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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: 31,161
09-30-2005, 09:44 AM
1. ### Markov probability and stock return

Suppose I have a stock that in in each timeperiod gives a return depending on the state s. Assume that the process starts in s_1 and gives the return...

• Replies: 0
• Views: 1,864
10-06-2016, 07:38 AM
2. ### Row problem with mandatory empty seats

Here is the exact question: Suppose that 39 students (you being one of them) are randomly seated in a long row of 120 seats. How likely is it that...

• Replies: 1
• Views: 2,098
BGM
10-06-2016, 01:25 AM
3. ### "Exploding" Dice Probability (Talk to me like I'm an idiot)

Hi All, First off, let me just start by saying that my mathematical savvy leaves a lot to be desired. I didn't take a lot of math in school, and...

• Replies: 1
• Views: 2,016
BGM
10-06-2016, 01:04 AM
4. ### Convergence question

X1, X2,.......Xn is a sequence of random variables. Show that Xn converges to b in quadratic mean if and only if The limit (n approaching...

• Replies: 2
• Views: 4,289
10-05-2016, 08:26 AM
5. ### Racing

Hi all, I need some help with some statistical work: So, I am trying to understand how I can transform time into probability. I have 2...

• Replies: 0
• Views: 2,249
10-03-2016, 08:48 AM
6. ### Conditional Probability

Hello to everyone. I am new in the forum and in the statistics at all. I have some homework to do and I can't figure it out. I am trying to do those...

• Replies: 4
• Views: 2,245
10-02-2016, 06:10 AM
7. ### Probability of an attribute in one member of a population

Wondering whether the following can be calculated (or whether more info is needed). Here's the population: A - 224,000,000 (72.5%) B - ...

• Replies: 5
• Views: 2,412
09-28-2016, 04:03 PM
8. ### MSc Research Probability Survey

Hi all, i'm currently in year 2 of a part-time MSc by research into Causal Bayesian Networks at York university; and as part of the study i'm...

• Replies: 0
• Views: 1,572
09-28-2016, 01:52 PM
9. ### Chebyshev's Inequality problem

Let X ~ Poisson (lambda). With Chebyshev's Inequality, show that P(X >=2 lambda) <= 1/lambda The way I thought to interpret this theorem was...

• Replies: 9
• Views: 2,740
09-27-2016, 09:46 PM
10. ### Probability - help working out a betting probability scenario

Need a little help and guidance: Tennis match. Player A to hold serve is 85%, Player B to hold serve is 80%. What is the probability that...

• Replies: 0
• Views: 1,426
09-26-2016, 09:33 AM
11. ### Probability Questions - Cannot seem to figure out

I have been working on this problem for a few days now and cannot seem to at least find a formula or example in my book that works. Any help would be...

• Replies: 2
• Views: 2,165
09-24-2016, 10:23 AM
12. ### Have you seen this formula before

'Routine to determine the probability of failure given the mean and standard deviation of the capacity and demand. RMinusQ =...

• Replies: 0
• Views: 1,911
09-22-2016, 03:13 AM
13. ### This is a work question. Thanks!

I am trying to calculate the chances of the wrong number being put in a box. Lets say I have three boxes out of 25 on an assembly line. Each box will...

• Replies: 2
• Views: 2,245
09-21-2016, 08:57 AM
14. ### Game Probability Question

Hi, I am playing a game. I win with an 88% chance and lose with 12% probability. If I have won 20 games in a row what is the probabilty that I...

• Replies: 4
• Views: 2,195
09-18-2016, 11:23 PM
15. ### Categorizing reasons for predictions in a model

Hi. I have built a predictive model using decision trees in SPSS modeller. The model predicts which customers are likely to leave based on...

• Replies: 0
• Views: 1,948
09-15-2016, 07:16 AM
16. ### Conditioning on more than one event

Lately, I've been studying conditional probability. I'm working with the following theorems: 1. P(A|B)=P(A,B)/P(B) (the comma represents...

• Replies: 4
• Views: 2,124
09-07-2016, 09:58 PM
17. ### What type of distribution is being described (binomial or poisson)?

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• Replies: 2
• Views: 2,988
08-26-2016, 07:59 AM
18. ### What would the Null Hypothesis be for predicting sports outcomes?

So I made a program to predict the outcome of baseball games, as either a W or a L for the home team. I want to know if my program and algorithm are...

• Replies: 3
• Views: 2,185
08-26-2016, 03:07 AM
19. ### Use of Bayes Theorem

Hi, I am new here, thanks for having me. I am not a statistician though I have done a stats course at Uni (a long long time ago!). I am trying to...

• Replies: 0
• Views: 1,413
08-25-2016, 08:32 PM
20. ### Incidence rate in population and in random sample

How can I anser a question like the following: When the true incidence rate of an event in the population is "X" (say, 12%), how likely is it that...

• Replies: 1
• Views: 1,243
08-25-2016, 04:16 PM
21. ### conditional probability

For a combined ELISA-Western blot blood test for HIV positive status, the sensitivity P(positive test |HIV) is about 0.999 and the specificity...

• Replies: 2
• Views: 1,743
08-25-2016, 02:56 PM
22. ### False positives

Hi everyone, This is my first post and had a basic (I think) question. Are false positives by definition a conditional probability? I was...

• Replies: 12
• Views: 2,200
08-14-2016, 01:38 AM
23. ### Poisson curve for low lambda

Hello, I'm quite new to probability and currently trying to understand the different distributions. I see the Poisson curve is weirdly shaped...

• Replies: 6
• Views: 1,524
08-12-2016, 10:32 AM
24. ### Continuity Correction and probability using standard normal distribution table

I having trouble understanding the Z score along with getting my mean/SD with the below question. I need to know the break down of "how" rather than...

• Replies: 1
• Views: 1,897
08-04-2016, 08:27 PM
25. ### Vehicles accident probability

Hi, I would like to know the probability of Vehicles accident in a street. Which kind of probability distribution should I use? Please Help me :)...

• Replies: 2
• Views: 1,973
08-02-2016, 05:58 PM
26. ### Conditional distribution of 3 multivariate normal distribution vairables

what is the conditional distribution of variable a, given that u know b and c, if a,b,c obey multivariate normal density?

• Replies: 3
• Views: 1,744
07-31-2016, 12:20 PM
27. ### Probability question

there are two roads from A to B, and two roads from B to C.each of the four roads has independently probability 1/10 of being blocked by snow.What is...

• Replies: 0
• Views: 2,042
07-29-2016, 10:41 AM
28. ### conditional expectation given sum

Hello, I need your help. Suppose: X\sim N(0,\sigma^2_x), Y\sim N(0,\sigma^2_y) , X, Y are independent, and c\in R. I need to find an...

• Replies: 0
• Views: 2,407
07-28-2016, 03:58 PM
29. ### Probabilistic curves study, how to?

Hi everybody! I am working with severals probability curves and I would like to compare variability between them. Further, I would like to compare...

• Replies: 0
• Views: 1,768
07-26-2016, 10:16 PM
30. ### 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: 1,784
07-24-2016, 05:14 PM
31. ### 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: 2,055
07-21-2016, 07:34 AM
32. ### 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: 1,197
07-20-2016, 12:59 PM
33. ### 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: 1,121
07-18-2016, 02:00 PM
34. ### 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: 2,213
07-15-2016, 08:57 AM
35. ### 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: 30,917
07-13-2016, 01:00 AM
36. ### 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: 2,249
07-10-2016, 01:18 PM
37. ### 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: 1,740
07-05-2016, 04:34 AM
38. ### 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: 1,372
06-30-2016, 05:12 PM
39. ### 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: 1,334
06-30-2016, 02:31 PM
40. ### 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: 946
06-30-2016, 02:02 PM
41. ### 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: 2,307
06-29-2016, 12:01 AM
42. ### 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: 1,716
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: 1,439
06-20-2016, 08:48 AM
44. ### 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: 1,385
06-20-2016, 03:20 AM
45. ### 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: 1,203
06-17-2016, 03:26 PM
46. ### 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: 1,118
06-17-2016, 11:55 AM
47. ### 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: 1,583
06-16-2016, 07:16 PM
48. ### 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: 1,483
06-16-2016, 01:59 PM
49. ### 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: 1,728
06-15-2016, 10:43 AM
50. ### 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: 1,480
06-15-2016, 06:47 AM
51. ### 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: 1,170
06-14-2016, 04:12 PM
52. ### 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: 1,175
06-10-2016, 03:02 PM
53. ### 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: 2,425
06-09-2016, 03:27 PM
54. ### 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: 1,371
06-08-2016, 09:57 AM
55. ### 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: 1,406
06-04-2016, 11:55 PM
56. ### Joint Density Function From Given Correlation

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

• Replies: 1
• Views: 1,435
06-02-2016, 01:14 PM
57. ### 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: 834
06-02-2016, 03:08 AM

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