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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: 30,353
09-30-2005, 09:44 AM
1. ### basic problem computing pdf

If I have a pdf, say X~Uniform and Y= -X, would the pdf of Y be 1/6 ? How would I get the pdf using P(-X < - y) = P(X > y) = 1 - P( X < y) = 1-...

• Replies: 2
• Views: 1,571
11-29-2013, 03:22 AM
2. ### basic proofs/results in regression

I'm taking a regression class and were working on the location model just to get practice before the real thing. We've been given some proofs for HW...

• Replies: 2
• Views: 4,903
09-14-2008, 02:50 PM
3. ### Basic Question

Hi all, I feel a little embarrassed about this, but: what is the rule linking the probability of an event A to the weighted sum of its sub-events?...

• Replies: 2
• Views: 1,369
12-04-2011, 09:43 PM
4. ### Basic Question

Ok the answer might be really obvious here but I am getting a blank at the moment. If there is a 20% chance of a child getting a disease from...

• Replies: 2
• Views: 1,482
05-25-2012, 12:23 AM
5. ### Basic question about notation

I'm very sorry, perhpas it is a very basic question but I have I doubt about notation: What does it mean this statement?: E(X)=\int xdF, where F...

• Replies: 2
• Views: 849
11-11-2012, 10:10 PM
6. ### Basic question about the normal distribution

So it seems like different distributions have different kinds of "experiments" associated with them, like how you use the binomial distribution when...

• Replies: 3
• Views: 2,154
07-31-2011, 02:31 AM
7. ### Basic Question on Random Variables

My basic understanding is the following: Upper-Case RV: i.e. X_1 The RV above represents a Random Variable with a Distribution (Bernoulli, Poisson,...

• Replies: 4
• Views: 2,721
BGM
10-25-2012, 01:34 AM
8. ### basic question: random variables

Hello all, I just came across this wonderful forum and was pleasantly surprised by the wealth of information and rich discussion here! I am...

• Replies: 4
• Views: 2,066
02-19-2013, 06:34 PM
9. ### Basic Standard Deviation question

Main information: Studies of the term birth weight (>37 weeks) of babies born in NZ show that the weight of European ethnicity babies is normally...

• Replies: 1
• Views: 1,398
11-17-2012, 12:13 AM
10. ### Basic Statistics

I am sure this is a basic problem that is easily solvable, however, I have not been in a Statistics class in a little over 31 years and have all but...

• Replies: 4
• Views: 1,340
04-27-2017, 05:38 PM

a basketball player has a 40% chance of making a 3 point shot. if the player tries n=12 three pintshots, what is the probability that he makes...

• Replies: 1
• Views: 4,353
02-05-2011, 01:59 AM

Assuming defense has no effect... Team A shoots 100 2pt shots a game, and each shot has a 50% chance of going in. Team B shoots 100 3pt shots a...

• Replies: 1
• Views: 2,224
11-13-2009, 02:09 PM
13. ### Basketball shooting percentage - binomial distribution?

I am interested in studying the probability of team field goal percentage being unusually high. In context, I recently watched a women's college...

• Replies: 3
• Views: 2,458
02-15-2015, 11:59 AM
14. ### Basketball winning streak question

Can anyone please help me figure out how it was concluded that a basketball team with a projected .200% winning percentage has a 47% chance of...

• Replies: 4
• Views: 2,548
11-13-2013, 01:07 PM
15. ### Batting Average & Probability

A softball team's first 4 hitters are Sam (batting average .500), Gina (batting average .400), Tom (batting average .737), and Kerry (batting average...

• Replies: 1
• Views: 5,320
02-26-2008, 01:43 PM
16. ### Battleships Game

Guys, I am struggling to understand how the probability of the Battleships game works. Clearly the variables are a) the area of the grid b) the area...

• Replies: 1
• Views: 1,189
09-02-2012, 10:14 AM
17. ### Baye's Formula Confusion!

Hello, I think I have answered most of this question correctly, but do not quite understand how to find P(D^c|F^c) . The question is as...

• Replies: 3
• Views: 4,831
01-13-2013, 06:49 PM
18. ### Baye's Rule Help

Hello I have this question and I am having trouble figuring it out. Medical case histories indicate that different illnesses may produce...

• Replies: 3
• Views: 4,802
BGM
03-09-2012, 12:43 PM
19. ### Baye's Theorem

Hi, I have two questions that I am struggling with, that concern the Baye's Theorem.... 1) Mr. Smith's gardener is not dependable; the probability...

• Replies: 1
• Views: 6,448
11-13-2006, 05:01 AM
20. ### Baye's Theorem Urn Problem

Hi, I am having some trouble with this problem: Suppose there are 3 urns. You choose one from which you will choose 2 balls from. Urn 1 has 4 red...

• Replies: 5
• Views: 5,356
07-11-2009, 10:44 AM
21. ### Bayes Estimator for Bernoulli/Beta

Let X be number of successes out of n items The prior is a beta distribution. n := 20 a := 5 b := 10 I need to determine the number of...

• Replies: 1
• Views: 2,997
BGM
02-02-2012, 12:51 PM
22. ### bayes for generating new data

I am estimating a tree inventory for a city. I have already measured the heights and identified the species for about 1000 trees in some areas of...

• Replies: 3
• Views: 2,217
03-02-2017, 04:20 AM
23. ### Bayes Probability question

Question: Yearly automobile inspections are required for residents of the state of Pennsylvania. Suppose that 18% of all inspected cars in...

• Replies: 0
• Views: 2,557
10-19-2014, 04:57 AM
24. ### Bayes Problem

A diagnostic test is designed to detect whether subjects have a certain disease. A positive test outcome predicts that a subject has the disease....

• Replies: 2
• Views: 3,877
02-06-2010, 11:08 AM

1. Say we are interested in the effect of a new medication that may help people with an illness. 40% of all people in our population of interest have...

• Replies: 0
• Views: 2,786
09-21-2011, 10:39 AM
26. ### Bayes Rule Problem

Ok, I'm trying to learn Baye's Rule, but I'm very new to it. I understand the rule to say P(A given B) = P(B given A) x P(A) / Assuming that...

• Replies: 1
• Views: 2,741
09-04-2007, 09:33 AM
27. ### Bayes Rule!

Hi, My question is: A company wishes to evaluate the effectiveness of a marketing campaign. Seventy-five percent of all customers using the...

• Replies: 1
• Views: 2,782
01-09-2017, 08:22 PM
28. ### Bayes Theorem

I have been doing some problems with Bayes Theorem, but I have one question that is more complex than the others and was wondering if anyone can help...

• Replies: 1
• Views: 3,110
02-10-2008, 08:29 PM
29. ### Bayes Theorem - JohnM vs my textbook

To JohnM or anyone who knows... I am struggling with positive and negative predictive values (PPV and NPV) homework problems. My textbook...

• Replies: 2
• Views: 2,994
09-10-2006, 08:27 PM
30. ### Bayes Theorem application

Prior probabilities if diseases are based on the physician’s assessment of factors such as geographic location, seasonal influences, and occurrence...

• Replies: 1
• Views: 4,971
08-03-2008, 12:55 PM
31. ### bayes theorem DNA statistics

A crime is committed in an isolated commnity and a single bloodstain is left at the scene of the crime. In this community, 74&#37; of the adult male...

• Replies: 0
• Views: 3,014
04-07-2009, 02:03 PM
32. ### Bayes Theorem Question

Hello all, I have a homework question which I can not figure out: A stock market analyst examined the prospects of the shares of a large number...

• Replies: 1
• Views: 5,214
09-22-2008, 11:42 PM
33. ### Bayes Theorem Question for Probability Newbie

Hi, I'm trying to brush on probability for a graduate class. I've been reading about bayes theorem, which my book states as: P(A | B) = P(B |...

• Replies: 2
• Views: 2,498
09-05-2011, 10:42 AM
34. ### Bayes theory interview question.

This question is a typical interview question at a job I am currently seeking. The reason I am posting it is I have had different answers from...

• Replies: 3
• Views: 7,571
09-12-2012, 08:45 PM
35. ### Bayes thoerem, can you check my solution please?

Hi, I'm terrible at statistics, i hope someone can help. A ship sank into the sea and is now laying in a fixed but uknown position on the bottom...

• Replies: 6
• Views: 2,190
03-05-2012, 12:20 PM
36. ### Bayes' Priors

With a Bayes factor, when specifying priors found in previous studies, I know to use 0 as the mean p(population value given theory) when using a half...

• Replies: 0
• Views: 1,483
11-06-2014, 04:59 AM
37. ### Bayes' Rule with Random Variables

Hello! I'm having so much trouble trying to figure out how to do part (b) of the following problem: The probability that any child in a certain...

• Replies: 0
• Views: 3,427
09-14-2015, 04:53 PM
38. ### Bayes' Theorem

Hi guys, I was hoping somebody might be able to help me with this question. The information I am given: Gamma1 = the risk of disease for...

• Replies: 0
• Views: 2,653
03-20-2008, 07:34 AM
39. ### Bayes' Theorem and Conditional Probability

Hello! So I have a question with regards of a mix of results. I want to change the posterior into a form I know. \mathbb{P}\left( \mu | y,H_1...

• Replies: 2
• Views: 2,614
09-12-2010, 06:35 PM
40. ### Bayes' Theorem and improper priors

Hello! I know Bayes' Theorem applies to both discrete and continuous probability distributions, and also seeing as how, given certain conditions,...

• Replies: 0
• Views: 2,520
08-24-2010, 02:51 PM
41. ### Bayes' Theorem applied to poker?

• Replies: 1
• Views: 1,873
06-01-2014, 11:00 AM
42. ### Bayes' Theory

Hi i'm currently working on a horse race prediction project and trying to include bayes' theory in my project. The thoery is new to me I am trying to...

• Replies: 2
• Views: 4,637
04-19-2010, 03:21 AM
43. ### Bayes's Theorem

Hi! Say there is a deck of 100 cards: Red w/ numbers = 40 Red w/ figures=15 Black w/ numbers=35 Black w/ figures=10 The only information...

• Replies: 4
• Views: 1,606
05-23-2015, 03:22 AM
44. ### bayes's theorem and conditional probability question

chat **** get banged

• Replies: 2
• Views: 1,880
03-23-2016, 01:43 PM
45. ### Bayes, and the Horse He Rode In On

A professor presented this question: "If a cancer screen comes back positive in 68 of 75 cases of actual cancer and in 5 of 191 cases of no cancer,...

• Replies: 2
• Views: 1,911
11-09-2012, 07:15 PM
46. ### bayesian

• Replies: 5
• Views: 3,259
01-16-2009, 12:52 AM
47. ### Bayesian and Probability

A certain disease has infected 2% of the population. The firm has annoucned that 90% of those infected will show a postive test result , while 95% of...

• Replies: 14
• Views: 2,575
03-18-2015, 03:39 PM
48. ### 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: 1,198
05-08-2016, 10:59 AM
49. ### Bayesian conclusion scale with uneven data distribution. Possible?

I have two sets of data distribution between 0 to 100%. I was thinking of using the Bayes theorem of explaining the data distribution. More info on...

• Replies: 4
• Views: 1,878
10-15-2012, 06:11 AM
50. ### Bayesian Convergence

I have to go to bed any minute, so I apologize for the lack of detail provided. I was thinking about repeated testing and how probabilities...

• Replies: 7
• Views: 1,789
05-13-2015, 03:26 AM
51. ### Bayesian exercise

-2 down vote favorite I cant get my head round the following exercise: You are testing dice for a casino to make sure that sixes do not come up...

• Replies: 5
• Views: 3,178
01-18-2017, 01:56 PM
52. ### 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: 1,199
01-23-2016, 10:44 AM
53. ### Bayesian inference

Hello, I am having trouble understanding Bayesian inference (all those parameters, data, prior/posterior distributions). It's all a little bit...

• Replies: 0
• Views: 2,180
05-31-2012, 03:07 PM
54. ### Bayesian inference - or maybe i'm doing that wrong?

So first of all - hello! Now, my problem: So I started baye's theorem, and tutor said, that mostly i will need that formula: In denominator...

• Replies: 3
• Views: 2,512
09-10-2011, 10:54 AM
55. ### Bayesian inference -(unknown mean and variance | and a proof)

hello, i take a bayes lesson. there are 3 questions as my homework, i did one of them. i am new to statistics, so instructor said i can get help as...

• Replies: 4
• Views: 5,098
10-22-2010, 05:07 PM
56. ### Bayesian kills me

I have been practicing this Bayesian thing as you can tell.. so here I have made another attempt to get my concepts clear, If the pre-test...

• Replies: 11
• Views: 3,897
09-23-2010, 12:54 AM
57. ### Bayesian posterior

Hi I am trying to put together a Bayes posterior distribution. I must have made a mistake because I am not able to manipulate the variables into...

• Replies: 0
• Views: 2,389
04-20-2009, 08:39 AM
58. ### Bayesian prediction interval

• Replies: 8
• Views: 2,773
08-14-2013, 09:37 AM

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