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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: 30,234
09-30-2005, 09:44 AM
1. ### Probability Conjecture

" it has been found that with the standard dosage of a drug, the change in a persons uric-acid level has mean=250 and standard deviation = 50. A new...

• Replies: 1
• Views: 2,246
03-27-2012, 09:37 AM
2. ### 97th percentile

"suppose the moisture content per pound of a dehydrated protein concentrate is normally distributed with a mean of 3.5 and standard deviation of 0.5....

• Replies: 5
• Views: 7,466
03-26-2012, 10:34 PM
3. ### Normal Distribution Question.

Hello everyone! Thanks in advance for any help you can give me. I am in my first year of college, currently taking a MAT 103 class (Quantitative...

• Replies: 1
• Views: 6,146
03-26-2012, 04:32 PM
4. ### Horse Racing Stats question

not sure this is the correct area so forgive me. my boyfriend is an avid horse racing fan and created pretty accurate measurements as far as...

• Replies: 0
• Views: 2,241
03-25-2012, 04:58 PM
5. ### Red fish, golden fish, probability.

Hello, can you help me with these exercises? A hint would be useful :) 1) A pond contains red and golden fish. There are 3000 red and 7000 golden...

• Replies: 1
• Views: 2,273
BGM
03-25-2012, 06:16 AM
6. ### Determining on Probability from multiplt associative probabilities

Hi, I have a question regarding the associative laws of probabilty. Basic question is that I need to find the probability of a player X...

• Replies: 0
• Views: 1,102
03-24-2012, 12:09 AM
7. ### Rick Durrett definition of markov property

Dear forumers This is my first post - I hope this is the right place for the post and that this forum covers these kind of questions. I have...

• Replies: 0
• Views: 1,849
03-23-2012, 01:52 PM
8. ### Collect answers and determine probability

Hello! I'm trying to figure out a method to predict the most probable answer taking into account previous answers collected in a database. ...

• Replies: 0
• Views: 1,299
03-22-2012, 12:10 PM
9. ### Real world statistical/probability question.

Hi I have a question relating to probability from normal distributions. My field is customer service in manufacturing industry and I am...

• Replies: 0
• Views: 1,707
03-22-2012, 04:26 AM
10. ### probability for the event

Hi I have numbers 0-200. If I randomly choose one, what is the probability for the event that value of the chosen number is less than 120? My...

• Replies: 2
• Views: 2,069
03-20-2012, 09:51 AM
11. ### binomial probability

ok so here is the question i attempted but no getting the answer a loan officer has indicated that 80% of all loan application forms have zero...

• Replies: 0
• Views: 2,414
03-19-2012, 06:48 PM
12. ### Building a Multivariate Exponential Distribution...

hey everyone! so when i asked about the Multivariate Poisson i was pointed in the right direction and was able to come up with a much decent answer...

• Replies: 2
• Views: 4,213
03-19-2012, 06:44 PM
13. ### Confidence Intervals using Most Likely Estimators

I have data that follows an exponential distribution. I need to find a 95% confidence interval of the following (using the MLE function): 1. The...

• Replies: 3
• Views: 1,806
03-18-2012, 03:37 PM
14. ### Mann Whitney vs Kolmogrov-Smirnov Z ?

Hi forum, I'm brand new here. :wave: I'm working on my master's thesis in behavioral finance. I'm trying to ascertain whether temperature has an...

• Replies: 2
• Views: 1,952
03-17-2012, 05:21 PM
15. ### Question about hitting times for strong Markov Processes

Suppose X is a strong Markov process on (Omega, F, P_x) with right continuous sample paths (assume X takes values in R). Suppose that Law (X | P_x)...

• Replies: 0
• Views: 1,714
03-17-2012, 08:02 AM
16. ### Building a Multivariate Poission Distribution....

hello peeps. i know i haven't posted in like ages but i've been very, very VERY busy lately so i hope i get more time once the semester ends. ...

• Replies: 5
• Views: 3,063
03-16-2012, 01:03 PM
17. ### probability of underestimating regression estimate

Dear all, This is a really basic question but I am stuck for some reason. Technically this is econometrics, but the question involves probability...

• Replies: 0
• Views: 1,240
ida
03-15-2012, 06:51 PM
18. ### incremental Mutual information

I computed Mutual information between two variables X and Y from data D at time t. I(X,Y) from D. Now at time t+1 new data arrived so, how i...

• Replies: 0
• Views: 1,667
03-15-2012, 05:53 PM
19. ### Probability Distribution Function

Hi Every one. Can any one help me to start solving this problem?i am stocked in the beginning. The range of a ballistic projectile is given by ...

• Replies: 6
• Views: 2,131
03-15-2012, 03:49 AM
20. ### Help with normal approximation to the binomial distribution

Hi all, I need help with a question I have for class. The question is: The the normal approximation to the binomial distribution to estimate the...

• Replies: 2
• Views: 2,602
03-14-2012, 02:52 AM
21. ### Confusion about binomial and hypergeometric

I have a question. Let's say only 15 out of 50 job candidates can get the job at a company. (30%) Would an individual prefer sampling WITH...

• Replies: 0
• Views: 1,215
03-13-2012, 11:49 PM
22. ### Probability

Here's the question I've been working on for hours now... Experience of the coach concluded that fifty percent of the players who attempt to...

• Replies: 4
• Views: 2,039
03-13-2012, 09:50 PM
23. ### Probability Density Problem

Can you figure this out? A New Distribution. Consider the probability density function f(x) =(a/a+1)((ln(ax)+(1/x)+ln(a))) and...

• Replies: 1
• Views: 2,437
03-12-2012, 08:07 PM
24. ### Puzzling problem

King Zack's kingdom is on the brink of war with the neighboring kingdom of Yarmouth. King Zack has three advisors, Alfred, Belle, and Chris. ...

• Replies: 3
• Views: 1,510
03-12-2012, 01:48 PM
25. ### Binomial probability

Hello!! My question is: Only 30% of the people in a large city feel that mass transit system is adequate. If 20 different persons are selected at...

• Replies: 11
• Views: 4,145
03-10-2012, 06:57 PM
26. ### 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: 4,481
03-09-2012, 07:55 PM
27. ### lock combinations Q- for fun, not work

Suppose I want to crack a safe. What I know: The lock has numbers ranging from 0-75 The numbers can be repeated What I don't know: Whether...

• Replies: 0
• Views: 1,588
03-09-2012, 05:34 PM
28. ### Baye's Rule Help

Hello I have this question and I am having trouble figuring it out. Medical case histories indicate that different illnesses may produce...

• Replies: 3
• Views: 4,759
BGM
03-09-2012, 12:43 PM
29. ### Random Variable with normal distribution

I am stuck on this problem. Mean of 50, standard deviation of 10. What is the probability the random variable will assume a value between 45...

• Replies: 1
• Views: 2,574
03-08-2012, 03:40 PM
30. ### Probability Only With Return Rate?

It is asked that, Printed Circuit Boards (PCB's) are used in virtually all electronic goods (PC's, cell phones, etc). The facility producing PCB's...

• Replies: 2
• Views: 2,039
03-08-2012, 02:42 PM
31. ### Advantage of reducing process variation?

The question is, "What is the advantage of reducing process variation, thereby causing process control limits to be at a greater number of standard...

• Replies: 4
• Views: 8,154
03-08-2012, 02:30 PM
32. ### probability density function questions...

Suppose X selects an integer, x, uniformly from the set S = {0,1,...,9}. Then Y selects an integer uniformly from {0,1,...,x^2}. Find: (a) f(x,y) ...

• Replies: 1
• Views: 2,139
03-08-2012, 12:14 AM
33. ### Probability with Mice

My question states: Suppose 9 mice are available for a study of a possible carcinogen and 4 of them will form a control group. Assuming that a...

• Replies: 4
• Views: 2,824
03-07-2012, 03:49 PM
34. ### Another probability...

My question: An advisory committee on prison reform consists of 15 members. 9 favor, 4 oppose and 2 are indifferent about a certain program. If we...

• Replies: 2
• Views: 2,020
03-07-2012, 03:33 PM
35. ### How do you find best probability density distribution for a data set?

How do you find the best probability density distribution that fits a particular data set? Is there any software that will take a data set and run...

• Replies: 2
• Views: 7,981
03-07-2012, 02:15 PM
36. ### probability with mean and standard deviation

The local hardware store sells screws in 1lb bags. Because the screws aren't identical, the number of screws per bag, although distributed...

• Replies: 4
• Views: 61,268
03-06-2012, 05:20 PM
37. ### Binomial Distribution

I really need help with this homework. I've been on one question for over an hour. The Question is The rates of on-time flights for commercial...

• Replies: 9
• Views: 11,902
03-05-2012, 07:24 PM
38. ### Stat Question - Exponential Distribution

Suppose that 5 components are sequentially connected in a such a way that the whole system works as long as all of them work. Assume that the...

• Replies: 1
• Views: 2,734
03-05-2012, 07:00 PM
39. ### Bayes thoerem, can you check my solution please?

Hi, I'm terrible at statistics, i hope someone can help. A ship sank into the sea and is now laying in a fixed but uknown position on the bottom...

• Replies: 6
• Views: 2,173
03-05-2012, 12:20 PM
40. ### Bias of ratio estimator of pop.mean, DOUBLE POST

I need to explain why the ratio estimator of the population mean is biased or unbiased. I am fairly certain that it is a biased estimator but I don't...

• Replies: 0
• Views: 2,299
03-05-2012, 12:29 AM
41. ### Poisson Distribution

I am confused with my calculator I think! Lol We started the Poisson distribution and I am terrible with writing the formula in this forum so I...

• Replies: 1
• Views: 1,518
03-04-2012, 07:28 PM
42. ### Pascal Random Variable

I've got a test coming up and I'm redoing all of my old homework to make sure I understand everything. I ran across this gem and really have no clue...

• Replies: 0
• Views: 3,873
03-03-2012, 07:56 PM
43. ### Derived Random Variable

Can someone please explain the idea behind this to me? My text says "Assume X is a random variable. Then we can define another r.v. Y = g(X). ...

• Replies: 2
• Views: 3,517
03-03-2012, 07:43 PM
44. ### Function of a RV

X~N(mu,sigma^2) Find pdf of Y=aX^2+bX+c I know that if X is normally distributed then if Y=aX+b, Y~N(a*mu+b, a^2*sigma^2). Is there a similar...

• Replies: 1
• Views: 1,952
03-03-2012, 04:05 PM
45. ### In how many ways can 14 be rolled using 4, 6 sided dice?

Hello, I am stuck in trying to figure out a possible number of permutations in which a certain sum of all dices rolled can be reached. For...

• Replies: 3
• Views: 6,101
03-02-2012, 10:59 PM
46. ### On Correlation Matrices

Hi. This is a question from a question bank. I am self-studying for upcoming MS exam. a)Random vector X, elements are independent and zero mean....

• Replies: 6
• Views: 2,209
03-02-2012, 12:16 AM
47. ### Probability Problem... Coins x Cards and Coins x Dice

Hi, new here. I created this account to just ask this one question (although I will probably ask or answer others for the duration of my AP Stats...

• Replies: 3
• Views: 2,942
03-01-2012, 09:50 PM
48. ### Intelligence vs. Possibility: 10 chicks 10 eggs

Hi all, We have a complicated question. Please make your best effort to answer it :yup: Chick Problem: There are 200 chicks. When they are...

• Replies: 1
• Views: 2,304
03-01-2012, 10:00 AM
49. ### Lottery Draft Question

Hi! I'm trying to figure out the odds of each team getting each pick in our NHL fantasy league lottery draft. It is somewhat modeled after the...

• Replies: 1
• Views: 3,108
BGM
03-01-2012, 02:08 AM
50. ### Probability question:??

If I have 2 coins the first coin is a fair coin and sec one is two head. I randomly pick one and toss it twice, the result are both head for two...

• Replies: 8
• Views: 2,364
02-29-2012, 06:09 PM
51. ### The Mean and Std. Deviation of a probability distribution

Q: Select a bill from a box that contains 3 \$1 bills, 2 \$5 bills, 2 \$10 bills, 3 \$20 bills. a) Construct a probability distribution b) Find the...

• Replies: 4
• Views: 3,306
02-29-2012, 04:53 PM
52. ### To use binomial or not to use binomial?

"For fans who visit the celebrity facebook page, 15% will click the ad on the page. Each click on the ad link will generate a \$0.05 income. For a...

• Replies: 3
• Views: 1,530
BGM
02-29-2012, 05:49 AM
53. ### Two questions: one about bias/MSE and one about confidence intervals

1. Y1, Y2, .... , Yn are a random sample from the Poisson distribution with parameter (mean) lambda > 0. Show that the square root of the sample...

• Replies: 1
• Views: 1,965
BGM
02-29-2012, 05:42 AM
54. ### Probability of a team making the finals

Hi, I am trying to find how to calculate the probability of "x" number of events happening within "y" opportunities. However each opportunity has...

• Replies: 7
• Views: 2,010
02-28-2012, 09:36 PM
55. ### Request for help developing a commercial solution

Firstly, I apologise if I am in the wrong place. In a business context we need to produce a model to help planning tasks. We are a small commercial...

• Replies: 0
• Views: 1,329
02-28-2012, 12:02 PM
56. ### A self study question for extreme probability....Gaming-Cards.

No, this does not have to do with any current games on the market.... I have a unique question for anyone that can explain it to me. I'm a bit of a...

• Replies: 3
• Views: 1,693
02-28-2012, 11:54 AM

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