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Forum: Probability

Probability course and homework discussion. Probability distributions. Probability theory, stochastic processes

  1. Arrow Sticky Thread 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)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 30,320
    09-30-2005, 09:44 AM Go to last post
  1. Probability of the Sample Mean

    Assume 20 oz. cola bottles are filled so that the mean amount of liquid contained in the bottle is 20 oz and the standard deviation is .12 oz. If a...

    Started by ridley1013‎, 06-21-2008 04:00 PM
    • Replies: 1
    • Views: 3,155
    06-27-2008, 11:15 AM Go to last post
  2. What is memory/stationarity and how to check for them in a time series process?

    I was wondering if anyone could explain what memory was? and how to check for memory and stationarity of a general time series process? Thanks! ...

    Started by STP9‎, 06-27-2008 10:11 AM
    • Replies: 0
    • Views: 2,998
    06-27-2008, 10:11 AM Go to last post
  3. approximating binomial distribution w/ normal distribution

    Hi all, I'm stuck on the following problem: The percentage of fat in the bodies of American men is an approximately normal random variable with...

    Started by fiddlestix327‎, 06-24-2008 02:11 PM
    • Replies: 2
    • Views: 11,989
    06-25-2008, 06:45 PM Go to last post
  4. goodness of fit

    hello all, i have a question concerning goodness of fit for a set of data. Specifically, I have a large data set, and I'd like to know if the data is...

    Started by jamesmartinn‎, 06-24-2008 01:52 PM
    • Replies: 2
    • Views: 3,268
    06-25-2008, 11:51 AM Go to last post
  5. Probability and distribution

    I've some problem with a kind of exercise 1) There are 2 kind of error ( A and B). A and B are two independent casual variabiles that follow a...

    Started by thessdd‎, 06-25-2008 07:49 AM
    • Replies: 0
    • Views: 2,414
    06-25-2008, 07:49 AM Go to last post
  6. First forum visit ever. Questions

    I'm taking an online statistic course and am having a very hard time with it. I think my biggest problem is setting up the problems. Could someone...

    Started by SunDog‎, 06-23-2008 03:41 PM
    • Replies: 2
    • Views: 5,863
    06-24-2008, 12:05 PM Go to last post
  7. Process Capability

    I am not sure if I am calculating the process capability index correctly. Here is what I have so far. Day No. Defective Bills 1 10 2 9 3 13...

    Started by jessd1013‎, 06-22-2008 10:19 PM
    • Replies: 3
    • Views: 3,494
    06-24-2008, 10:44 AM Go to last post
  8. Probability problem

    Hello everyone, I don't know how to calculate a probability, relating a lotto game. The problem is: if I choose 10 random numbers in a 6/49 game,...

    Started by 0112358‎, 06-23-2008 09:10 AM
    • Replies: 0
    • Views: 5,151
    06-23-2008, 09:10 AM Go to last post
  9. Uniform distribution

    First of all i'm sorry for my english:shakehead ! I'm an Italian logistic engineering student, I've some trouble trying to solve this kind of...

    Started by thessdd‎, 06-20-2008 05:19 AM
    • Replies: 6
    • Views: 6,243
    06-23-2008, 08:24 AM Go to last post
  10. averages and probability

    2. The grades in a course have an average of 72 with a standard deviation of 15. Assume they are normally distributed. a) What score is...

    Started by toronto416‎, 06-20-2008 12:41 PM
    • Replies: 2
    • Views: 2,830
    06-21-2008, 03:07 PM Go to last post
  11. sampling normal distributions

    Hello everyone, I'm a new member to the forum and just wanted to introduce myself. I also have been trying to figure out a homework question, and am...

    Started by toronto416‎, 06-19-2008 11:34 AM
    • Replies: 5
    • Views: 4,306
    06-20-2008, 12:25 PM Go to last post
  12. Probability based on Sample Size

    I have a general idea of the information that I would like to calculate, but my stat skills are extremly rusty. The data I am concerened with is...

    Started by pipestew‎, 06-20-2008 11:36 AM
    • Replies: 0
    • Views: 2,714
    06-20-2008, 11:36 AM Go to last post
  13. Exam Question Probability.

    Pretty straightforward question, I just want to double check what I told a friend. She has 11 exam questions to study for, only 6 of these will be...

    Started by Cohen's monkey‎, 06-17-2008 09:19 PM
    • Replies: 3
    • Views: 5,196
    06-20-2008, 01:36 AM Go to last post
  14. probability question

    I am having trouble with this question: How much would you be willing to pay for tickets to a contest in which there was a 1% chance that you would...

    Started by nuccul1‎, 06-17-2008 11:24 PM
    • Replies: 2
    • Views: 2,551
    06-18-2008, 06:52 AM Go to last post
  15. probability question

    This is probably going to seem so easy to most of you but I cannot remember how to do this problem. In one town 64% of adults have health...

    Started by brandy79‎, 06-17-2008 04:34 PM
    • Replies: 2
    • Views: 2,025
    06-18-2008, 12:07 AM Go to last post
  16. need help with these 2 questions

    a) Profits (denoted as X) 100 normally distributed mean value of 1.5 mi and a (s.d.) of 120,000. Calculate P (X < $1 million) -4.66 is that...

    Started by crashuk‎, 06-09-2008 12:00 AM
    • Replies: 3
    • Views: 3,190
    06-17-2008, 11:46 AM Go to last post
  17. Pub Probability Question

    Hi, We were discussing the following in the pub and its frustrating me because I can't figure out the answer (15 years on from a maths degree), I...

    Started by boro123‎, 06-14-2008 04:38 AM
    • Replies: 3
    • Views: 2,532
    06-17-2008, 11:42 AM Go to last post
  18. Birthday Problem

    I understand the math behind the birthday problem However, intuitively, I don't quite understand why the percentages don't go up linearly? For...

    Started by shrek‎, 06-17-2008 07:55 AM
    • Replies: 1
    • Views: 3,190
    06-17-2008, 11:16 AM Go to last post
  19. Normal Distribution

    This one has me puzzled a bit. Kleerco supplies an under-hood, emissions control air pump to the automotive industry. The pump is vacuum powered...

    Started by jkeelsnc‎, 06-16-2008 11:40 PM
    • Replies: 1
    • Views: 2,944
    06-17-2008, 11:14 AM Go to last post
  20. How to obtain variance estimator

    Suppose we have the following ml estimator for beta beta = (lambda - c(1-lambda)) / p beta and lambda are proportions, c is a constant...

    Started by cylan‎, 06-17-2008 03:55 AM
    • Replies: 0
    • Views: 2,207
    06-17-2008, 03:55 AM Go to last post
  21. Probability and Stat help

    I'm having trouble with my homework, can anyone figure out these problems for me? In a certain community, 35% of the families own a dog, and 20%...

    Started by mikeybao‎, 06-13-2008 08:58 PM
    • Replies: 2
    • Views: 8,815
    06-16-2008, 09:13 PM Go to last post
  22. Credit Card Roulette - Expected Value

    4 people just finished dinner and the bill arrives. The total tab is $100. When paying for the bill what is better (for the individual): (1) split...

    Started by jmmcd‎, 06-16-2008 10:09 AM
    • Replies: 1
    • Views: 4,636
    06-16-2008, 04:08 PM Go to last post
  23. 2 Probability problems

    I am taking statistics at my local community college and am ONLY doing it because it is required for a BSN degree. I am a 4.0 student, but most of my...

    Started by notamathwiz‎, 06-16-2008 11:10 AM
    • Replies: 2
    • Views: 6,137
    06-16-2008, 03:14 PM Go to last post
  24. Red face Probability Problem

    I am stumped on this one a bit. In 2001, the average conventional first mortgage for new single-family homes was $245,000. Assuming a normal...

    Started by jkeelsnc‎, 06-15-2008 10:10 PM
    • Replies: 3
    • Views: 6,232
    06-16-2008, 12:50 PM Go to last post
  25. Red face Standard Normal Distribution

    Here is a question that I am trying to answer for myself. I think I figured out A alright. Anyway, here it is: In the standard normal...

    Started by jkeelsnc‎, 06-13-2008 02:08 PM
    • Replies: 2
    • Views: 15,845
    06-15-2008, 09:58 PM Go to last post
  26. Poisson Probabilities

    Hi, I have the feeling this is a really easy question but am having a mental block at the moment on a past exam paper question so I am hoping that...

    Started by itjaw‎, 06-15-2008 02:14 AM
    • Replies: 3
    • Views: 4,823
    06-15-2008, 04:50 PM Go to last post
  27. Estimate P(F and M) by P(F), P(M)

    Hi guys: I need help from stats experts. First of all I'm working in market research and no longer a student anymore. What I have are projects...

    Started by zli034‎, 06-13-2008 05:09 PM
    • Replies: 2
    • Views: 2,575
    06-13-2008, 09:34 PM Go to last post
  28. Unrealistic to use poission when modeling calls to switchboard?

    Isn't is unrealistic to use a poission distribution when modeling calls to a switchboard within, say, an 1 hour time interval? One of the...

    Started by shrek‎, 06-13-2008 12:06 AM
    • Replies: 2
    • Views: 2,816
    06-13-2008, 04:26 AM Go to last post
  29. Red face variance of probabilities

    A variance is the amount of spread in a distribution, right? I keep coming up with a huge number for the variance and I'm not sure if this number...

    Started by frustratedwstats‎, 10-11-2007 12:41 PM
    • Replies: 4
    • Views: 3,740
    06-13-2008, 01:39 AM Go to last post
  30. Just wanted to make sure my answer was correct Point Estimate

    Treament B Mean=1715 Sum of Squares=61.875 Treatment D Mean=20.125 SS=70.875 Point Estimate= 20.125-14.375=5.75

    Started by heartbeatshurt‎, 06-11-2008 06:03 PM
    • Replies: 0
    • Views: 3,392
    06-11-2008, 06:03 PM Go to last post
  31. Statistics noob here, in need of help!

    I am doing my first stats assignment of the term and there is a question on which I need help. 1. 72% of students have text books. Among the...

    Started by caribou‎, 06-11-2008 10:27 AM
    • Replies: 2
    • Views: 2,315
    06-11-2008, 11:37 AM Go to last post
  32. probability for mortality

    How do I calculate the probability of one patient ending up with kidneycancer when I follow a group of 99 patients over 15 years given that the...

    Started by mpkpo‎, 06-09-2008 02:49 PM
    • Replies: 3
    • Views: 3,978
    06-10-2008, 08:31 PM Go to last post
  33. really hard prob ques==need major help !!!

    Hi guys i really need help on this question, it's so confusing, all help will be greatly appreciated ! =) so here's the question: as part of a...

    Started by angel_eyez88‎, 06-09-2008 12:26 AM
    • Replies: 3
    • Views: 3,226
    06-09-2008, 09:18 PM Go to last post
  34. any help?

    Okay, so I have a problem that I'm experiencing difficulty with and I'm curious if anyone can help me set up the equation for this problem: The...

    Started by gettingheadaches‎, 06-09-2008 07:00 PM
    • Replies: 3
    • Views: 2,044
    06-09-2008, 08:46 PM Go to last post
  35. getting better, but another question

    okay, so thanks to dragan's help, i'm starting to get this stuff, even though i'm still perplexed on the z-score when i'm looking for an answer based...

    Started by saige30‎, 06-09-2008 10:13 AM
    • Replies: 2
    • Views: 2,117
    06-09-2008, 06:51 PM Go to last post
  36. Exclamation where to start?

    Not sure how to start...any help? Motorist insurance company has reviewed their files on bodily injury claims that they've paid out on accidents. ...

    Started by saige30‎, 06-08-2008 08:59 PM
    • Replies: 2
    • Views: 2,544
    06-09-2008, 09:28 AM Go to last post
  37. Probability

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

    Started by Slick‎, 05-14-2008 06:31 AM
    • Replies: 5
    • Views: 3,766
    06-07-2008, 07:31 AM Go to last post
  38. Yikes help!

    There are two boxes, Box A and Box B. • Box A contains seven $1 tags, six $5 tags, four $10 tags, two $15 tags, and one $20 tag. • Box B contains...

    Started by kmulcahy526‎, 06-06-2008 09:05 AM
    • Replies: 0
    • Views: 1,775
    06-06-2008, 09:05 AM Go to last post
  39. Help please.... Find the expectation of the game

    Hi my name is Angela. Can anyone help me with this problem please..... For $4 a person may buy a chance at a raffle. There are 2000 tickets sold....

    Started by abrock2‎, 06-05-2008 03:53 PM
    • Replies: 1
    • Views: 2,454
    06-05-2008, 11:59 PM Go to last post
  40. probability

    Hi My name is Angela. Can anyone help me figure out how to do this problem. I don't know where to begin. An automobile has three factories. A, B,...

    Started by abrock2‎, 06-04-2008 08:05 PM
    • Replies: 1
    • Views: 2,386
    06-05-2008, 11:49 PM Go to last post
  41. Counting question

    Hey, I am not able to find the number of combination when I have 100 varaibles... with 2, I have: AB: A - B - AB = 3 combinations with 3, I...

    Started by Benoit I‎, 06-04-2008 07:35 PM
    • Replies: 2
    • Views: 3,212
    06-04-2008, 08:53 PM Go to last post
  42. Probability Problem

    Pls help...........:wave: My problem exercise goes like this - An employee of the records office at a certain school currently has 10 forms on...

    Started by leo‎, 04-10-2008 08:31 AM
    5 Pages
    1 2 3 ... 5
    • Replies: 74
    • Views: 62,464
    06-04-2008, 07:00 PM Go to last post
  43. Probability Question

    I need help solving this question: P(X^2 > Y) = 0.025 where X^2~X^2(21)

    Started by skyraptor‎, 06-03-2008 07:38 PM
    • Replies: 6
    • Views: 4,170
    06-04-2008, 01:26 PM Go to last post
  44. help with 2 PROBLEMS... THANKS!

    I could use help with these two problems please. 8. Ricardo's car rental offers five different types of vehicles, compact cars (CC), midsize cars...

    Started by waterdog32‎, 06-01-2008 05:04 PM
    • Replies: 3
    • Views: 5,324
    06-03-2008, 04:24 PM Go to last post
  45. Normal Distribution

    I am currently working on this problem: Tire compnay produces tires whose diameters are normally distributed, with mean =36 inches and standard...

    Started by chris900‎, 06-03-2008 11:11 AM
    • Replies: 2
    • Views: 1,772
    06-03-2008, 11:48 AM Go to last post
  46. Golf Probability Again

    This problem is really bothering me cause I can't figure it out at all...so I'm gonna try reposting it if that's ok: Harry is an employee at a...

    Started by DAI&DF‎, 06-02-2008 07:15 AM
    • Replies: 4
    • Views: 1,987
    06-02-2008, 03:44 PM Go to last post
  47. Coin flipping

    A coin is weighted so chances of heads is 0.60 and the chances of tails is 0.40. The coin's tossed six times and the the number of heads out of six...

    Started by StatsH‎, 06-01-2008 08:03 PM
    • Replies: 1
    • Views: 3,247
    06-02-2008, 03:11 AM Go to last post
  48. "Hepatitis" and "Golf" probabilities.

    I'm having some trouble with these... A test for Hepatitis A is 98% accurate: if a person has Hepatitis, the test will come out "positive" with...

    Started by DAI&DF‎, 05-31-2008 11:29 PM
    • Replies: 7
    • Views: 6,727
    06-01-2008, 06:51 PM Go to last post
  49. Card Prob.

    A deck of cards has all the face cards removed - Aces, Kings, Queens, and Jacks. There are 36 left in the deck, if two cards were drawn at the same...

    Started by HikariT‎, 06-01-2008 02:26 PM
    • Replies: 8
    • Views: 3,860
    06-01-2008, 05:24 PM Go to last post
  50. Video Game Probability Stats

    First off, hi! I've never been to this forum, but would like to humbly request help on something a little over my head. 1st problem at hand: ...

    Started by Bugg5287‎, 06-01-2008 01:55 AM
    • Replies: 0
    • Views: 4,278
    06-01-2008, 01:55 AM Go to last post
  51. Probability Question

    Hello, I need help figuring out the results which are based on probability percentages. Let’s say there’s an item which you can brake down into...

    Started by dpg‎, 05-26-2008 12:17 PM
    • Replies: 5
    • Views: 2,680
    05-31-2008, 11:32 AM Go to last post
  52. Probability Question

    I'm having trouble figuring this out. 3 digits are chosen in order from 0, 1, 2 ... 9. What is the probability that first < second < third a)...

    Started by nathan183‎, 05-29-2008 09:25 PM
    • Replies: 6
    • Views: 3,003
    05-30-2008, 11:30 AM Go to last post
  53. Video game equipment

    Hello everyone, My friend has been playing this game called Tabula Rasa, and is trying to make the perfect armor for his character. In order to do...

    Started by chriscj‎, 05-14-2008 03:15 AM
    • Replies: 5
    • Views: 4,640
    05-30-2008, 12:00 AM Go to last post
  54. unknown statistics

    Hi everyone I'm trying to find out what distribution two statistics have and I was wondering if someone could help me out. :) The first statistic...

    Started by sawyer‎, 05-28-2008 12:34 PM
    • Replies: 4
    • Views: 3,036
    05-29-2008, 06:05 PM Go to last post
  55. z-test for a proportion

    Please help... Lets say that I have developed a new method and software prototype that aims to significantly reduce the ambiguity inherent in...

    Started by Steve‎, 05-29-2008 06:59 AM
    • Replies: 1
    • Views: 4,127
    05-29-2008, 07:40 AM Go to last post
  56. Normal Distribution

    How to find a Mean of a specified area (eg Area right side of the mean of distribution) in the normal distribution? Is there any way to do that?

    Started by pgvetrivel‎, 05-24-2008 05:32 AM
    • Replies: 1
    • Views: 2,329
    05-24-2008, 11:46 AM Go to last post
  57. Unhappy Probability and Moment Generating Functions

    Hello, I am terrible when it comes to probability and moment generating functions. I missed 2 lectures this week and I am now completely lost on...

    Started by arguabsysi‎, 05-22-2008 05:16 AM
    • Replies: 5
    • Views: 3,617
    05-22-2008, 02:43 PM Go to last post
  58. What is a moment generating function intuitively?

    I don't understand intuitively what's a moment generating function. Can someone explain intuitively what's a moment generating function? Thanks.

    Started by shrek‎, 05-22-2008 02:20 PM
    • Replies: 0
    • Views: 2,918
    05-22-2008, 02:20 PM Go to last post
  59. Need help getting started on some problems

    I have a worksheet here over my entire semester in stats and some of the problems are from very early in the semester and I can't find a way to even...

    Started by Drew‎, 05-22-2008 12:25 PM
    • Replies: 5
    • Views: 3,877
    05-22-2008, 01:23 PM Go to last post
  60. Probability Confusion

    A sequence of N independent Bernoulli trials is performed, where N in a non-negative integer-valued random variable, and the probability of success...

    Started by woody198403‎, 05-22-2008 05:54 AM
    • Replies: 1
    • Views: 2,500
    05-22-2008, 12:33 PM Go to last post

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