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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: 31,151
09-30-2005, 09:44 AM
1. ### The Expectation of a Majority random process

I want to know the answer of the following question, I will be so thankful if somebody gives me some clues: "We start a random process with Nb blue...

• Replies: 1
• Views: 1,437
BGM
03-15-2016, 10:41 PM
2. ### Probability of most expensive item automatically being purchased

Hi all, many thanks for any input on this perplexing problem: If a sporting good store offers a coupon as follows: Free soccer ball OR free...

• Replies: 0
• Views: 1,268
03-12-2016, 09:55 AM
3. ### Why doesent MLE equal in normal distribution when mean = variance?

Sadly I´m not familiar with LaTex so I have attached my question as a picture. I have tried the best I can, but now I´m stuck :(

• Replies: 11
• Views: 1,942
03-12-2016, 01:24 AM
4. ### Please I need help with those probability problems

Please help me, I will really appreciate it! 1) You are dealing a standard hand of 5 card stud, 1 card face down, 4 face up. Ignoring the cards...

• Replies: 3
• Views: 1,631
03-10-2016, 03:12 PM
5. ### Golf Scores

Yesterday my buddy and I both shot 84, 12 over par. But although we had the same gross scores we noticed that we did not tie any single hole. ...

• Replies: 4
• Views: 2,261
03-08-2016, 08:29 AM
6. ### Normal Law

Hi there will be very greatfull if anyone can help: If X represent the daily yield of the S&P500(US Stock indices) and Y represent the daily yield...

• Replies: 3
• Views: 2,303
03-07-2016, 06:25 AM
7. ### Manufacturing machine probability problem

There are three possible environment conditions: normal, rainy and hot. Rainy and hot days may be risky to a system that has been deployed, but...

• Replies: 5
• Views: 3,426
03-06-2016, 02:29 AM
8. ### Need to determine the probability

In a call center 180 calls are received at random over a period of 12 hours. Then the probability to receive calls between 180 to 200 every 12 hours...

• Replies: 1
• Views: 2,490
03-05-2016, 04:45 PM
9. ### Probability of opposite of mean

I am trying to calculate the probability of reverse preferences for an outcome. I have the mean and standard deviation of the predicted outcome, how...

• Replies: 5
• Views: 2,027
03-03-2016, 07:12 AM
10. ### 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: 2,341
BGM
03-01-2016, 11:01 PM
11. ### Excel Simulation (Monte Carlo) help

Hi all, I've been racking my non-statistical brain on my Excel simulation (monte carlo sim predicts profit). I have created the model and as I...

• Replies: 3
• Views: 2,373
03-01-2016, 10:20 PM
12. ### Help with this permutation problem?

Hi! So I'm struggling with a lot of things in probability, and one being permutations and finding them. There's a problem, and if I know how to...

• Replies: 3
• Views: 1,066
02-28-2016, 02:15 AM
13. ### Probability Scenario

Here’s the scenario: A committee of 9 people is deciding which 5 people of 14 candidates should be hired for a job. In order to be hired, a...

• Replies: 4
• Views: 1,862
02-25-2016, 07:02 PM
14. ### Probability question

Let's say we have 60 balls of which 17 are red and the rest black. If I pick 7 balls at random, what is the probability that i picked at least 3 red...

• Replies: 5
• Views: 1,466
02-25-2016, 02:32 PM
15. ### Distribution of p-values

Hello By way of some background, I have a data set with 160 observations. Each observation is a patient and the variable of interest is the...

• Replies: 2
• Views: 1,238
02-24-2016, 04:57 AM
16. ### How to calculate the odds that Team A will beat Team B given their records to date?

I would like to find a formula to calculate the probability that Team A will beat Team B taking into account just their records to date. For...

• Replies: 5
• Views: 3,719
02-23-2016, 02:16 PM

Hello, I have a discrete distribution: with a chance of a delay (in hours) I came out of 80 000 measurements to a table with max 40 h delay and...

• Replies: 2
• Views: 1,109
02-22-2016, 10:09 AM
18. ### Scoring at least once out of ten attempts

A football player has the chance of 0.14 to score (single kick). If he kicks the ball 10 times, what is his chance of scoring at least once? Can...

• Replies: 3
• Views: 1,823
02-20-2016, 05:28 PM
19. ### 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: 2,164
02-18-2016, 11:54 AM
20. ### Estimating probability of malignancy in skin moles

If a certain type of skin mole has 1% probability of malignant change over a lifetime, what is the probability of malignant change if a person has...

• Replies: 8
• Views: 1,704
02-17-2016, 04:38 PM
21. ### Confidence intervals for proportions: approximating a discrete distribution with a co

I saw on this website http://onlinestatbook.com/2/estimation/proportion_ci.html The following quote about calculating a CI for a proportion: ...

• Replies: 3
• Views: 1,771
02-16-2016, 03:48 PM
22. ### Finding Joint Posterior Density of Poisson and Exp?

Hi, Some friends and I have been stuck on this bayesian stats question for five days now, please shed some light if you can :wave: We've tried to...

• Replies: 0
• Views: 1,601
02-16-2016, 02:03 PM
23. ### Coin and die probability

If I repeatedly and alternately toss a coin and roll a 6 sided die beginning with the coin what is probability of getting a head before a 6

• Replies: 6
• Views: 1,563
BGM
02-16-2016, 01:38 PM
24. ### Support of a Distribution?

Does the support of a distribution change? For example lets say Y~Beta(20,30) the support is from 0 to . However what would the support be for 3Y+2?...

• Replies: 2
• Views: 1,361
02-14-2016, 05:33 PM
25. ### Probability of someting that is yet to happen.

Dear Reader, I was wondering if it would be possible to generate or calculate a probability or likelyhood of an event happening whilst you dont...

• Replies: 2
• Views: 1,744
02-12-2016, 03:37 AM
26. ### Expected number of events in a simple birth-death process.

I have a simple birth-death process with parameters, beta=4/5v and the initial population size is 6. I have calculated that the birth rate= 4/9 and...

• Replies: 0
• Views: 2,399
02-11-2016, 05:38 AM
27. ### Probability the First 2 chips are different colors

Question: A bowl has three red and three blue chips. If two chips are randomly selected simultaneously, and then a third chip is selected, what is...

• Replies: 0
• Views: 1,263
02-10-2016, 07:12 PM
28. ### Poisson Process Exercise

Hi everyone i'm new in this forum and i wanna ask if there someone that can help me with this kind of exercises in which i have an arrival process...

• Replies: 1
• Views: 2,393
BGM
02-10-2016, 08:41 AM

so, i just had this test. and the solution for it has already been published. the thing is, i realy dont agree with their explenation for one of the...

• Replies: 1
• Views: 1,370
02-03-2016, 06:01 PM
30. ### Combining two data sets using Bayesian methods

Hi, I want to combine multiple data sets of customer spend data together. I want to calculate how the bounds of the data decrease as I add in more...

• Replies: 0
• Views: 924
02-02-2016, 11:18 PM
31. ### Mann-Whitney U Test

Hello everyone, Thank you all for providing and maintaining this forum. I'm currently working with two data sets collected ten months apart,...

• Replies: 3
• Views: 1,159
02-02-2016, 04:27 PM
32. ### Monte Carlo Assistance

Hello, I have a monte carlo simulation built. Need assistance tweaking. Please reach out if interested. Tom

• Replies: 0
• Views: 1,476
02-01-2016, 11:00 PM
33. ### Permutations with repeats in groups

Hi guys, need help with the following question Permutation formula with repeats is as follows The number of different permutations of n objects,...

• Replies: 1
• Views: 1,832
01-31-2016, 03:22 AM
34. ### Assistance with probability problems before exam

Hello, I am a student in International Trade and I have a Statistical exam tomorrow (in 12 hours to be precise). I would really need your help and...

• Replies: 0
• Views: 1,114
01-29-2016, 03:20 PM
35. ### Assistance with Probability example

Consider a very simple card game, there are 16 cards. The cards have 4 ranks (Jack, King, Queen and Ace) and 4 suits (Clubs, Diamonds, Hearts and...

• Replies: 0
• Views: 1,148
01-28-2016, 07:02 AM
36. ### Assistance with Monte Carlo Method for Board GAme

Outcomes 16 cards. The cards have up to four values. I need assistance building a data set I can analyze. Simulating a starting hand, and...

• Replies: 5
• Views: 2,148
01-27-2016, 06:58 PM
37. ### Bayesian serial chain

I am trying to understand Bayesian networks and particularly causal (serial) chains. It is defined as P(C|A&B) = P(C|B).This means that the...

• Replies: 0
• Views: 1,503
01-23-2016, 01:06 PM
38. ### Bayesian formula with multiple events

I am trying to predict next location of the user knowing his current (t) and previous location (t-1). I am trying to use Bayesian networks for this....

• Replies: 0
• Views: 1,251
01-23-2016, 10:44 AM
39. ### Probability for a CHi-square, normal, and binomial in Excel.

Never mind...

• Replies: 0
• Views: 1,150
01-23-2016, 07:29 AM
40. ### Best To Draw First Or Last?

Hi, newbie non mathematician looking for an answer to a long debated question in angling. When fishing a competition we draw a random number (say...

• Replies: 5
• Views: 2,244
01-20-2016, 01:46 PM
41. ### Probability - Data Distribution

Good day - I have a question. I have data set that follows a Weibull distrbution as follows: 9.15 + WEIB(0.827, 2.68) How can I translate this...

• Replies: 0
• Views: 1,530
01-19-2016, 02:32 AM
42. ### Interesting probability question I need help with...

Hi all, new to the forum so please excuse any newbie traits I might have.. I have a question I need help with as I'm sure I'm missing something.....

• Replies: 3
• Views: 1,085
01-18-2016, 08:27 PM
43. ### Change variable PDF with less variables than before

My question is very simple, I have a probability density function that depends on four variables p(x1,x2,x3,x4). Now each of those variables depend...

• Replies: 0
• Views: 1,182
01-18-2016, 04:02 PM
44. ### System Response Time Alerts - Choosing a Statistical Method

Hi It's been a long time since I had to use statistics in anger, so please bear with me. I have a test running that measures the response time of...

• Replies: 1
• Views: 1,520
01-18-2016, 03:05 PM
45. ### P(Z<z), Z=X if X<=1, Z=Y+1 if X>1

So here is the question X∼exp(1)X Y∼exp(2)Y (exponentialy distributed) X and y are independent. Z=Xif x≤1. Otherwise Z=Y+1. What is the...

• Replies: 2
• Views: 1,166
BGM
01-17-2016, 10:13 PM
46. ### How to develop probability formula?

I am trying to come up with an approximate formula for the failure probability of an event which can be caused by four independent things. I have...

• Replies: 0
• Views: 1,515
01-17-2016, 05:13 AM
47. ### Conditional probability

Hello, I'm having an issue with a problem. I just have no clue how to solve it. A machine part may be selected from any of three manufacturers...

• Replies: 2
• Views: 2,058
01-16-2016, 10:21 PM
48. ### Probability of Winning the Lottery vs. Being Struck by Lightning

I operate a 100-person pool that plays the Powerball and Mega Millions lottery. I'm looking for a rational way to compare the odds of us winning a...

• Replies: 0
• Views: 1,201
01-16-2016, 11:52 AM
49. ### Temporal synchronicities

Hi, My cat died five days ago. The day after, when we buried him, I happened to look at my mobile phone at 17.17, 19.19, 21.21. On Tuesday I...

• Replies: 0
• Views: 1,092
01-14-2016, 09:27 AM
50. ### Bivariate transformation?

Hello, I'm having problem with a book question from statistical inference, Casella, Berger excercise 4.19 a). X_1 and X_2 are two i.i.d R.V -...

• Replies: 9
• Views: 1,820
01-11-2016, 08:37 PM
51. ### Probability Question

Hi all, I have a question here. Say if we have 24 columns. Each column can take a hex number (0 to F). What is the probability that at...

• Replies: 0
• Views: 1,116
01-11-2016, 12:44 AM
52. ### Quick Population / Media Prob question

This is hopefully a fairly quick conditional probability question for you guys. Imagine a total population of 22MM people and I am running a...

• Replies: 0
• Views: 1,222
01-10-2016, 12:47 PM
53. ### Easy probability question

can anyone please help me with the easy probability question, "If there were 3062 people in a room and 90% of them had a red shirt on, 60% had jeans...

• Replies: 3
• Views: 1,931
01-08-2016, 10:18 PM

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