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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. Sticky Thread Sticky: Forum Guidelines: Smart posting behavior pays off

    Welcome to talkstats.com, the place for statistics help. This is a guideline for people who want to ask a question on this forum and value a...

    Started by TheEcologist‎, 11-27-2010 12:13 PM
    • Replies: 1
    • Views: 197,230
    07-16-2014, 11:01 AM Go to last post
  2. 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: 66,999
    09-30-2005, 09:44 AM Go to last post
  1. Smile Difficult statistical problem; PLEASE HELP

    Hi! For my master thesis I need to do a lot of statistics: I have done behavioural and acoustic research on a group of 8 captive dolphins. A...

    Started by Maaike‎, 02-06-2007 05:56 AM
    • Replies: 0
    • Views: 2,140
    02-06-2007, 05:56 AM Go to last post
  2. Smile Difficult statistical problem; PLEASE HELP

    Hi! For my master thesis I need to do a lot of statistics: I have done behavioural and acoustic research on a group of 8 captive dolphins. A...

    Started by Maaike‎, 02-06-2007 05:54 AM
    • Replies: 0
    • Views: 1,719
    02-06-2007, 05:54 AM Go to last post
  3. homework help

    I have to conduct a mann whitney test but i have a small amount of data, it keeps telling not enough data. Help please kala:shakehead

    Started by kala1408‎, 02-05-2007 03:15 PM
    • Replies: 0
    • Views: 2,887
    02-05-2007, 03:15 PM Go to last post
  4. variance in regression

    Hi, Can someone help me fugure this out regarding simple linear regression. Firstly B is beta and A is alpha We are told that y = A + Bx + e...

    Started by PeterVincent‎, 02-05-2007 12:50 PM
    • Replies: 0
    • Views: 5,019
    02-05-2007, 12:50 PM Go to last post
  5. standard error of ratio of coefficients

    hi all, I am interested in the ratio of two regression coefficients. Is it possible to obtain a standard error for such a ratio? eg: I...

    Started by dragonflyFZX‎, 02-01-2007 08:07 AM
    • Replies: 2
    • Views: 11,089
    02-05-2007, 12:48 AM Go to last post
  6. Sample variance s^2?

    Can anyone give me a definitive description of s^2, sigma^2 and sxx for regression? I know that we can obtain an estimate of the true population...

    Started by Statstastic‎, 02-04-2007 09:07 AM
    • Replies: 1
    • Views: 3,961
    02-05-2007, 12:30 AM Go to last post
  7. Red face non-parametric

    Help please I need to provide a non parametric test with two independant samples the wilcoxon is the wrong test and there is not enough data for...

    Started by kala1408‎, 02-03-2007 09:07 AM
    • Replies: 2
    • Views: 2,681
    02-04-2007, 07:37 AM Go to last post
  8. Uncertainty analysis

    Hello everybody, I'm not sure whether this is the right place to ask, but I will try my luck here. This question concerns uncertainty...

    Started by ricky‎, 02-04-2007 04:33 AM
    • Replies: 0
    • Views: 2,339
    02-04-2007, 04:33 AM Go to last post
  9. not sure what to do! multiple DVs

    Hi there I have a data set which includes 6 continuous DVs (job satisfaction, 3 different kinds of commitment and work-life conflict) and 1...

    Started by thornc‎, 02-03-2007 06:54 PM
    • Replies: 0
    • Views: 1,575
    02-03-2007, 06:54 PM Go to last post
  10. Estimating Proportions

    Does anyone know any good sites fro explaining estimating proportions? I am clueless as to how to do this. My notes are not helping me. Is there a...

    Started by cannoli‎, 01-25-2007 12:05 PM
    • Replies: 2
    • Views: 2,439
    02-02-2007, 09:51 PM Go to last post
  11. Standard deviation for a binomial distribution

    There are N boxes which can be empty or filled with balls. The probability of filling each box with a ball is p. According to binomial...

    Started by pierre.fasciola‎, 02-02-2007 09:39 PM
    • Replies: 0
    • Views: 1,777
    02-02-2007, 09:39 PM Go to last post
  12. Contingency Tables

    I am doing AS Level Statistics, i just finished S1 and started doing S2 however, my teacher is not that experienced at teaching A level, so...

    Started by aadd‎, 02-01-2007 03:12 PM
    • Replies: 1
    • Views: 5,986
    02-01-2007, 11:04 PM Go to last post
  13. Question calculating means and standard deviation from confidence interval

    Is there anyway to calculate mean and standard deviation if we are given the 95% confidence interval? I have the following interval 1.339-13.833 I...

    Started by Katherine‎, 01-30-2007 04:47 PM
    • Replies: 2
    • Views: 57,172
    01-31-2007, 05:53 PM Go to last post
  14. Principal Components Analysis

    Can somebody confirm whether the variables used in a Principal Components Analysis, such as on SPSS, ALL need to be interval level? I have 2...

    Started by Laura‎, 01-18-2007 01:13 PM
    • Replies: 1
    • Views: 4,568
    01-31-2007, 10:24 AM Go to last post
  15. Measure of representativeness

    Suppose I have State | Sample | Population s1 | n1 | N1 s2 | n2 | N2 .. | .. | .. Is the correlation between (n1 n2 ..) and (N1 N2 ..) a...

    Started by diodoo‎, 01-31-2007 06:25 AM
    • Replies: 0
    • Views: 3,491
    01-31-2007, 06:25 AM Go to last post
  16. Help Please Binomial Probability Distribution

    Help Please Binomial Probability Distribution I am given this problem 72% of americans have online access Out of a sample of 30 people

    Started by sgtshep‎, 01-28-2007 04:42 PM
    • Replies: 1
    • Views: 2,314
    01-30-2007, 09:59 PM Go to last post
  17. Question Expecteation and population mean

    Can someone out there assist me to understand if there exist any difference between Expectation EX and Population mean "mu". I have completely lost...

    Started by leon kale‎, 01-28-2007 03:10 PM
    • Replies: 3
    • Views: 2,328
    01-30-2007, 06:47 PM Go to last post
  18. Question Calculating mean/sd from Chi squared for power analysis

    I am working on a project which utilizes several research articles in my field. The first one does not report means and standard deviations, only chi...

    Started by Katherine‎, 01-30-2007 02:42 PM
    • Replies: 0
    • Views: 3,774
    01-30-2007, 02:42 PM Go to last post
  19. how to derive following solution for uniform distributions?

    Hi, I have the following situation. In a rectangular cartesian coordinate of length L and breadth B, you choose any two points randomly (i.e. you...

    Started by yakrider‎, 01-26-2007 08:00 PM
    • Replies: 3
    • Views: 4,531
    01-30-2007, 11:17 AM Go to last post
  20. Significance

    Hello, I am very happy to have found this disucssion board, and I am hoping that you folks can help me! I am the founder of a research project...

    Started by rbottner‎, 01-28-2007 09:11 PM
    • Replies: 2
    • Views: 4,756
    01-29-2007, 11:02 PM Go to last post
  21. Linear vs. Quadratic in Comparisons - Why?

    Hello, I have a set of data for the level of antioxidants in tea, with two variables (water temperature of either 70 or 90 degrees, and steeping...

    Started by junglerat2‎, 01-21-2007 12:28 AM
    • Replies: 2
    • Views: 11,073
    01-29-2007, 09:16 PM Go to last post
  22. Parametric or Non-parametric Analysis with z-scores?

    I last took a stats course in 1999, and I could use some help in remember options available for an analysis of z-scores. I have z-scores on 4...

    Started by colorfulbouquet‎, 01-28-2007 09:58 PM
    • Replies: 0
    • Views: 5,130
    01-28-2007, 09:58 PM Go to last post
  23. Question ramdomness of two independent samples

    Hello! Ive two small and independent samples and i need to confirm that they are random (one of the assumptions on the mann-whitney test), the only...

    Started by Marga‎, 01-19-2007 04:02 PM
    • Replies: 2
    • Views: 1,929
    01-28-2007, 05:42 PM Go to last post
  24. urgent help needed with assignment

    Hi guys I am in urgent need of some help with a question for an assignment due in a few hours. It involves using minitab. It goes as follows: ...

    Started by stephen_patt‎, 01-28-2007 04:43 PM
    • Replies: 1
    • Views: 2,937
    01-28-2007, 05:01 PM Go to last post
  25. Approximating the mean and standard deviation

    Hi, I just started my statistics class and I've been having a little trouple grasping it. I just don't know where to start with this and my book is...

    Started by recipient‎, 01-28-2007 04:34 PM
    • Replies: 0
    • Views: 5,465
    01-28-2007, 04:34 PM Go to last post
  26. Help with question

    The Food and Nutrition Board of National Acadamy of Sciences states that reccomended daily allowance (RDA) of iron for adult females under the age of...

    Started by kyle86‎, 01-28-2007 02:07 PM
    • Replies: 1
    • Views: 2,359
    01-28-2007, 03:27 PM Go to last post
  27. Smile RARE EVENTS -- Poisson / Binomial -- Need Help

    Any help with the problem below is greatly appreciated. :wave: I have 100 days of observations of a geyser. In those 100 days, the geyser shot...

    Started by jchen123456789‎, 01-27-2007 04:30 PM
    • Replies: 2
    • Views: 3,266
    01-28-2007, 02:57 PM Go to last post
  28. Confidence Interval Question

    I have to find a 90% confidence interval for a mean, and i'm only given the S and the x-bar for a sample population of 60. How do I find the t* for...

    Started by kyle86‎, 01-28-2007 02:03 PM
    • Replies: 1
    • Views: 4,241
    01-28-2007, 02:27 PM Go to last post
  29. hypothesis testing

    I need help learning this. I know how to come up with the null and alternative statements but i don't know how to determine which one is the the...

    Started by FB99‎, 01-28-2007 11:12 AM
    • Replies: 1
    • Views: 9,361
    01-28-2007, 11:24 AM Go to last post
  30. Exclamation Help With My Homework!

    I need help with a problem... I am trying to find the t* value by calculating the upper tail probability p I have 37 degrees of freedom and a...

    Started by ming_dynasty1369‎, 01-27-2007 10:07 PM
    • Replies: 2
    • Views: 4,558
    01-28-2007, 07:34 AM Go to last post
  31. Help!

    Hi, I'm currently undergoing a project whereby I have approximately 1200 data cases. I have a number of independent variables and I would like to...

    Started by craigtomk‎, 01-24-2007 04:22 PM
    • Replies: 1
    • Views: 1,988
    01-27-2007, 06:30 PM Go to last post
  32. to mix or not to mix?

    Hi, I am running a learning experiment in which both training subjects and controls complete a pretest and posttest. All analyses are being ...

    Started by dan‎, 01-24-2007 10:27 AM
    • Replies: 1
    • Views: 2,326
    01-27-2007, 06:27 PM Go to last post
  33. Multivariate Regressions

    I have temperature data from two different sites, and I want to develop a relationship for temperature between those two sites. In that way, if I...

    Started by mathias1979‎, 01-23-2007 03:15 PM
    • Replies: 1
    • Views: 2,268
    01-27-2007, 06:13 PM Go to last post
  34. Awerage growth rate (3 years) - which method?

    Hello! I am intending to perform independent samples T Test, between two groups of companies in comparing average annual growth rate in years...

    Started by ynos‎, 01-21-2007 08:30 PM
    • Replies: 1
    • Views: 2,700
    01-27-2007, 06:02 PM Go to last post
  35. Unhappy Help please - in middle of brain me***own!!

    I am putting together a my research proposal on Chinese Herbs (as you can already see, statistics and I do not have much in common!). I have plowed...

    Started by Lavina‎, 01-20-2007 12:31 PM
    • Replies: 1
    • Views: 2,816
    01-27-2007, 09:28 AM Go to last post
  36. how to prove E(Σei^)=ΣE(yi^)-E(Σyihat^)

    this formula looks simple but i really don't know how to explain mathmatically E(Σei^)=ΣE(yi^)-E i tried putting E(Σei^)=E but then don;t know how...

    Started by azuresky‎, 01-26-2007 12:52 AM
    • Replies: 1
    • Views: 21,069
    01-27-2007, 02:17 AM Go to last post
  37. cdf

    can anyone help me with a cdf question?

    Started by helpme‎, 01-24-2007 01:16 AM
    • Replies: 1
    • Views: 2,337
    01-27-2007, 01:32 AM Go to last post
  38. Classification of Insects (How to develop a method?)

    I've been trying this Moody's Mega Math Challenge sample problem, but I don't quite know where to begin. I only have experience in Statistics up to...

    Started by Staplerkid‎, 01-26-2007 03:41 PM
    • Replies: 0
    • Views: 2,663
    01-26-2007, 03:41 PM Go to last post
  39. solution

    does anyone know how to get hold of the solution manual for textbook "Engineering Statistics" 3rd edition by Montgomery

    Started by helpme‎, 01-24-2007 01:24 AM
    • Replies: 0
    • Views: 2,670
    01-24-2007, 01:24 AM Go to last post
  40. Multinomial problem

    I have five possible values (1-5) that are to be applied to categories regarding the likelihood, severity, etc, of systems problem events. There are...

    Started by vangogh228‎, 01-22-2007 09:53 AM
    • Replies: 0
    • Views: 2,018
    01-22-2007, 09:53 AM Go to last post
  41. Sample Variance DISASTER

    :confused: I'm at my wits end i, for some reason, cannot at all get this formula in my text to work...PLEASE anyone who can help i need to...

    Started by MathInept‎, 01-21-2007 05:34 PM
    • Replies: 1
    • Views: 2,343
    01-21-2007, 05:58 PM Go to last post
  42. Unweighted and Weighted Data (Chi Square)

    Here's my situation: I have a dataset with unweighted data taken from a small, annual survey. I also have a large dataset with weighted and...

    Started by ambermrichardson‎, 01-19-2007 08:38 AM
    • Replies: 0
    • Views: 7,237
    01-19-2007, 08:38 AM Go to last post
  43. Hierarchical Regression assumptions

    In my study, i would like to use hierachical regression, but I can't find a proper book on the assumptions that should be met. Is is true that the...

    Started by Noblesse‎, 01-17-2007 10:44 AM
    • Replies: 2
    • Views: 5,434
    01-19-2007, 04:36 AM Go to last post
  44. Which technique is best?

    Hi, i'm final year undergrad student and have been stuck for quite a while now. I have been provided with data on the girth measurements from 12...

    Started by Lajanke‎, 01-19-2007 12:08 AM
    • Replies: 0
    • Views: 2,374
    01-19-2007, 12:08 AM Go to last post
  45. Histograms

    Hi all, I'm trying to determine a cut-off for my data using a histogram - but my question is what is the correct way of setting bin sizes? ...

    Started by qstn‎, 01-18-2007 02:05 PM
    • Replies: 0
    • Views: 1,999
    01-18-2007, 02:05 PM Go to last post
  46. clustrig

    Hai i am a pg student please explain the hirarical clustring-Aglomeritive methods thank you

    Started by ebyjoseph‎, 01-12-2007 05:37 AM
    • Replies: 1
    • Views: 2,830
    01-18-2007, 09:23 AM Go to last post
  47. testing my Pearson

    Hi there.. I just registered because I'm becoming desperate and I hope someone will know an answer to this one.. :) I'll make this more picturesque....

    Started by miracidij‎, 01-18-2007 06:43 AM
    • Replies: 0
    • Views: 2,671
    01-18-2007, 06:43 AM Go to last post
  48. Cool Great data but not sure what to do with it?

    Hi- I've got 25 questions, each with 6 variables in each. I want to compare 2 groups (expert v novice) on each of these questions and within each...

    Started by lyn‎, 01-16-2007 10:17 AM
    • Replies: 4
    • Views: 2,613
    01-18-2007, 05:04 AM Go to last post
  49. To ANOVA or not to ANOVA

    That is the question. I am PhD student preparing my proposal for submittal this week, and I am still tossing around which data analysis method to...

    Started by gyebj‎, 01-17-2007 02:39 AM
    • Replies: 2
    • Views: 3,070
    01-17-2007, 07:37 PM Go to last post
  50. sampling distribution

    i have been trying to do this for while, but couldnt figure out how. AUTO ACCIDENTS A study of rush hour traffic in San Francisco counts the...

    Started by annabananaa‎, 01-13-2007 07:54 PM
    • Replies: 3
    • Views: 9,707
    01-17-2007, 05:48 PM Go to last post
  51. Statistical analysis Survey advice Please

    Hi, I am an adult student struggling with the following: Background: A Survey of Analysts, who are used as representatives of investors in the...

    Started by ClayNZUK‎, 01-17-2007 10:21 AM
    • Replies: 1
    • Views: 3,522
    01-17-2007, 10:55 AM Go to last post
  52. ANOVA vs. t-test

    Dear Stats talkers, What's your answer to the question when to use a t-test vs. analysis of variance? Could you also give an example case for...

    Started by jaregi‎, 01-17-2007 06:16 AM
    • Replies: 2
    • Views: 6,887
    01-17-2007, 07:26 AM Go to last post
  53. Need help to this statistic question

    what are the criteria for a good measure of spread?

    Started by jekiebackie‎, 01-17-2007 12:53 AM
    • Replies: 0
    • Views: 2,689
    01-17-2007, 12:53 AM Go to last post
  54. is Chi squared appropriate here?

    Hi, I have some survey results which I have compiled into a crosstabulation (9x4)using SPSS. I was intending to use chi squared analysis to...

    Started by snorkelsnot‎, 01-13-2007 11:02 PM
    • Replies: 3
    • Views: 2,158
    01-16-2007, 10:36 PM Go to last post
  55. circular statistics with weight?

    Hi all, I have a dataset that describes groups of 2-D linear features. Each group is a collection of angles (orientations) and lengths describing...

    Started by neta_wechsler‎, 01-10-2007 07:23 PM
    • Replies: 1
    • Views: 2,752
    01-16-2007, 06:20 PM Go to last post
  56. Statistics problems with genetic analysis

    hi everyone, I'm having a bit of trouble trying to find out what to do with some results I've got in my research project. I've found 2 different...

    Started by rodpck‎, 01-12-2007 01:42 PM
    • Replies: 1
    • Views: 2,561
    01-16-2007, 06:08 PM Go to last post
  57. Question Paired data or not...

    Hi I'm conducting an investigation into daily water use at an establishment before and after water saving devices were installed. We have...

    Started by enviroquestions‎, 01-16-2007 04:47 PM
    • Replies: 1
    • Views: 2,604
    01-16-2007, 05:42 PM Go to last post
  58. Likert Survey

    I have designed a Likert Survey (5 points) that pertains to classroom management. I am trying to analyze the classroom management style of high...

    Started by c1952l‎, 01-16-2007 10:59 AM
    • Replies: 0
    • Views: 3,274
    01-16-2007, 10:59 AM Go to last post
  59. Survey Project I NEED HELP PLEASE Today

    Develop A Question to ask in a survey, determine the variables, determine the population, determine which type of sampling you will use, think of a...

    Started by rell_low‎, 01-15-2007 12:29 PM
    • Replies: 0
    • Views: 1,948
    01-15-2007, 12:29 PM Go to last post
  60. Durbin Watson

    Hi, I am new here and I am a second year university student studying economics. Any help here would be great and I thank-you in advance. I am...

    Started by Drazit‎, 01-12-2007 06:07 AM
    • Replies: 2
    • Views: 3,175
    01-13-2007, 09:57 AM Go to last post

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