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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: 30,333
09-30-2005, 09:44 AM
1. ### I need help in finding the probability

Assume that male and female births are equally likely and that the birth of any child does not affect the probability of the gender of any other...

• Replies: 1
• Views: 6,312
09-21-2006, 03:31 PM
2. ### Random Variables

Haven't a clue where to start with this problem: Leona and Fed are friendly competitors in high school. Both are about to take the ACT college...

• Replies: 1
• Views: 6,305
11-26-2008, 12:49 AM
3. ### Poisson process in 3D

I haven't the slightest idea of how to tackle the following problem. Find the probability density for the distance from an event to its nearest...

• Replies: 1
• Views: 6,303
03-15-2013, 03:11 PM
4. ### Combining random variables, squared

Been sitting with this for a while, and hoping wome of you can assist me. I'm given a pdf f(y) = 6y(1-y) for 0<y<1, and I want to calculate the pdf...

• Replies: 2
• Views: 6,295
03-11-2010, 12:45 PM
5. ### Markov Chain Question

Let P be the transition probability matrix of a Markov chain. Argue that if for some positive integer r, P^r has all positive entries, then so does...

• Replies: 2
• Views: 6,290
08-08-2011, 05:25 AM
6. ### cumulative distribution function for error

Hi, I need help regarding the generation of cumulative distribution function (CDF) for distance error. I have a system which calculates...

• Replies: 9
• Views: 6,285
03-04-2011, 12:06 AM
7. ### Gamma/poisson distribution

Suppose that ‘serious’ road accidents happen on a regional road in accordance with a Poisson process with a rate of 2.3 per week. Let T1 be the...

• Replies: 1
• Views: 6,270
BGM
05-25-2010, 08:36 AM
8. ### Drug Reaction Probability

In a clinical test of the drug Viagra, it was found that 4% of those in a placebo group experienced headaches. Assuming that the same 4% rate applies...

• Replies: 6
• Views: 6,262
02-27-2012, 11:15 PM
9. ### random probability

Answer the question, considering an event to be "unusual" if its probability is less than or equal to 0.05. Assume that one student in your class...

• Replies: 0
• Views: 6,261
05-14-2009, 04:56 AM
10. ### Exponential Distribution

I am having trouble with this question. In my notes from class and the texbook i can only find examples/equations for if P(x>k) or P(x<k). Would I...

• Replies: 1
• Views: 6,255
11-15-2009, 10:27 PM
11. ### Consistent Estimator

I'm new here so i'm not sure what is wrong with my tex (i cant get +)so I will write the correct information under my tex lines A balanced one way...

• Replies: 4
• Views: 6,252
alf
11-09-2011, 11:41 AM
12. ### Uniform distribution

First of all i'm sorry for my english:shakehead ! I'm an Italian logistic engineering student, I've some trouble trying to solve this kind of...

• Replies: 6
• Views: 6,251
06-23-2008, 08:24 AM
13. ### Probability Problem

I am stumped on this one a bit. In 2001, the average conventional first mortgage for new single-family homes was \$245,000. Assuming a normal...

• Replies: 3
• Views: 6,243
06-16-2008, 12:50 PM
14. ### Need help with a practice probability question for Exam P!

Here is the question - The length of time, in years, that a person will remember an actuarial statistic is modeled by an exponential distribution...

• Replies: 2
• Views: 6,243
BGM
05-31-2010, 03:19 AM
15. ### Probablity Question

So I need help!!! For a sales promotion, the manufacturer places winning symbols under the caps of 10% of all Pepsi bottles. You buy a six-pack. ...

• Replies: 1
• Views: 6,234
02-12-2008, 01:43 AM
16. ### Can someone explain how to solve this simple problem?

Your favorite team is in the World Series. You have assigned a probability of 63% that they will win the championship. Past records indicate that...

• Replies: 5
• Views: 6,232
10-26-2011, 09:10 PM
17. ### Help needed on probability assignment.

Hi - A test for a disease has been used for many years. Experience with the test indicates that its sensitivity (probability that a person having...

• Replies: 2
• Views: 6,203
12-22-2010, 02:52 PM
18. ### 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: 6,196
03-26-2012, 04:32 PM
19. ### divide 2 chi square distribution

Hi there, Can anyone help me with this?? : If X1~ X^2 distribution with n1 d.f. and X2~X^2 distribution with n2 d.f. then what is...

• Replies: 1
• Views: 6,190
09-24-2008, 10:00 AM
20. ### Independent study help..

Greetings, I am new here and am in the middle of completing a research project for a Business Policy class. I put my Statistics independent class...

• Replies: 3
• Views: 6,184
01-20-2006, 11:38 AM
21. ### counting rule?

20 students have to be split into 5 different labs groups; how many ways can we partition them if the first 3 labs have 3 students, the 4th has 5...

• Replies: 15
• Views: 6,181
09-20-2010, 10:52 AM
22. ### Probability Question

I have been trying to work though this problem and have gotten stuck; I am trying to set up a table to help me calculate the probabilities...

• Replies: 1
• Views: 6,177
09-12-2011, 03:27 PM
23. ### How to calculate if a mean is above chance level

Dear all, I have a problem to compare means from two groups with chance level. The Variable I want to compare against chance level is calculated...

• Replies: 2
• Views: 6,175
11-07-2014, 09:03 AM
24. ### MCQ related Probability

Here's the question: A MCQ has 100 questions. Each with four possible answer of which only one is correct answer. What is the probability that...

• Replies: 1
• Views: 6,167
12-01-2008, 06:34 AM
25. ### 2 Probability problems

I am taking statistics at my local community college and am ONLY doing it because it is required for a BSN degree. I am a 4.0 student, but most of my...

• Replies: 2
• Views: 6,151
06-16-2008, 03:14 PM

When a customer comes to a bank, there are three primary locations they may select to go to:teller, loan officer, or escrow department. Based on...

• Replies: 1
• Views: 6,148
10-09-2005, 05:43 PM
27. ### Jump Discontinuities in CDF's

There aren't any examples of cumulative distribution functions with discontinuities in my textbook. I'm wondering what to do with something like...

• Replies: 4
• Views: 6,148
10-27-2010, 12:33 PM
28. ### Permutation or Combination? Who knows? How to know?

I think I have a decent understanding of the difference btwn permuation and combination. But occasionally a word problem comes up that throws me a...

• Replies: 2
• Views: 6,143
04-18-2006, 04:35 PM
29. ### Help...

I'm not sure how to set up this binomial probability problem. I hope there is a good probability that someone can point me in the right direction. ...

• Replies: 4
• Views: 6,143
10-09-2012, 09:55 PM
30. ### Probability of intersection

Hello, Does anyone know if the probability of intersection of A and B can be BIGGER than the multiplication of the probability of A with the...

• Replies: 1
• Views: 6,136
11-30-2005, 09:13 AM
31. ### Test Score Probability

I’m trying to compare my grade on my Algebra exam to my fellow students using the normal distribution. Here are the results of the exam: ...

• Replies: 1
• Views: 6,136
09-14-2006, 01:00 PM
32. ### 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: 6,132
03-02-2012, 10:59 PM
33. ### Test significance of gene overlap between two gene lists by chance

I am very new to bioinformatics and statistics so trying to ask around for help. I am working with expression data from two different antibody...

• Replies: 3
• Views: 6,130
BGM
05-22-2013, 11:32 AM
34. ### test of significance with Poisson Distribution...

Hello guys, well my problem is the following: I have some data that I have proved that follow the Poisson distribution using chi-squared test. Then...

• Replies: 2
• Views: 6,127
nwg
11-25-2008, 03:46 PM
35. ### Only one of two events occurs

P(A) = 8/15 P(B) = 1/3 P(A|B) = 1/5 (Question) calculate the probability that only one event occurs. i have already calculated that the...

• Replies: 3
• Views: 6,125
04-23-2012, 11:48 AM
36. ### I need help with these problems,

Hey everyone, I am new at this forum. I need help with these problem... I hope you can provide me with full solution and steps please...

• Replies: 1
• Views: 6,122
02-26-2006, 10:34 PM
37. ### Finding the probability, given only the mean

Hello, I am in desperate need for assistance. A tutee of mine had a problem with probability. Here is the question: According to J. D. Powers...

• Replies: 4
• Views: 6,121
06-13-2007, 02:22 PM
38. ### Generate random number using Inverse Transformation Method

Hi, I am looking for guidance on the proof of the Inverse Transformation Method to simulate a random variable having a continuous distribution. ...

• Replies: 2
• Views: 6,116
03-03-2009, 12:01 PM
39. ### normal approximations

One statistic used to assess professional golfers is driving accuracy, the percent of drives that land in the fairway. Driving accuracy for PGA...

• Replies: 4
• Views: 6,116
06-18-2010, 05:05 PM
40. ### Multiplication Theorem on Probability and proof

Hi Everyone! I'm with Conditional Probability and I don't understan this theorem. Theorem: If then Proof:

• Replies: 1
• Views: 6,116
06-22-2013, 11:22 AM
41. ### Probability using z-table

I'm studying for a final and working on some practice problems. I'm stumped on this one and would appreciate any and all help you can provide. The...

• Replies: 4
• Views: 6,101
12-11-2009, 07:42 PM
42. ### kth sample moment

Show that the kth sample moment about the origin, based on a sample of size n, is an unbiased estimate of the kth theoretical moment of a random...

• Replies: 1
• Views: 6,101
11-11-2010, 03:55 AM
43. ### Reliability of a system with parallel components

Hi, Consider this q.: If all 3 components in a parallel system function independently of one another, and the reliability at time t of the ith...

• Replies: 2
• Views: 6,090
11-03-2008, 03:02 AM
44. ### rock paper scissors vs flipping a quarter

hello everybody. thanks for your reply ahead of time. scenario 2 people 1 time only game of rock paper scissors vs flipping a quarter what are...

• Replies: 7
• Views: 6,087
leo
04-09-2008, 08:46 AM
45. ### Mean question

An oil exploration firm is formed with enough capital to finance 30 explorations. The probability of a particular exploration being successful is...

• Replies: 2
• Views: 6,073
06-21-2007, 07:27 AM
46. ### Probability split deck of cards

Hi there, I've been stuck in this problem for some time, id be helpful if someone help me shed some light on it. Say we split a deck of 52 shuffled...

• Replies: 3
• Views: 6,073
BGM
10-25-2010, 05:51 AM
47. ### Joint and Marginal Densities.

I am having some problems grasping the concept of these joint and marginal densities. It would really help if someone could provide me with an answer...

• Replies: 1
• Views: 6,071
BGM
01-30-2011, 02:28 AM
48. ### Expected values of bivariate distribution

Hi guy's, To calculate Eor E of a bivariate pdf fXY(xy) Do you treat them seperately ie to calculate E E= \int x f(x,y)dx or to calculate...

• Replies: 2
• Views: 6,070
05-10-2009, 03:58 PM
49. ### normal distribution, use 50% probablity to get standard deviation

Hello, I have got a normal distribution with μ=0 and I know that 50% of all observations are within a certain range. How can I get the standard...

• Replies: 2
• Views: 6,068
07-19-2011, 11:56 AM
50. ### Sum of 3 independent uniform distributon

Hi, Can someone please help me solve the following problem Y = X1 + X2 + X3 Xi ~ Uniform(0,1) independent i = 1, 2 3 I need to find...

• Replies: 2
• Views: 6,066
BGM
12-30-2011, 12:29 AM
51. ### Video lectures on SDE's

Hi people. Does anyone know of an online lecture series on stochastic processes and/or stochastic differential equations?

• Replies: 1
• Views: 6,057
03-30-2011, 05:55 PM
52. ### Poisson Process

Hello I really need help with this problem and I have to show my work. We went over the Poisson equation but I can't figure out how to plug...

• Replies: 1
• Views: 6,035
BGM
04-28-2010, 12:49 AM
53. ### P value two tail test estimation formula

Hi Thanks in advance for reading my question. For my stats class, we have estimate p value using the charts. And then we compare that outcome to...

• Replies: 0
• Views: 6,022
10-10-2010, 12:44 PM
54. ### creating sten scores

Hi, Please can someone help me out with creating a sten score - I am unsure of the process to follow to do this - is it something that can be...

• Replies: 0
• Views: 6,018
03-20-2006, 12:01 AM
55. ### having a bit of brain freeze with this

Length of metal strips produced by a machine are normally distributed with mean length of 150 cm and a standard deviation of 10 cm. Find the...

• Replies: 2
• Views: 6,018
07-17-2012, 04:19 PM
56. ### m&m probability

Hi can you look over my solution? I am having difficulty in C and D part(what do they mean by procedure?) Thanks :yup: 1) According to company...

• Replies: 1
• Views: 6,017
12-01-2010, 01:23 AM
57. ### Find P(X>1|Y=1), are X and Y independent?

I'm trying to teach myself joint distributions, and there are two questions I'm stuck on. 1.Continuous random variables X and Y have joint pdf...

• Replies: 3
• Views: 6,008
01-23-2009, 12:34 PM
58. ### Dice Probability (2d6, 3d6, 4d6)

I would like to find the probabilities of rolling a result using different numbers of six-sided dice. I am looking for the best way to figure out the...

• Replies: 2
• Views: 6,006
BGM
05-10-2014, 12:50 AM
59. ### Cumulative distribution help.

Okay so I've got this question: Let X be a random variable with a cumulative distribution function Fx. Prove that P(x=a) = 0 if and only if Fx is...

• Replies: 11
• Views: 6,003
10-11-2010, 06:25 PM

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