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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
1. ### is causal & invertible Gaussian ARMA(p,q) process strictly stationary?

I have the definition of strict stationary, and causal/invertible ARMA(p,q) process. However, I'm having trouble connecting the dots. We know that...

• Replies: 0
• Views: 4,284
08-12-2010, 03:57 PM
2. ### Probability of FTSE 250

My Quantitative Methods exam is tomorrow and I really need help with this question, in case this question comes up in the exam. The question is...

• Replies: 1
• Views: 2,167
08-11-2010, 02:58 PM
3. ### Mutually Exclusive

I can't seem to remember how to determine what P(A|B) is if the two events are determined to be mutually exclusive with probabilities P(A)= 0.3 and...

• Replies: 2
• Views: 2,507
08-10-2010, 04:41 PM
4. ### Interesting Problem

Anyone know how to do PART II ? PART I. A plant produces bearings with a specified 1-inch mean diameter. The standard deviation for all bearings...

• Replies: 2
• Views: 3,252
08-10-2010, 03:11 PM
5. ### Chance level binomial, not 1/n

I have some data which I am going to performed a mixed ANOVA on, however, I think I might need to transform the raw data, but am not sure how to. ...

• Replies: 5
• Views: 3,967
08-10-2010, 09:43 AM
6. ### 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: 2,876
08-09-2010, 08:46 PM
7. ### Game Entry Statistics

I am trying to figure out the method of calculating the number of times that a certain game must be entered in order to advance to a specific level...

• Replies: 3
• Views: 3,188
08-09-2010, 01:54 AM
8. ### 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: 6,409
08-08-2010, 04:44 PM
9. ### Probability of catching a chicken

I have changed this question a bit to make this more interesting, but if I can answer this then I can answer my actual one! I have a net that I...

• Replies: 2
• Views: 2,610
08-06-2010, 10:59 PM
10. ### 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: 4,527
08-06-2010, 10:25 AM
11. ### Probability Question

A question in a tutorial I had was: A bank manager is presented with the details of ten accounts of which two are overdrawn. If he selects three...

• Replies: 9
• Views: 3,029
08-05-2010, 05:29 PM
12. ### Expectation Operator

I understand the Expectation (and the expectation operator) in a very crude sense. For example, when applied to both discrete or continuous...

• Replies: 2
• Views: 7,118
08-05-2010, 11:49 AM
13. ### 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: 3,977
BGM
08-05-2010, 12:21 AM
14. ### probability ques.

a publishing company holds a sales contest in which the top 6 performers out of 97 sales reps receive prizes ranging from a trip to ireland for the...

• Replies: 5
• Views: 2,494
08-04-2010, 01:32 PM
15. ### Probability Question

Hello, I need a wee help with this question... "A company that repair computers go with the next sale: If the waiting time of a customer for...

• Replies: 7
• Views: 2,606
BGM
08-04-2010, 11:11 AM
16. ### Binomial probability problem

I have a problem working out the answer to this problem using the binomial formula. Assume an airline operates a short haul flight form Edinburgh...

• Replies: 4
• Views: 3,285
08-04-2010, 10:57 AM
17. ### 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: 10,029
08-04-2010, 09:59 AM
18. ### Probability Function

Good afternoon people, May I ask for a little assistance solving this exercise ? Thank you... A factory produce pens, with black ink and blue...

• Replies: 3
• Views: 2,458
08-04-2010, 02:52 AM
19. ### Questions (hopefully easy?)

It’s been a while since I’ve done much probability stuff, but I’ve come across a problem in some auction theory work that I’m doing and was hoping...

• Replies: 1
• Views: 2,171
BGM
08-03-2010, 10:31 PM
20. ### Probability Problem

I am not sure where how to do this problem. This is what is says Suppose someone passes you a six sided die and bets £100 that you will through...

• Replies: 1
• Views: 2,064
08-03-2010, 06:52 PM
21. ### An abstract mortality question

A few days ago a 48 year old man died and a 65 year old man did not die. I'm familiar with the mortality tables and the likelihood of, in the US,...

• Replies: 2
• Views: 3,018
08-03-2010, 02:09 PM
22. ### Simple question but cant figure it out

A = a random number between x and 100 B = a random number between y and 100 What is the chance that A has a higher number than B? Solution...

• Replies: 1
• Views: 3,338
08-03-2010, 12:48 PM
23. ### Determining number of samples to collect

Hi, I am doing a project in determining if there is a statistically significant difference between conducting a particular type of cleaning process...

• Replies: 1
• Views: 3,518
08-03-2010, 12:11 PM
24. ### Poisson distribution

The number of cars that pass Bill's house between 8.00am and 9.00am on a normal week day follows a poisson process with rate 6 cars every 5 minutes....

• Replies: 2
• Views: 3,417
08-03-2010, 10:13 AM
25. ### Statistics question for algorithm development

Hi, This isn't a homework help question. I'm actually trying to figure out some formulas for algorithm programming. I'm trying to calculate...

• Replies: 0
• Views: 2,286
08-02-2010, 04:33 PM
26. ### Joint Distribution

Hello, I got this question plus a solution and I think the solution is wrong, I would like to see your solution.... The CD's produced by a company...

• Replies: 0
• Views: 2,101
08-02-2010, 03:49 PM
27. ### approximating density function for a non-normal distribution

Hello, My question is actually quite short, but I'll have to start by describing the context since I am not sure how to directly ask it. ...

• Replies: 1
• Views: 4,028
08-01-2010, 11:18 PM
28. ### Bound on the difference of two normal cds

Let Xi be univariate normal variables with means mi and standard deviations di, with i = 1,2. Suppose |m1-m2| < e1 and |d1 - d2| < e2. I need an...

• Replies: 2
• Views: 2,922
08-01-2010, 04:30 PM
29. ### Rotated Ellipses

Hi all, I've been thinking about this problem for a while, and I haven't been able to find a good starting point. This may be more of a...

• Replies: 0
• Views: 2,490
07-28-2010, 09:49 AM
30. ### 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: 2,772
07-27-2010, 11:02 PM
31. ### Settle an Argument

A social club has a daily contest where they draw a name from a list of all of the club members. A name is drawn each day. In order to win, you must...

• Replies: 19
• Views: 5,571
07-27-2010, 07:22 PM
32. ### Binomial distribution confusion.

Hello all. I am having a bit of confusion taking the conditional expectation of a binomial cumulative distribution. Lets say the probability of a...

• Replies: 1
• Views: 3,023
BGM
07-27-2010, 03:03 AM
33. ### Multinomial Distribution - difficult question - SOS

This has to do with statistics,but the question I don't know the answer to is in probability. I don't know how to solve (b) Please help...

• Replies: 0
• Views: 3,089
07-25-2010, 04:59 AM
34. ### equip. failure

A widget fails each month for six months. A fix is then installed. How many months of no failures would need to go by before I can be 95%...

• Replies: 5
• Views: 3,154
07-23-2010, 10:52 AM
35. ### help -probablity problem

Hello every one , i just registered to this forum .Currently i am studying stats , Can you please help me on how to solve bellow problem : ...

• Replies: 2
• Views: 2,804
07-23-2010, 10:12 AM
36. ### what's the probability that x^2+bx+c=0 has real root?

can any one answer this one?

• Replies: 3
• Views: 4,581
BGM
07-20-2010, 05:47 AM
37. ### Uniform Continuous Probability

Hi all, The question i have has these givens: t = years f(t) = 10(1-5t) for 0=< t =< 1/5 a) What is probability that a machine will last...

• Replies: 5
• Views: 5,204
07-19-2010, 11:18 PM
38. ### This is probably easy for you

I am not a statistics person. A friend of mine and I were chatting over a beer and were trying to figure the following problem out. Given our lack...

• Replies: 2
• Views: 3,452
07-19-2010, 02:32 PM
39. ### technical VS biological replicates (compare means)

Hi, I have conducted an experiment with an assay for 2 biological classes, each consisting of 10 unique members. I did the assay 3 times for a...

• Replies: 4
• Views: 14,044
07-18-2010, 05:49 PM
40. ### Distribution Fitting Question

Hi Math Experts, I have a two part question: Let's say I have a set of data and I want to fit a distribution to it, but I have to get rid of all...

• Replies: 2
• Views: 3,582
07-18-2010, 04:28 PM
41. ### Percentiles question

Hi, I'm a novice at probability theory and am hoping for some help on a betting question. If I place a losing bet then the loss will always be...

• Replies: 1
• Views: 3,226
07-16-2010, 08:10 PM
42. ### 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: 13,144
07-16-2010, 02:05 PM
43. ### Bejeweled Combos

Hi all, Many of you I assume are familiar with Bejeweled, a puzzle game in which the player swaps neighboring, colored gems in an 8 x 8 grid to...

• Replies: 2
• Views: 4,065
07-16-2010, 12:08 PM
44. ### A probability question

a stick of length 1 is cut twice randomly, probability that 3 segments can form a triangle? x,y, 1-x-y x+y>1-x-y ==> x+y>1/2 1-x-y+x>y ==>...

• Replies: 5
• Views: 3,301
BGM
07-16-2010, 12:01 PM
45. ### 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: 9,184
07-15-2010, 07:36 PM
46. ### Normal distributions

I have been using my TI 84 Plus Silver Edition calculator to try and figure this out with no luck :-( Can anyone help? Assume that the heights of...

• Replies: 7
• Views: 5,873
07-15-2010, 01:58 PM
47. ### testing hypotheses

Out of an i.i.d sample, with N = 200, and a sample mean of 7000 and sample variance of 700, how would you answer the following question, At 5%...

• Replies: 5
• Views: 3,305
07-14-2010, 05:20 PM
48. ### Game Probability

Hi All - I have not looked at statistics or probability for a number of years but am wondering if someone can provide me with a formula for figuring...

• Replies: 4
• Views: 4,067
07-14-2010, 12:26 PM
49. ### question about binomial distribution

If the probability distribution of Y is defined by a binomial distribution, what would be the limiting distribution of Y/n as n approaches infinity?...

• Replies: 3
• Views: 4,099
07-13-2010, 09:26 PM
50. ### Discrete Random Variables

Its asking to complete the chart. Since its probability I added it up to have a one but the other chart has a negative does that mean that it can't...

• Replies: 4
• Views: 3,284
07-12-2010, 09:10 PM
51. ### simple chi-squared problem

This is probably a very simple problem Y is distributed by the chi-squared distribution with 5 degrees of freedom. Calculate the probability that...

• Replies: 2
• Views: 2,937
07-12-2010, 09:00 PM
52. ### Maximum of a set of independent normal random variables

Consider a set of random variables X_1, X_2, X_3, \ldots, X_n with unit varience but different means: \mu_1, \mu_2, \mu_3, \ldots, \mu_n . What...

• Replies: 20
• Views: 20,571
07-12-2010, 03:45 PM
53. ### Transformations

Hi! Suppose X ~ U(0,1). If we let Y = -ln (x) and then find the density of Y, we get the exponential distribution (with rate parameter = 1). ...

• Replies: 4
• Views: 4,619
07-12-2010, 03:28 PM
54. ### Gambler's fallacy

Hi everybody. I have a question about the gambler's fallacy application. I have this board game called "Talisman", where each player has an attribute...

• Replies: 10
• Views: 3,866
07-11-2010, 11:44 PM
55. ### Conditional Probability

What is the chance that the seventh card from the top of the deck will be a heart? This question really stumped me. I thought and then divided by...

• Replies: 5
• Views: 4,633
07-11-2010, 02:49 PM

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