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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. ### An event and its complement

My wife was overdue clearing customs so I thought the probability of her showing up any minute was increasing. But then I thought, suppose -there...

• Replies: 6
• Views: 1,846
10-28-2014, 03:22 PM
2. ### an interesting Bayesian stat question

Suppose a random sample of size n is from uniform distribution U(0, exp(gamma)), suppose the prior distribution of gamma is N(a, b), how to find the...

• Replies: 1
• Views: 1,964
05-02-2007, 11:21 AM
3. ### An Unusual Probability Question

Hello everyone, I wonder if anyone would be willing to help me in deciding whether an unusual array of numbers I've found within the NIV Bible is...

• Replies: 0
• Views: 2,954
07-24-2008, 09:44 AM
4. ### Analysis of Squash Match

I've been stuck on this problem for days. Any help, solutions or just pointers would be very welcome. A squash match is composed of a number of...

• Replies: 0
• Views: 1,779
pvm
06-25-2015, 07:32 AM
5. ### Analytic form for the quadrant probability of a (standard) bivariate t distribution?

hellows! i may need this further along my manuscript and quick google searches aren't really being helpful, so maybe someone around here knows. ...

• Replies: 4
• Views: 2,204
BGM
03-01-2016, 11:01 PM
6. ### Analyzing a difference in conditional probabilities

Hi all, I would like to compare the conditional probabilities of an animal behaving in a certain way at two different treatment types. Say the...

• Replies: 4
• Views: 2,650
08-14-2008, 12:33 PM
7. ### Analyzing a sample list of numbers (median, quartiles, box plot)

If you have a sample of 36 numbers (and some of these numbers are repeated more than once), how do you find the median, upper quartile, and lower...

• Replies: 2
• Views: 1,903
10-24-2012, 02:52 PM
8. ### Analyzing averages with different number of trials

Hi everyone, I am having trouble with figuring out the workings of the following problem: If you have two drivers A and B. Driver A wins 100...

• Replies: 1
• Views: 2,283
08-29-2006, 01:24 PM
9. ### Analyzing test results- Normal Distribution

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: 0
• Views: 5,739
06-20-2006, 10:02 AM
10. ### analyzing the PDF or the CDF ??

Hi, I'm recently grappling with the following problem: For my thesis i had to fit my data with two theoretical distribution (gamma and...

• Replies: 0
• Views: 2,364
08-27-2009, 07:22 AM
11. ### Anderson-Darling test appropriate?

Hi, I have a large (>2500) number of z-scores and I want to test if the distribution of these deviates from a unit normal distribution. I have...

• Replies: 6
• Views: 11,856
10-17-2010, 10:04 PM
12. ### another baseball question

Player will bat 4 times in this game. He is expected to get a single .15 of the time he goes to bat for 1 total base, he will get a double .05 a...

• Replies: 0
• Views: 1,907
08-22-2011, 04:27 PM
13. ### Another binomial problem....tell me if I'm heading in the right direction

38% of people in the US have type A+ blood. If you randomly select 5 Americans & ask them their blood type, what is the probability that exactly 3...

• Replies: 3
• Views: 2,154
06-17-2009, 11:54 AM
14. ### Another Die question

If one was to roll a fair day and if the outcome is 2 then select a number at random in and other wise select a number at random in . if the number...

• Replies: 10
• Views: 2,067
11-27-2013, 08:37 AM
15. ### Another difficult Gaussian integral

Hello all, This time, I'm trying to compute \int^{\infty}_{-\infty} \frac{1}{c} \Phi\left(\frac{x}{a}\right)\phi\left(\frac{x-b}{c}\right) dx ...

• Replies: 3
• Views: 4,297
BGM
04-07-2011, 11:28 AM
16. ### Another game designer dice question...

Firstly I want to introduce myself. My name is Daniel and I am a game designer (http://www.hazardgaming.com) when I'm not teaching mathematics. I can...

• Replies: 9
• Views: 2,756
04-09-2016, 09:53 AM
17. ### Another joint density problem

it seems that i cant understand the boundaries... the joint density function: f(u,v)= a , u^2 <= v <= 1 0 , else find a i...

• Replies: 2
• Views: 1,380
06-20-2012, 04:21 AM
18. ### Another martingale question

I have another martingale question. Let {X_n; n>=0} be a martingale with respect to {Y_n}. Prove for any set of integers k<=l<m that the...

• Replies: 2
• Views: 2,057
04-02-2012, 10:10 AM
19. ### Another Negative Binomial ?

I am afraid I have another one from the same kind... 20% of the forms being submitted in a government office contain a mistake in them. Someone...

• Replies: 0
• Views: 1,955
01-16-2011, 10:59 AM
20. ### Another one!

I think this is correct. I would appreciate any input. Question: The potential buyer of a particular engine requires that the engine start...

• Replies: 2
• Views: 3,050
08-17-2009, 10:17 AM
21. ### another probability

this question has three parts and once again I was able to answer part A and B by drawing the tree diagram but I cant seem to figure out part C ...

• Replies: 2
• Views: 2,660
05-25-2006, 09:05 PM
22. ### 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: 2,034
03-07-2012, 03:33 PM
23. ### another Probabilty distribution :)

Hi, okay here is another probabitly question that I was having trouble with. Q1: A company services home air conditioners. It is knwon that time...

• Replies: 0
• Views: 4,717
06-01-2006, 08:46 PM
24. ### another problem :(

Below are the distributions of blood types in the US and China: Blood type A B AB O US probability .1 .2 .3 .4 China prob. .2 .2 .2 .4 Choose an...

• Replies: 1
• Views: 1,987
10-12-2009, 03:55 AM
25. ### Another problem for maximizing profit...

Consider a store owner who buys items one day for $1.00 and sells them the same day for$1.50. Assume the item has no value the next day and that...

• Replies: 0
• Views: 2,701
10-15-2008, 04:55 PM
26. ### Another question

To ascertain the effectiveness of the advertising campaign for the Red Cross Annual Appeal on donations, a telephone survey of 309 Brisbane residents...

• Replies: 3
• Views: 2,214
BGM
09-03-2010, 07:34 AM
27. ### another question....

In order for a device to work properly, part A should work, AND, at least one of parts B,D and F (see diagram). All parts are independent, and the...

• Replies: 10
• Views: 2,723
BGM
06-24-2011, 08:01 AM
28. ### another stats

an experiment consists of choosing a point (x,y) at random from the interior of the circle disk x^2+y^2= 4 a/ find P(X>or = 1/2) b/ find the...

• Replies: 0
• Views: 1,698
09-22-2011, 04:33 PM
29. ### another transformation

Let X be a continuous random variable with p.d.f. f (x) = k(1 − x^2 ), |x| ≤ 1 0,otherwise Show that k = 3/4. I'm not sure...

• Replies: 2
• Views: 2,895
11-05-2008, 04:19 PM
30. ### Answer to Simple Prob Assignment

This problem concerns MGB Problem 1 of Chapter 1: "One urn contains one black ball and one gold ball. A second urn contains one white and one gold...

• Replies: 3
• Views: 2,560
BGM
12-05-2012, 07:27 AM
31. ### any body help me please !!! tomorrow i ave exam but now I don't understand

any body help me Two stocks, A and B, are known to be related. The probability that stock A will go up tomorrow is 0.20 and the probability that...

• Replies: 0
• Views: 2,889
10-28-2007, 08:09 AM
32. ### any help?

Okay, so I have a problem that I'm experiencing difficulty with and I'm curious if anyone can help me set up the equation for this problem: The...

• Replies: 3
• Views: 2,045
06-09-2008, 08:46 PM
33. ### Any suggestions on how to figure out these two problems????

Im getting frustrated because....I have been looking through my textbooks and notes trying to figure out how to set these two problems up...Can...

• Replies: 1
• Views: 4,659
02-19-2012, 05:47 PM
34. ### Anyone can help me?

I have a question asking about how to calculate the probability when the number of outcomes is not finite. Two points L and M are placed...

• Replies: 0
• Views: 1,784
09-27-2006, 06:29 AM
35. ### Apartment vacancy question

My friend is in this exact situation and we are having trouble figuring out the probability - please help! She is looking for a top-floor...

• Replies: 2
• Views: 1,288
12-19-2013, 05:52 PM
36. ### Apparent contradiction with the definition of probability

Hi everyone, here is my doubt: according to the definition of probability the probability that in a coin tossing the result be heads is 0.5 because...

• Replies: 1
• Views: 1,614
03-05-2014, 05:58 PM
37. ### Application of binomial distribution

Hello all, this is my first post. I am a practicing engineer facing a dilemma. Our resident statistician is out for the MONTH, and I have a deadline...

• Replies: 0
• Views: 2,191
05-16-2014, 08:53 AM
38. ### Application of conditional probability with three variables

I have a question concerning the following problem: A hunter has a double-barrelled shotgun. The probability that at least one shot hits the...

• Replies: 0
• Views: 2,158
05-09-2014, 04:45 PM
39. ### Application of Probability in Maintenance

Good Day to everyone Can anyone please help me, i'm a maintenance personnel (machines or engines). We had a machine it could have two (2)...

• Replies: 2
• Views: 1,559
08-25-2013, 07:38 AM
40. ### Application of the unconscious statistician

A random variable Y is normal with mean u and variance s^2. Given that g(y) =exp(2y) , using a taylor series expansion around u to approximate E and...

• Replies: 1
• Views: 1,783
02-08-2014, 10:18 PM
41. ### Appropriate Hypothesis

A company with a large fleet of cars hopes to keep gasoline costs down, and sets a goal of attaining a fleet average of at least 26 miles per gallon....

• Replies: 2
• Views: 8,190
06-07-2011, 10:26 PM

Hi all, the definition of the chi-quadrat distribution is \chi^2_n \sim Z_1^2 + \dots + Z_n^2 with Z_i \sim N(0,1) My question: Are...

• Replies: 6
• Views: 1,988
BGM
04-10-2012, 01:13 AM
43. ### Approximately normal distribution

I am trying to figure out how to calculate QU and QL (Quarter 3 and Quarter 4). On some problems, the book tells me what Q3 and Q4 is, and on...

• Replies: 1
• Views: 3,060
10-20-2006, 08:40 AM
44. ### approximating a density by using a mixture density

Is there any journal article discussing approximating a density by having a mixture density? Or even an exact conversion? I plotted a mixture...

• Replies: 1
• Views: 1,164
07-08-2012, 02:57 PM
45. ### approximating binomial distribution w/ normal distribution

Hi all, I'm stuck on the following problem: The percentage of fat in the bodies of American men is an approximately normal random variable with...

• Replies: 2
• Views: 11,997
06-25-2008, 06:45 PM
46. ### 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: 4,042
08-01-2010, 11:18 PM
47. ### Approximation to Normal Distribution

here's a question i'm working on: The times of the finishers in a local 10 km run are normally distributed with mean 61 minutes and variance 81...

• Replies: 2
• Views: 3,034
07-07-2009, 12:54 PM
48. ### Aproximate inference about a population/distribution

Hello, I am sorry for how confusing this will be. I was reading a while back about making a determination about the probability of a variable in a...

• Replies: 3
• Views: 1,443
10-01-2012, 03:41 PM
49. ### Are (sample) correlation matrices covariance matrices?

All my life I had been under the impression that the correlation matrix was a type of covariance matrix. They share similar features: they are...

• Replies: 2
• Views: 1,341
05-07-2013, 03:21 PM
50. ### Are distributions the "same" in their extreme values?

Hello, I have two independent datasets which are measurements of the height of ocean waves. I would like to tell if these datasets have the same...

• Replies: 3
• Views: 3,647
01-29-2009, 02:23 PM
51. ### are mixture of Gaussian distributions still elliptical distributions?

basically what the title of the thread says, lol. most of my google searches point towards a 'yes' (which is good) but i just wanted to run it...

• Replies: 10
• Views: 2,320
07-01-2013, 03:07 PM
52. ### Are the following events independent or dependent?

I asked the following question in an exam. I can argue both ways, but I am very interested in any further thoughts. ---------------- Are the...

• Replies: 2
• Views: 2,077
02-18-2016, 11:54 AM
53. ### Area Probability comparison

It's been a while since I have studied statistics, but it seems I need it for my work. I have found and area of intersection between two others...

• Replies: 2
• Views: 1,490
09-06-2013, 04:49 AM
54. ### area under curve normal distribution

Two issues, that I am confused about after reading statistics books. Example: weight of an adult is normally distributed with mean of 180 lbs...

• Replies: 3
• Views: 1,935
12-08-2012, 04:35 PM
55. ### Area under PDF for Normal, beta, gamma, and weibull distribution

Dear Stata user/Professional! I have a problem of integral function estimation for the Normal, Beta, Gamma, and Weibull density function in stata. ...

• Replies: 0
• Views: 3,752
08-30-2012, 12:24 AM
56. ### Area under the sampling distribution curve

Hi, Given a random sample size of n=10 (from a normal population) and a standard deviation of 5, how can I calculate the area under the sampling...

• Replies: 2
• Views: 4,640
08-25-2008, 04:11 PM

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