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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: 30,238
09-30-2005, 09:44 AM
1. ### Hypergeometric Probablility

I have a question here, bit of an old one and there have been a lot of examples about it before but I couldn't find any solutions. Its goes as such:...

• Replies: 0
• Views: 3,299
01-21-2007, 12:52 PM
2. ### Probability

Two Questions 1. Number of units sold 0 1 2 3 4 5 Probabiltiy of units .1 .15 .2 .35 ...

• Replies: 2
• Views: 3,150
01-25-2007, 10:52 AM
3. ### Multiple normal distributions

Post removed.

• Replies: 0
• Views: 2,759
bcs
01-26-2007, 07:04 PM
4. ### Probability

I have been working on this problem for a couple of hours. :confused: From a survey of Americans, it was found that 65% of the respondents do not...

• Replies: 2
• Views: 2,290
01-28-2007, 11:30 AM
5. ### need help with a handful of question

Hello.. I just found this site and I was wondering if you guys could help me. I've never been very good at stats and I've been working on questions...

• Replies: 3
• Views: 2,566
01-28-2007, 11:48 AM
6. ### Complements, Unions, and Intersections

Help!:shakehead In a market research survey participants were asked if they put ketchup directly on their fries or along side. 26% of men said...

• Replies: 4
• Views: 4,198
01-28-2007, 01:57 PM
7. ### Weighted sums of random variables

In an effort to determine the expected return of two stocks (A and B), I'm instructed in my homework to use the formula Y=a(subscript)1 X(sub)1 +...

• Replies: 1
• Views: 3,232
01-28-2007, 04:03 PM
8. ### probaliblity question

a producer of a fruit drink advertises it contains 10% real fruit juices. A sample of 75 bottles are analyzed and it's found that only 6.6% is real...

• Replies: 1
• Views: 2,249
01-28-2007, 04:27 PM
9. ### Gambling Theory / Martingale

Is anyone here familiar with gambling theory? If so, is the Martingale system a viable betting strategy where P(w) > .5, say .5061. Does anyone...

• Replies: 0
• Views: 1,962
01-28-2007, 09:31 PM
10. ### Poisson/Binomial - Conclusions Based on a Small Sample

Any help with the problem below is greatly appreciated. :wave: I have 100 days of observations of a geyser. In those 100 days, the geyser shot...

• Replies: 2
• Views: 3,545
01-30-2007, 10:10 PM
11. ### Permutation Problem - help me understand pls!

I am reading this example about permutation and can't understand how to go about rationalize it. Example: Suppose that 2 anthropology, 4 computer...

• Replies: 1
• Views: 5,886
01-31-2007, 06:17 AM
12. ### A probability/stat elementary problem

Hi, I am currently reviewing probabilities on my own and encountered problems which i can't seem to do. Hopefully someone here will be kind enough to...

• Replies: 2
• Views: 4,464
01-31-2007, 01:54 PM
13. ### Conditional probability...

------- Jose and Jim go duck hunting together. Suppose that Jose hits the target with a probability 0.3 and Jim, independently, with a probability...

• Replies: 1
• Views: 3,662
01-31-2007, 06:17 PM
14. ### Conditional Probability

I have been working on this problem for two hours and i can't seem to get it right! 28 crayons, 4 are red. they are divided among 4 people evenly....

• Replies: 0
• Views: 1,814
02-02-2007, 03:13 PM
15. ### Question about use of Poisson probabilities

I work for a firm that compiles a database of license plate numbers, some of which correspond to cars that flunk roadside emissions testing. We ...

• Replies: 0
• Views: 2,611
02-03-2007, 08:45 PM
16. ### Crazy union/intersection question.

Paul will be taking three exams - call them A, B and C. You are given: -It is certain that he will pass at least one exam. -The probability that...

• Replies: 1
• Views: 2,839
02-05-2007, 12:17 PM
17. ### Sample correlation

Im in desperate need and im stuck: Can someone plsease tell me where im going wrong with this question. Calculate the sample correlation between...

• Replies: 2
• Views: 2,398
02-05-2007, 12:28 PM
18. ### Easy problem, has me stumped, addition rule?

This has me stumped, possibly because the notes i took did not make sense to me, I may have it right, and if not, please correct me :] In a pop....

• Replies: 2
• Views: 2,626
02-05-2007, 11:05 PM
19. ### Distributions

Hello there, Finally got the hang of the this from by using my Excel. Although, I would love to do by the formula method. Im not sure what...

• Replies: 1
• Views: 2,885
02-06-2007, 07:45 AM
20. ### Probability and time

Hi This is not a homework question, alas school and university are many years ago for me; but I was wondering how you account for time when using...

• Replies: 0
• Views: 2,170
04-14-2007, 06:59 PM
21. ### prob question

I have a 3 part question and I think i've got the first 2 parts but i'm stuck on third. it's: there is a cabin that has a probability of.05 of being...

• Replies: 1
• Views: 2,172
04-17-2007, 07:42 AM
22. ### help

for df=15 find the value(s) of t associated with each of the following a) the top 5 % of the distribution b) the middle 95 % verus the extreme...

• Replies: 0
• Views: 1,938
04-17-2007, 04:14 PM
23. ### help

A random sample of selected from a normal population

• Replies: 4
• Views: 2,908
04-19-2007, 04:23 PM
24. ### 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: 5,508
04-19-2007, 05:31 PM
25. ### Silly baseball question.

I know I'm new, but it's not really my intention to just jump on here and post something and then never post again, honestly I don't know why I...

• Replies: 2
• Views: 5,838
04-22-2007, 08:57 PM
26. ### Need help plz

Here is the problem I am stuck on...it's easy, I just can't seem to figure it out for some reason: In a class, the grades are normally...

• Replies: 1
• Views: 2,009
04-24-2007, 01:06 AM
27. ### Probability Problem

I need some help with this probability problem. On any given day, Jen will sell 85% of her baked goods. For a sample of 500 potential customers,...

• Replies: 1
• Views: 5,129
04-24-2007, 01:15 AM
28. ### Point me in the right direction plz!

I need help with the second part of this problem: It turns out that the number of Pepsis John has in a week is normally distributed with mean 2.5...

• Replies: 0
• Views: 2,329
04-25-2007, 02:05 AM
29. ### Is the following relationship true?

This came from a paper I was reading. I tried to figure out how the authors reached their results and concluded that the following formula must be...

• Replies: 2
• Views: 2,349
04-25-2007, 08:37 AM
30. ### Help!

I need help with this problem: a wildlife biologist examines frogs for a genetic trait he suspects may be linked to sensitivity to industry toxins...

• Replies: 2
• Views: 4,748
04-26-2007, 12:27 AM
31. ### Learning Probability via a Tutorial Dialogue

Hi, I have set up a web-site on learning basic probability via tutorial dialogues. After an initial quiz, a talking head ("Dr. Brown") will...

• Replies: 0
• Views: 2,684
04-26-2007, 06:26 AM
32. ### confidence level

if i have a sample group of 148, and a response rate of 17%, what is my confidence level with the data?!

• Replies: 0
• Views: 3,057
04-29-2007, 03:05 PM
33. ### Normal Distribution

Please help me if possible The accounting department at Weston Materials, Inc., a national manufacturer of unattached garages, reports that it...

• Replies: 2
• Views: 3,430
04-29-2007, 06:14 PM
34. ### Introduction to Statistics question

Hello All, I have a question on my study guide that says A random sample of 64 observations produced the following summary statistics: sample...

• Replies: 1
• Views: 3,853
04-30-2007, 08:17 AM
35. ### URGENT help needed

A company are searching for 5 oil wells in a landscape the sucess rate of finding a hole is 10% (0.1) for each hole therefore failure must be 90%...

• Replies: 1
• Views: 2,036
05-02-2007, 09:50 AM
36. ### an interesting Bayesian stat question

Suppose a random sample of size n is from uniform distribution U(0, exp(gamma)), suppose the prior distribution of gamma is N(a, b), how to find the...

• Replies: 1
• Views: 1,952
05-02-2007, 11:21 AM
37. ### Intro to Probability

This IS a homework question, but if anyone feels they might lend me some advice, I would greatly appreciate it. University received 2851...

• Replies: 0
• Views: 3,437
05-03-2007, 11:42 AM
38. ### How to get this Z value?

P<=.667 Z.667 = .432 My question is how to get .432 by using the cumulative normal probability table(z-values). Thanks for your help,...

• Replies: 1
• Views: 2,276
05-05-2007, 03:16 PM
39. ### Newbie stuck with problem...

I am horrible at math and can't seem to grasp this at all... A local bank reports that 70% of it's customers maintain a chequing account, 50% have a...

• Replies: 1
• Views: 3,016
05-06-2007, 10:58 AM
40. ### deriving expected value of negative binomial distribution

Hey all, I've derived the expected value of the binomial distribution, but I can't seem to figure it out for the negative binomial distribution....

• Replies: 0
• Views: 11,738
05-13-2007, 07:50 PM
41. ### Its been a while since I opened a stats book

I run a business that uses phone numbers (without country code) to identify customers. We currently run in a country that uses 8 digit phone numbers...

• Replies: 1
• Views: 2,552
05-14-2007, 04:16 AM
42. ### Poker and the law...

Recently, a bill was signed in Indiana that classified poker (and all other card games ) a game of 'chance' and therefore illegal to play for money. ...

• Replies: 0
• Views: 2,102
05-16-2007, 12:10 PM
43. ### "Fair Game" problem

Hello, I'm new here. I joined in the hope that someone would be able to help me with this problem: --- Players A and B play a fair game for \$20:...

• Replies: 1
• Views: 3,533
05-18-2007, 12:54 PM
44. ### a random number generator problem

Hello all, I have to resolve the next type of problem: I have a machine that is supposed to generate truely random 0/1 values. If i'm testing...

• Replies: 1
• Views: 3,387
05-19-2007, 12:07 AM
45. ### Urgent Help needed. Thanks in advance.

Join Date: May 2007 Posts: 1 kellan is on a distinguished road Help needed on problem, URGENT! Thanks in advance. I'm stuck on figuring otu...

• Replies: 1
• Views: 3,441
05-19-2007, 12:51 AM
46. ### Desperate

It would be greatly appreciated if I could get some help with the following question. The probability of incurring an insurance claim loss of...

• Replies: 2
• Views: 3,351
05-20-2007, 08:09 PM
47. ### Previously Posted Question

I am trying to view the attachments that are connected to this previous thread. Can anyone help. http://www.talkstats.com/showthread.php?t=1301 ...

• Replies: 1
• Views: 2,536
05-21-2007, 02:38 AM
48. ### everything in life has a probablity of 50-50

take a minute to think about this: everything in life has a probability of 50-50. it either happenes or it doesn't. I have never inderstood why...

• Replies: 3
• Views: 4,652
05-23-2007, 03:38 PM
49. ### Mom and Daughter Birthdates

Hi to you all from the UK (Anglesey, Nth Wales) My friend Cathi and her daughter Manon were born on the same date and also the same time (Feb...

• Replies: 5
• Views: 3,150
05-23-2007, 03:46 PM
50. ### A conditional prob. question

Hi, I need some help regarding the following question. Given three random vectors- A, B,C where A and B are presumably statistically independent....

• Replies: 3
• Views: 3,202
05-27-2007, 01:25 AM
51. ### Probability Problem - urgent

A quality-control manager claims that a new process for manufacturing cameras is better because the rate of defects is lower than 5&#37;, which had been...

• Replies: 9
• Views: 3,709
05-29-2007, 05:47 AM
52. ### Odds of an event happening

Hi all I am trying to determine the odds of an event happening. Lets say I am throwing a coin a series of times (n= 100, 1000, whatever). my...

• Replies: 2
• Views: 2,834
05-29-2007, 03:44 PM

I understand what percentiles are, but I have a horrible teacher and can't figure out the following problem because I don't have an equation. I need...

• Replies: 2
• Views: 2,535
05-30-2007, 08:34 AM
54. ### Hello

Hello everybody

• Replies: 0
• Views: 2,058
05-30-2007, 10:53 AM
55. ### Expected Value of stocastically independent random variables

Hello. This seems like an easy problem, but I'm having trouble getting started. Hopefully someone can give me a hint. X_1,...,X_n are...

• Replies: 3
• Views: 5,104
05-30-2007, 04:17 PM
56. ### Relative Frequency

I'm stuck on this one problem. We have the relative error defined as the square root of the variance divided by the expected value. We need to...

• Replies: 1
• Views: 3,158
06-01-2007, 04:45 AM
57. ### Help!!!

I have two questions from an assignment that are stumping me. Although I'm sure they're simple this is an online summer class and the professor isn't...

• Replies: 3
• Views: 3,688
06-01-2007, 08:14 AM
58. ### Variance

could someone give me a hint to how to start this, please batteries in batches of 20 have a 3% rate of defects. find the variance for the number...

• Replies: 3
• Views: 2,765
06-03-2007, 05:50 PM

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