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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: 30,323
09-30-2005, 09:44 AM
1. ### General Comments Regarding Odds

"To get the probability of winning the jackpot, multiply .00000034847 by the probability of matching the power ball, to get .0000000082969 or odds of...

• Replies: 0
• Views: 3,162
08-29-2005, 10:18 PM
2. ### Buffon's Needle Experiment

This problem is quite interesting: A fine needle of length l is dropped at random on a board covered with parallel lines distance d apart where...

• Replies: 0
• Views: 8,610
10-04-2005, 02:08 PM
3. ### Conditional Probability

To reduce theft, the ABCD Company screens all its employees with a lie detector test that is known to be correct 90 percent of the time (for both...

• Replies: 0
• Views: 7,525
10-30-2005, 11:59 PM
4. ### Binomial Probabilities

These kinds of questions can be answered using the binomial probability distribution: 1. If I flip a coin 20 times, what is the probability of...

• Replies: 0
• Views: 49,061
11-01-2005, 02:50 PM
5. ### Symbols in statistics

x^n x to the power of n, x^2 is x squared nPr Permutation, nPr = n!/(n-r)! nCr Combination, nCr = n!/(r!(n-r)!) P(A|B)

• Replies: 0
• Views: 10,959
11-07-2005, 04:11 PM
6. ### Poisson distribution

The Poisson Distribution is often used as a model for the number of events occuring within a specific time period. The Poisson probability mass...

• Replies: 0
• Views: 23,420
11-17-2005, 12:25 PM
7. ### Hypergeometric Probabilities

These are similar in principle to the binomial distribution, with one major exception - the hypergeometric probability is for situations where you...

• Replies: 0
• Views: 12,563
02-20-2006, 11:59 AM

You are doing an industry analysis of the Bloomington pizza industry. The rate (per year) at which pizza restaurants enter the industry is given by...

• Replies: 0
• Views: 3,747
02-28-2006, 12:09 PM
9. ### Proof

Hi everybody! We would like to proof the following statement: given a random variable X with probability density function f(x) having support in...

• Replies: 0
• Views: 2,489
03-09-2006, 09:52 AM
10. ### In a certain town....

40% of voters favor a given ballot measure. For groups of 22 voters, find the mean and standard deviation for the number who favor the measure.

• Replies: 0
• Views: 4,332
03-19-2006, 10:21 PM
11. ### creating sten scores

Hi, Please can someone help me out with creating a sten score - I am unsure of the process to follow to do this - is it something that can be...

• Replies: 0
• Views: 6,016
03-20-2006, 12:01 AM
12. ### HELP studying for a FINAL EXAM

Hello everyone, I have a final that I am studying for, the final isnt till thursday. But I am having problems soving some probability problems, I...

• Replies: 0
• Views: 2,544
03-20-2006, 06:39 PM
13. ### Realing struggling

I know this is probably a simple problem, but I can't seem to wrap my brain around it. Here it is: You are dealt 5 cards from a well shuffled,...

• Replies: 0
• Views: 2,930
04-15-2006, 07:00 PM
14. ### Yet more problems!!!

OK. Like I said. I am really struggling with this. Here are two more I can't grasp. 1. You are fishing at a Reservoir. The Department of...

• Replies: 0
• Views: 2,084
04-15-2006, 07:08 PM
15. ### Probability involving stock market help pls

Stock A and stock B. Every day the price of stock A will either increase by 1 dollar with probability 0.6 or decrease by one dollar with...

• Replies: 0
• Views: 3,567
04-19-2006, 04:59 PM
16. ### Normal Distribution Problem

I'm having trouble getting this one started: Jake runs the concession stand for a Chicago area minor league baseball team. He knows that hot dog...

• Replies: 0
• Views: 3,408
04-20-2006, 08:58 PM
17. ### Conditional Probability and Variance

In a conditional probability problem, I have computed Var(X|Y=y) for all values of y. How would I go about computing the Var(X) using this...

• Replies: 0
• Views: 3,998
04-20-2006, 09:59 PM
18. ### Help! Test Tomorrow

O.K. Here is my question that I am struggling with: Of all college freshman that try out for the track team, the coach will accept only 30%. If 15...

• Replies: 0
• Views: 5,109
04-20-2006, 11:24 PM
19. ### poisson process probability distributions

• Replies: 0
• Views: 3,079
04-20-2006, 11:56 PM
20. ### Exponential Probability

Data are observed on lifetime of 5 electronic units (in hundreds of hours): 6.7, 5.0+, 6.1, 8.0, 10.0 where the "+" denotes that the unit's...

• Replies: 0
• Views: 2,552
04-26-2006, 10:16 AM
21. ### 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: 3,155
05-24-2006, 11:39 PM
22. ### random variables/probability distributions

nevermind:)

• Replies: 0
• Views: 2,189
06-01-2006, 08:34 PM
23. ### 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: 4,715
06-01-2006, 08:46 PM
24. ### 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: 3,148
06-06-2006, 11:03 AM
25. ### 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: 8,066
06-13-2006, 10:41 AM
26. ### 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: 5,734
06-20-2006, 10:02 AM
27. ### 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: 2,455
06-21-2006, 04:43 AM
28. ### 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: 2,156
06-25-2006, 02:56 PM
29. ### 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: 2,082
06-28-2006, 05:15 PM
30. ### 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: 4,331
07-23-2006, 06:56 PM
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: 2,288
07-28-2006, 10:44 PM
32. ### 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: 2,729
07-29-2006, 10:51 AM
33. ### 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: 2,600
new
07-29-2006, 04:55 PM
34. ### 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: 2,499
07-30-2006, 12:34 PM
35. ### 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: 1,996
new
08-01-2006, 03:29 PM
36. ### 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: 2,514
08-25-2006, 11:32 PM
37. ### 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: 2,078
08-28-2006, 11:08 PM
38. ### 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: 2,209
09-04-2006, 05:38 PM
39. ### Help! Expected value, standard deviations and probabilities...

Hi I have no clue how to even start this....it's been a long time since I've done stats...and this is for a finance class: Suppose a firm's stock...

• Replies: 0
• Views: 2,508
09-13-2006, 06:39 PM
40. ### Geometric Distribution

A geometric Distribution is a discrete probability distribution of a random variable x that satisifies: 1. A trial is repeated unitl a success...

• Replies: 0
• Views: 26,806
09-14-2006, 05:48 PM
41. ### Pie slices

Hi all, I would like to know what the probability distribution for the number of pie slices could be. Or the stochastic process behind slicing....

• Replies: 0
• Views: 1,938
09-17-2006, 12:53 PM
42. ### Test score probabilities problem

Hi, appreciate any help you can provide. I tested patterns on salamanders as personal identifiers by giving human subjects images of 7 different...

• Replies: 0
• Views: 2,706
09-21-2006, 10:16 AM
43. ### A solitaire game with no possible moves?

Hi everyone. I just opened a solitaire game on my computer with no moves possible. Does anyone have any idea what the probability of this happening...

• Replies: 0
• Views: 2,423
09-21-2006, 09:17 PM
44. ### prove inequality

inequality theorem

• Replies: 0
• Views: 3,677
09-23-2006, 05:48 PM
45. ### Expectation, variance and covariance question

Hi I have a question which I stuck some point. Question: X_t, X_s, Y_t, Y_s, Z_t, Z_s, (~Z_t), (~Z_s) are i.i.d time series r.v. (~ is tilda...

• Replies: 0
• Views: 3,310
09-24-2006, 06:58 PM
46. ### Anyone can help me?

I have a question asking about how to calculate the probability when the number of outcomes is not finite. Two points L and M are placed...

• Replies: 0
• Views: 1,784
09-27-2006, 06:29 AM
47. ### Help With Negative Binomial Distribution

The negative binomial (Pascal) distribution is defined as: n = alpha + k -1 P(subK)= How do you show that the Variance is: V = alpha...

• Replies: 0
• Views: 2,632
10-02-2006, 07:53 AM
48. ### Chuck-a-luck

in the game chuck-a-luck, three dice are rolled. A player bets a certain amount (say \$1) on a number from one to six. If the number appears on one...

• Replies: 0
• Views: 3,858
10-04-2006, 11:23 PM
49. ### bag of marbles

A bag with red marbles and blue marbles has more blue than red. If you add red marbles until 1/3 of the marbles in the bag are blue; yellow marbles...

• Replies: 0
• Views: 2,656
10-04-2006, 11:33 PM
50. ### New bee in probability..plzz help..

There are 5 red balls and 5 green balls in an upturned hat. If you remove the balls from the hat at random what are the chances of the following? ...

• Replies: 0
• Views: 1,781
10-08-2006, 10:44 PM

I do not need the answers to these questions, i just need to know how to solve them!!! please!! question 1: A board consisting of 8 members, 3 men...

• Replies: 0
• Views: 2,299
10-17-2006, 05:00 PM
52. ### Probability Help

There are 5 problems I just can't get. The set up is that there are twenty ice cream cones with 5 flavors (cherry, vanilla, chocolate, strawberry,...

• Replies: 0
• Views: 1,945
10-21-2006, 11:07 PM
53. ### need help ASAP w/ problem.

20 balloons, 4 white, 4 green, 4 red, 4 blue, 4 yellow. 10 kids; 4 boys and 6 girls. Each kid is to receive 2 balloons. What is the probability that...

• Replies: 0
• Views: 2,164
10-22-2006, 02:20 AM

Hi, I have a problem, I try to solve but still get stuck. Can you please read my solution and point out what my wrong points are? Xn is a...

• Replies: 0
• Views: 2,610
10-22-2006, 04:48 PM
55. ### Binomial Distribution Problem

I'm at work, so I don't have the problem verbatim, but it's something like this: Suppose that companies who launch products with revenue growth as...

• Replies: 0
• Views: 3,316
10-23-2006, 08:49 AM
56. ### 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: 5,474
10-24-2006, 12:27 PM
57. ### Probability of sequential deaths and dates

Hi all, I hope today finds you well and in good spirits. I'm trying to develope a statistical model and haven't done so in years. Any help is...

• Replies: 0
• Views: 4,210
10-27-2006, 07:13 AM
58. ### A reversal of the Birthday Problem

I hope today finds you well and in good spirits. I am trying to develop a model based, in part, on the Classic Birthday Problem. Looking at...

• Replies: 0
• Views: 3,374
11-05-2006, 05:29 PM
59. ### Lognormal distribution

I dont know where to begin on this one. I need to compute Q=a 50 year flood Q is lognormal distributed given Q= a 50 year flood mu=...

• Replies: 0
• Views: 3,845
11-13-2006, 02:34 AM

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