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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: 30,304
    09-30-2005, 09:44 AM Go to last post
  1. 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...

    Started by haywire‎, 01-29-2007 08:46 PM
    • Replies: 1
    • Views: 3,672
    01-31-2007, 06:17 PM Go to last post
  2. Conditional Probability: conditioning on intersection of two events

    Hi, I came across the following probability problem at my job, and would really appreciate any pointers. Let's assume that 70% of the visitors to...

    Started by misenial‎, 04-04-2012 03:59 PM
    • Replies: 1
    • Views: 3,042
    04-05-2012, 02:03 PM Go to last post
  3. Conditional Probability?

    What is the probability on a single roll of a pair of dice, that the sum is 6, given that at least one die came up 1? I'm thinking that there are...

    Started by mathprof‎, 04-12-2014 07:45 PM
    conditional probability, dice
    • Replies: 5
    • Views: 1,676
    04-12-2014, 11:20 PM Go to last post
  4. Conditional Probabillity- Check my work?

    Ok the problem goes like this: A small brewery has two bottling machines A & B. Machine A bottles 75% of all their bottles, and B bottles 25%. One...

    Started by KitsuMathTard‎, 10-12-2008 06:37 PM
    • Replies: 7
    • Views: 3,030
    10-13-2008, 04:49 PM Go to last post
  5. Conditional Variance

    Hi, I have difficulty understanding the definition of conditional variance as: var(X|Y) = E)**2 | Y]. Given the definition of variance of a...

    Started by fifosm‎, 11-09-2014 04:25 PM
    conditional variance
    • Replies: 7
    • Views: 1,882
    12-01-2014, 10:12 AM Go to last post
  6. conditional variance problem

    hi there, not sure on how to approach this problem. I'm a bit lost. how can I show that a rv y which can be expressed a function of rv x, say...

    Started by c2q‎, 09-30-2011 06:51 PM
    • Replies: 0
    • Views: 1,663
    09-30-2011, 06:51 PM Go to last post
  7. Conditionally independent with a Markov chain, please help

    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...

    Started by vijakhara‎, 10-22-2006 04:48 PM
    • Replies: 0
    • Views: 2,607
    10-22-2006, 04:48 PM Go to last post
  8. Conditioning on more than one event

    Lately, I've been studying conditional probability. I'm working with the following theorems: 1. P(A|B)=P(A,B)/P(B) (the comma represents...

    Started by Buckeye‎, 09-06-2016 06:23 AM
    • Replies: 4
    • Views: 1,902
    09-07-2016, 09:58 PM Go to last post
  9. Conditioning on Random Variables?

    Let T be a constant, and let N be a random variable. Suppose {X_1,X_2,...} are independent, and each X_i follows continuous uniform(0,T)...

    Started by kingwinner‎, 11-15-2009 10:38 PM
    • Replies: 5
    • Views: 3,353
    11-17-2009, 10:50 PM Go to last post
  10. Condtional Probability

    edit: got it.

    Started by statsguy‎, 10-23-2010 05:28 PM
    • Replies: 1
    • Views: 1,861
    10-23-2010, 10:31 PM Go to last post
  11. Confidence Help

    I am trying to make some observations from a data set of independent and dependent variables. Using its S and AD Test statistic, the set of natural...

    Started by cisaak‎, 07-25-2012 01:40 PM
    • Replies: 0
    • Views: 1,097
    07-25-2012, 01:40 PM Go to last post
  12. 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...

    Started by ragip‎, 06-21-2006 04:43 AM
    • Replies: 0
    • Views: 2,453
    06-21-2006, 04:43 AM Go to last post
  13. Post Confidence Interval

    Hi all, I am new to this forum and wanted help in calculating Confidence interval (CI) I have 3 possible outcomes with probability of say p1, p2,...

    Started by rockerd‎, 09-23-2010 12:17 AM
    • Replies: 1
    • Views: 2,941
    09-24-2010, 03:13 PM Go to last post
  14. confidence interval

    Hi every one I have problem with this question . please help me if you can A research collected 17 observations of breakdown voltage with...

    Started by calamariss‎, 12-30-2012 03:50 AM
    • Replies: 2
    • Views: 1,673
    12-30-2012, 05:40 AM Go to last post
  15. Confidence Interval and SRS

    Another quick question.... Q: Running Red Lights A survey of licensed drivers inquired about running red lights. One question asked "Of...

    Started by mackerbuddy‎, 11-14-2005 04:29 AM
    • Replies: 1
    • Views: 16,207
    11-14-2005, 09:27 AM Go to last post
  16. confidence interval calculator

    Hello good people. I have a number of websites and would like to know how confident I can be with my click through rate. (clicks/ impressions) ...

    Started by sawa0018‎, 01-13-2011 10:58 AM
    • Replies: 1
    • Views: 4,807
    01-13-2011, 01:18 PM Go to last post
  17. Confidence interval estimate - distribution binomial, variable when positive

    Hi, Here is my situation: I have a sampling of 60 bills on a population of size 2300. On that sampling, 20 have an error, i.e they have been...

    Started by Meli‎, 11-17-2011 02:12 PM
    tobit; binomial;wald test
    • Replies: 2
    • Views: 2,948
    11-18-2011, 02:07 AM Go to last post
  18. Confidence interval for binary data

    Hi, I've got binary data (0 & 1's) which I represent as a average along a variable "speed". E.g. when speed is 5, the data is and I present that by...

    Started by jhnienhuis‎, 07-14-2009 12:03 PM
    • Replies: 0
    • Views: 7,584
    07-14-2009, 12:03 PM Go to last post
  19. Confidence Interval for gamma distribution mean

    Hello I have a same problem which has been irritating me for so long now. The internet was no help so I post it here. If any of you guys have any...

    Started by keyhs‎, 02-26-2013 07:01 AM
    • Replies: 3
    • Views: 17,007
    02-27-2013, 04:07 PM Go to last post
  20. Smile Confidence Interval for N Observations?

    I have a Statistics/Probability question that isn't homework, but a true life example. Some posters on another messageboard are predicting the...

    Started by TigerBomb‎, 10-29-2007 10:00 PM
    • Replies: 0
    • Views: 2,933
    10-29-2007, 10:00 PM Go to last post
  21. confidence interval for variance

    The provincial sales tax (pst) rate vary from province to province. Six of the rates are shown below. 5% 7% 8% 7% 9% 6% Compute a 95% confidence...

    Started by sweetx‎, 11-10-2006 11:52 PM
    • Replies: 5
    • Views: 2,521
    11-15-2006, 09:48 AM Go to last post
  22. Confidence Interval HELP Plz

    Plz Help!!!!!!! I can't figure this out Confidence interval for the population mean: Use of the t distribution A corporation that maintains a...

    Started by wengermel‎, 08-20-2007 05:09 PM
    • Replies: 1
    • Views: 5,033
    08-21-2007, 11:13 AM Go to last post
  23. Confidence Interval homework check if correct

    1. 68.6 I did this by solving for x with this equation .004=1.96(.14/sqroot of x) 2.84.72% I found this by finding zscore for 1.43 which was...

    Started by schoolboy29‎, 10-19-2010 02:11 PM
    • Replies: 5
    • Views: 4,466
    10-19-2010, 04:56 PM Go to last post
  24. Confidence interval, pls help

    Hi could i pls get some help with these questions. I dont want the answer. I would be greatful if someone could even tell me what formula i would...

    Started by sweetlady‎, 11-21-2006 11:20 AM
    • Replies: 2
    • Views: 5,620
    11-21-2006, 04:04 PM Go to last post
  25. Confidence interval?

    I am trying to create intervals in my data such that each interval contains the same number of samples within its bounds. I created a histogram...

    Started by mfurlend‎, 04-10-2011 11:44 PM
    • Replies: 3
    • Views: 3,918
    05-09-2011, 08:49 PM Go to last post
  26. Confidence Intervals

    Hi there, Can anyone help me with this question regarding confidence intervals? Q: 14.6% of New Zealanders identified with Maori ethnicity. For...

    Started by micco13‎, 09-27-2008 12:39 PM
    • Replies: 3
    • Views: 3,181
    09-28-2008, 01:56 PM Go to last post
  27. Question Confidence Intervals

    A survey of 64 random sports viewers revealed that 32 of them watched the football game. Construct a 99% confidence interval estimate for the true...

    Started by lvgirle‎, 11-02-2009 01:13 PM
    • Replies: 1
    • Views: 2,688
    11-02-2009, 08:19 PM Go to last post
  28. Question Confidence Intervals

    Hi I am new to stats and really spending lots of time on concepts which I can build on, I thought I was fairly comfortable with confidence...

    Started by Golf39‎, 12-16-2014 05:53 AM
    • Replies: 5
    • Views: 2,551
    12-19-2014, 03:12 AM Go to last post
  29. Confidence intervals (or regions?) in an opinion poll analysis

    Hi, I have a question about confidence intervals (or regions?) used with opinion poll results. I made a poll with three different possible...

    Started by Finn the Statistician‎, 04-01-2009 04:40 AM
    • Replies: 0
    • Views: 2,022
    04-01-2009, 04:40 AM Go to last post
  30. Confidence Intervals 101

    Hi guys, I have a simple question - at least for some of you. Why do we substitute 0.25 when determining sample size without any prior estimates?

    Started by rhetoricone‎, 04-20-2009 09:21 AM
    • Replies: 0
    • Views: 2,401
    04-20-2009, 09:21 AM Go to last post
  31. Confidence intervals for proportions: approximating a discrete distribution with a co

    I saw on this website http://onlinestatbook.com/2/estimation/proportion_ci.html The following quote about calculating a CI for a proportion: ...

    Started by trinker‎, 02-16-2016 12:32 AM
    confidence interval, proportion
    • Replies: 3
    • Views: 1,653
    02-16-2016, 03:48 PM Go to last post
  32. Confidence Intervals using Most Likely Estimators

    I have data that follows an exponential distribution. I need to find a 95% confidence interval of the following (using the MLE function): 1. The...

    Started by APOCooter‎, 03-18-2012 01:37 PM
    • Replies: 3
    • Views: 1,820
    03-18-2012, 03:37 PM Go to last post
  33. Confidence intervals?

    Hi my questions is this. Using PHstat or by hand set up a 90% confidence interval estimate of the number of days absent. Sample of 25 people....

    Started by el1‎, 04-16-2008 07:03 PM
    • Replies: 2
    • Views: 3,339
    04-18-2008, 08:39 PM Go to last post
  34. confidence level

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

    Started by ka_day‎, 04-29-2007 03:05 PM
    • Replies: 0
    • Views: 3,068
    04-29-2007, 03:05 PM Go to last post
  35. Confidence levels

    Hi, I need to calculate the confidence levels that I have enough staff at any point in time to service up to 6 tills in a supermarket. I have a...

    Started by Pigmy‎, 03-07-2017 02:23 PM
    • Replies: 3
    • Views: 1,944
    03-07-2017, 10:33 PM Go to last post
  36. confidence levels on 2d \chi^2 grid, where the minimum \chi^2 is not near 1.

    Hallo everybody! I have the following problem: I obtained a 2D grid of reduced \Chi^2 fits, where the the minimum \Chi^2 is far from unit (1)....

    Started by Trifonov‎, 12-12-2014 04:38 AM
    • Replies: 0
    • Views: 2,185
    12-12-2014, 04:38 AM Go to last post
  37. Confidence Question?

    I have a question related, I think, to "confidence". The problem I have is when people jump to conclusions based on what appears to be a...

    Started by Hopkins‎, 08-30-2012 04:51 AM
    • Replies: 4
    • Views: 1,574
    08-30-2012, 09:12 AM Go to last post
  38. Confidense interval for population standard deviation

    Here is one I am stuck on...not even sure where to begin. Oh, and it is due in 19 hours ;-) A bank is attempting to improve the perceived customer...

    Started by DryMouse‎, 07-15-2008 10:48 PM
    • Replies: 2
    • Views: 3,869
    07-18-2008, 02:24 PM Go to last post
  39. Confirm my results for me

    1. The police confiscated 500 tablets suspected to contain ecstasy. A sample of 15 tablets were sent to the laboratory for analysis. After getting...

    Started by asterlaw‎, 02-14-2013 02:02 PM
    • Replies: 1
    • Views: 1,619
    02-14-2013, 02:45 PM Go to last post
  40. Confirmation bias.

    Hello. I am interested in confirmation bias. Specifically I am interested in when a hypotheses can be said to be no longer confirmation bias. ...

    Started by Frankfranky‎, 07-15-2016 06:12 AM
    • Replies: 4
    • Views: 1,953
    07-15-2016, 08:57 AM Go to last post
  41. Confirmation: Urgent!

    Hey all, I just wrote my final exam and there were a set of questions I'm not sure I answered correctly: A deck of 52 cards is shuffled, then we...

    Started by jamesmartinn‎, 02-28-2009 07:43 PM
    • Replies: 6
    • Views: 3,022
    02-28-2009, 11:02 PM Go to last post
  42. Confirmation?

    Just wrote an exam, was able to copy down the questions along with my answers. I don't need you to solve them, but just to clarify some things. 1)...

    Started by jamesmartinn‎, 02-13-2009 09:26 AM
    • Replies: 2
    • Views: 2,429
    02-13-2009, 10:17 AM Go to last post
  43. Confusd on procedure

    I have a problem with only the this as a given Find P(Z> -.95). How do I find p...I don't know any other values to plug in or do I just make...

    Started by Kenny101516‎, 11-16-2010 07:47 PM
    • Replies: 1
    • Views: 3,919
    11-16-2010, 08:37 PM Go to last post
  44. Confused about a question!

    I have a question that i'm having a really hard time even starting. The IT department runs 3 redundant computer servers concurrently. For each...

    Started by maggie2‎, 03-22-2006 10:40 AM
    • Replies: 1
    • Views: 2,895
    03-25-2006, 03:33 PM Go to last post
  45. Question Confused About Probability?

    Hey all, I'm currently a stats student and i have run into confusion about some questions pertaining to probability. I have attempted the following...

    Started by Jeff_McD18‎, 01-19-2011 10:26 PM
    probability question
    • Replies: 14
    • Views: 4,684
    01-20-2011, 12:06 PM Go to last post
  46. confused by normal distributions with variance smaller than 1

    Hello, I am currently working with some normal distributions, and got confused by some specific situation where the density function does not look...

    Started by nightlordtw‎, 10-27-2009 10:56 AM
    • Replies: 5
    • Views: 6,708
    10-29-2009, 05:30 AM Go to last post
  47. Confused on total probability formula

    I am very confused on how to apply the total probability formula. If X and Y are two independent continuous random variables with pdfs g(x) and...

    Started by Troopers04‎, 09-10-2009 09:19 AM
    • Replies: 2
    • Views: 4,582
    09-10-2009, 12:08 PM Go to last post
  48. Confused on where to get started

    I've already went through the problems of Pr(z>x) but I'm confused on where to get started on this problem. If Pr(Z>Zo)=.5, what is the cutoff...

    Started by Golobos00‎, 04-04-2011 07:04 PM
    • Replies: 0
    • Views: 2,373
    04-04-2011, 07:04 PM Go to last post
  49. Confused with the Sampling Distribution of p

    Hello all, I really hope that I can get an answer. I've worked the problem out, but I keep going back and forth in my head about the answers....

    Started by kevinoc0‎, 10-25-2011 08:43 PM
    • Replies: 1
    • Views: 2,029
    10-25-2011, 11:29 PM Go to last post
  50. Confusing Problem and Need Help!

    ...........................

    Started by Porter1‎, 11-25-2009 09:27 PM
    • Replies: 0
    • Views: 2,566
    11-25-2009, 09:27 PM Go to last post
  51. Confusing...

    Hi,i want to ask.....(let X=sample mean) 1.what is the prob that the sample mean will be smaller then 100 or larger than 50? so my expression is:...

    Started by ho168‎, 12-21-2010 11:26 AM
    • Replies: 3
    • Views: 5,085
    12-23-2010, 06:56 AM Go to last post
  52. Confusion about binomial and hypergeometric

    I have a question. Let's say only 15 out of 50 job candidates can get the job at a company. (30%) Would an individual prefer sampling WITH...

    Started by rocketscientist82‎, 03-13-2012 11:49 PM
    • Replies: 0
    • Views: 1,219
    03-13-2012, 11:49 PM Go to last post
  53. Confusion over Expected Conditional Value

    I've recently read that for a random variable X, "the expected value of the negative values of X is the expected value of X conditioned on X being...

    Started by ts96‎, 04-23-2009 03:05 PM
    • Replies: 0
    • Views: 2,809
    04-23-2009, 03:05 PM Go to last post
  54. Confusion with distributions..

    I have the following question and I have no idea how to solve it. 3) The population variance of the distribution for X is 100. Two random samples...

    Started by mmmmxx‎, 11-08-2011 12:37 PM
    • Replies: 6
    • Views: 3,305
    11-09-2011, 02:38 AM Go to last post
  55. conjoint analysis

    Hi how i can ask for which situation to use conjoint analysis?

    Started by Kimudao‎, 05-27-2017 11:45 PM
    • Replies: 3
    • Views: 1,044
    06-12-2017, 06:56 AM Go to last post
  56. Conjunction of n hypothesis

    Ciao all, :wave: I have a conjunction of n non-independant hypothesis: h1 and h2 and .... and hn. I want to calculate the probability of...

    Started by aldebaran2‎, 09-13-2007 04:08 AM
    • Replies: 4
    • Views: 3,560
    09-16-2007, 09:38 AM Go to last post
  57. consectutive wins in 10,000 events

    Hello, Thanks in advance for your help. My question is related to probability. I think I know the answer, but I would like confirmation on my...

    Started by Bjorn‎, 08-04-2007 10:29 AM
    • Replies: 1
    • Views: 2,394
    08-13-2007, 03:40 PM Go to last post
  58. Consecutive outcomes of events

    I am trying to figure out the probability for not having consecutive like outcomes from a large sample and can't figure out where to begin. Say...

    Started by paintrain‎, 07-10-2013 08:42 PM
    combinations, probabilistic sampling, probability
    • Replies: 1
    • Views: 1,955
    07-11-2013, 12:08 AM Go to last post
  59. Consequences of choosing the wrong likelihood function...

    hey everyone! just a quicky-quick question here. i think i remember reading somewhere that some of the nice properties of parameter estimates...

    Started by spunky‎, 09-20-2012 02:49 PM
    2 Pages
    1 2
    • Replies: 26
    • Views: 7,577
    09-23-2012, 12:17 PM Go to last post
  60. Considerations in taking on a one-time gamble

    Assuming I'm risk-neutral, how are they different from taking on repeated gambles?

    Started by Outlier‎, 02-18-2010 04:10 PM
    • Replies: 0
    • Views: 2,949
    02-18-2010, 04:10 PM Go to last post

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