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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: 196,702
    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: 66,727
    09-30-2005, 09:44 AM Go to last post
  1. interpreting Kendall's W

    Hello, first of all I want to say that this site is fantastic! I'm very glad I found a site that helps people with statistics problems. I hope you...

    Started by danielle‎, 05-16-2006 06:53 AM
    • Replies: 2
    • Views: 14,913
    02-27-2009, 05:22 AM Go to last post
  2. Critical z value problem

    Need help with this problem Assume that the data has a normal distribution and the number of observations is greater than fifty. Find the...

    Started by maharriso‎, 11-07-2006 12:02 PM
    • Replies: 2
    • Views: 8,192
    02-15-2009, 10:35 AM Go to last post
  3. Smile All basic formulas

    Dear All I have been reading lots of materials here and there, but I was wondering whether anybody had either a document or a link for all basic...

    Started by SylviaS‎, 11-02-2008 06:55 AM
    • Replies: 2
    • Views: 6,556
    01-22-2009, 01:11 AM Go to last post
  4. Nonparametric Stats

    Why do the numbers 3,6, and 12 always appear in nonparametric stats?

    Started by kau888‎, 12-14-2008 03:15 AM
    • Replies: 2
    • Views: 2,819
    12-15-2008, 03:42 AM Go to last post
  5. Please help!!

    In two - way ANOVA, why does the MS carry along the interaction effect in Model II, but not in Model I (i.e. why does the interaction effect (when it...

    Started by kau888‎, 12-18-2008 02:32 AM
    • Replies: 2
    • Views: 2,693
    12-18-2008, 03:42 PM Go to last post
  6. Basic t score question

    Is it ok to have a t-score that is negative? If it is negative, when looking at the t score table do I look at the number as a positive? Thanks

    Started by playbrunson‎, 12-18-2008 08:04 PM
    • Replies: 2
    • Views: 20,246
    12-18-2008, 10:05 PM Go to last post
  7. Sample size for normality tests and transforming data to normal distribution

    hey, im trying to transform a set of biological count data (not normally distributed) into a normal distribution. The data is all similar to the...

    Started by PH89‎, 12-19-2008 04:27 PM
    • Replies: 2
    • Views: 5,847
    12-22-2008, 12:01 AM Go to last post
  8. Non Parametric alternative to a Mixed Measures ANOVA

    Hi All, I am wondering if you can help me out with a problem i am having. Firstly, i have a single between subjects IV (gender) and then two...

    Started by silent_ice81‎, 12-29-2008 04:00 AM
    • Replies: 2
    • Views: 24,255
    12-31-2008, 02:09 AM Go to last post
  9. LSDs when you can't do ANOVA?

    I have a bizarre question, and curious about what other people think. Bear with a bit of an explanation here. My understanding is, if you do a one...

    Started by Ned‎, 01-02-2009 03:52 AM
    • Replies: 2
    • Views: 2,541
    01-04-2009, 11:19 AM Go to last post
  10. Testing a hypothesis

    Hi I think I'm in trouble with a quite simple hypothesis testing. The question is: A company claim that their employees handle 40 orders per...

    Started by Rognis‎, 01-06-2009 01:32 PM
    • Replies: 2
    • Views: 2,011
    01-07-2009, 03:24 AM Go to last post
  11. SPSS Post Hoc Tests

    Hi all Stats enthusiasts! This is my first time as a new user to TalkStats and I'm really excited to get some of your opinions and help. I use...

    Started by emmawilkie83‎, 01-05-2009 07:50 PM
    • Replies: 2
    • Views: 4,826
    01-07-2009, 03:27 AM Go to last post
  12. variance and covariance need to clarify!

    Hi, There is an example in an article where the author calculates variance and covariance, but I can't understand how (I'm novice in the topic). The...

    Started by ArixII‎, 01-11-2009 12:27 PM
    • Replies: 2
    • Views: 2,803
    01-11-2009, 01:12 PM Go to last post
  13. Please need urgent help regarding t-test

    We have a research wherein we need to determine the significant different between the entry and exit assessment. So we utilized the t-test. we were...

    Started by needbadhelp‎, 01-12-2009 04:29 AM
    • Replies: 2
    • Views: 1,948
    01-12-2009, 12:03 PM Go to last post
  14. Method for identification of identical time series needed

    I am looking for a solution to the following problem: There is a pool of about 150 different time series. Each series contains default...

    Started by MHL_AUT‎, 01-12-2009 08:23 AM
    • Replies: 2
    • Views: 2,562
    01-12-2009, 11:55 AM Go to last post
  15. Proper Statistics Test

    This is a problem I ran across at my job. I have ABSOLUTELY no statistics experience so that might explain if this problem is exceedingly simple: ...

    Started by Great_Galois!‎, 01-15-2009 11:26 AM
    • Replies: 2
    • Views: 2,751
    01-28-2009, 03:29 PM Go to last post
  16. Autocorrelation with S-Plus

    Hi, I have a series of data organized by location (x) and test value (y). I want to make an autocorrelation function for those data using S-Plus. Is...

    Started by Faraz‎, 01-15-2009 11:05 PM
    • Replies: 2
    • Views: 3,584
    01-23-2009, 10:33 PM Go to last post
  17. Help on explaining Conflicting F test and t test results!

    Could someone please explain to me how an F test could lead to an insignificant result while a t test lead to significant results. I know the...

    Started by Liz77‎, 01-16-2009 03:59 AM
    • Replies: 2
    • Views: 6,057
    01-16-2009, 10:20 AM Go to last post
  18. showing p-value

    Hello: It has been a while since I visited the forum. I have a problem I would like some input on if anyone is so minded. Suppose a researcher...

    Started by galactus‎, 01-19-2009 06:48 PM
    • Replies: 2
    • Views: 1,657
    01-19-2009, 08:09 PM Go to last post
  19. HELP:: Meaning of LOD score in Genetics Testing

    First, a little bit about how a LOD score is calculated. What you basically do is take the probability of a set of events happening if there is no...

    Started by strav001‎, 01-20-2009 11:58 AM
    • Replies: 2
    • Views: 5,531
    01-21-2009, 01:36 PM Go to last post
  20. What are the most important approaches to statistical decision?

    So far, the criteria of statistical decision I have committed myself to learning are: maximum expected utility, maximum utility under most probable...

    Started by odenskrigare‎, 01-21-2009 12:18 AM
    • Replies: 2
    • Views: 2,309
    01-21-2009, 12:48 AM Go to last post
  21. new to stat.. likert scale and ttest

    hi, i really need help.. how do i analyze the result of a likert scale? i am using a 5pt likert scale and my questions are categorized and each...

    Started by i128‎, 01-22-2009 07:14 AM
    • Replies: 2
    • Views: 2,630
    01-22-2009, 05:22 PM Go to last post
  22. Repeated Measures - unequal time points across groups

    Hi everyone, I need to compare two groups. Group 1 will take drug X for 12 months and Group 2 will take drug X for 8 months. They will be given...

    Started by ceperras‎, 01-22-2009 03:58 PM
    • Replies: 2
    • Views: 4,183
    01-22-2009, 08:44 PM Go to last post
  23. Exclamation frequency table for histogram

    im taking an online statistics course and im stuck. can anyone help?? the chart for the problem is this: DS1 Gender Monthly Income Education...

    Started by itzb0ri‎, 01-22-2009 05:12 PM
    • Replies: 2
    • Views: 2,915
    01-27-2009, 07:29 AM Go to last post
  24. validity of correlation

    Hi, I'm hoping someone can help me with a problem with correlations I've encountered with my research. I use an instrument that gives out 4...

    Started by williaml‎, 01-26-2009 10:14 AM
    • Replies: 2
    • Views: 2,803
    01-27-2009, 01:16 AM Go to last post
  25. Serial correlation

    I executed a regression by using Eviews, the DW stats were about 0.25. It means the presence of serial correlation in errors. Could someone help me...

    Started by cuongnh‎, 01-27-2009 12:03 AM
    • Replies: 2
    • Views: 2,098
    02-01-2009, 07:16 AM Go to last post
  26. Smile Statistical tests for non-normal population

    Hello everyone, My name is Jesse. My background is in pure mathematics and computer science (i.e., lots of discrete math) so statistics falls...

    Started by jfarmer‎, 01-30-2009 08:46 PM
    • Replies: 2
    • Views: 5,404
    01-31-2009, 06:46 PM Go to last post
  27. What test to use?

    Hi I'm doing experiement on the usage of system I deploy. 107 users involve. In the experiment I monitor a usage on the features provided on:...

    Started by nma‎, 01-30-2009 11:32 PM
    • Replies: 2
    • Views: 1,861
    02-04-2009, 04:51 PM Go to last post
  28. Just a wee question..

    Hello!! I am stuck! Stats has never been my strong point, but I have mangaged to get a few tests done using minitab! so fingers crossed that they...

    Started by Humerus‎, 02-02-2009 02:58 PM
    • Replies: 2
    • Views: 1,708
    02-05-2009, 08:59 AM Go to last post
  29. T test/Hypothesis testing homework, NEED help understanding this steps!!

    :shakeheadThis is the assignment I am having difficulty with. I do not simply want the answers, I really want to understand how to do this. It's...

    Started by jrazoux‎, 02-02-2009 08:58 PM
    • Replies: 2
    • Views: 5,955
    02-03-2009, 03:06 PM Go to last post
  30. nonparametric equivalent for a between subjects ANOVA

    Hello, I am currently conducting analysis for a 2x2 independent ANOVA with each independent variable having two levels. I need to conduct a...

    Started by dwatts‎, 02-04-2009 01:52 PM
    • Replies: 2
    • Views: 6,704
    02-04-2009, 02:21 PM Go to last post
  31. Confused Again

    I have to give it in N(mean, standard deviation). I don't even know where to start :(. Maybe I have to compare the percentages and the months to...

    Started by WhoCares357‎, 02-04-2009 08:06 PM
    • Replies: 2
    • Views: 2,880
    02-05-2009, 06:55 AM Go to last post
  32. Exclamation What's the initial value of a(t) in a SARMA models

    Hello,Guys: I've fitted the data into a S-ARIMA(p,d,q)*(P,D,Q) models using R. Where p=1,d=0,q=1; P=0,D=1,Q=1; and the seasonal period S=45. ...

    Started by saji‎, 02-09-2009 06:05 AM
    • Replies: 2
    • Views: 2,603
    02-11-2009, 10:27 PM Go to last post
  33. Understanding the equation to calculate variation

    Hello, I am confused by the equation used to obtain variation. summation of: ((X-bar - Xi)^2)/(n-1) Why do we divide by n-1 and not n? ...

    Started by nickester‎, 02-09-2009 09:46 AM
    • Replies: 2
    • Views: 5,140
    02-09-2009, 10:24 AM Go to last post
  34. Comparing two groups of percentages

    Hello! First a bit of background: I am trying to compare the performance of two groups of people (A and B) on various simple tasks that require...

    Started by Thorr‎, 02-11-2009 12:01 PM
    • Replies: 2
    • Views: 8,944
    02-12-2009, 05:01 AM Go to last post
  35. Confidence Interval Gamma Dist

    Does anyone knows the equation for the Confidence Interval of a Gamma Distribution?

    Started by GGKING99‎, 02-14-2009 03:05 PM
    • Replies: 2
    • Views: 6,625
    02-16-2009, 01:20 PM Go to last post
  36. Interpreting Mann Whitney in VASSAR

    Hi, I was wondering if somebody could please help me with interpreting the output of Mann Whitney in VASSAR, as I am used to using SPSS, and the...

    Started by Lene‎, 02-16-2009 03:40 AM
    • Replies: 2
    • Views: 2,844
    02-20-2009, 01:50 AM Go to last post
  37. Intra oberservation

    Hi there, I am have measured 100 different things 3 times each and got different measurements each time. I have tried to research intra...

    Started by Humerus‎, 02-17-2009 10:46 AM
    • Replies: 2
    • Views: 2,742
    02-20-2009, 10:47 AM Go to last post
  38. Interaction Effect

    Hi, I am using a 2 x 2 WS Anova. Here's some background Info- IV #1 - 2 levels IV # 2 - 2 levels DV - response time Main effect of IV 1 -...

    Started by speechy‎, 02-19-2009 05:05 PM
    • Replies: 2
    • Views: 2,547
    02-20-2009, 02:06 PM Go to last post
  39. 2-way ANOVA variable problem..

    Hi, if anybody has any suggestions please let me know, myself and my dissertation partner cannot figure this out! So, we have two independent groups...

    Started by lauramckernan‎, 02-20-2009 08:19 AM
    • Replies: 2
    • Views: 2,098
    02-23-2009, 05:56 AM Go to last post
  40. graphs to represent data

    Hello, I have IQ scores for 2 matched-sample groups (exposure to stimulating music before the testing and no exposure) and the n for each group is...

    Started by zxcvbnm‎, 02-21-2009 04:20 PM
    • Replies: 2
    • Views: 2,279
    02-24-2009, 01:30 AM Go to last post
  41. Likert data question

    I am a student who has administered an attitude survey on a 5-point Likert scale to students at two different colleges in the same sport. First, I...

    Started by samstu4562‎, 02-22-2009 08:36 PM
    • Replies: 2
    • Views: 3,404
    02-26-2009, 04:16 AM Go to last post
  42. Red face Probabilities...need help

    A student government states that 80% of all favor an increase in student sample to subsidize a new recreational area. a random sample of n=25...

    Started by SUNSHINE09‎, 02-23-2009 02:30 PM
    • Replies: 2
    • Views: 2,808
    02-24-2009, 06:04 AM Go to last post
  43. Question Interactions post hoc tests

    Hi all. I'm currently doing a project for my Psychology degree in which I have to write a Results and Discussion section to a given Introduction...

    Started by miekharper‎, 02-24-2009 05:08 PM
    • Replies: 2
    • Views: 3,431
    03-04-2009, 09:18 AM Go to last post
  44. New to Stats - normal distribution question

    Hi all, I am analysing some data. I have collected data from 15 subjects, giving a preference score for how good a piece of music sounds in a...

    Started by johnsmith09‎, 02-26-2009 11:21 AM
    • Replies: 2
    • Views: 3,126
    02-26-2009, 10:26 PM Go to last post
  45. Normal Distribution help please

    Hello, I am stuck with how to create a table/graph for the following problem: According to Investment Digest ("Diversification and the...

    Started by craklnpoprocks‎, 02-28-2009 01:23 PM
    • Replies: 2
    • Views: 3,105
    03-16-2009, 11:50 AM Go to last post
  46. Delta Method

    I am a clinician grappling with statistics! I have attached a question and my answer relating to application of the Delta Method for finding the...

    Started by rob c‎, 02-28-2009 09:50 PM
    • Replies: 2
    • Views: 3,334
    03-01-2009, 05:01 AM Go to last post
  47. probability..i think i have the right idea..help

    The avg lenght of time required to complete a college acheivment test was found to be equal 70 min with a standard diviation of 12 min. when should...

    Started by SUNSHINE09‎, 03-01-2009 10:25 PM
    • Replies: 2
    • Views: 2,094
    03-01-2009, 11:35 PM Go to last post
  48. comparing different sample sizes

    I need to carry out an independent samples t-test, but the samples are of different sizes (12 & 14), do I need to carry out a non parametric...

    Started by lou_be‎, 03-02-2009 12:45 PM
    • Replies: 2
    • Views: 8,152
    03-02-2009, 03:46 PM Go to last post
  49. How can I remove a right/left skew from a data distribution?

    What kind of transformation will remove a right skew or a left skew from a distribution of data?

    Started by Giacomo‎, 03-02-2009 03:23 PM
    • Replies: 2
    • Views: 17,807
    03-03-2009, 02:03 PM Go to last post
  50. Proving statistically beyond a reasonable doubt?

    If I toss a 12-sided die 112 times, what are the chances of any number coming up 32 times... and any number not coming up at all? Can we assume...

    Started by dave925‎, 03-03-2009 07:33 PM
    • Replies: 2
    • Views: 3,498
    03-04-2009, 12:15 AM Go to last post
  51. Factor Analysis - eigenvalues

    I was just wondering whether it is true that factor values are the eigenvalues of the factors? Thanks very much for your help!

    Started by Doublebecca‎, 03-04-2009 11:26 AM
    • Replies: 2
    • Views: 3,997
    03-04-2009, 12:31 PM Go to last post
  52. Im stuck on confidence interval

    :( Please help. Im trying to figure this out and no go. Q: A pharmaceutical company analyses a specimen from each batch of pain reliever to verify...

    Started by sweetx‎, 03-05-2009 11:51 AM
    • Replies: 2
    • Views: 1,668
    03-06-2009, 10:27 AM Go to last post
  53. Probability

    "..58% of all families eat turkey at holiday meals, 44% eat ham, and 16% have both turkey and ham to eat at holiday meals." What is the...

    Started by WhoCares357‎, 03-05-2009 04:49 PM
    • Replies: 2
    • Views: 1,853
    03-06-2009, 04:32 PM Go to last post
  54. Why Finite Population Correction Factor is (N-n)/(N-1)

    When I read Stephen's Schaum's Outline of Theory and Problems of Elements of Statistics, in 13.10, it said : I just wanna know how to prove it...

    Started by wOOL‎, 03-06-2009 11:01 AM
    • Replies: 2
    • Views: 17,151
    03-07-2009, 10:05 AM Go to last post
  55. Excel Help

    So, I miss one day of class to go visit my fiance's AF recruiter and now I'm behind two homework assignments. I've got a professor who doesn't really...

    Started by utkstudent‎, 03-07-2009 11:54 AM
    • Replies: 2
    • Views: 2,825
    03-07-2009, 12:44 PM Go to last post
    • Replies: 2
    • Views: 2,200
    03-07-2009, 07:23 PM Go to last post
  56. regression on censored data

    Hi everyone. I am trying to do statistical analysis on censored data. I have paired data: for each stream flow measurement I have a bacteria count...

    Started by ariklee‎, 03-11-2009 05:15 PM
    • Replies: 2
    • Views: 2,673
    03-11-2009, 05:50 PM Go to last post
  57. help with critical value approach

    hi all, having a problem with my stats assignment, using critcal value approach, conduct an appropriate test at significantt level of 0.05 to...

    Started by jasmint1019‎, 03-14-2009 08:33 PM
    • Replies: 2
    • Views: 3,342
    03-14-2009, 09:23 PM Go to last post
  58. Advantages to using Ratios

    What are the advantages to using ratios to analyze your results? What could be some possible disadvantages? Thanks. -Links

    Started by links0311‎, 03-14-2009 09:53 PM
    • Replies: 2
    • Views: 6,177
    03-15-2009, 10:19 AM Go to last post
  59. Rounding in statistics

    I am pretty new to statistics and I keep making silly mistakes with the rounding rules. I have been asked to round a few numbers off to 2 decimal...

    Started by blahh‎, 03-19-2009 01:02 AM
    • Replies: 2
    • Views: 3,186
    03-19-2009, 01:34 AM Go to last post

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