-03-2010, 05:46 PM
36. ### problems with MGF

Here are 2 similar kind of problems regarding MGF. So I'm posting on the same thread. Hope there is no problem. 1)MGF of a rv is given by...

• Replies: 1
• Views: 4,395
BGM
01-04-2011, 10:08 AM
37. ### Help with A HOMEWORK PROBLEM

Hello to all Daryl shuffles a standard deck of cards (13 cards in each of four suits) and draws one card. Then Daryl replaces the card, shuffles...

• Replies: 14
• Views: 4,393
01-12-2009, 10:36 AM
38. ### Probability

Hello to everyone... I'm very new to stats and have worked through my assignments but am not sure I'm on the right track. The question is: Two...

• Replies: 5
• Views: 4,386
10-24-2005, 10:36 PM
39. ### 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: 4,385
12-28-2009, 12:30 AM
40. ### 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: 4,385
12-26-2009, 11:04 PM
41. ### I have questions ??

Hi I have 3 questions. Let x1, . . . , xn be independent observations of a chi-square(k) random variable, with p.d.f. f(x)= 1/(2^k/Γ(k/2)) ...

• Replies: 1
• Views: 4,385
BGM
11-25-2010, 03:08 AM
42. ### "Six nines" reliability vs. safety factor

Aircraft are supposed to have a 99.9999 % chance that they will work over some specified time interval. If a picture weighs 25# and you want the...

• Replies: 3
• Views: 4,385
05-20-2011, 06:05 PM

need help understanding this question please? the number of lightning strikes on a square kilometer of open ground in a year has mean 6 and standard...

• Replies: 1
• Views: 4,384
10-25-2011, 02:35 AM
44. ### Probability for 20 people

Hi, I'm not a stats student, I'm a university student reviewing some literature and I'm interested in some of the statistics related to it and how...

• Replies: 5
• Views: 4,377
12-16-2010, 06:55 PM

Last year 75% of Kmart Department Stores credit card purchases were for less than $150. In a random sample of 200 credit card companies, what is the... • Replies: 2 • Views: 4,374 12-05-2010, 08:03 PM 46. ### circular permutation Hello: I have a probability problem I would like some takes on, please. "There are 5 boys and 3 girls sitting around a circular table. What is... • Replies: 5 • Views: 4,373 08-17-2006, 09:41 AM 47. ### What is meant by mod X(i,j)=k mod 4, Where (i,j=1,...6) & k=i+j Everything is clear, but what is meant by mod 4 here? • Replies: 2 • Views: 4,371 09-21-2010, 02:27 AM 48. ### Normal Distribution Problem Hi, I've been working on this problem for a while now and keep getting stuck. The problem says, The length of time before a cell phone using a... • Replies: 1 • Views: 4,368 07-03-2007, 01:37 PM 49. ### defective parts The ABC manufacturing company purchases a certain part from two suppliers (A supplier & B supplier). The parts received from the suppliers are used... • Replies: 0 • Views: 4,368 07-10-2009, 01:29 PM 50. ### Probablity Challenge can anyone solve this??? Assume 2 gamblers, Max and John, bet$1 on successive tosses of a fair coin, and each has \$6 to start with. a) what is...

• Replies: 3
• Views: 4,368
11-13-2009, 04:13 PM
51. ### A Problem on Joint Probability Distribution

Hello people, I found this problem in an exam but i could not go very far on this. Problem: Let X and Y be jointly distributed random variables...

• Replies: 4
• Views: 4,368
07-12-2013, 10:20 PM
52. ### fizz fizz away

okay one more for you that i think I know the answer. i apologize if these must seem easy and I may seem :confused: but hey i am not the brightest...

• Replies: 1
• Views: 4,362
10-07-2005, 08:57 PM
53. ### sealed bid problem

Your company is making a sealed bid for a construction project. If your firm has the lowest bid, you will pay another firm (a subcontractor) 140...

• Replies: 1
• Views: 4,362
02-26-2008, 05:27 PM
54. ### expectation of conditional probability

Hi there, I have two questions which I found answers to slightly different version of them in books but not to those that I have in mind so please...

• Replies: 12
• Views: 4,362
BGM
08-25-2011, 02:09 PM
55. ### finding MLE

f(x,y)=\frac{\theta}{4}, if (x,y)=(0,0),(1,1) =\frac{2-\theta}{4}, if (x,y)=(0,1),(1,0) Find MLE of \theta where 0\leq\theta\leq 2

• Replies: 8
• Views: 4,361
05-13-2011, 08:05 AM
56. ### Stats Homework

I am getting ready for my test in a couple of hours actually, but I have a practice test I am attempting now. Their are 2 problems I can't seem to...

• Replies: 1
• Views: 4,357
03-21-2006, 09:01 PM
57. ### Chi Squared : Explaining the numbers

Hello! Thank you in advance for your help and I hope I have posted this in the correct section. My question involves verbally explaining chi...

• Replies: 2
• Views: 4,357
04-11-2012, 02:49 AM
58. ### How to determine data has Poisson Distribution

Hi there Can some one suggest me how i can determine data has poisson distribution? Actually i want to analyze the relationship between these...

• Replies: 0
• Views: 4,352
05-08-2009, 10:52 PM

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