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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: 16,351
09-30-2005, 09:44 AM
1. ### Poisson Distribution - Optimisation

A store offers a new seasonal product featured. Let N be the random variable which means the number of clients who come to the store during the...

• Replies: 1
• Views: 128
Yesterday, 05:14 PM
2. ### Probability calculation on 2 similar vases with difference in time and backlog

Hi all, Below is a problem that we find hard to solve, any input would be much appreciated. In short, we're looking for the exact probability...

• Replies: 0
• Views: 136
07-21-2016, 07:34 AM
3. ### Calculating Probabilities

If a mechanical fault in a car occurs once in every 120 days, and I drive the car 260 days per year, what is the probability of a mechanical fault...

• Replies: 5
• Views: 252
07-20-2016, 12:59 PM
4. ### Mean and Variance - conditional probability

A public electricity supplier has a number of facilities numbered from 1 to 19. We suppose that for i = 1, 2,..., 19 , installation i produces...

• Replies: 0
• Views: 105
07-18-2016, 02:00 PM
5. ### Confirmation bias.

Hello. I am interested in confirmation bias. Specifically I am interested in when a hypotheses can be said to be no longer confirmation bias. ...

• Replies: 4
• Views: 204
07-15-2016, 08:57 AM
6. ### Conditional Probability - Exam

Someone can help me please, I need to understand them for my exam on Monday in next week. Today is Saturday.....Thanks a lot..... USING AND...

• Replies: 2
• Views: 19,461
07-13-2016, 01:00 AM
7. ### Hypergeometric problem

Hello everybody! :D I'm new to statistics and I'm struggling with a hypergeometric problem: Suppose I have a drawer with 100 socks in different...

• Replies: 2
• Views: 234
07-10-2016, 01:18 PM
8. ### Medals at the Olympics

Hi, I love sports and stats and so I am doing my Olympics research. I saw that there are 2 players from China's on each Badminton competition (MS,...

• Replies: 0
• Views: 252
07-05-2016, 04:34 AM
9. ### Probability Problem To Resolve

Hi, I need the solution to this problem to be able to resolve a situation at work. I believe some probability equation must be involved. ...

• Replies: 2
• Views: 363
06-30-2016, 05:12 PM
10. ### Is this right?

I'm doing a research paper in international relations and I need some help describing the data. For example, in 13 interventions in civil wars, I...

• Replies: 1
• Views: 206
06-30-2016, 02:31 PM
11. ### What is chance performance cut-off for a 2-part dichotomous response?

If subjects had to give 2-alternative forced choice responses for a task (Y/N) and then rate the certainty of their response (also 2-alternative...

• Replies: 1
• Views: 138
06-30-2016, 02:02 PM
12. ### New to probability

Can someone help me solve the following P(0.55≤ z ≤ 1.28). How does one determine a left side vs right side table?

• Replies: 1
• Views: 209
06-29-2016, 12:01 AM
13. ### Two dice are thrown simultaneously

Two dice are thrown simultaneously. 1.Find the probability of getting an odd number on the one and a multiple of three on the other. 2.what is the...

• Replies: 2
• Views: 265
06-26-2016, 11:19 AM

A group of telephone subscribers is observed continuously during a 80-minute busy hour period. During this time, they make 30 calls, with the total...

• Replies: 1
• Views: 296
06-20-2016, 08:48 AM
15. ### distributing labeled balls in unlabel! Statistics for Biological problem,help needed?

Hello everyone, I am a biology student and i am stuck with a problem, hence here. I have a large number of 10 different kinds of viruses in a tube...

• Replies: 1
• Views: 272
06-20-2016, 03:20 AM
16. ### Binomial distribution and rolling dice

I realized this was the homework forum and reposted it in general discussion since mine is not homework.

• Replies: 0
• Views: 157
06-17-2016, 03:26 PM
17. ### Probability distribution on next draw from random variable

I'm working on a game theory model of incomplete information, where players observe certain attributes via noisy signals. I am looking to solve for...

• Replies: 1
• Views: 105
06-17-2016, 11:55 AM
18. ### Interpreting the limiting distribution of markov chains?

Hi all, I have a few questions on the interpretation and application of the steady state or limiting distribution for a markov chain transition...

• Replies: 0
• Views: 511
06-16-2016, 07:16 PM
19. ### Super Bowl Pool Probability Question

Hey we were trying (and failing) to calculate the odds of winning our super bowl pool at least twice based on the below info: There are 100...

• Replies: 1
• Views: 314
06-16-2016, 01:59 PM
20. ### Obtaining Probability for costs above a certain threshold

Dear all, I never sought for help on a forum since I feel that many times the answer for a problem can be found if one reads books and searches...

• Replies: 4
• Views: 331
06-15-2016, 10:43 AM
21. ### Paper Notes in a Bag

Hello all, I have this problem, which I am not fully sure how to solve: In a bag there are 18 paper notes. On five of them there is the digit...

• Replies: 5
• Views: 232
06-15-2016, 06:47 AM
22. ### Hypergeometric problem

Hello all, I have some problems with this question. Can you assist ? Thanks ! In a cellar there are 3 bottles of wine which are 18 years old, 4...

• Replies: 1
• Views: 252
06-14-2016, 04:12 PM
23. ### Risk Analysis questions

Hi, I'm new on this forum! I have some question about risk analysis, I'm doing some exercices and I don't understand some points. 1) Limit of...

• Replies: 0
• Views: 243
06-10-2016, 03:02 PM
24. ### Exam tomorrow, urgent help needed.

Hello, first, im a bulgarian student, my exam is in bulgarian and i translated it to english via google translate, if its not understandable but you...

• Replies: 1
• Views: 190
06-09-2016, 03:27 PM
25. ### Business Predictability Scheduling Dilemma

Our business is working to change a longstanding practice of publishing fixed Buy Prices on a Quarterly basis. One of the impacts of this standard...

• Replies: 0
• Views: 169
06-08-2016, 09:57 AM
26. ### Help for an exercise please!

Hello! I am very confused about something. I am using a software for the reaction time, I have a distribution, mean and standard deviation. and 2...

• Replies: 4
• Views: 340
06-04-2016, 11:55 PM
27. ### Joint Density Function From Given Correlation

How do I find joint density function from a given correlation?

• Replies: 1
• Views: 190
06-02-2016, 01:14 PM
28. ### Interpretation of likelihood ratio and hypothesis testing

Even after extensive search, am unclear on some (basic) concepts regarding likelihood vs. frequentist approach in hypothesis testing. Can you...

• Replies: 0
• Views: 134
06-02-2016, 03:08 AM
29. ### calculating $E(Y)$

suppose X is random variable non negative with Distribution function F_{X}(x) and Y is random variable with Distribution function...

• Replies: 1
• Views: 200
BGM
05-31-2016, 01:56 PM
30. ### Hypothesis test of sample (yes/no) and proportions

Edit: I'm not sure whether this belongs in statistics or probability forum. Hi guys, I' prepping for exams with old exam questions and I'm...

• Replies: 0
• Views: 165
05-25-2016, 06:06 PM
31. ### Probability problem - no idea where to start

Sorry - my question was poorly written.

• Replies: 0
• Views: 160
05-25-2016, 05:27 PM
32. ### How to calculate probability of two samples

Hello everyone, Just need advice how to calculate probability of two samples in a 2 x 4 table. so say i have two groups (brown haired people...

• Replies: 0
• Views: 165
05-25-2016, 11:25 AM
33. ### Probability problem - descrete Random variable

post deleted...

• Replies: 0
• Views: 138
05-25-2016, 08:32 AM
34. ### Is the order of an event occurs in a sequences of events random?

I am interested in knowing how to analyse whether the order in which an event occurs within a sequence of events is random; i.e. is the likelihood of...

• Replies: 0
• Views: 112
05-25-2016, 06:20 AM
35. ### Easy Coin Flip Problem ???

Hi, I need help. Assume the probability of flipping a coin to heads 20 times in a row is 1:1,000,000 Q: Each day you wake up and flip a coin...

• Replies: 7
• Views: 535
05-18-2016, 01:54 PM
36. ### Roll a Dice (1)

1. Between two games offered to you, would you rather (i) roll a die once and get paid \$1 million for each dot on the upturned face, or (ii) roll a...

• Replies: 1
• Views: 265
05-17-2016, 08:21 PM
37. ### Roll 2 Dice (2)

2. If you roll 2 fair dice and add the points on each of the upturned face, what is the most likely sum? What is the probability of getting this sum?...

• Replies: 0
• Views: 176
05-17-2016, 05:32 PM
38. ### Probability question

A teacher says 40% of students study for a specific test. If she randomly selects 5 students, whats the probability that 3 studends did not study for...

• Replies: 2
• Views: 215
05-17-2016, 08:43 AM
39. ### Differences of proportions

Please forgive what I assume is the simplicity of these related problems, but I don't seem to find the solution elsewhere. 1) 2 cards are...

• Replies: 0
• Views: 163
05-16-2016, 08:52 AM

Hello together, I am a bit lost with this problem that I need to answer for a university project and I hope someone is able to help me solving...

• Replies: 1
• Views: 161
05-15-2016, 03:13 PM
41. ### should bayes therom be used?

Seems like a relatively simple question, but I'm missing it: There are 25 delinquent accounts in 100 accounts. If I choose 75 accounts out of the...

• Replies: 2
• Views: 263
05-15-2016, 06:41 AM
42. ### Conditional probability of functions. Small question

Hey, i was just looking at a question where the question is calculate: P( B(t) =< x| x=B(s) ). That is, calculate the probability that B(t) is less...

• Replies: 0
• Views: 182
05-12-2016, 06:29 AM
43. ### Moments of a random variable involving numerous Binomial Distributions

I am editing my post because it might have been unclear. Suppose X is a random variable involving 4 binomially distributed random variables: X...

• Replies: 6
• Views: 429
05-10-2016, 10:59 AM
44. ### Challenge: Card drawing probability

Hello everybody, This is my first post because this has been in my head and I couldn't hold it any longer! So here it goes: A friend of mine...

• Replies: 4
• Views: 323
05-10-2016, 06:32 AM
45. ### Determine the risk (probability) of meeting forecasted demand

Hi, I'm doing a project for a car company for my final year studying Industrial Engineering. The company forecast demand 4 months ahead but,...

• Replies: 1
• Views: 245
05-08-2016, 02:03 PM
46. ### Bayesian Approach To Combine Multiple Weighted Inputs

I'm beginning to learn about Bayesian theory but I'm stumped on the ideal approach for combining multiple weighted inputs. Here's an example to make...

• Replies: 2
• Views: 267
05-08-2016, 10:59 AM
47. ### logistic regression+test of hypothesis

Hello guys! I need your advice. I have done a logistic regression to estimate a probability of impaiment occurs or not. My indep.variables were...

• Replies: 2
• Views: 216
05-07-2016, 02:21 AM
48. ### Markov limit expectation

I need to find a limit involving a discrete finite state markov chain with absorbing state. It is given that: q(x,c) = r(x) + \beta E_{c'\lvert...

• Replies: 0
• Views: 152
05-06-2016, 10:43 AM
49. ### Number of Positives

Hi, If I have 128 samples and each sample has a 0.25 probability of being positive, what is the probability that I will have at least 24...

• Replies: 1
• Views: 182
05-02-2016, 10:01 PM
50. ### Probability question

I recently stumbled up on this question. Need help in solving this. N balls thrown at N baskets, what is the chance that a random basket will have...

• Replies: 17
• Views: 682
05-02-2016, 06:58 AM
51. ### Dice probability question

What are the odds of rolling 2d6(2 6-sided dice) three times and getting two 3s? How about rolling 4 times; 5 times? I know rolling a 2d6 has a...

• Replies: 1
• Views: 243
04-30-2016, 01:36 PM
52. ### The random variable and Probability. 2 problems

Hi, can anyone help me out with these 2 problems? Sorry for language mistakes, translated from German.

• Replies: 1
• Views: 184
04-30-2016, 11:52 AM
53. ### Probability Of insurance sales

Just a disclaimer I know I am omitting important factors such as competition, earned premium etc etc. I'm just using this exercise so I can start...

• Replies: 7
• Views: 543
04-26-2016, 02:50 PM
54. ### Normal distribution

Hi all, I'm generating a random normal distribution and i don't control the mu and sigma (its a matlab function that i need to use because the...

• Replies: 2
• Views: 239
04-26-2016, 01:31 AM

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