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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: 30,349
09-30-2005, 09:44 AM
1. ### Median and Mean of Independent Random Variables

Hello, Here is the question: Let X_1,X_2, . . . ,X_n be random variables with the density \frac{1}{1+x^2} for x \in ({-\infty},{\infty}) ;...

• Replies: 5
• Views: 8,408
07-08-2012, 09:54 AM
2. ### Deriving posterior probability from frequencies

I'm working through an introductory Bayesian stats text: Doing Bayesian Analysis. Having been away from stats for a while and having never working...

• Replies: 5
• Views: 3,594
11-29-2012, 01:15 PM
3. ### Probability Question

Question 1: Suppose that in a weekly lottery you have probability .02 of winning a prize with a single ticket and that you buy 1 ticket per week...

• Replies: 5
• Views: 3,417
BGM
10-19-2011, 03:46 PM
4. ### Classical Probability

Greetings from new comer! Here is my question I could not figure it out by myself: There are two types of bags H and R in a single box (black box...

• Replies: 5
• Views: 2,423
10-06-2011, 08:09 PM
5. ### I need some help with Probability Problem.

The local barber shop is home to three barbers, 1, 2, and 3. The barbers appear identical but vary in their ability to provide good haircuts. The...

• Replies: 5
• Views: 3,806
BGM
10-09-2011, 01:53 AM
6. ### Probabilty Question

I am looking at 6 events. The probabilities of each occuring independantly are as follows: Event 1- 7% Event 2- 4% Event 3- 7% Event 4- 4%...

• Replies: 5
• Views: 3,337
BGM
10-19-2011, 03:46 AM
7. ### Independent Event if A is a subset of B ???

I have a questions regarding Conditional Probability. Two events A and B are independent if: P(AnB)=P(A)*P(B) Is this always the case or are...

• Replies: 5
• Views: 15,839
10-23-2011, 04:55 PM
8. ### 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: 6,236
10-26-2011, 09:10 PM
9. ### Difficult probability question

Hi - I'm really stuck with this question. I can't find any example quite like it anywhere: Two friends, Ben and Jerry, agree to a random swap of...

• Replies: 5
• Views: 3,297
10-28-2011, 11:42 AM
10. ### maximum of parabola

Hi who determine maximum of parabola? thanks

• Replies: 5
• Views: 3,452
11-07-2011, 12:14 PM
11. ### Special interest groups want my money

and they say that they lobbied for so-and-so bill and it passed and so I am to conclude that they are effective. Aside from a controlled...

• Replies: 5
• Views: 2,146
11-29-2011, 11:54 AM
12. ### multinomial

by using multinomial distribution: p=N!/M1!M2!M3! *P1^M1*P2^M2*P3^M3 P1=10^-5*5000=0.05 (fail to deploy on activation with a 10^5 probability)...

• Replies: 5
• Views: 2,389
12-08-2011, 07:09 AM
13. ### almost sure convergence

Hi, I've got this question I'm trying solve for days already. Let Xn be random variable = 2 with prob 1/3 and = 1/2 with prob 2/3 Let Zn be...

• Replies: 5
• Views: 4,291
BGM
01-13-2012, 04:20 AM
14. ### Its easy for you pros, but i need help anyways!

I have a simple stats/probability question. I need a formula to calculate probability of death. Lets say 20% of people with cancer will die this...

• Replies: 5
• Views: 2,196
BGM
12-16-2011, 11:23 AM
15. ### What is the number of combinations for a 6XN combination lock?

Hi, does anyone know how to calculate the total number of combinations a 6XN combination lock .i.e. each of the 6 wheel columns has N possible...

• Replies: 5
• Views: 1,910
12-26-2011, 02:02 PM
16. ### pdf less than cdf

Let us consider the standard normal distribution. For most of the negative values the cdf is less than the pdf. eg. cdf(-1)=0.15 while pdf(-1)=0.24....

• Replies: 5
• Views: 2,750
01-13-2012, 01:58 PM
17. ### quick question: probability of being dealt a royal flush?

if you have a standard deck of cards and are dealt 5 cards randomly, what are the chances of getting a royal flush? i feel like this is pretty...

• Replies: 5
• Views: 8,638
02-02-2012, 05:57 PM
18. ### [SOLVED] New to Probability

Hello! I am taking my first stats course in University, and I am normally pretty good with number (finished with A+s in linear algebra, and...

• Replies: 5
• Views: 4,281
02-01-2012, 11:17 PM
19. ### Defining parameter following survival function

I am a newbie, with limited statistical skills, so please excuse/correct basic mistakes. My question is about the characteristics of a...

• Replies: 5
• Views: 1,785
BGM
02-09-2012, 02:10 PM
20. ### 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: 3,072
03-16-2012, 01:03 PM
21. ### 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: 7,542
03-26-2012, 10:34 PM
22. ### null hypothisis and p value

This is my question; A medical Researcher knows that the generally accepted level for Triglycerides in Adult Males is 110 mg/dl. Fearing that men...

• Replies: 5
• Views: 2,598
04-02-2012, 03:45 PM
23. ### Can't understand what this question means

Let X and Y have exponential distributions Exp(3) (i.e, with the parameter 3) We assume that X and Y are independent. Let U=x+2Y and V=-x+Y....

• Replies: 5
• Views: 1,987
04-05-2012, 07:23 AM
24. ### dice probability

• Replies: 5
• Views: 1,662
04-13-2012, 05:01 AM
25. ### Bimonial aggregation

Hi, I'll try to keep this brief. I'm having troubles working with the binomial for a sporting event. Here's a totally simplified and fictional...

• Replies: 5
• Views: 2,037
04-12-2012, 09:05 AM
26. ### discrete approximation of a normal distribution

Hi, i have a normal distribution \mu=10, \sigma=1 and need a discrete approximation of it in order to calculate e.g. P(X=8). How can i...

• Replies: 5
• Views: 7,378
04-16-2012, 11:05 AM
27. ### Poisson or Binomial

Hi, im trying to make sure i have the difference between when to use Binomial and Poisson distributions firmly understood. Regarding the following...

• Replies: 5
• Views: 9,502
05-03-2012, 08:19 AM
28. ### Is independence indpendent on measure?

Is it possible that 2 sigma-algebras could be independent under one measure but not independent under another? Many thanks.

• Replies: 5
• Views: 1,999
05-25-2012, 04:16 PM
29. ### Adding normal distribution - z-scores

Hi - I have a quick question. I understand that the sum of two normal distributions is a normal distribution. Now let's say I have the z-score...

• Replies: 5
• Views: 8,643
06-05-2012, 09:21 AM
30. ### random variables - expected value of time taken to perform a service

Hello everyone, My name is Alex, I am from Spain and I need help. I am not trained in statistics and all I know is a little bit from school and...

• Replies: 5
• Views: 2,032
07-31-2012, 01:35 AM
31. ### Joint Distribution

Hi,I need some help here: Toss a fair coin twice. Define X,Y and Z as : X=1 if HH or HT X=0 if TH or TT Y=1 if HH or TH Y=0 if HT or TT

• Replies: 5
• Views: 1,933
08-01-2012, 08:03 PM
32. ### Name for the expression E(Y|X)*Prob(X)

I am working with a term which is an expectation conditional on an event, multiplied by the probability of the event occuring. For example,...

• Replies: 5
• Views: 2,235
09-12-2012, 07:56 PM
33. ### Predicting probability with standard deviations, mean high and low values.

I registered on this forum specifically to ask this question. This is not homework, it's simply a for fun/hobby problem I am trying to solve. This...

• Replies: 5
• Views: 5,244
06-14-2013, 03:55 AM
34. ### Help Needed In Solving For Mean of Normal of CDF

(My stats are a bit rusty so please forgive my clumsy notation and terminology.) Okay so given values for A,B and a probability p: p*F(A;mu,1)...

• Replies: 5
• Views: 1,957
09-04-2012, 01:01 PM
35. ### Probability, American airlines!

North American Airlines, on average, delivers three quarters of their flights to the arrival gate within 15 minutes of schedule in august 2012. ...

• Replies: 5
• Views: 1,789
09-29-2012, 04:49 PM
36. ### Cell phone mean and standard deviation

A recent study "privacy and data management on mobile decies"the pew research center, Showed that 18.6% had their location tracking feature turned...

• Replies: 5
• Views: 2,667
09-29-2012, 03:38 PM
37. ### Poisson distribution question on lambda

An office printer has a paper jam on average 2 times in 3 weeks. THe number of paper jamsfollows a poisson distribution Findd the probabilitythat...

• Replies: 5
• Views: 2,714
10-08-2012, 06:32 AM
38. ### Help!!

In a recent survey about appliance ownership, 58% of the respondents indicated that they own Maytag appliances, while 24% indicated they own GE...

• Replies: 5
• Views: 4,626
10-21-2012, 10:34 PM
39. ### Time Independent Poisson Regression

Hi there, I'm new to all this and am looking for an explanation in Layman's Terms Level 1 (level 1 being your average primate.....level 10 being a...

• Replies: 5
• Views: 4,649
11-03-2012, 02:30 PM
40. ### Hypothetical scenario for probability? How would you solve this?

So here's a hypothetical scenario: From one source (let's call it A), the probability of the color red is 0.2 and orange is 0.8. From a second...

• Replies: 5
• Views: 2,223
10-24-2012, 03:25 PM
41. ### Extremely Simple Probability Calculation

I am working on a project (non-school, non-homework, math for fun :D) in which I need to determine a fairly simple probability. I need to determine...

• Replies: 5
• Views: 1,202
12-08-2012, 04:22 PM
42. ### Determining the probability that two data sources are the same

I've been looking for the answer to this problem for a while now and I think a large part of it is that I don't know how to frame the question. Here...

• Replies: 5
• Views: 2,020
05-10-2013, 03:50 AM
43. ### Complex question of combinatorial probability

I would like to know if an equation exists or can be defined for computing the probability of drawing (at random from a population of elements) all...

• Replies: 5
• Views: 1,621
12-25-2012, 05:32 AM
44. ### Ratio of two independent gamma random variables

Hello, I am working on a problem in which I need to find the expectation of the square root of the ratio of two independent gamma random variables...

• Replies: 5
• Views: 6,404
BGM
01-17-2013, 10:44 AM
45. ### Help With Potential Textbook Error

I'm reading through the statistics chapter in my research methods textbook and think I may have found a mistake. I was hoping someone here could...

• Replies: 5
• Views: 796
BGM
02-20-2013, 11:15 AM
46. ### Having trouble with an expected value manipulation

I'm having a little trouble with part a. Okay, okay, I'm having trouble with all of it, but I'm guessing that solving a will help with the rest....

• Replies: 5
• Views: 2,745
01-31-2013, 10:54 PM
47. ### Sequence probability, need a cross-check

This is not a homework problem so, I don't have a grader or a TA to assist. Short problem: In a randomly generated 5 digit number (including...

• Replies: 5
• Views: 1,770
05-02-2013, 01:34 PM
48. ### Expectation/probability question (sorta like Craps, maybe?)

I'll try to be as brief as possible: I have a number of events that can happen, say e1, e2...eN. N isn't particularly large. Each event has a...

• Replies: 5
• Views: 2,248
BGM
12-28-2012, 03:05 AM
49. ### Discrete Optimization Question

1. The problem statement 9. This is a simplified inventory problem.Suppose that it costs c dollars to stock an item and that the item sells for s...

• Replies: 5
• Views: 3,277
02-15-2013, 12:48 PM
50. ### Proportion and Expected

The Proportion of college student who take Stats is P=.22 A)If 200 college students are selected at randon, how many would you expect to take...

• Replies: 5
• Views: 1,529
05-11-2013, 09:50 PM
51. ### Different arrangments of n 0's and m 1's

This simply stated problem is giving me some trouble: How many different ways can I arrange n 0's and m 1's? Perhaps someone would direct me...

• Replies: 5
• Views: 1,670
06-06-2013, 05:54 AM
52. ### how did Komogorov's Probability axioms became axioms?

i was reviewing some of my notes on real analysis yesterday and started thinking about something my prof said the first day. he commented on how...

• Replies: 5
• Views: 3,237
07-30-2013, 05:46 PM
53. ### counting probability

i need some help counting probability using Bayes theorem given that 1/10 of message is a spam message. spam detector will correct identify a...

• Replies: 5
• Views: 2,099
07-28-2013, 09:27 AM
54. ### Inquisitive son problem!

Hi, I'm not sure if this is the right place to post but here goes... My son and myself have been building a quincunx machine as part of a project...

• Replies: 5
• Views: 1,877
07-21-2013, 02:35 PM
55. ### Poisson distribution problem

Hello everybody, Im needing some help with the following problem: The number of defects every 100meters responds to a Poisson distribution with...

• Replies: 5
• Views: 1,493
BGM
07-05-2013, 12:38 PM
56. ### Birthday problem using Bernoulli trails

I came up with this problem: What is the approximate probability that no two people in a group of seven have the same birthday? So, I set up...

• Replies: 5
• Views: 2,903
09-02-2013, 03:36 PM
57. ### Generalizability of results / External validity

Hi everyone, Employment of probability sampling to draw a sample from the population in a quantitative study (cross-sectional design, data...

• Replies: 5
• Views: 3,476
09-19-2013, 11:59 AM
58. ### Help with cdf

I'm having trouble with grasping cdf's. If I have a cumulative distribution function F(x) = .0 ----- x<-2 ...

• Replies: 5
• Views: 1,719
10-07-2013, 12:12 PM
59. ### Bounded in Probability proof

Hi all, I could use some help understanding the following proof so please feel free to pitch in! Consider any random variable X with...

• Replies: 5
• Views: 4,677
BGM
10-02-2013, 11:32 AM

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