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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: 30,333
09-30-2005, 09:44 AM
1. ### Sensitivity and specificity calculation seems too low.

Hi, Just working through this sensitivity and specificity problem and the answer I obtain seems incredibly low. Might one show where my error is?...

• Replies: 4
• Views: 1,870
12-07-2012, 10:02 AM
2. ### How do I figure out the E[X]?

Consider a game called “Money Bags”. The game consists of drawing from a bag filled with (25) twenty five chips with different values: • (1) One...

• Replies: 1
• Views: 2,610
12-07-2012, 03:40 AM
3. ### Calculating moment generation function: Set up correctly, need help with integral!

Hi, I’ve reached a dead end in calculating this moment generating function. f(x) = 2e^{2-2x}, x > 1 ...

• Replies: 1
• Views: 1,468
12-05-2012, 11:16 PM

Hey everyone! let me first say this forum has been a great help to me. I'm having trouble with this question. I have the answer but I'm not...

• Replies: 2
• Views: 1,635
12-05-2012, 09:37 PM
5. ### Find distribution function of Y given density function of X and Y as a function of X.

Hello! Let X have the density function f(x)=2x, 0 < x < 1 and Y = 2X + 1 Find the distribution function of Y, F_Y . I solved X =...

• Replies: 7
• Views: 2,951
BGM
12-05-2012, 01:20 PM
6. ### Joint distributions

Don't suppose anyone can help me with this question? Suppose that birds have each time a random number X of eggs uniformly distributed in...

• Replies: 1
• Views: 1,737
BGM
12-05-2012, 09:03 AM
7. ### Answer to Simple Prob Assignment

This problem concerns MGB Problem 1 of Chapter 1: "One urn contains one black ball and one gold ball. A second urn contains one white and one gold...

• Replies: 3
• Views: 2,560
BGM
12-05-2012, 07:27 AM
8. ### Probability of waiting time

Hi, I am trying to solve these problems. I did the first one correctly, but when I do the others in a similar fashion, I get the incorrect answer....

• Replies: 1
• Views: 1,499
BGM
12-05-2012, 02:58 AM
9. ### Find P.D.F of U and V.

Hey, I have this problem for a review sheet and am not completely sure how to proceed. The joint density function of X nd Y is given by ...

• Replies: 4
• Views: 2,795
12-04-2012, 09:28 PM
10. ### Q-Q plot equivalent for discrete variable?

Hello, You can use a Q-Q plot to visually test if 2 continuous variables are from the same distribution and you get a straight line. Is there...

• Replies: 0
• Views: 2,351
12-04-2012, 08:05 AM
11. ### Same grade assigned by 3 Professors - highly subjective assessment (M.Sc. interview)

UPDATE: sorry, there is a name for the issue, "Inter-rater reliability" of which I was unaware of. I found it in a book by Hughes, A., Testing for...

• Replies: 0
• Views: 1,328
12-01-2012, 03:48 PM
12. ### Probability of demand?

Hi all, demand table is given below(Note: Period is 12 years). So according to the data, I understand that the yearly demand will be between...

• Replies: 3
• Views: 2,629
11-30-2012, 11:01 PM
13. ### Probability/chance question

CREA puts the average price at which a house was sold in Canada in 2010 at \$339,100. Let us assume that the standard deviation of the house prices is...

• Replies: 2
• Views: 2,779
11-30-2012, 08:59 PM
14. ### 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: 3,592
11-29-2012, 01:15 PM
15. ### Defining a problem with random variables.

I am studying the following problem. Take n random normal distributions each with a common standard deviation of s. Call these d(1), d(2)...d(n)....

• Replies: 0
• Views: 1,776
11-29-2012, 12:24 PM
16. ### Roulette probability

I am really struggling with this.... any help will be greatly appreciated Consider the following three methods of betting reds on a roulette...

• Replies: 1
• Views: 1,935
11-28-2012, 09:08 PM
17. ### chances of going first in.. pokemon??!

ha did the title draw you in? good, cause this is a tricky one. you don't need to know much of anything about Pokemon cards to solve this problem. ...

• Replies: 3
• Views: 1,857
11-28-2012, 05:46 PM
18. ### Tax question help!

When the BC Government introduced a carbon tax in 2008, it did not want to lose votes as might easily happen with a new tax. They therefore...

• Replies: 1
• Views: 1,576
11-28-2012, 04:38 PM
19. ### Duplicate sample probability

I have a population of N unique items, and I take n random samples (with replacement, so some items may be sampled more than once). If I then take...

• Replies: 8
• Views: 4,483
11-28-2012, 07:37 AM

Hi, I tried to solve this question, but i could not understand it .If you know how to solve it, i will appreciate your help. Here is the...

• Replies: 1
• Views: 1,653
11-27-2012, 11:30 PM
21. ### Simple but convoluted probability help

For my assignment, I'm working on producing a predictive model of probability based on "historic performance", for want of a better description. I...

• Replies: 3
• Views: 1,706
11-27-2012, 10:10 AM
22. ### Normal Approximation probability question

Consider a four-sided die loaded so that 1 shows 40% of the time. If we roll this die 50,1000,2000,4000,8000 times, find the probability in each...

• Replies: 1
• Views: 2,137
BGM
11-27-2012, 02:52 AM
23. ### Markov chain: probability of visiting all states before absorption

Hi all, I have the following Markov chain \begin{tabular}{cccc} 0 &0.5 &0 &0.5\\ 0.5 &0 &0.5 &0\\ 0 &0 ...

• Replies: 1
• Views: 2,640
BGM
11-26-2012, 01:45 PM
24. ### Sampling Distributions help

Hi, I'm teaching myself stats but have no idea on how to solve these, any help would be appreciated. When a pizza restaurant’s delivery process is...

• Replies: 12
• Views: 1,736
11-26-2012, 11:07 AM
25. ### probability of control with and withour replacement

The control desk for a spare part examines a sample of 5 units of each batch and reject if it finds more than 2 defective. A vendor delivers a...

• Replies: 2
• Views: 1,068
11-26-2012, 09:38 AM
26. ### I'm confused on probability density functions - please help!!

These questions are from a sample test, I don't know how to do them. Obviously there's a lot of questions so I'm not expecting people to do them for...

• Replies: 1
• Views: 1,796
BGM
11-26-2012, 05:01 AM
27. ### Normal Approximation question

1) A fair coin is tossed 600 times. What is the probability that the number of heads will be between 290 and 310? (I have the answer, but I need...

• Replies: 1
• Views: 1,203
BGM
11-26-2012, 04:01 AM
28. ### Continuous distribution function

I have a problem (actually two of them) where i am confused on what it requires. It states: Y is a continuous random variable on the interval...

• Replies: 1
• Views: 1,139
BGM
11-25-2012, 02:51 PM
29. ### Help with probability, sample mean & standard deviation

Can anyone help me on how to do this problem? I'm so confused

• Replies: 1
• Views: 1,419
11-24-2012, 04:47 AM
30. ### Markov chain hitting time

Hi, I am trying to compute the hitting time of Markov chain. The way I formulated the problem is, what is the time to to hit state j (j in E) for...

• Replies: 2
• Views: 1,557
11-24-2012, 04:14 AM
31. ### 1 out 101

Hi, I am hoping that someone can help me out with this? If I have 54 numbers on a roulette table, and there is a random generator picking the...

• Replies: 2
• Views: 1,394
11-23-2012, 05:28 AM
32. ### Variance of Marginal effects

I am trying to find Var(β3+xβ4+xβ5) where the x's are ages (20,30,40,50,55) The Marginal Function is: 14.09616 - 0.47037AGE + 0.0042AGE^2 I just...

• Replies: 4
• Views: 2,737
11-22-2012, 11:17 PM
33. ### What is the probability for the second half of the question posted?

I ran into this blog posting about russian roulette http://bayesianthink.blogspot.com/2012/11/winning-at-russian-roulette.html Curious to know...

• Replies: 1
• Views: 1,165
BGM
11-22-2012, 05:33 PM
34. ### how to compare different normal distributions: chance of winning in a popular game

A, B, C, and D play a game, in which scores follow a normal distribution A's mean score is 34 (sd 3), B mean 33 (sd 3.5), C mean 32 (sd 4), D mean...

• Replies: 9
• Views: 2,168
11-22-2012, 05:09 PM
35. ### Standard Deviation and Mean

The question is: In order to test a theory about the development of a disease, suppose that we have to nd patients with Blood Group B, which...

• Replies: 2
• Views: 1,429
11-22-2012, 12:54 PM
36. ### simple random walk

Hi all, I've a question for u... the mathematical model that explains the experiment of tossing a fair coin is the simple random walk,...

• Replies: 1
• Views: 872
BGM
11-21-2012, 11:37 AM
37. ### How do you solve this probability question?

Suppose you wish to estimate the difference between the mean acidity for rainfalls at two different locations, one in a relatively unpolluted area...

• Replies: 1
• Views: 3,302
11-19-2012, 09:29 PM
38. ### Regresssion to the mean + independant events = confusion

From my limited understanding of probability, I see fair coin tosses to be independent events. Each time I flip a fair coin the odds are 50% for...

• Replies: 2
• Views: 1,182
BGM
11-19-2012, 05:04 PM
39. ### Continuous probability problem

Hello I have a probability problem, which I have solved, but I am not sure. I have a circle with radius r. I want to know what is the...

• Replies: 4
• Views: 1,113
11-19-2012, 04:09 PM
40. ### Question About example in Probability!

The waiter in charge of the Mechelsestraat pizzeria systematically under-reports the amount of tips he receives from customers: in fact, for every n...

• Replies: 2
• Views: 1,007
11-19-2012, 12:25 PM
41. ### probability of damaging vs. fixing a device by random operations

Hello all, It is obviously easier to damage than to fix a device. But how can I express these two different probabilities by random operation? ...

• Replies: 0
• Views: 1,060
11-18-2012, 02:20 AM
42. ### Covariance question without using integrals

Hello, I am trying to figure out a way to do the following question without using integrals. X is distributed as Unif with Y=-log(X). Find...

• Replies: 4
• Views: 2,457
11-18-2012, 01:51 AM
43. ### Probability hw!

I really really need some help! A federal agent is deciding which of the two waste dump projects to investigate. A top administrator estimates that...

• Replies: 1
• Views: 1,091
11-17-2012, 04:41 PM
44. ### 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: 1,396
11-17-2012, 12:13 AM
45. ### Odds of a certain 5 character string occurring in a random string of 512.

I work in security and recently had a false positive happen where a certain word that was being tested occurred in the session id. Matching is not...

• Replies: 13
• Views: 2,986
11-16-2012, 09:51 PM
46. ### Not sure of the limits of integration in this problem!

Hi, The question is as follows: If X and Y are independent and f(x) = 1/2 when 0<X<2 and f(y) = 2Y when 0<Y<1, find P(X<2Y). My attempt: ...

• Replies: 3
• Views: 1,391
11-16-2012, 12:26 PM
47. ### Combining standard deviation/normal distribution (do I have this right?)

I have a variable with a mean of 52% and a standard deviation of 2.5%. However, the 52% mean was derived from an opinion poll which itself has a 3%...

• Replies: 0
• Views: 1,429
11-16-2012, 11:28 AM
48. ### Probability of journey times

Hello, If you assume that the average speed of car will be 30km/hr when making a journey. A journey distance is 10 km. You therefore...

• Replies: 3
• Views: 1,661
11-16-2012, 11:17 AM
49. ### What are our chances of winning the prize draw?!

Hi, I have a problem that we are having trouble solving There are 3000 entries that are put into a prize draw. Our team has 30 of those...

• Replies: 1
• Views: 1,248
BGM
11-16-2012, 07:17 AM
50. ### Conditional Probability Questions

Hey guys, pretty simple question here (for yall I hope).... I'm trying to calculate a conditional probability, but I'm drawing the probabilities...

• Replies: 2
• Views: 1,480
11-15-2012, 09:40 PM
51. ### Pseudo-observations

Hi, I need help in understand what pseudo-observations actually are, (what transformation have they taken) and I need to know about the...

• Replies: 0
• Views: 2,880
11-15-2012, 09:07 AM
52. ### Interpret odds ratio between 0 and 1 in plain english

Dear all, I am looking to the relationship between a credit rating downgrade (for example from AA- to A+) and Acquisitions. my independent...

• Replies: 2
• Views: 3,824
11-15-2012, 07:04 AM
53. ### help with a problem

If P(AUB)=.76 and P(AUB')=.87 Find P(A). I have tried to work this problem and got an answer of .065 but the proper one is .063. Can someone please...

• Replies: 1
• Views: 2,263
BGM
11-15-2012, 02:36 AM
54. ### Hypergeometric distribution shortcut?

Hello, First of all, I am not taking a class on probability. I have been studying it on my own due to its relevance in certain areas of personal...

• Replies: 2
• Views: 1,811
11-13-2012, 10:56 AM
55. ### General Probability Question

Hi, I was wondering why one of the solutions to my answers says P(t>=2) = 1-P(t<=1), and another solution for a different problem says...

• Replies: 6
• Views: 1,164
11-13-2012, 12:05 AM
56. ### Probability Brain Teaser

You have 6 pairs of socks - 2 white, 2 black, 2 green You need a matching pair in either white or black - but the lights are out, so you have to...

• Replies: 3
• Views: 1,457
11-12-2012, 10:00 PM
57. ### Proving of probability

Hello! I'm new to this site, so I hope this is the right category to post my question. So here's the deal: in class we get almost only theory, very...

• Replies: 4
• Views: 1,466
11-12-2012, 04:25 PM
58. ### Help with probablility distribution.

Probability 1.* Suppose that the mean of the annual return for common stocks from 1950 to 2012 was 10.4%, and the standard deviation of the annual...

• Replies: 1
• Views: 1,809
BGM
11-12-2012, 03:39 PM

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