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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: 30,357
09-30-2005, 09:44 AM
1. ### Football Betting Method

Say I have 3 betting methods on football games. Each system is able to predict the winner with 60% accuracy. Method1: 60% Method2: 60% Method3:...

• Replies: 1
• Views: 4,169
DAV
10-04-2008, 05:00 PM
2. ### How can I determine the accuracy of some predictions?

How can I determine the accuracy of some predictions? Take the example of weather forecasts. Each day weather.com has a predicted probability it will...

• Replies: 2
• Views: 4,165
05-18-2010, 11:47 AM
3. ### probalility question

The duration of Alzheirmer's disease from the onset of symptoms until death rangers from 3 to 20 years. The average is 8 years with a population...

• Replies: 1
• Views: 4,162
12-06-2008, 11:03 PM
4. ### Proof question

Using the identity: (^θ -θ) = + = + B(^θ) , Show that

• Replies: 1
• Views: 4,162
07-20-2011, 05:39 PM
5. ### 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: 4,162
03-10-2012, 06:57 PM
6. ### Question regarding Z Scale - Is my answer correct?

Here is the question. A company markets salmon in cans. It claims that the net mean weight of the cans is 8 and the standard deviation is .04. ...

• Replies: 2
• Views: 4,161
10-12-2010, 09:41 AM
7. ### Finding the Probability

Hi I just have a quick question, and just want to know if I did the question right :) A organization contains 2 events, E and T. The organization...

• Replies: 1
• Views: 4,157
04-02-2010, 02:09 PM
8. ### Order statistics, sample median

Hi! Can you help me with this: we have X=(X1, X2, ... Xn) - iid, Xi ~ N(m,1), I need to prove that distribution of med(X)-X(j) is the same as...

• Replies: 4
• Views: 4,156
04-08-2012, 04:59 PM
9. ### Assesing normality - Amateur question

Hi everybody, (First of all, excuse my poor english : It's not my native tong). I'm working for myself on a computer programm which will deal...

• Replies: 4
• Views: 4,154
01-21-2008, 11:11 AM
10. ### normal distribution problem

I'm in intro. stats. Help please. Question is: Test scores normally distributed with mean=68.2 and standard deviation=10.4. Estimate probability...

• Replies: 0
• Views: 4,153
03-22-2008, 03:18 PM
11. ### Expectation of iid variables

Hello I hope to get some help with this one. Let X_1,X_2 be iid random variables, both concentrated on I\subset\mathbb{R}_+. Define ...

• Replies: 7
• Views: 4,151
BGM
12-17-2012, 12:18 PM
12. ### overlap integrals for empirical data

Hi, I have two sets of data each originating from a different probability density function for a continuous stochastic variable (I do not know how...

• Replies: 2
• Views: 4,150
04-13-2010, 08:13 PM
13. ### Layperson with a question

Hello! A friend of mine recently asked me for help with this, and while we kicked around a few ideas, we weren't really satisfied. That, and the fact...

• Replies: 18
• Views: 4,146
08-06-2015, 09:10 PM
14. ### Mutual information of two vectors

As with another poster on this section, I understand the ideas behind mutual information but am having trouble with finding information necessary for...

• Replies: 0
• Views: 4,144
01-02-2008, 09:11 AM
15. ### Discrete random variable

Here is a problem given : Let X equal the number of flips of a fair coin that are required to observe heads-tails on consecutive flips. Need to...

• Replies: 1
• Views: 4,144
10-23-2008, 10:27 AM
16. ### Total Probability with Multiple Events

I assume this is a simple question to answer, but it has been a long time since running through probability questions. I am basically looking for...

• Replies: 1
• Views: 4,141
07-07-2009, 08:33 PM
17. ### 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: 4,139
05-29-2008, 07:40 AM
18. ### Student's t-Test -- just looking for confirmation

For this particular t-Test, I'm comparing a sample with 16 values, mean 5.34, stdev .28 to a population whose mean is 5.27, stdev .08. I'm certain...

• Replies: 2
• Views: 4,137
06-21-2010, 11:55 PM
19. ### Probability of getting your umbrella back

This problem took me a while to figure out. Thought I'd post it up to see if other members would get it quicker than I did. A party has n guests,...

• Replies: 1
• Views: 4,137
12-09-2010, 12:08 PM
20. ### Gelman Hierarchical Bayesian Beta Binomial model

Hi folks: Am new to the board and hoping to post something that might be useful to someone. I'm currently trying to learn Bayesian modeling on my...

• Replies: 1
• Views: 4,132
03-18-2009, 03:52 PM
21. ### Probability

Question: Melissa must finish two courses, statistics and economics, in order to complete requirements for a degree. All along she has mainttaned an...

• Replies: 2
• Views: 4,130
09-07-2005, 01:21 PM
22. ### Probablity of the ceiling falling?

My friend asked me a question. "What is the probability of this ceiling falling?" I was puzzled. Then he replied that the probability is 1/2. Here is...

• Replies: 9
• Views: 4,130
09-22-2007, 08:56 AM
23. ### About convergence of a monotonic sequence

If {X_n} is a monotonically increasing sequence, such that X_1 <= X_2 <= X_3 <= ... and there's some subsequence of {X_nk} of {X_n} such that ...

• Replies: 0
• Views: 4,127
10-03-2010, 03:26 AM
24. ### density function

hi, i'm working on a problem that goes like: A fire-detection device uses two temperature-sensitive cells (cell A and cell B) acting independent...

• Replies: 3
• Views: 4,122
06-04-2009, 03:25 AM

A study undertaken by the Miami-Dade Supervisor of Elections in 2002 revealed that 44% of registered voters are Democrats, 37% are Republicans, and...

• Replies: 2
• Views: 4,122
09-26-2014, 04:20 AM
26. ### Probability that a set of numbers is non-random?

Hello, I'm wondering if anyone knows the answer to this: For a set of X numbers with a median of Y and a standard deviation of Z, where a set...

• Replies: 1
• Views: 4,117
01-16-2011, 07:21 AM
27. ### Continuous Random Variance

Assume that x is a binomial random variable with n=1000 and p=0.5 Find the following probabilities: P(x >500) So mu=np=1000x0.5= 500 ...

• Replies: 1
• Views: 4,116
10-19-2008, 01:02 PM
28. ### Probability of simply "guessing" in a Blind Triangle taste test

Hi, I am a new member to these forums and I have a problem that’s been bugging me. A huge thank you for any help with this one. It’s an odd one. I...

• Replies: 3
• Views: 4,116
03-27-2013, 10:19 AM
29. ### Challenging Probability Question

An analyst is presented with lists of four stocks and five bonds. He is asked to predict, in order, the two stocks that will yield the highest return...

• Replies: 2
• Views: 4,113
03-03-2006, 01:37 AM
30. ### 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: 4,111
07-13-2010, 09:26 PM

An oil drilling company ventures into various locations, and their success or failure is independent from one location to another. Suppose that the...

• Replies: 6
• Views: 4,106
08-12-2009, 07:44 AM
32. ### Genetics Probability Question

There is a genetic completely recessive trait. Neither mother or father display the trait but they may be heterozygous carriers. The...

• Replies: 1
• Views: 4,105
09-21-2010, 04:17 PM
33. ### Corrected significance level in Tukey HSD post-hocs?

Dear all, I have a question that is really bugging me: I'm testing if seed set in one plant species is impacted by the deposition of pollen...

• Replies: 1
• Views: 4,104
10-28-2007, 06:31 PM
34. ### cost estimating with probability

i'm trying to do a quick cost estimation using this monte carlo program to see how it works but i'm also trying to factor in different types of risk...

• Replies: 0
• Views: 4,101
08-19-2008, 05:14 PM
35. ### I have a probability question!

help please.. I don't know how to find P(x) The BREAKOUT OF FACULTY MEMBERS FROM THE MS&E Divison Suppose that three faculty members are chosen...

• Replies: 12
• Views: 4,101
03-17-2013, 11:07 AM
36. ### Probability?

Find the total number of outcomes when choosing the last three digits in a five-digit zip code if the first digit is 6 and the second digit is 1,...

• Replies: 1
• Views: 4,100
08-31-2005, 10:40 PM
37. ### Need help random variables

Question 1) A hung jury is one that is unable to reach a unanimous decision. Suppose that a pool of 25 potential jurors are assigned to a murder case...

• Replies: 2
• Views: 4,099
06-19-2007, 06:10 PM
38. ### Statistics question help! Stuck!

I have a question regarding statiscs. Here is some information: A case of 600 past negligence cases showed 80% of the plantiffs were awarded...

• Replies: 0
• Views: 4,096
11-08-2007, 05:58 PM
39. ### Probability Distribution

The time (in hours) it takes before belts X and Y need replacing in a high use machine follows the joint probability distribution: integral y/100*...

• Replies: 8
• Views: 4,094
BGM
09-22-2010, 01:01 PM
40. ### Bivariate Normal + Max Transformation

Hi guys, This exercise is driving me crazy. That is: (X,Y) follows a normal bivariate distribution E = E = 0 E = E = 1 E = r I have to...

• Replies: 3
• Views: 4,093
02-02-2011, 05:25 PM
41. ### Some questions on Hypothesis, poissson and normal dist...try it

Question 1 Millions of suburban commuters are finding railroads to be a convenient, time-saving, less stressful alternative to the automobile. While...

• Replies: 4
• Views: 4,091
03-03-2008, 01:53 PM
42. ### Limiting Distribution question

Let X1,......,Xn ~ Uniform (0,1). Let Yn = X bar n ^2. Find the limiting distribution of Yn. We know that whenever a random variable has a...

• Replies: 2
• Views: 4,089
10-11-2016, 03:38 PM
43. ### 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: 4,088
07-14-2010, 12:26 PM
44. ### Moment generating function

I have a random variable V with density function: f(v) = (2/3)v, for 1<=v<=2 what is the moment generating function? My answer came out to...

• Replies: 2
• Views: 4,088
12-06-2010, 03:21 PM
45. ### Ratio of two Cauchy random variables.

Hello. I'm trying to find the probability density function (pdf) of the random variable U = X/Y where X and Y are both iid Cauchy random...

• Replies: 2
• Views: 4,087
07-09-2012, 02:29 PM
46. ### Probability of complements.. is it that simple?

P(A) = 1/4 P(B) = 2/3 P(A|B) = 1/4 Question: What is P(A^c|B^c) ? I don't think it's just 1 - 1/4 = 3/4 ... Would it be P(A^c) * P(B^c) =...

• Replies: 2
• Views: 4,082
02-14-2011, 01:19 AM
47. ### difference of two independent Poisson random variables

Why the difference of two independent Poisson random variables doesn't have Poisson distribution? Demonstrate it.

• Replies: 6
• Views: 4,082
02-13-2015, 11:50 AM
48. ### Probability Distribution

I have no clue. I need help solving this problem: About 71% of the student generally pass the psych. class. This semester 88 students took the...

• Replies: 2
• Views: 4,080
12-11-2007, 04:39 PM
49. ### Lottery combinations?

Someones invented a bet and put it on beluckytote.com. I'm thinking of putting 20p on it but I'm not sure what the odds for the different options...

• Replies: 3
• Views: 4,080
sid
12-17-2009, 05:18 PM
50. ### 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: 4,080
07-16-2010, 12:08 PM
51. ### 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: 4,077
05-19-2006, 12:21 PM
52. ### Random walk and Central limit theorem

(Random Walk) A stock has the value of 100 on day 0. Each day, the value changes randomly either one unit upwards with probability 2/3 or two units...

• Replies: 2
• Views: 4,077
02-08-2010, 06:30 AM
53. ### Mean and var of maximum of n RVs from uniform dist.

I am doing a problem that focuses on the maximum of n iid discrete RVs (Ymax) of Y1,...,Yn, each having the same probability distribution with common...

• Replies: 2
• Views: 4,076
01-29-2012, 03:44 PM
54. ### Probability Distribution question

Homework question involving number of defects found in a randomly selected factory item. if X is the number of defects found, and the probability...

• Replies: 1
• Views: 4,070
02-22-2010, 01:32 PM
55. ### Binominal vs Geometric.....confused!!!!

Hi there, I am currently working on these questions but I don't really get how to work them out. Is it wrong to use the binomial distribution for a)...

• Replies: 0
• Views: 4,070
10-23-2011, 01:13 PM
56. ### Probability that one random variable is greater than another

I need to find the probability that a normally-distributed random variable is greater than a uniformly-distributed random variable. That is: X...

• Replies: 2
• Views: 4,070
b_d
07-20-2012, 12:52 PM
57. ### Probablilty binomial distribution

Keeping in mind that this is an excerpt from a novel, let us examine the probability, 0.7980, of a successful jump. If you were one of the l2-member...

• Replies: 7
• Views: 4,068
02-01-2010, 03:40 PM
58. ### Basic Probability

6 Boys and 6 Girls sit in a row at random. Find the probability that the boys and girls sit alternately. Please help me with steps to calculate in...

• Replies: 9
• Views: 4,068
10-29-2010, 03:58 PM
59. ### Probability that 53% of College Students graduate in 5 years or less

Good Afternoon, I am working on a problem and got stuck. The problem is below: It is estimated that approximatly 53% of College Students graduate...

• Replies: 2
• Views: 4,067
08-05-2008, 06:46 PM
60. ### Help on Expected Value

Thanks everyone! Now I understand it, the keyword is independent! :) My Answer: If I understand it right, since there are 3 dice, the...

• Replies: 2
• Views: 4,066
BGM
07-01-2010, 01:28 PM

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