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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: 30,249
09-30-2005, 09:44 AM
1. ### Weighted Die

Hello I have a question about weighted die and binomal distribution the question goes like this Someone rolls one die 5 times. The die is...

• Replies: 3
• Views: 5,645
BGM
02-13-2011, 03:25 PM
2. ### count of integers in sliding window

Hi all, I'm looking to generate a series of integers in the range , that start off with a large spacing, like 2 50 101, etc. At a peak of some...

• Replies: 11
• Views: 5,643
02-26-2010, 06:29 AM
3. ### Probability Question Needed to be Answered

A youth group has eight boys and six girls. If a state of four officers is selected, find the probability that... a.) Three are girls? b.) Two...

• Replies: 1
• Views: 5,639
03-11-2008, 05:49 PM
4. ### method of moments and MLE question

Hello all, I have a question regarding a problem asking to obtain an estimator for theta using MLE and method of moments and then to compute the...

• Replies: 7
• Views: 5,626
10-29-2011, 08:48 PM
5. ### Binomial/geometric distributions

Which of the following are true statements? I. The histogram of a binomial distribution with p=0.5 is always symmetric II. The histogram of a...

• Replies: 6
• Views: 5,623
BGM
03-07-2011, 03:21 AM
6. ### Normal distribution problems

I'm having some issues with a few questions on my practice final. Let X be a normally distributed random variable with expectation = -1 and...

• Replies: 15
• Views: 5,608
12-20-2010, 02:38 PM
7. ### roulette probability questions

PLEASE HELP ME ASAP WITH THIS PRBLEM!!! In the game of roulette, the probability of winning when the betting on a color is 0.474. Assume the game...

• Replies: 1
• Views: 5,603
07-19-2006, 09:17 AM
8. ### Confidence interval, pls help

Hi could i pls get some help with these questions. I dont want the answer. I would be greatful if someone could even tell me what formula i would...

• Replies: 2
• Views: 5,602
11-21-2006, 04:04 PM
9. ### 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: 5,602
11-18-2009, 09:37 PM
10. ### Maximum Likelihood Estimator question with binomial distribution

Q. Lifetimes of components are Gamma distributed. The parameters of the Gamma are shape = a scale = λ The pdf is: f(x) =...

• Replies: 3
• Views: 5,583
BGM
03-06-2011, 01:21 PM
11. ### 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: 5,582
11-21-2009, 12:35 PM
12. ### Sampling distribution of the proportion

I have a fairly simple question about a specific step within this problem. "The probability is 90% that the sample percentage is contained within...

• Replies: 2
• Views: 5,578
07-23-2011, 08:02 PM
13. ### MGF Standard Normal to Normal

Hi, I'm just doing some review problems and I've found the MGF of a standard normal random variable, X ~ N(0,1). After some tedious algebra, I...

• Replies: 3
• Views: 5,577
11-25-2010, 12:40 AM
14. ### Multivariate conditional probability

Hello all, I'm having a difficult time finding an equation that will give me the conditional probability of a specific scenario occurring. To...

• Replies: 6
• Views: 5,572
01-04-2011, 11:16 AM
15. ### Pick 3 items, probability that A<B<C

This question has been bugging me the last 24 hours or so, hopefully someone here can break it down for me. Say you have N number of items that...

• Replies: 3
• Views: 5,564
06-25-2010, 03:52 PM
16. ### help with 2 r.v. normal distribution problem

Hi all, so my question has to do with 2 r.v. and normal distribution. X: mean = 5000, standard deviation = 100 Y: mean = 5200, standard...

• Replies: 8
• Views: 5,562
04-06-2010, 08:54 PM
17. ### Expected value of Yi^2

Yi is i.i.d. N(0,σ^2) for i=1 to n. E=0, var=σ^2 Show that E = 1 if E = 0, how does the the sum of squared Yi's equal 1?

• Replies: 3
• Views: 5,560
BGM
10-16-2011, 11:48 PM

This is one concept I cannot understand. I'm studying for a test and loathe the probability chapter. Here is the problem and I following all of the...

• Replies: 12
• Views: 5,559
04-15-2012, 06:45 AM
19. ### Settle an Argument

A social club has a daily contest where they draw a name from a list of all of the club members. A name is drawn each day. In order to win, you must...

• Replies: 19
• Views: 5,552
07-27-2010, 07:22 PM
20. ### Normal Distribution Problem

Hello everyone, I am stuck on some problems involving normal distribution. Any help would be GREATLY appreciated. Unfortunately, this is for an...

• Replies: 1
• Views: 5,535
04-05-2013, 03:20 PM
21. ### Finding P(X-Y=0)

Hi, I have several distributions which I want to compare. They include the Burr distribution, Johnson SB, logistic and a few others. They are all...

• Replies: 2
• Views: 5,534
01-27-2012, 04:25 PM
22. ### Expected value of second highest draw

Hello all, Suppose I take two draws from a uniform distribution on . I know that the value of the highest draw is equal to x. What then is the...

• Replies: 1
• Views: 5,518
BGM
11-28-2010, 02:01 PM
23. ### normal distribution problem

Question..?? I cant seem to get this right. Do I find the z-score then do the problem or... please help.. question The life span of oil-drilling...

• Replies: 4
• Views: 5,517
03-01-2009, 11:28 AM
24. ### type 2 error probability

Hi, I need help calculating the type 2 error probablity A Harris poll was taken to determine which of 13 major industries are doing a good job...

• Replies: 0
• Views: 5,516
04-08-2011, 01:49 AM
25. ### Conditional Probability Venn Diagram

I am having a very difficult time trying to determine how they got the probabilities shown in the Venn Diagram from the above information. I'm...

• Replies: 3
• Views: 5,515
BGM
10-17-2011, 03:09 AM
26. ### Probability problem and 2 others

Ok I have 3 problems and I cant figure them out :mad: its driving me crazy. 1. The number of calls coming into a PBX follows a Poisson process...

• Replies: 5
• Views: 5,513
04-19-2007, 05:31 PM
27. ### Need help in finding the probability of events occuring?

Question: i have a total of 16 events whereby the probability of 2 events occuring is 0.3, the probability of 6 events occuring is 0.003 and the...

• Replies: 6
• Views: 5,513
07-20-2008, 01:38 AM
28. ### uniform distribution

Assume that the weight loss for the first month of a diet program varies between 6 pounds and 12 pounds, and is spread evenly over the range of...

• Replies: 0
• Views: 5,513
05-14-2009, 05:09 AM

I cannot figure out this problem for the life of me. Can someone please help me. I have the answer. .58. However, I cannot figure out the solution. I...

• Replies: 2
• Views: 5,512
12-05-2009, 02:05 AM

Robert is a

• Replies: 23
• Views: 5,496
11-06-2008, 06:03 PM
31. ### Need Help, how to interpret the goodness of fit, bivariate probit model

I ran proc qlim in SAS, bivariate probit model, but dont know how to interpret the results. Could anyone please help me out of this problem.... ...

• Replies: 0
• Views: 5,496
03-04-2009, 04:01 AM
32. ### Expected Value of (1/N)

Someone rolls a pair of dice repeatedly until the first time a sum of eleven shows. Let N be the number of rolls required. Find E(1/N). So N is a...

• Replies: 2
• Views: 5,493
BGM
05-10-2011, 04:26 AM
33. ### 99% Confidence Interval

Hi Guys, I'm stuck and need a little help on this one. I have calculated mean: 74.40 and Std Dev: 12.251 from Population 262, Sample 103. I...

• Replies: 3
• Views: 5,490
01-23-2011, 05:15 PM
34. ### Calculating probability given mean and standard deviation

Hi I have looked around for this post on the forum but could not find one and have spent a while attempting this question: Given that X is...

• Replies: 0
• Views: 5,480
10-28-2012, 09:43 AM
35. ### Simple probability question. Involves drawing name for gift.

We had a dinner with my family where we draw names to give gift this christmas. The only rule was to not pick our name. We did it a couple of time...

• Replies: 4
• Views: 5,478
10-14-2009, 10:08 PM
36. ### z standard normal

First part of the question asks..if X is normal with mean = 8.48 and sd = 1.6, what are the 2 values of X which include central 80% of probability? ...

• Replies: 1
• Views: 5,471
04-11-2008, 07:18 AM
37. ### Number of bit combinations

Hi, Here's a simple question (sorry, this is probably probability 101, but I am no statistician!) I know that I can make up 2^n different...

• Replies: 3
• Views: 5,469
07-01-2009, 08:12 AM
38. ### Weighted coin probability

The problem: A coin is weighted to show heads 60% of the time. How many coin tosses are needed to have 90% confidence of getting more heads than...

• Replies: 5
• Views: 5,469
BGM
06-06-2011, 03:18 PM
39. ### Can't seem to solve this p(x+y>1)

Given f(x,y) = 3x/2 for 0<x<1 , -x<y<x Find P(x+y>1) .

• Replies: 15
• Views: 5,462
04-01-2012, 07:13 PM
40. ### Interpretation of ratios Cp

Hi to everyone!! I have solved one exercise in statistics and I have a problem in the interpretation of these ratios: I calculated the following for...

• Replies: 3
• Views: 5,459
02-25-2010, 08:27 PM
41. ### PDF and E(Y)

Hi All, I'm going through revision questions, and I am stuck on this particular section all with similar questions. If somebody can give me a guide...

• Replies: 8
• Views: 5,457
05-14-2008, 07:03 AM
42. ### Binomialdistribution

The question is as follows: In a carnival game, a person can win a prize by guessing which one of 5 identical boxes contains the prize. After each...

• Replies: 0
• Views: 5,456
10-24-2006, 12:27 PM
43. ### p-value of empirical distribution

I obtained an empirical distribution (with simulation) of a specific measure - I have 1000 values. Now I want to do right tail test. How do I get...

• Replies: 0
• Views: 5,450
04-17-2010, 03:31 PM
44. ### Binomial Distribution / Consecutive Odds Question

Hi everyone, Looking to solve a 3 part problem. My answers to the first 2 parts agrees with the textbook answers, but I'm confused by the 3rd...

• Replies: 0
• Views: 5,449
07-18-2013, 06:18 PM
45. ### Expected number of times until x occurs

Hello all, I am just writing to see if this is right. There are two things that can occur. With a probability 1/a, event y occurs and you get a...

• Replies: 5
• Views: 5,447
BGM
06-10-2010, 10:30 PM
46. ### Help! First time taking Stats and soooo confused!

I'm taking Statistics online and every week I can barely get through the assigned problems. I'm not sure how to even begin figuring out this...

• Replies: 12
• Views: 5,442
11-06-2008, 09:53 AM
47. ### Special Continuous Distributions

I am NOT asking for answers!! Let me make that clear... I'm only asking for help in the method as to solving problems such as these. I missed my...

• Replies: 3
• Views: 5,441
11-03-2010, 06:55 PM
48. ### what is predictive power?

Can anyone please tell me what is meant by 'predictive power' of a statement? what is it represented as? Thanks

• Replies: 0
• Views: 5,440
09-08-2010, 07:20 PM
49. ### Interesting Bean Problem

Good evening, I've encountered an interesting problem and need a little help with it (: Question 1A) A bean is placed in a bag. The bean is...

• Replies: 6
• Views: 5,430
10-29-2010, 11:38 PM
50. ### Normal Probability Distribution

In 2010, the population of SAT scores were normally distributed with a mean of 1020 (reading and math only) and a standard deviation of 200. The NCAA...

• Replies: 2
• Views: 5,428
01-06-2011, 07:49 PM
51. ### Homework Help

I am not sure where to begin or what to do with the below question. Any help would be ace. Cheers. Suppose that fifty people are to be given a...

• Replies: 6
• Views: 5,427
05-01-2008, 10:48 PM
52. ### collect sales taxes on items purchased through the internet

Many states are carefully considering steps that would help them collect sales taxes on items purchased through the internet. How many randomly...

• Replies: 0
• Views: 5,419
12-06-2007, 03:58 PM

Question: There are 8,000 teachers at UCLA. The average age of all the teachers is 24 years with a standard deviation of 9 years. A random sample...

• Replies: 5
• Views: 5,416
10-14-2005, 08:55 PM
54. ### How can I find E[max Xi \ X1<X2<X3] ????

If Xi , i = 1, 2, 3, are independent exponential random variables with rate lambda_i, i=1, 2, 3 find E :conditioning problem How can I proof that...

• Replies: 0
• Views: 5,414
Kui
03-30-2009, 08:08 AM
55. ### simple probability questions

Hi, I need some help with this question, it seems simple, but I am not sure I did it correctly... In some country, there are 3 newspapers. 30%...

• Replies: 3
• Views: 5,412
06-18-2011, 03:04 PM
56. ### Help!!! Normal distribution probability problem..

I don't know if anyone asked similar question before, but the problem asks: The physical ﬁtness of a patient is often measured by the patient’s...

• Replies: 4
• Views: 5,411
10-14-2009, 12:47 PM
57. ### Conditional expectation question

Hey, I would really appreciate your help with the following question: X and Y each has a uniform distribution on and the two are independent....

• Replies: 8
• Views: 5,404
03-06-2010, 02:46 AM
58. ### Poisson Distribution

Here's the question: The number of calls that come into a small mail-order company follows a Poisson distribution. Currently, these calls are...

• Replies: 1
• Views: 5,398
02-24-2011, 04:17 AM
59. ### Poisson and Geometric Random Variable questions

Hi all, Can anyone tell me if I got the correct answers for the below two questions? Any help is appreciated. Q:Let X have a Poisson...

• Replies: 6
• Views: 5,397
04-28-2011, 10:29 PM

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