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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: 30,170
09-30-2005, 09:44 AM
1. ### PLEASE~ tell me if i'm doing these correctly

This is the first question for my assignment...I've used a tree diagram to solve this one. Please~~ if anyone can tell me if i'm doing this...

• Replies: 0
• Views: 2,419
08-08-2007, 08:50 PM

1.Give interpretations of the terms bias and "precision" as used in the practice of forecasting 2.Explain the terms "Goodness of fit" and...

• Replies: 1
• Views: 2,113
08-07-2007, 02:46 PM
3. ### Need Help with Practice Exam Question ASAP

Hi. I have an exam coming up and I have no clue on how to do this problem on the practice exam. Can someone help me as soon as you can? Thanks. ...

• Replies: 0
• Views: 2,411
08-06-2007, 08:03 AM
4. ### Quetion Reffering to your keno probabilities

Hello, I was googling about Keno probabilities and came across a thread in your forum about probability of hitting 5 numbers out of 80 with a draw...

• Replies: 0
• Views: 3,135
08-03-2007, 11:06 PM

I have done some basic inferential statistics before but not really done much probability before. I was wondering if someone could help me out with...

• Replies: 0
• Views: 2,046
07-31-2007, 04:11 AM
6. ### Desperately needing homework help!

I tried the math lab at the local college and the statistics professor was as stumped as I was! A videotape has an average of one defect every...

• Replies: 4
• Views: 4,773
07-30-2007, 04:02 PM
7. ### Help

When a customer enters a store there are three outcomes that can occur: buy nothing, buy a small amount or buy a large amount. In this situation, if...

• Replies: 1
• Views: 3,335
07-29-2007, 07:20 PM
8. ### Help on prior distribution...

Cosider a random sample of n (consider n>100) elements, and each of them belongs to one of possible classes c1, c2,...ck (consider k<60 clases) from...

• Replies: 0
• Views: 2,320
07-29-2007, 02:05 PM
9. ### How to approximate a non-standard pdf?

Hi All, I've got a bit of a techincal question here that I would greatly appreciate some guidance on. Although I have some experience with...

• Replies: 4
• Views: 3,483
07-25-2007, 11:49 AM
10. ### Homework Question

I posted this in the "Statistics" thread, then realized it should probably be here, in "Probability". Forgive my repetitiveness! Hi everyone: ...

• Replies: 1
• Views: 3,830
07-24-2007, 09:30 AM
11. ### distribution function of the division of two variables

Hello Probably this is a silly question, but its is being resulting a non obvious task for me. Any isight would be welcome. I have a continous...

• Replies: 1
• Views: 5,769
07-20-2007, 11:44 PM

I have no understanding of statistics whatsoever. I need help with the following two problems: 1. Eight events in a certain sample space have an...

• Replies: 1
• Views: 2,849
07-20-2007, 11:33 PM
13. ### Exponentially Distributed Random Variable

Hey everyone, im having a hard time with this questions, I guess its just not clicking. I was wondering if someone could give me some pointers. ...

• Replies: 1
• Views: 4,336
07-20-2007, 07:11 AM
14. ### Breakeven exit strategy

Hi, I have a gambling problem (admitting it is half the battle, right?), that I hope someone can help me with. Suppose that I know from historical...

• Replies: 0
• Views: 2,521
07-18-2007, 01:22 AM
15. ### About marginal densities... confused

If we have N random variables (not necessarily normal; with some level of correlation) and M observations of them (i.e. we have M N-dimensional...

• Replies: 1
• Views: 2,509
07-13-2007, 09:38 PM
16. ### need help with a few questions

the question is: A shrub that is purchased at a local nursery has probability .80 of surviving the first year. If a customer pruchases 4 shrubs,...

• Replies: 1
• Views: 4,770
07-13-2007, 03:55 AM
17. ### Probability distribution

5.20 An investor plans to put \$50,000 in one of four investments. The return on each investment depends on whether next year’s economy is strong or...

• Replies: 1
• Views: 5,377
07-11-2007, 12:33 AM
18. ### Am I doing this right?

:confused: Im not sure if im doing this right. This is the question that I am working on right now. You wish to open a new restaurant and are...

• Replies: 1
• Views: 2,517
07-04-2007, 01:44 AM
19. ### Normal Distribution Problem

Hi, I've been working on this problem for a while now and keep getting stuck. The problem says, The length of time before a cell phone using a...

• Replies: 1
• Views: 4,368
07-03-2007, 01:37 PM
20. ### Expected Value of Exponential Distribution

I've almost completed this problem, but I'm stuck on the last part. The first two parts that I've already shown are also given: a) For a whole...

• Replies: 1
• Views: 24,910
07-03-2007, 01:24 PM
21. ### Help with Conditonal Probability

I think this is a classic problem. :) Oscar has lost his dog in either forest A (with a priori probability 0.4), or in forest B (with a priori...

• Replies: 1
• Views: 5,805
07-03-2007, 01:08 PM

Hi, I've got a probability problem that has had me stumped all weekend. Can anybody please help? Suppose that two balanced dice are tossed...

• Replies: 1
• Views: 7,415
07-03-2007, 12:20 PM
23. ### Quantifying the Prediction Error

Hello, I have a Regression model which predicts the length of certain vectors that exists in Financial Markets. These vectors start in the...

• Replies: 1
• Views: 3,051
06-29-2007, 08:43 AM

Hi, I've been working on an extra credit problem, which seems pretty easy but I can't figure it out. It's only 2 points, but any help would be...

• Replies: 4
• Views: 2,817
06-28-2007, 01:42 AM
25. ### Probability: Is this right?

Chances of being audited are 3 in 100 if income less than 60 000 and 8 in 100 if income more than 60 000 a. if 7 taxpayers with income over 60 000...

• Replies: 1
• Views: 2,226
06-25-2007, 12:46 AM
26. ### Probability

Let X1,…,X25 be binomial random variables with identical parameters n=100 and p=0.3. Use the central limit theorem to calculate the probability that...

• Replies: 2
• Views: 2,035
06-21-2007, 11:47 PM
27. ### How is it possible to account for lucky guesses?

I need to solve a problem involving assessing the ability of prospective film analysts to make accurate predictions of the total U.S. box office...

• Replies: 0
• Views: 3,189
06-21-2007, 05:21 PM
28. ### Mean question

An oil exploration firm is formed with enough capital to finance 30 explorations. The probability of a particular exploration being successful is...

• Replies: 2
• Views: 6,040
06-21-2007, 07:27 AM

I have a problem, I am just not figuring out and would love some help. Return on Common Stock has a mean of 14.4% and a standard deviation of...

• Replies: 1
• Views: 1,952
06-21-2007, 01:41 AM
30. ### Need help random variables

Question 1) A hung jury is one that is unable to reach a unanimous decision. Suppose that a pool of 25 potential jurors are assigned to a murder case...

• Replies: 2
• Views: 4,041
06-19-2007, 06:10 PM
31. ### Need help on statistics problem

Pregnancy durations; Data from the national vital statistics report reveal that the distribution of the duration of human pregnancies is...

• Replies: 1
• Views: 2,295
06-19-2007, 02:09 AM
32. ### Conditional Probability

I was given this example to study, no solution to check my work. Can you help? I approached (a) using 1-P?? 1-30/100 and (b) 30/100+10/100-5/100...

• Replies: 2
• Views: 2,580
06-18-2007, 12:59 AM
33. ### Probability of a "success" n or more times out of 10

Hello everyone! This is my first post on these forums. :) I've got a bit of a curiosity that I've been trying to figure out for a few days. I'm not a...

• Replies: 2
• Views: 4,799
06-17-2007, 08:26 AM
34. ### Intersection of compliment--help needed

Hi There: First time visitor. I have 2 mutually exclusive events A,B. Probability P(A)=0.7,P(B)=0.2 How can I calculate P(A and B')? I think the...

• Replies: 3
• Views: 3,144
06-17-2007, 04:14 AM
35. ### Can't understand some probability symbols.

For two events, A and B, P(A) =1/2, P(B) =1/3, and P(A �� B) =1/4. Find P(B | A). The symbol where is shows a box here is an upsidedown U. Does...

• Replies: 2
• Views: 21,864
06-17-2007, 01:00 AM
36. ### no idea where to start Urgent

An interior decorator must furnish two offices. Each office must have a desk, a chair, a file cabinet and 2 bookcases. At a local office furniture...

• Replies: 1
• Views: 2,370
06-17-2007, 12:55 AM
37. ### Simple (?) probability question (colors problem)

Hi all, I would really appreciate if you can help me out with (what it seems) this simple probability problem. What is throwing me off is the part...

• Replies: 3
• Views: 2,790
06-14-2007, 10:21 AM
38. ### Optimum count

Hi, I am new to this forum and hope that I am posting this question in the right section. Here is the problem that I need help on. I am using an...

• Replies: 2
• Views: 2,558
06-14-2007, 08:00 AM
39. ### Finding the probability, given only the mean

Hello, I am in desperate need for assistance. A tutee of mine had a problem with probability. Here is the question: According to J. D. Powers...

• Replies: 4
• Views: 6,060
06-13-2007, 02:22 PM
40. ### probability of consumption

could someone let me know what i'm doing wrong? A study of the amount of time it takes a mechanic to rebuild the transmission for a 1992 Chevrolet...

• Replies: 4
• Views: 24,306
06-13-2007, 11:06 AM
41. ### Uncorrelation

Hello. I'm stuck on how to start this problem. Any tips are appreciated. Let X be continuously distributed with a symmetic probability density...

• Replies: 1
• Views: 3,866
06-11-2007, 02:56 PM
42. ### Shooting Gallery Problem

I have a shooting gallery probability problem that I can't figure out. Basically, the scenario involves ten hunters that all have a perfect shot....

• Replies: 2
• Views: 2,115
06-10-2007, 09:41 PM
43. ### A simple but trickly probability question

My coworker asked me a probability problem. It seems simple, but, maybe not actually. Could anyone help me and take a look at the problem? Your...

• Replies: 2
• Views: 2,155
06-09-2007, 05:01 AM
44. ### Random Number Generator

I know this is a message board for homework but I have a question for something that I'm actually doing at work. Its been three years since my...

• Replies: 1
• Views: 4,169
06-08-2007, 04:06 AM
45. ### Looking for contributors

Do you have a background or interest in math or statistics? Do you enjoy helping people, especially beginners, understand a complex concept? ...

• Replies: 0
• Views: 3,250
06-07-2007, 09:56 PM
46. ### probabilty- setting up variables...(high school)

i have a quick question. here's the problem From past experience, Stephane Voiture, manager of sales at Downsview Motors, knows that 10% of...

• Replies: 0
• Views: 1,942
06-04-2007, 08:50 AM
47. ### Guidance

Hi, Can someone please send me in the right direction with this problem? I think it is to do with the random variable??? The president of an...

• Replies: 1
• Views: 3,861
06-03-2007, 05:54 PM
48. ### 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: 2,755
06-03-2007, 05:50 PM
49. ### 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: 3,676
06-01-2007, 08:14 AM
50. ### 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: 3,146
06-01-2007, 04:45 AM
51. ### 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: 5,049
05-30-2007, 04:17 PM
52. ### Hello

Hello everybody

• Replies: 0
• Views: 2,043
05-30-2007, 10:53 AM

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: 2,523
05-30-2007, 08:34 AM
54. ### 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: 2,827
05-29-2007, 03:44 PM
55. ### 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: 3,695
05-29-2007, 05:47 AM
56. ### 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: 3,188
05-27-2007, 01:25 AM
57. ### 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: 3,142
05-23-2007, 03:46 PM
58. ### 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: 4,617
05-23-2007, 03:38 PM

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