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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. ### normal distribution

Hi I am having trouble with normal distribution as part of my SPC module for a business course. I understand the equations for binomial and...

• Replies: 1
• Views: 2,192
09-06-2006, 02:45 PM
2. ### Binomial Model?

Hello, Would appreciate any help with the following question.. A shoe store's records show that 30% of customers making a purchase use a credit...

• Replies: 5
• Views: 2,603
09-05-2006, 08:35 AM
3. ### Easy probability question, but I am clueless

Hello, I am an MBA Student taking a Business Stat class and I am really struggling with probability. I can enter the information into the...

• Replies: 5
• Views: 2,687
09-04-2006, 06:28 PM
4. ### student-t to N(0,1)

PLS. HELP HOW DO YOU SHOW THAT THE lim as p->infinity f(x|p) = (1/sqrt2pi)e^-(x^2/2),:( :( where f(x|p) is a student t distn with p degrees of...

• Replies: 0
• Views: 2,184
09-04-2006, 05:38 PM
5. ### probability

It is known that 30% of all customers of a major national credit card pay their statement in full before any interest charges are incurred. for a...

• Replies: 2
• Views: 2,752
09-03-2006, 03:46 PM
6. ### probability

according to the CRA, the chances of your tax return being audited are 3 in 100 if your income is less than \$60,000 and 8 in 100 if your income is...

• Replies: 2
• Views: 2,617
09-03-2006, 03:32 PM
7. ### probabiliy distribution

A factory has recorded the number of workplace injuries per week and deriveed the following probability disstribution. Number of injuries (x)= 0...

• Replies: 2
• Views: 2,058
09-03-2006, 03:28 PM
8. ### Z score question

Hello there was wondering if someone could help shed some light on this question for me..any help would be greatly appreciated.. The mean height...

• Replies: 3
• Views: 3,514
09-03-2006, 08:52 AM
9. ### Z Table Lookup Question

I have the following practice question: P(-3.80<z<-2.40) Why is the answer .0081? How do I find that?

• Replies: 2
• Views: 3,031
09-02-2006, 06:00 PM
10. ### Please clarify this problem

I dont even know what to make of the problem. May be one of you can help me out by explaining what is S. An experiment involves tossing a pair of...

• Replies: 1
• Views: 2,349
09-01-2006, 06:59 PM
11. ### Am I right?

The odds are two to one that when A and B play tennis A wins. Suppose that A and B play two matches. What is the probability that A wins at least...

• Replies: 2
• Views: 4,702
09-01-2006, 06:37 PM
12. ### pobability, pls help

A survey by the Canadian frequent flyers association revealed that 60% of its members made independent airline reservations last year. If two...

• Replies: 2
• Views: 2,550
08-31-2006, 11:45 PM
13. ### pls help me with im desperate

a local bank reports that 70% of its customer maintain a chequing account, 50% have a savings account an d 40% have both. of a customer is chosen...

• Replies: 2
• Views: 4,663
08-31-2006, 11:42 PM
14. ### no idea of what formula to use

I'm not sure what exactly the question is asking or what formula I should use.....If someone has an opinion on a formula, that would be greatly...

• Replies: 3
• Views: 3,770
08-31-2006, 09:32 AM
15. ### Can you figure this out?

My company has a Safety Bingo game. For every day there is no accident in the plant, we pull a number. Every associate has a card and there are 110...

• Replies: 2
• Views: 3,293
08-30-2006, 09:25 AM
16. ### Newbie Really Needing Help

I am having a problem with one of my assignments for my class, and for the life of me, I cannot solve it. Any help would be much appreciated! Here...

• Replies: 4
• Views: 2,431
08-29-2006, 09:35 PM
17. ### Analyzing averages with different number of trials

Hi everyone, I am having trouble with figuring out the workings of the following problem: If you have two drivers A and B. Driver A wins 100...

• Replies: 1
• Views: 2,260
08-29-2006, 01:24 PM
18. ### Simple prob?

Demand for a car is normally distributed with a certain mean and stdev. There is a lead time of exactly "x" number of weeks for a car order. ...

• Replies: 0
• Views: 2,038
08-28-2006, 11:08 PM

Bank would like to examine the required sample size needed to be able to estimate the mean dollars that each card holder will spend each month. It...

• Replies: 2
• Views: 3,557
08-27-2006, 12:09 AM
20. ### Need help with this assignment.

Please help me with this assignment: A. cash back when the consumer make an online purchase; B. cash back when the consumer make a purchase at...

• Replies: 0
• Views: 2,492
08-25-2006, 11:32 PM
21. ### circular permutation

Hello: I have a probability problem I would like some takes on, please. "There are 5 boys and 3 girls sitting around a circular table. What is...

• Replies: 5
• Views: 4,373
08-17-2006, 09:41 AM
22. ### identifying the distribution of a data set

Dear all I am creating a software that is reading tcp packets from a link. I have the following information available: size of the packet: ...

• Replies: 4
• Views: 5,156
08-16-2006, 10:58 PM
23. ### Conditional Probability

I've been working on this one for the last 3 days to no avail. The problem is this: "A statistics professor wants to ensure that she is not late...

• Replies: 1
• Views: 5,709
08-15-2006, 09:59 PM
24. ### sounds like a simple probability question

Hope someone can help me. A store has 6 TV graphic magazines and 8 Newstime magazines on the counter. If two customers purchased a magazine, find...

• Replies: 5
• Views: 3,075
08-14-2006, 09:05 AM
25. ### exponential distribution?

Hi, I'm a research assistant with limited background in stats. We have a variable that is well-approximated by an exponential distribution. ...

• Replies: 3
• Views: 2,562
08-04-2006, 03:44 AM
26. ### Binomial distribution

Can someone explain to me why for a binomial distribution you can't analyze an event that is changing over time?

• Replies: 1
• Views: 2,307
08-02-2006, 09:50 AM
27. ### Is it a normal distribution?

The median income of residents in a certain community is \$20,000. If 1,000 peopole are randomly sampled from the population of residents, let x equal...

• Replies: 0
• Views: 1,986
new
08-01-2006, 03:29 PM
28. ### High Sig. Values in ANOVA and post-hoc?

I have another question, which I'm looking for a statistical opinion on. On the ANOVA & Post-hoc analysis in SPSS: When we look for statistical...

• Replies: 0
• Views: 2,480
07-30-2006, 12:34 PM
29. ### counting rule questions

Consider 5 card poker hands dealt from a 52 card deck. two important events are: A(you draw a flush), B(you draw a straight). Q: find P(A)? find...

• Replies: 0
• Views: 2,583
new
07-29-2006, 04:55 PM
30. ### Calculating "p-value"

Hello, I'm brand new to this site...and trying to figure out (I know this is probably very elementary to all of you) "What is the value that appears...

• Replies: 0
• Views: 2,718
07-29-2006, 10:51 AM
31. ### Poisson distribution...anyone good with those?

The question is: 4.One department store has two entrances. The number of car entered each entrance are Poisson distribution. The first entrance...

• Replies: 0
• Views: 2,260
07-28-2006, 10:44 PM
32. ### Exam Review Question: Poisson Probability

I have gone over my exam review and I understand most of the questions on the review, but here is a question I am not sure how to solve. I know the...

• Replies: 0
• Views: 4,277
07-23-2006, 06:56 PM
33. ### Hi there

Hi everyone If I have 100 recipe sheets. And, 10 of these sheets are linked because they all contain the same ingredient. I have been told that...

• Replies: 3
• Views: 2,488
07-19-2006, 02:34 PM

In the casino game called High-Low, there are three possible bets. Assume that \$1 is the size of the bet. A pair of fair six-sided dice is rolled and...

• Replies: 1
• Views: 5,048
07-19-2006, 09:20 AM
35. ### 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: 5,581
07-19-2006, 09:17 AM
36. ### calculating frequency of ingredients in various cookbooks?

Hi Everybody I just need a push in the correct direction of which statistics formula I should use and how? I am given x number (unknown) of...

• Replies: 3
• Views: 2,373
07-19-2006, 09:14 AM
37. ### Probability

A programmer designed a new program that required the user to enter a 3 character password in order to be recognized as a legal user. The first...

• Replies: 1
• Views: 3,822
07-10-2006, 10:51 AM
38. ### Distribution of X

Well, finally finished my assignement! Here's my stumbling block though: How to tell what methods or equations to use when a problem is posed?! I...

• Replies: 2
• Views: 3,762
07-07-2006, 12:57 AM
39. ### Probability Question

Problem I'm working on. Mean-242.2; Standard deviation =45.4; Using a normal probability distribution function I have calculated various...

• Replies: 0
• Views: 2,063
06-28-2006, 05:15 PM
40. ### Box Plots

I have got some box plots of my data and need to interpret them .I sort of understand what they mean and what it represents but am unsure of how to...

• Replies: 1
• Views: 3,301
06-26-2006, 03:21 PM
41. ### Mum's doubt...

Hi, I need some help for my mum... Here's it: How can you calculate k, knowning that X~N(a,b) and P(X>k)=c with c>0.5? :confused: I know that...

• Replies: 0
• Views: 2,115
06-25-2006, 02:56 PM
42. ### World Cup - a simple probability question

Hi All I hope this is not considered too far outside the purpose or spirit of this site! I haven't touched statistics since doing A level...

• Replies: 2
• Views: 2,544
06-21-2006, 10:50 AM
43. ### confidence in expected value

Hi, My question is about confidence levels in expected values for a distribution that is being sampled. Assume we have two different probability...

• Replies: 0
• Views: 2,442
06-21-2006, 04:43 AM
44. ### Analyzing test results- Normal Distribution

I’m trying to compare my grade on my Algebra exam to my fellow students using the normal distribution. Here are the results of the exam: ...

• Replies: 0
• Views: 5,673
06-20-2006, 10:02 AM
45. ### Pair multiple dice

Help I have developed a mental block, and despite searching I cannot find any information about how the following works. My problem is...

• Replies: 4
• Views: 4,151
06-17-2006, 11:04 PM
46. ### Difference between two Normal Distributions

I have a problem where I have two Normal distributions both with a standard deviation of 20 and a difference between the means of 17. I want to work...

• Replies: 0
• Views: 8,021
06-13-2006, 10:41 AM
47. ### conditional mean of a lognormal variable

Hi, does anyone know whether there exists a code or program to calculate the conditional mean of a lognormal variable, e.g. E? Thanks, tarama

• Replies: 0
• Views: 3,123
06-06-2006, 11:03 AM
48. ### another Probabilty distribution :)

Hi, okay here is another probabitly question that I was having trouble with. Q1: A company services home air conditioners. It is knwon that time...

• Replies: 0
• Views: 4,701
06-01-2006, 08:46 PM
49. ### random variables/probability distributions

nevermind:)

• Replies: 0
• Views: 2,145
06-01-2006, 08:34 PM
50. ### Normal distribution and intervals

I keep turning these around and am hoping I am on the right track Distribution of raw scores has mean=581 and sd=70. Find the interval of...

• Replies: 1
• Views: 2,254
05-30-2006, 10:10 AM
51. ### probability distribution

A keyring contains 4 keys that appear to be identical, although only one will open a particular door. Describe the probability distribution of X: ...

• Replies: 1
• Views: 2,764
05-29-2006, 03:09 PM
52. ### another probability

this question has three parts and once again I was able to answer part A and B by drawing the tree diagram but I cant seem to figure out part C ...

• Replies: 2
• Views: 2,638
05-25-2006, 09:05 PM
53. ### P Value

38 of 120 high school students work over 20 hours per week. Does this demonstrate that more than 25% of high school students work over 20 hours...

• Replies: 0
• Views: 3,114
05-24-2006, 11:39 PM
54. ### probability geneticist

I was able to answer the first 3 parts of this question but i cant figure out the last one A geneticist has bred three different strains of...

• Replies: 1
• Views: 2,708
05-24-2006, 08:02 PM
55. ### Uniform Dist.

Hey, havin a bit of trouble on this question, not quite sure what to do If X is uniformly dist. over a range of values 8 to 21 pr(X>=7)? Do...

• Replies: 2
• Views: 2,584
05-23-2006, 04:12 AM
56. ### word problems

Here are a few more questions that I got wrong and need help figuring out if anyone could help. Question 1: The length of time for students to...

• Replies: 3
• Views: 4,036
05-19-2006, 12:21 PM
57. ### figuring out a cutoff value

:confused: Hello :confused: Since my teacher hasn't replied to any of my e-mails, I could use some help related to continuous probability...

• Replies: 1
• Views: 7,862
05-19-2006, 12:20 PM

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