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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: 30,345
09-30-2005, 09:44 AM
1. ### Almost sure convergence

Let Y_n be a simple symmetric random walk on the integers Z, starting in state 0. Define X_n to be 1 if Y_n=0 and 0 otherwise. I have already...

• Replies: 1
• Views: 4,306
11-22-2009, 11:05 AM
2. ### Var(X) where X = 0 80% of the time and X ~ Uniform(1,b) 20% of the time

Suppose X: S --> is a continuous random var defined on sample space S with pdf = Pr(X = 0) = 0.8 Pr(X) = (1-p(0))/(b - a) = 0.2/10 for all X...

• Replies: 1
• Views: 3,031
BGM
11-22-2009, 08:03 AM
3. ### Normal approximation and also a problem with hypothesis testing

I need a little help with the formulas here. I’m not sure if I am doing this right. Records show that 29% of all payments to a mail-order company...

• Replies: 0
• Views: 5,770
11-21-2009, 09:47 PM
4. ### law of total expectation (VECTOR case)

" The law of total expectation is: E(Y) = E. It can be generalized to the vector case: E(Y) = E. Further extension: (i) E(Y|X1) = E (ii)...

• Replies: 4
• Views: 5,612
11-21-2009, 12:35 PM
5. ### expected value and variance derivation (kernel)

Hi there, I am studying kernel smoothing from the book of Mand. I will appreciate any help because I am stuck all day. (p15) I am stuck at the...

• Replies: 0
• Views: 4,254
11-20-2009, 04:59 PM
6. ### find the expected value of continuous random vaiable

Hi, To find the expected value of a continous random variable I normally integrate the pdf multiplied by the random variable over the range of the...

• Replies: 10
• Views: 14,177
11-20-2009, 07:05 AM
7. ### Should I be using Conditional probability here?

Hi, Last Friday - which was the 13th - I gave myself this problem: Find the probabilty of a day being FRIDAY the 13th I used the following...

• Replies: 0
• Views: 2,166
11-19-2009, 10:58 AM
8. ### Probability Questions help please

The finishing process on new furniture leaves slight blemishes. The table shown below displays a manager’s probability assessment of the number of...

• Replies: 2
• Views: 5,634
11-18-2009, 09:37 PM
9. ### Law of Total Expectation

The law of total expectation states that: E(X) = E and E = Eg(X)|Y)] 1) Now, is it correct to say that E(XY)=EXY|Y)] ? I don't think the above...

• Replies: 10
• Views: 12,806
11-18-2009, 02:28 AM
10. ### Conditioning on Random Variables?

Let T be a constant, and let N be a random variable. Suppose {X_1,X_2,...} are independent, and each X_i follows continuous uniform(0,T)...

• Replies: 5
• Views: 3,361
11-17-2009, 10:50 PM

a fair six sided die is rolled 5 times and the number of 6's are counted. find n and p. Find the probability of exactly two 6's. I know that n=5...

• Replies: 2
• Views: 3,617
11-17-2009, 09:49 PM
12. ### statistics problem dealing with minimum occurrences

Don cherry says on average of 4 outrageous things per week. Don mclean claims that cherry rarely says fewer than 16 outrageous things per week. If...

• Replies: 0
• Views: 1,803
11-17-2009, 02:07 AM
13. ### probability problem help!

X and Y are independent with a common distribution... f(x) = 1 if 0 less than or equal to x less than or equal to 1 f(x) = 0 elsewhere a....

• Replies: 1
• Views: 2,048
11-16-2009, 10:33 PM
14. ### loss probabilities

trying to figure out this problem: insurance company estimates of loss probabilities for the next year. \$500 deductible. Total loss: 0.001 50%...

• Replies: 1
• Views: 2,571
11-15-2009, 11:21 PM
15. ### Exponential Distribution

I am having trouble with this question. In my notes from class and the texbook i can only find examples/equations for if P(x>k) or P(x<k). Would I...

• Replies: 1
• Views: 6,258
11-15-2009, 10:27 PM
16. ### Deconvolution of gamma distribution

Notation: g(x,a,b) is the gamma distribution with shape a and scale b. The distribution g(x,1,1) is the standard exponential distribution. ...

• Replies: 0
• Views: 3,652
11-15-2009, 09:58 AM
17. ### Help with conditional probabilty

I've been struggling for a good couple hours on the below, and I was hoping someone might be able to push me in the right direction... "A"...

• Replies: 2
• Views: 2,687
11-14-2009, 03:55 PM
18. ### Probablity Challenge

can anyone solve this??? Assume 2 gamblers, Max and John, bet \$1 on successive tosses of a fair coin, and each has \$6 to start with. a) what is...

• Replies: 3
• Views: 4,431
11-13-2009, 04:13 PM

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: 2,219
11-13-2009, 02:09 PM
20. ### Probability Distributions

Hi all, I've got a question here, and i'm not sure if it's how it's written or what, but I'm not quite getting it. Consider an insurance policy...

• Replies: 1
• Views: 4,576
11-12-2009, 08:11 PM
21. ### Moved:Histogram Question

This is a follow up to my other post here. I have decided to put the data into a histogram for myself. I weighted the days of the week with how...

• Replies: 1
• Views: 2,550
11-12-2009, 04:39 PM
22. ### problem about almost sure and L1 convergence

• Replies: 0
• Views: 2,690
11-11-2009, 02:41 PM
23. ### Question Normal Distribution

Question: A person mustswcore in the upper 2% of the population on an IQ test to qualify for membership in Mensa. If IQ scores are normally...

• Replies: 1
• Views: 2,681
11-11-2009, 01:13 PM
24. ### Probability Question

Once again can someone please help me start and point me in the right direction to help solve this problem. A university found that 20% of its...

• Replies: 1
• Views: 3,420
11-11-2009, 12:59 PM

A machine fills containers with a particular product. The standard deviation of fillign weights is known from past data to be .6 once. if only 2% of...

• Replies: 1
• Views: 5,713
11-11-2009, 11:27 AM
26. ### stupid probability question

Hi there, Here is a stupid question, am I doing something wrong, the result just don't seem right to me. Let X,Y continuous random variables...

• Replies: 1
• Views: 3,426
11-10-2009, 03:25 AM
27. ### Simple birth-death process

Hello, I am working on a simple birth-death process problem, I have been asked to find the distribution function for the extinction time T. So T...

• Replies: 0
• Views: 4,199
11-08-2009, 05:27 AM
28. ### Probability WTF??

I am really having trouble with this problem. I need to know what the probability is if a number lies between two numbers. Using the Z-score table. ...

• Replies: 2
• Views: 3,080
11-04-2009, 08:18 PM
29. ### Probability

Approximately 23% of Canadians aged 25-64 have a university degree (and many more have some other form of post-secondary education, such as a college...

• Replies: 3
• Views: 2,511
11-04-2009, 07:03 PM
30. ### Confidence Intervals

A survey of 64 random sports viewers revealed that 32 of them watched the football game. Construct a 99% confidence interval estimate for the true...

• Replies: 1
• Views: 2,698
11-02-2009, 08:19 PM
31. ### Identify values for Binom Dist prob

This is my problem; A city law enforcement official has stated that 20% of the items sold by pawn shops within the city have been stolen. Ralph has...

• Replies: 1
• Views: 2,346
11-02-2009, 05:40 PM
32. ### problem with a Combination rule word problem

I am having a little trouble finding the answer to this word problem If you drew three cards form a standard deck without replacement, what would...

• Replies: 1
• Views: 6,712
11-02-2009, 02:13 PM
33. ### Probability Question Involving a Cumulative Total

Hello, I am working on a probability formula for Open Office Calc that needs to determine the following, given: Events: A.) eight 30&#37; chance of...

• Replies: 0
• Views: 3,355
11-01-2009, 07:13 PM
34. ### conditional probability problem

Here's the question: The voters in a large city are 50% white, 40% black, and 10% Hispanic. Candidate Smith wins 40% of the white vote, 80% of...

• Replies: 2
• Views: 4,532
11-01-2009, 05:32 PM
35. ### Kurtosis and Skewness Risk

Hi I was wondering if anyone knew how to adjust for non-zero skewness and kurtosis so that the standard deviation measure becomes an adequate...

• Replies: 0
• Views: 4,848
10-31-2009, 08:31 PM
36. ### Is it binomial probability?

Affirmative action commitments by industrial organizations have led to an increase in the number of women in executive positions. Satellite Office...

• Replies: 1
• Views: 11,786
10-30-2009, 08:36 PM
37. ### About the definition of probability

We know the measurable space of probability is a continuous space of . Then, if a random measure is valued (or defined) on the continuous space , is...

• Replies: 2
• Views: 2,852
10-29-2009, 03:41 PM
38. ### confused by normal distributions with variance smaller than 1

Hello, I am currently working with some normal distributions, and got confused by some specific situation where the density function does not look...

• Replies: 5
• Views: 6,727
10-29-2009, 05:30 AM
39. ### Is a subset of a normal distribution normal?

An easy one for some of you guys here I suspect. Thanks to anyone who can help me with it. I have an application which adds a normally...

• Replies: 4
• Views: 10,349
10-29-2009, 03:54 AM
40. ### joint pdf question

I'm not quite sure if I'm approaching this question right... If the joint probability density of X and Y is given by f(x, y) = 24y(1 - x - y)...

• Replies: 1
• Views: 6,596
10-28-2009, 09:30 PM

fx(x) = k(1-x^2) on (-1,1) find k, and P(lXl>1/2)

• Replies: 1
• Views: 2,774
10-28-2009, 07:59 PM
42. ### This probability problem is all over the internet...

This seems to be a common statistics homework question, as it is all over the internet. Because of this, I know the answer (0.2904), but that is not...

• Replies: 3
• Views: 17,280
10-28-2009, 05:02 PM
43. ### exponential distribution probability help

This is a modified version of one of my homework questions. Please help me out, and show your work so I know how to calculate it myself. The only...

• Replies: 3
• Views: 5,192
10-26-2009, 11:21 PM
44. ### Somebody help me please :(

I am unsure how to do this problem. Can somebody please help me. I was shown on my TI-83 how to do problems similar, (binobpdf) so I don't know if I...

• Replies: 1
• Views: 6,942
10-26-2009, 11:39 AM
45. ### Poisson Counting Process

• Replies: 1
• Views: 3,051
10-25-2009, 08:24 PM
46. ### Joint Density Function Help!

For some reason I lost all of my mathematical abilities on this one.

• Replies: 1
• Views: 3,771
10-25-2009, 08:09 PM
47. ### Pollutants in auto exhausts.

Hello all - I am in need of some assistance with a probability problem. I am thoroughly confused and I don't know what to do. Any help is...

• Replies: 2
• Views: 16,534
10-25-2009, 11:26 AM
48. ### Normal approximation to the Binomial probability

Having a hard time figuring this out... can someone help me? Suppose that there is a 1 in 10000 (0.0001) chance that a randomly chosen star is...

• Replies: 1
• Views: 4,355
10-23-2009, 01:26 PM
49. ### Discrete distribution

need help! You are interested in investing in sub-prime mortgages. Suppose that there is a 25&#37; chance that a subprime mortgage defaults. If the...

• Replies: 1
• Views: 2,505
10-23-2009, 01:15 PM
50. ### Magician

A magician has cards 1-10 and a person picks two numbers. What is the probability that Sebastian will correctly name the 2 cards, if he is just...

• Replies: 1
• Views: 1,756
BGM
10-23-2009, 10:31 AM
51. ### 3 Norm Dists (correlated), prob co-occurence of 1% right tail

Hi, hoping someone can lead me in the right direction.. I'm looking at three normal distributions, specifically looking at the 1% extreme in each...

• Replies: 2
• Views: 2,303
10-21-2009, 05:15 PM
52. ### Cant figure out this question

What are moments?

• Replies: 0
• Views: 2,310
10-20-2009, 11:39 PM
53. ### Need Help on Gamma Probability Distribution Question

What is moments if you are solving for m(0)?

• Replies: 0
• Views: 3,215
10-20-2009, 11:27 PM
54. ### Can't figure out probability question...

Ok, so I'm completely lost in my Statistics class and I really need help on this problem. I think if I figure this one out, it will help with the...

• Replies: 1
• Views: 14,208
10-20-2009, 10:52 AM
55. ### Probability! HELP!

for the fiscal year 2007, a tax authority audited 1.53% of individual tax returns with income of 100,000 or more. What is the probability that two...

• Replies: 1
• Views: 2,582
10-20-2009, 10:47 AM
56. ### Poisson counting process problem (not easy)

• Replies: 7
• Views: 3,657
10-18-2009, 10:32 PM
57. ### basic probability questions (pictures inside) Help!

i wish i could say i knew somewhat of where to start for these problems but i dont. My teacher is not the best and the homeworks are always...

• Replies: 1
• Views: 3,859
10-16-2009, 12:07 PM
58. ### Quick Question

Hello to all, I was directed here by my older brother for help with some questions because he's currently away at school (or just sleeping). So...

• Replies: 2
• Views: 3,704
10-16-2009, 08:58 AM

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