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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: 30,322
09-30-2005, 09:44 AM
1. ### expected value, uniform distribution

Hi everyone, i have a weird question and here it goes, if x is uniformly distributed within the region (0,1]. How should I find E where...

• Replies: 1
• Views: 4,348
07-11-2010, 11:27 AM
2. ### Help

an auther flips a coin 100 times in order to decide whether to use he or she in his book. If it's heads, he uses he. If it's tails, he uses she. What...

• Replies: 4
• Views: 2,593
07-11-2010, 08:53 AM
3. ### The Minimum of n Independent Normal Distributions

This is a very good article, on the subject of the distribution of the minimum of several random variables, by Joshua Hill: ...

• Replies: 2
• Views: 10,212
07-10-2010, 03:47 AM
4. ### Weird Question

Hello all! I have sort of a weird question / request. I'll be taking Mathematical Statistics I and II come Sept and I really want to brush up...

• Replies: 4
• Views: 3,976
07-08-2010, 09:18 PM
5. ### sample size for a probit analysis

Hi there, I am conducting a hydrocarbon toxicity research using mosquito larvae as target. The idea of this research is to estimate the relative...

• Replies: 0
• Views: 4,524
07-07-2010, 06:08 PM
6. ### Cumulative combinations

I wish to determine the probability of a team winning AT LEAST eight of its next ten games. I understand that 10C8 will tell me the probability of...

• Replies: 5
• Views: 4,563
07-04-2010, 10:12 AM
7. ### Interesting problem

I have a list of 10,000 companies along with their annual revenues. These companies are classified as either small or large (there is a strict...

• Replies: 5
• Views: 3,187
07-02-2010, 10:45 PM
8. ### Help with a probability problem

You have a deck of 60 cards which contains 4 red and 4 blue cards. You draw 7 cards from the deck, what is the probability that you'll have at least...

• Replies: 5
• Views: 2,988
07-02-2010, 12:02 AM
9. ### 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: 4,055
BGM
07-01-2010, 01:28 PM
10. ### Will rounding off Standard Deviation Bins cause error on Histogram?

I am creating a Histogram. I have about 100 points of data and I am using MS Excel's Histogram function to create the "Bins". The data points I have...

• Replies: 4
• Views: 6,730
06-30-2010, 11:34 AM
11. ### Sampling Probability

Hi, Can anyone help with this problem: If i have a given volume (v) that contains a number of discrete particles (p) randomly distributed...

• Replies: 10
• Views: 7,689
06-29-2010, 07:29 AM
12. ### 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: 4,467
06-29-2010, 12:59 AM
13. ### A probability question

52 cards, 13 values (A to K) and 4 suits. what's the probability of getting 5 cards with a four-of-a-kind (same value)? My solution: first card...

• Replies: 4
• Views: 2,670
BGM
06-28-2010, 01:25 PM
14. ### Distribution function question please.

Hi guys, I have this problem: "The degree of efficiency of the solar cells produced by the company PhotoEnergy is distributed according to...

• Replies: 1
• Views: 2,588
06-27-2010, 07:12 PM
15. ### Probability of Selection of committee officers

I have tried several ways to do this problem, but I am stumped!! My original answer which was wrong was 4 nPr 4/12 nCr 4 = 24/11880 = There is a...

• Replies: 3
• Views: 5,142
06-27-2010, 02:58 PM
16. ### probability one

Can someone help? The average number of pounds of meat a person consumes a year is 212.3 pounds. Assume that the standard deviation is 20 pounds....

• Replies: 1
• Views: 3,379
06-26-2010, 11:27 PM
17. ### F-Test Help

I'm doing an F-test, something I don't think I've ever done before, and I'm a bit confused because I'm seeing different things. The problem asks...

• Replies: 1
• Views: 2,372
06-26-2010, 07:08 PM
18. ### Proportion question

Can someone please help, I don't know why but this question is giving me trouble-I am having a mental block. Thanks. The distance that one...

• Replies: 1
• Views: 4,221
06-26-2010, 01:28 PM
19. ### Bivariate Normal distribution

I want to get the characteristic function of the bivariate normal distribution when both means =0 and variances =1 . I can't do the integration. In...

• Replies: 0
• Views: 2,498
Emy
06-26-2010, 04:09 AM
20. ### Pick 3 items, probability that A<B<C

This question has been bugging me the last 24 hours or so, hopefully someone here can break it down for me. Say you have N number of items that...

• Replies: 3
• Views: 5,592
06-25-2010, 03:52 PM
21. ### Binary Logistic Regression Event Prob - Minitab

Good Day To All, I am new to the site and could use a little clarification regarding the following: In Minitab, I have conducted a Step-Wise...

• Replies: 1
• Views: 4,208
06-25-2010, 03:00 PM
22. ### Probability for t=.0419, two independent samples, sample size 10?

Using a student's t-Test, I've found a t-Statistic of .0419 for two independent samples of 10. My problem is getting the corresponding p-Value....

• Replies: 4
• Views: 3,030
06-25-2010, 11:55 AM
23. ### comparing two Poissonians

What is the proper statistical test for the following: I know A1 and A2 to be Poisson distributed with (unknown) means x1 and x2. I have a single...

• Replies: 20
• Views: 5,893
06-23-2010, 12:36 PM
24. ### 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: 4,098
06-21-2010, 11:55 PM
25. ### Minor question on sample sizes

Pardon the double-posting -- I'm not sure what this forum's culture is on creating new threads for new topics, but I tend to try to keep each topic...

• Replies: 5
• Views: 2,571
06-21-2010, 10:33 PM
26. ### a little probability question

An elevator goes from the ground floor up to the 8th floor (8 floors in total). In the elevator 10 people. Each one of them choose randomly and...

• Replies: 2
• Views: 2,412
06-21-2010, 05:24 PM
27. ### poisson

a little help with this one will also be appreciated ! The number of bugs in a computer is a Poisson random variable with a rate parameter of 3...

• Replies: 1
• Views: 2,700
06-21-2010, 10:57 AM

thanks much for all ur help!!

• Replies: 4
• Views: 2,657
06-19-2010, 12:55 AM
29. ### 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: 6,109
06-18-2010, 05:05 PM
30. ### A question on Poisson distribution

Hi, Let X1 and X2 be Poisson distributed variables with the same mean m and Y be defined as multiplication of X1 and X2 (Y=X1X2). How can i obtain...

• Replies: 2
• Views: 4,163
BGM
06-18-2010, 12:11 PM
31. ### very short question variance iid

Let x1, x2,...xn iid random variables. Suppose that it is given that Var(Sum(x(i)))=S, can I claim that var(x(i))=S/n ? I guess that the...

• Replies: 2
• Views: 2,938
06-17-2010, 05:01 PM
32. ### central limit theorem basic question

I have a basic question concerning the central limit theorem let the 2 by one vectors x1, x2, ..., xn come from a population with mean μ=' , and...

• Replies: 1
• Views: 2,796
BGM
06-17-2010, 02:47 PM
33. ### Help on comparing mean to distribution values

Hi all, I'm new here -- I'm tutoring a student in Probability/Statistics, and I've come across a type of problem that I can't recall how to solve....

• Replies: 7
• Views: 3,774
06-17-2010, 11:55 AM
34. ### Estimate Probabilites

Hi All, I am interested in replicating in-game win probabilities for the NBA. There are a number of sites on the web that do this; sometimes it...

• Replies: 2
• Views: 2,631
06-15-2010, 07:30 PM
35. ### Permutation probability

Hi all, I am trying to find the probability of the permutation of correlated random variables. The problem is: Let X_i be correlated normal...

• Replies: 2
• Views: 2,449
06-15-2010, 06:49 AM
36. ### discrepancy between summed binomial probability and expected value

Hi all. Im writing a program to calculate statistics for a tabletop game, and I'm confused by a discrepancy between a calculated expected value...

• Replies: 1
• Views: 2,730
BGM
06-11-2010, 12:35 PM
37. ### Expected number of times until x occurs

Hello all, I am just writing to see if this is right. There are two things that can occur. With a probability 1/a, event y occurs and you get a...

• Replies: 5
• Views: 5,484
BGM
06-10-2010, 10:30 PM
38. ### Figure out if there is any statistical significance

Hi - I have some data on the internal temperature of cooked meat. The meat patty is a failure if the temperature obtained is below a certain...

• Replies: 8
• Views: 11,649
06-10-2010, 01:27 PM
39. ### Help Needed for Joint Distributions

I'm fuzzy about the idea of joint distributions and would appreciate it if someone can please help me understand the concepts more clearly. My...

• Replies: 3
• Views: 3,267
BGM
06-10-2010, 10:02 AM
40. ### Simple probablility question

A closet contains 8 pairs of shoes. If 4 shoes are randomly selected, what is the probability that there will be no complete pair? So i know that...

• Replies: 8
• Views: 8,064
06-08-2010, 05:53 PM
41. ### Std. Dev as Response in Factorial Randomized Experiment

Greetings, I am working with data generated from a 4 factor randomized experiment. Material is produced from the experimental process and is...

• Replies: 0
• Views: 2,702
06-08-2010, 12:35 PM
42. ### Relation between n, p, q, and sigma

I know the value of n and p. I am looking for the standard deviation and mean based on those values. I gather that the forumla for sigma, the...

• Replies: 1
• Views: 12,675
06-07-2010, 04:52 PM
43. ### Intersect of a compliment

If E is .4 and F is .6 and E and F intersect at .1 where do the compliment of E and F intersect?

• Replies: 2
• Views: 3,106
06-05-2010, 10:50 AM
44. ### Need Help!!

Hi I have one question on probability that I am stuck on. The question is: Suppose we have a normal distribution with mean of 10 and standard...

• Replies: 1
• Views: 2,412
BGM
06-05-2010, 09:49 AM
45. ### household selection probabilities for household surveys

Hi, we are starting a survey with 2 stage cluster sampling approach. At first stage we select a fixed number of clusters from total population...

• Replies: 0
• Views: 3,602
06-04-2010, 01:07 AM
46. ### Looking for a method

Hello, I have a statistical problem im trying to analyze, but i have no clue on what method to use. So what im looking for, at least initially, is...

• Replies: 0
• Views: 2,158
06-03-2010, 02:03 AM
47. ### Bingo probability question

Hello all, I have visited the wizzard of odds to get some answers on bingo probabilities but I have a new version that isn't included on that...

• Replies: 0
• Views: 3,385
06-02-2010, 03:53 AM
48. ### dog sniff probability problem

I am an attorney looking for some help on making sure I have my math correct for a false positive/false negative test. Assume: 10 out of 100 cars...

• Replies: 3
• Views: 3,238
06-01-2010, 07:29 PM
49. ### Probability question

I read this as a solution to a problem, but I'm not sure how to get it: Say we have k balls, of which 1 is red and k-1 are black, and k is odd. ...

• Replies: 2
• Views: 3,212
06-01-2010, 05:56 PM
50. ### Difficult Integral standard normal pdf/cdf

I would like to get an explicit analytical form for the integral (below)...or something close to it with an associated (small) error term. (Note that...

• Replies: 17
• Views: 13,939
BGM
05-31-2010, 09:35 AM
51. ### 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: 6,234
BGM
05-31-2010, 03:19 AM
52. ### When dickey fuller test returns t statistics > 0

When I ran the dickey fuller test on a variable, the test indicates that the t statistics is greater than zero and is greater than the absolute value...

• Replies: 0
• Views: 3,474
05-29-2010, 10:16 PM
53. ### A very simple question, I think.

Hi. I have what I think will be an easy question. Apologies if it's too trivial or if this is the wrong forum, I've never done stats, and really only...

• Replies: 3
• Views: 3,187
05-29-2010, 04:04 PM
54. ### Reinforced Probability

Hello All, I have been trying for ages to solve this, so any advice no matter how minimal would be greatly appreciated. Suppose there is some...

• Replies: 7
• Views: 2,576
05-28-2010, 11:02 AM
55. ### RPI Question / Alternative

I run a competitive videogame website and am in the process of researching ways to rank teams competing in our quarterly league seasons. Briefly, I...

• Replies: 3
• Views: 2,805
05-27-2010, 11:35 PM
56. ### Calculating the expected value

Hi, I have a strange problem. Following info is provided: Event insurance comp. allows promoters of any event to protect themselves from financial...

• Replies: 1
• Views: 3,481
BGM
05-26-2010, 01:57 PM
57. ### gamma moments integral short question

Hi there, About the moment generating function of the gamma distr. f(x)=λ^α/(Γ(α))x^(α-1)exp(-λx). is the pdf. ...

• Replies: 3
• Views: 3,256
BGM
05-26-2010, 04:46 AM

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