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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: 196,824
    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: 66,794
    09-30-2005, 09:44 AM Go to last post
  1. Probability that sample mean is within the 1 unit of population mean?

    Hello People, I am currently working on the following question: "A sample A is taken from the population. It is of size n1. Calculate the...

    Started by mmmmxx‎, 11-13-2011 04:50 PM
    • Replies: 8
    • Views: 14,939
    11-13-2011, 05:42 PM Go to last post
  2. 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: 14,931
    02-27-2009, 05:22 AM Go to last post
  3. Deciphering linear, nonlinear and random relationships from scatter plots

    Hello All!! This may sound not so bright and I hope none are too badly offended, but I can't for the life of me figure out if my hunches about...

    Started by soon-to-grad‎, 12-03-2008 08:08 PM
    • Replies: 4
    • Views: 14,900
    12-04-2008, 07:34 PM Go to last post
  4. Pretest-Posttest Data Analysis....Help needed urgently

    My research topic is based on comparison of the Effects of Traditional and Modern teaching techniques on Students’ Attitude and Achievement in...

    Started by indicastats‎, 09-20-2011 03:05 AM
    • Replies: 9
    • Views: 14,871
    10-11-2011, 10:43 AM Go to last post
  5. Multiple Imputation or FIML

    Hey guys and gals. I'm having a problem completing a project. I have some survey data and my project is addressing the missing data. It's likert...

    Started by krytellan‎, 04-18-2011 01:15 AM
    • Replies: 3
    • Views: 14,831
    04-21-2011, 01:31 AM Go to last post
  6. Fligner test vs Bartlett test for homoscedasticity

    Hi all, I have an unexpected difference from the tests on homoscedasticity of the data performed with Fligner and Bartlett- In one case I get...

    Started by frodo.jedi‎, 06-09-2010 07:10 PM
    • Replies: 4
    • Views: 14,829
    06-10-2010, 11:29 AM Go to last post
  7. Question How to calculate composite scores?

    Hi everyone, I know it's a bit embarassing to ask this question, but I hope someone can help :o I conducted a survey using four different...

    Started by Illyria‎, 06-11-2008 06:58 AM
    • Replies: 2
    • Views: 14,824
    06-13-2008, 01:35 PM Go to last post
  8. Find standard deviation when there is no specific data

    It is said, In order to profitably manufacture a product, you determine that you must have a scrap rate no greater than 5%. In other words, at...

    Started by sukaloop‎, 02-01-2012 06:21 PM
    • Replies: 5
    • Views: 14,814
    04-01-2012, 08:59 PM Go to last post
  9. derive R squared

    For my econometrics class I have been asked to derive the R squared formula. Now I know the formula for R 2 1- sum of sq error/total sum of...

    Started by lgd632‎, 10-01-2009 10:15 AM
    • Replies: 6
    • Views: 14,809
    10-04-2009, 07:24 PM Go to last post
  10. Non-significant Omnibus F with significant Post-hoc

    In a 2x2 ANOVA with 2 levels for each of the IV's (example: gender-M/F and handedness-Left/Right): I get a non-significant omnibus F in a model...

    Started by gravitykiller‎, 05-10-2010 11:18 PM
    • Replies: 9
    • Views: 14,794
    06-15-2010, 04:32 PM Go to last post
  11. Angry Help with constructing a confidence interval

    I'm taking an online stats class (probably a mistake but I'm going to make it). I have a question that I can't figure out because the help assistant...

    Started by bluehorseshoe33‎, 08-10-2008 11:29 AM
    • Replies: 2
    • Views: 14,784
    08-11-2008, 03:22 PM Go to last post
  12. How to combine single Likert items into one scale? (Time-sensitiv)

    Hello, I have a very time-sensitive question: I am replicating a theory that uses 12 Likert items to measure three latent variables (4 items...

    Started by FlorianBoom‎, 07-30-2011 04:58 PM
    liker scale, likert, scale, scale development
    • Replies: 6
    • Views: 14,730
    07-31-2011, 02:24 PM Go to last post
  13. How to read F test table?

    For the table http://www.stattools.net/FTest_Tab.php How do I read it? What is numerator degrees of freedom and denominator degrees of...

    Started by david_q‎, 02-15-2012 07:53 AM
    • Replies: 3
    • Views: 14,667
    02-15-2012, 01:41 PM Go to last post
  14. Assumption when using the mean and median

    Hi, When I use the mean or the median on a set of data am I making any assumptions about the distribution of the data? Can I effectively use them...

    Started by Statstastic‎, 09-22-2009 03:30 AM
    • Replies: 2
    • Views: 14,665
    09-24-2009, 05:52 AM Go to last post
  15. Kruskal-Wallis test in SPSS

    I have used The Kruskal-Wallis test to compare the performance on three groups of students. SPSS tells me that the null hypothesis can be rejected...

    Started by angoslezq‎, 04-29-2010 01:59 PM
    • Replies: 3
    • Views: 14,637
    04-29-2010, 06:05 PM Go to last post
  16. Post-hoc MANCOVA Tests in SPSS

    Hi, SPSS won't allow me to run post-hoc tests on a MANOVA with covariates - how can I now interpret results following a significant Wilk's Lambda...

    Started by garou22‎, 08-16-2011 08:09 AM
    • Replies: 4
    • Views: 14,621
    08-17-2011, 01:26 PM Go to last post
  17. Fisher's Exact Test for determining correlation between variables

    Hello all, My P.I. has presented me with a 2x2 contingency table and asked me to perform Fisher's Exact Test to determine whether a correlation...

    Started by Omega Glory‎, 09-02-2012 01:07 AM
    • Replies: 14
    • Views: 14,609
    09-24-2012, 11:52 AM Go to last post
  18. Question linear by linear association test

    I am having trouble finding what Linear by linear association tests are measuring. What do they mean?? I have one p-value that may be significant...

    Started by mlebowln‎, 10-22-2007 12:24 PM
    • Replies: 0
    • Views: 14,588
    10-22-2007, 12:24 PM Go to last post
  19. Cool Mixed 2x2x2 ANOVA Advice

    Hey guys, Just started a job as a research tech and part of job is statistical analyses and need your advice. I have analyzed this ANOVA but...

    Started by mathgeek10‎, 07-30-2010 08:49 AM
    • Replies: 1
    • Views: 14,569
    04-15-2011, 08:14 AM Go to last post
  20. Adjusted R-Square help

    I’ve just picked up my thesis from a 3 year hiatus so things are (more than) a little rusty. I need some help with interpreting adjusted R squares. ...

    Started by PhDoverdue‎, 03-25-2011 03:44 AM
    adjusted r-square
    • Replies: 4
    • Views: 14,558
    03-26-2011, 09:35 AM Go to last post
  21. Difference between one way ANOVA and within subjects ANOVA with one factor?

    Hi there, Out of interest I set up tests to run both a between subjects one way ANOVA and a one factor, repeated measures ANOVA in SPSS. There...

    Started by jamie10‎, 07-26-2010 04:41 PM
    • Replies: 2
    • Views: 14,525
    07-26-2010, 05:37 PM Go to last post
  22. T-test and large but unequal sample sizes

    Hi, I'm working with a very large data set and would like to compare two independent populations. For the first population, I have approximately...

    Started by adelwich‎, 04-05-2011 10:25 AM
    • Replies: 2
    • Views: 14,499
    04-05-2011, 04:03 PM Go to last post
  23. Factor analysis on likert scale questionnaire Help Needed!!!

    Hi, I am currently at the process of finishing my thesis and one of the means of gathering data I have used was a questionnaire with a likert scale...

    Started by Nikolays‎, 12-16-2008 12:29 PM
    • Replies: 4
    • Views: 14,460
    12-17-2008, 10:38 PM Go to last post
  24. Presence/Absence data- test for differences between groups

    Hello everyone, I want to figure out the differences in frequencies (presence) of heartwood rot in trees in three different zones. Each zone has...

    Started by lken‎, 03-08-2012 01:36 PM
    • Replies: 6
    • Views: 14,458
    03-12-2012, 06:16 PM Go to last post
  25. Interpreting PERMANOVA interactions

    I have a dataset from environmental dynamics of bacterial communities over time. My design has 3 factors: condition, year, and site. Condition and...

    Started by jaguarhammock‎, 11-24-2011 12:01 AM
    • Replies: 3
    • Views: 14,439
    11-24-2011, 03:13 PM Go to last post
  26. Unhappy 15 Likert scale questions: How do I find the mean, median and mode?

    Please Help! I need to find the mean the median and the mode and also use a t test to interpret my results between females and males in mate...

    Started by cardo‎, 12-17-2012 04:38 PM
    • Replies: 11
    • Views: 14,412
    12-18-2012, 03:03 AM Go to last post
  27. revisiting unbiased/biased sample variance/standard deviation

    I am revisiting a question I have on the biased/unbiased nature of the sample standard deviation and variance. It was previously discussed in this...

    Started by babucher‎, 11-03-2008 11:04 AM
    • Replies: 3
    • Views: 14,400
    11-03-2008, 03:20 PM Go to last post
  28. Test of hypothesis at 2% level of significance

    I would like to help answer this question: a mathematic journal recently reported the mean IQ of all statistics professors is at least 120. to test...

    Started by lulu88‎, 08-05-2011 09:01 AM
    • Replies: 4
    • Views: 14,381
    08-05-2011, 01:17 PM Go to last post
  29. level of significance Calculator Problem

    I need help with this question, Im studying for a test and this was an example problem. ( I already have the answers, im just trying to figure out...

    Started by cooltee13‎, 11-12-2008 04:26 PM
    • Replies: 3
    • Views: 14,372
    11-13-2008, 06:36 PM Go to last post
  30. How to transform non-normal data to normal

    Hi! I want to compare the differences in the amount donated for charitable purposes between two demographic groups (I want to check for...

    Started by majkel‎, 09-09-2010 10:45 AM
    • Replies: 4
    • Views: 14,365
    09-09-2010, 02:11 PM Go to last post
  31. Measures of variability for very skewed data

    Hi All, I've had a quick search through the forum and couldn't find an answer for this question, but I hope this isnt a repost anyway. As part...

    Started by Matt_47‎, 01-06-2010 12:42 PM
    • Replies: 3
    • Views: 14,342
    01-06-2010, 04:18 PM Go to last post
  32. Tukey table/chart

    Can anyone help me with this? I'd like to carry out a Tukey test for comparing the mean of 27 samples (and the degree of freedom is 26)....

    Started by Jane‎, 12-10-2008 03:22 PM
    • Replies: 9
    • Views: 14,325
    07-11-2011, 06:00 PM Go to last post
  33. My first time with statistics - Chi Square help needed.

    Hi guys, first post and first time EVER playing with statistics:eek: . I am looking for ways to summarise two sets of data I have collected. They...

    Started by drzoidberg‎, 03-31-2008 03:33 PM
    • Replies: 1
    • Views: 14,313
    04-04-2008, 03:57 PM Go to last post
  34. how two nominal variables can correlate?

    Hallo there, I do not understand how two nominal variables c.q. categories (c.q. non-numerical) can positively/negatively correlate with each other?...

    Started by cris‎, 06-29-2007 07:51 AM
    • Replies: 6
    • Views: 14,302
    04-07-2009, 11:11 AM Go to last post
  35. How to prove the expectation and variance of a Continuous Uniform Distribution

    Any help with these three questions would be very much appreciated: Consider a continuous random variable X from the Uniform distribution for x = ...

    Started by mh03‎, 08-02-2012 06:37 AM
    • Replies: 6
    • Views: 14,270
    08-03-2012, 02:03 AM Go to last post
  36. CHi square X2 to rule out differences between groups on demographics

    Hi I was wondering if someone could please help me understand how Chi square helps me rule out differences between groups on the demographics of...

    Started by katmonk‎, 02-24-2006 08:45 AM
    • Replies: 9
    • Views: 14,174
    03-08-2014, 09:14 PM Go to last post
  37. Relation between confidence interval, confidence level, and sample size

    Hi I am penning down my theoretical understanding of confidence interval, confidence level, and sample size. Kindly let me know if this is correct...

    Started by bsaikrishna‎, 01-20-2011 11:50 PM
    • Replies: 1
    • Views: 14,121
    01-21-2011, 12:57 AM Go to last post
  38. Kruskal Wallis/Dunn's test issue

    Apologies, I cannot find an answer to this on these boards... Anyway, first post... I have been asked to look at some stats by a colleague, and...

    Started by pnwright‎, 12-01-2012 05:16 AM
    • Replies: 8
    • Views: 14,056
    12-02-2012, 05:11 AM Go to last post
  39. Statistical Analysis that I can do with current data

    Greetings folks! The issue: I have analysed the 61 patients' SNPs (Single Nucleotide Polymorphism). SNPs are just the variation in the nucleotide...

    Started by Jamus.co.nz‎, 02-14-2009 05:44 AM
    • Replies: 4
    • Views: 14,044
    02-26-2009, 03:09 AM Go to last post
  40. z table question

    Hello everyone, I was hoping someone could shed some light on a question I have. A normal distribution with a mean of 80 and a standard...

    Started by desmoface‎, 10-07-2008 09:26 AM
    • Replies: 5
    • Views: 14,029
    10-08-2008, 07:12 AM Go to last post
  41. Comparing distributions (Kolmogorov–Smirnov?)

    I have two sets of data, S and T, both made up of people with a set of various attributes. S is much larger than T, and I would like to (a) draw a...

    Started by cab938‎, 07-22-2013 11:24 AM
    • Replies: 0
    • Views: 14,029
    07-22-2013, 11:24 AM Go to last post
  42. How important are the assumptions of ANOVA??

    I am doing some research on the impact of retention harvesting on soil nutrients and have been told by someone at my work that I do not have to test...

    Started by jhowery‎, 01-13-2011 02:03 PM
    anova, assumptions
    • Replies: 2
    • Views: 13,998
    01-13-2011, 05:11 PM Go to last post
  43. Question Help please! Homogeneity of variance violated

    Hi all, I'm in need of help - I'm trying to run a one-way ANOVA with 4 groups and I've just realised that the homogeneity of variance is violated. ...

    Started by princesszelda‎, 01-25-2009 10:10 PM
    • Replies: 7
    • Views: 13,952
    01-26-2009, 06:38 AM Go to last post
  44. Standard Error of Percentages/Ratio of Means

    Apologies if I am posting in the wrong in the wrong part of the forum. I am a Cell Biology researcher with a specific analysis question. I have...

    Started by ugm2tgh‎, 12-27-2011 05:39 AM
    • Replies: 7
    • Views: 13,936
    12-27-2011, 02:33 PM Go to last post
  45. Back to back stem and leaf plot

    Hi, I am trying to compare 2 distributions and I like the idea of back to back stem and leaf plot. Anybody knows of a software that might do that?...

    Started by mousme‎, 12-22-2009 10:43 AM
    • Replies: 2
    • Views: 13,886
    12-22-2009, 11:36 PM Go to last post
  46. Chi˛

    HI I don't understand something: Ex.: I have a question with a linkart scale: Are you agree with the following sentence I'm smart ! Not...

    Started by viwel‎, 10-08-2008 11:31 AM
    • Replies: 4
    • Views: 13,883
    10-09-2008, 10:44 AM Go to last post
  47. negative t-test value reported with a minus?

    I know this is probably the easiest thing in the world to know, but I can't find the answer in any of my text books: when a t-test value is...

    Started by jonj1‎, 04-13-2010 10:28 AM
    • Replies: 1
    • Views: 13,883
    04-13-2010, 10:57 AM Go to last post
  48. Question t test minimum sample size

    hello i have a problem: i have to different expperiments yielding time values, the one done in triplicate the other in dublicate. now i wanted to do...

    Started by kuzao‎, 10-07-2008 08:09 PM
    • Replies: 7
    • Views: 13,859
    05-04-2011, 08:43 PM Go to last post
  49. Two-way ANOVA and Tukey's HSD test

    Hope someone can help me out... Is it acceptable to use Tukey's HSD test after estimating a two-way ANOVA randomized block design. All my stat...

    Started by chaos‎, 08-11-2009 08:02 AM
    • Replies: 1
    • Views: 13,852
    08-11-2009, 08:25 AM Go to last post
  50. Probability vs propensity

    Hello, I like to think of myself as reasonably intelligent but this is a topic that I still haven't gotten my head around as many explanations...

    Started by osknows‎, 07-30-2010 03:21 PM
    • Replies: 4
    • Views: 13,850
    08-03-2010, 12:17 PM Go to last post
  51. Exclamation ANOVA Homogeneous Subsets

    Hi There, Sorry if this is a really silly question... I've run a 1-way ANOVA on some of my data, with a TUKEY HSD and S-N-K Post-Hoc test (as...

    Started by brooksclaire‎, 12-11-2013 02:48 PM
    • Replies: 3
    • Views: 13,850
    12-12-2013, 08:05 AM Go to last post
  52. A fundamental question!

    First sorry for my first-grade English! If you are OK with it, please read on. Second, sorry that my question is so basic, but sometimes I see...

    Started by victorxstc‎, 10-30-2011 04:23 PM
    4 Pages
    1 2 3 ... 4
    • Replies: 45
    • Views: 13,839
    01-25-2012, 05:57 AM Go to last post
  53. Question anova, Tukey post test, t test

    HI all, and thanks in advance for any help you can give. I am analysing data coming out of genetic studies and have 5 groups to compare...

    Started by Nancy‎, 08-04-2009 11:28 AM
    • Replies: 2
    • Views: 13,797
    08-04-2009, 12:05 PM Go to last post
  54. Calculating Test Statistic With Minitab

    I am currently trying to solve a problem and am having great difficulty. It is a hypothesis test that asks if the population proportion is greater...

    Started by doleary22‎, 11-04-2011 05:02 PM
    • Replies: 2
    • Views: 13,788
    11-05-2011, 06:27 AM Go to last post
  55. Margin of Error & Confidence Interval

    Hi With increased confidence interval, confidence level increases - I understand this. However in Sampling, When we link confidence interval as...

    Started by madhan10‎, 11-02-2011 01:36 AM
    • Replies: 3
    • Views: 13,779
    11-02-2011, 04:46 AM Go to last post
  56. Question Spearman's correlation: a continuous with a binary variable

    Hi everyone. I'm pretty new to statistics so sorry for the dummy question :o I need some nonparametric statistics to correlate a binary variable...

    Started by Forinstance‎, 12-27-2013 06:34 AM
    nonparametric, spearman's rho
    • Replies: 9
    • Views: 13,759
    12-29-2013, 07:20 AM Go to last post
  57. Help with Pearson Correlation - PLEASE

    I am still struggling with submitting my Thesis and Supervisor issues. I would appreciate some advice please. I have a sample size of 1089...

    Started by ppivec‎, 12-08-2010 07:54 AM
    • Replies: 11
    • Views: 13,717
    12-12-2010, 01:59 AM Go to last post
  58. Help with quantitative/qualitative/discrete/continuous problem.

    Hey Guys, I'm taking Statistics and am very confused. Even worse is that my textbook just confuses me more. I've got a problem set I've been...

    Started by Surma‎, 09-22-2008 09:34 PM
    • Replies: 1
    • Views: 13,701
    09-23-2008, 02:35 AM Go to last post
  59. ANOVA with unequal sample sizes

    hello, I have a question about ANOVA. This is the output I received when testing the effect of 'opnop' on mmse1. opnop is divided in 4 groups,...

    Started by Leslie‎, 02-01-2008 09:30 AM
    • Replies: 1
    • Views: 13,674
    02-01-2008, 02:54 PM Go to last post
  60. please help I have thought through these questions but still am not certain

    1. two samples from the same population both have M=84 and s^2=20, however one sample has n=10 and the other has n=20 scores. Both samples are used...

    Started by siengpin‎, 11-12-2010 12:30 PM
    • Replies: 2
    • Views: 13,637
    11-12-2010, 04:06 PM Go to last post

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