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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: 196,665
    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: 66,688
    09-30-2005, 09:44 AM Go to last post
  1. 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: 13,582
    11-12-2010, 04:06 PM Go to last post
  2. Help with SPSS output interpretation: UNIANOVA

    Hi everyone, Iím having some troubles with the interpretation of my outputs, I really hope someone can help me out so I can continue interpreting the...

    Started by summer01‎, 09-04-2009 05:35 AM
    • Replies: 2
    • Views: 13,540
    09-08-2009, 07:29 AM Go to last post
  3. MANOVA and Levene's Test Significant Values

    Hi I've conducted a MANOVA with 11 dependent variables. All the other assumptions have been met, except the Levene's test. Levene's test of...

    Started by autumnleaf‎, 03-04-2010 06:21 AM
    • Replies: 1
    • Views: 13,505
    03-23-2010, 01:27 AM Go to last post
  4. Red face Comparing z-values and t-values

    Looking for some feedback as to whether I am on the right track for this problem: Suppose you have selected a random sample of n=7 measurements...

    Started by 3sacharm‎, 11-15-2010 12:37 PM
    • Replies: 1
    • Views: 13,488
    11-15-2010, 01:22 PM Go to last post
  5. Smile Multiple Choice Question

    Hello! Here is the problem: A group of eight people work on the 5th floor of the building.They all decide they want to lose weight by...

    Started by AlexKom‎, 12-10-2005 08:09 PM
    • Replies: 4
    • Views: 13,446
    12-10-2005, 09:25 PM Go to last post
  6. interpreting results of 5 point likert scale: statistical significance

    Hi, there are many questions on this forum related to likert scale (great forum by the way, I've learnt a lot!), but I could not find the question...

    Started by dancheeee‎, 01-12-2011 11:25 AM
    • Replies: 1
    • Views: 13,437
    01-12-2011, 11:41 AM Go to last post
  7. Standard deviation and variance examples needed

    I am trying to calculate SS, variance and standard deviation for the following sample of n = 5 scores: 10, 3, 8, 0, 4. Now the sum of squares...

    Started by Deganveran‎, 02-07-2010 05:06 PM
    • Replies: 9
    • Views: 13,411
    02-08-2010, 04:24 PM Go to last post
  8. P-Value

    What is the relationship between p-valuse and alfa. Are they not almost the same if not completely identical? If p-value is higher than alfa...

    Started by Dr.Appalayya‎, 10-12-2008 11:54 PM
    • Replies: 4
    • Views: 13,368
    10-13-2008, 06:15 AM Go to last post
  9. Equation/Formula for Critical Values Table

    Dear All, I have looked pretty extensively on the internet for a formula or equation for the Critical Values Tables. I have a large Excel...

    Started by chrishb59‎, 06-16-2011 10:39 AM
    • Replies: 7
    • Views: 13,362
    06-17-2011, 06:02 PM Go to last post
  10. sample size calculation based on correlation analysis

    For one of my studies, I have a continuous variable Ďxí for each subject. All the subjects will be given a questionnaire for a symptom assessment and...

    Started by placebo‎, 09-16-2008 10:55 PM
    • Replies: 9
    • Views: 13,344
    09-22-2008, 10:37 PM Go to last post
  11. Statistics/Probability Question

    I'm going over a study guide that I have for a test on Thursday and I'm having issues finding the answer to a "neither" question and I wanted to see...

    Started by aftyc1239‎, 02-13-2009 03:47 PM
    • Replies: 1
    • Views: 13,341
    02-14-2009, 11:42 PM Go to last post
  12. Econometrics/Regression/Statistics Help!

    Hi guys! I know this may be a little self-centered of me, asking for homework help as my first post, but I am extremely desperate! My tutor...

    Started by ivanyo‎, 09-08-2011 01:41 AM
    • Replies: 7
    • Views: 13,329
    01-20-2014, 07:47 AM Go to last post
  13. reading MAT files in R

    I am new to R so please excuse me if my question sounds naive. I downloaded the package R.matlab as I want to use the function readMAT (is there...

    Started by sak‎, 05-23-2011 09:19 PM
    • Replies: 1
    • Views: 13,304
    05-23-2011, 09:30 PM Go to last post
  14. How can I do a contrast in a repeated measures ANOVA using SPSS?

    I am trying to do a repeated measures (with three conditions), and I'm trying to compare the first condition to the last two. So in essence I really...

    Started by shateredsoul‎, 11-09-2009 11:35 PM
    • Replies: 2
    • Views: 13,300
    11-10-2009, 01:58 PM Go to last post
  15. Repeated Measures ANOVA - adding a covariate and interpreting the ouput in SPSS

    Hi there, I have recently conducted an experiment and have began analysing the data. I am investigating the effect equipment size has on...

    Started by tb13‎, 06-23-2012 06:37 AM
    • Replies: 2
    • Views: 13,297
    06-23-2012, 09:06 PM Go to last post
  16. Question How to interpret residual plot of a logistic regression?

    Hi all, I'm working on a default probability model and was modeling the default probability using logistic regression. The pearson residual and...

    Started by sufeipopo‎, 07-28-2014 02:47 PM
    • Replies: 5
    • Views: 13,292
    08-11-2014, 02:26 PM Go to last post
  17. Eigenvalues

    Hi Would you mind explaining the concept of the eiganvalue to me? Thank you Diane

    Started by Diane‎, 03-04-2006 02:41 PM
    • Replies: 1
    • Views: 13,281
    03-04-2006, 10:43 PM Go to last post
  18. Find the marginal distribution?

    deleted...

    Started by dementic‎, 03-27-2009 12:35 PM
    • Replies: 2
    • Views: 13,268
    03-27-2009, 05:49 PM Go to last post
  19. Finding z score of skewness and Kurtosis

    Dear all, I'm studying stat from Andy Field's "DISCOVERING STATISTICS USING SPSS" 3rd ed. In chapter 5 (Exploring assumptions) page 138 the...

    Started by smtareq‎, 01-05-2012 09:12 AM
    kurtosis, skewness, z-score
    • Replies: 1
    • Views: 13,267
    01-05-2012, 10:11 AM Go to last post
  20. does anybody know how to learning statistics online free?

    hi everybody, i was wondering if anybody here might know a good site to learn statistics online without paying. if anyone does know a good site a...

    Started by yankeebaseball60‎, 11-09-2005 05:05 PM
    • Replies: 4
    • Views: 13,252
    04-24-2013, 08:00 PM Go to last post
  21. z and t tests

    I've found myself struggling in Statistics since I just can't seem to grasp the explanations through symbols and equations, and am having...

    Started by silvermoondragon‎, 11-30-2009 01:09 PM
    • Replies: 0
    • Views: 13,239
    11-30-2009, 01:09 PM Go to last post
  22. Duncan's MRT test in SPSS

    Hi guys, Though a researcher, I must admit that Iím having real troubles with statistics. I have to make Duncanís new multiple range test, and after...

    Started by deljo12‎, 07-19-2010 07:53 AM
    • Replies: 4
    • Views: 13,202
    09-21-2010, 06:45 PM Go to last post
  23. Question ACF and PACF in excel

    Hi, I'm looking for some help regarding calculating the PACF of a time series in excel (I already have a working formula for the ACF) Any...

    Started by lulu‎, 07-24-2008 10:09 AM
    • Replies: 2
    • Views: 13,193
    11-02-2008, 04:25 AM Go to last post
  24. Equal sample sizes for Kruskal-Wallis required?

    Hi there I have a dataset where I'm applying Kruskal-Wallis test because it's not normal distributed and I have one ordinal dependant variable and...

    Started by smir‎, 12-27-2010 10:55 AM
    • Replies: 2
    • Views: 13,169
    12-28-2010, 02:46 AM Go to last post
  25. Transform data or non-parametric test of association?

    Hello :wave: This is my first post so hope it's in the right place. I am totally stuck, and am adding stats to the list of the things I can't...

    Started by Nostatsbrain‎, 05-10-2009 12:20 PM
    • Replies: 4
    • Views: 13,148
    05-12-2009, 04:45 AM Go to last post
  26. MLE for X ~ Exp(λ)

    Let (X1, ... Xn) be a random sample from a random variable. Find the maximum likelihood estimator for λ. I know the answer to this but do you...

    Started by StatsBeginner‎, 07-21-2014 11:06 AM
    maximum likelihood
    • Replies: 14
    • Views: 13,134
    07-22-2014, 07:13 AM Go to last post
  27. simple linear regression question

    just had a question last week on a test that asked to switch the dependent and explanatory variables (x and y) and determine the effect on the slope....

    Started by jk010786‎, 03-11-2008 03:24 PM
    • Replies: 1
    • Views: 13,124
    03-11-2008, 03:36 PM Go to last post
  28. Outliers in SPSS

    I`m doing multiple regression here. I use Casewise Diagnostics during regression analysis to check for outliers....where "case number xx" with...

    Started by GetItDone‎, 06-04-2010 07:44 AM
    • Replies: 0
    • Views: 13,123
    06-04-2010, 07:44 AM Go to last post
  29. Power and sample size for a paired t test

    Hi, I am trying to find out the way to calculate the power and number of samples required for a paired t test. And also to reverse engineer to work...

    Started by PeterVincent‎, 10-17-2009 03:55 PM
    • Replies: 1
    • Views: 13,099
    10-17-2009, 04:02 PM Go to last post
  30. Arrow 2 way anova vs.2 factor anova vs. block anova

    My head is swimming with terms. We learned a one way anova and then a block anova. The example was rows of different sporting good items and columns...

    Started by ealeql‎, 10-26-2010 10:27 PM
    • Replies: 3
    • Views: 13,092
    11-19-2010, 10:48 AM Go to last post
  31. Type II error calculation

    My question: It is desired to test H0: μ = 55 against H1: μ < 55 using α = 0.10. The population in question is uniformly distributed with a standard...

    Started by PBRN‎, 08-13-2011 09:38 PM
    • Replies: 7
    • Views: 13,091
    08-14-2011, 12:42 PM Go to last post
  32. Smile Acceptable significance level for Chi-Square statistic

    Hi All, I need to know if the significance level calculated for a particular Chi-square statistic is less than or equal to 0.05, can we reject the...

    Started by sachitha‎, 06-16-2010 12:54 AM
    • Replies: 4
    • Views: 13,083
    06-17-2010, 08:20 AM Go to last post
  33. Critical t value with .04 significance level

    The problem I am working on tests a claim with a significance level of .04 and it's a left-tailed test with degrees of freedom at 84. In my...

    Started by sweetsncheese‎, 08-12-2006 12:35 PM
    • Replies: 4
    • Views: 13,064
    08-13-2006, 11:48 PM Go to last post
  34. Decision table for statistical tests

    Hi there, does anybody know a good decision table for statistical test. The only one I have found and of which I think is ok to use is this one...

    Started by beginner‎, 12-02-2009 05:23 AM
    • Replies: 2
    • Views: 13,032
    12-02-2009, 09:11 AM Go to last post
  35. Post Calculating p-value

    Is there a way to calculate t-test p value from average,sem and number of samples compared.

    Started by arraf‎, 04-18-2007 03:08 PM
    • Replies: 5
    • Views: 13,031
    04-21-2007, 01:44 AM Go to last post
  36. Need help finding standardized test statistics!!!! PLEASE!!

    I have two homework problems that I can't seem to find the formulas on how to do this anywhere! Can anyone help me? I've tried to follow what I...

    Started by ashmckenzie‎, 06-30-2008 08:19 PM
    • Replies: 1
    • Views: 12,964
    06-30-2008, 09:11 PM Go to last post
  37. z-standardizing and centering...are they the same?

    It would seem that peforming these preparatory measures to transform the data are the same. However, I have received differing opinions. I have been...

    Started by danielkeeton‎, 11-30-2008 01:45 PM
    • Replies: 10
    • Views: 12,901
    12-03-2008, 06:40 PM Go to last post
  38. Reverse scoring on Likert-scale

    Please help us to proceed with our assignment, as we are stuck with this: We have made a questionnaire by using already tested scales that use...

    Started by Danka‎, 07-24-2012 05:43 AM
    • Replies: 2
    • Views: 12,887
    07-24-2012, 12:06 PM Go to last post
  39. Hypothesis testing with multinomial distributions

    If you throw a die and record the outcomes, you can test if the die is 'fair' with a chi-test. But how can you use the same data to determine with a...

    Started by Xeranox‎, 01-06-2010 06:10 AM
    • Replies: 12
    • Views: 12,884
    01-07-2010, 04:48 PM Go to last post
  40. Correlation - change over time

    Hiya, Apologies if this is a really basic question or if I'm just over-complicating things...I have a question related to correlations. I have 2...

    Started by statto‎, 02-15-2010 07:13 AM
    • Replies: 1
    • Views: 12,874
    02-15-2010, 12:36 PM Go to last post
  41. Question on decision rule

    I'm a little confused on how to make a decision rule given an alpha value. For example if the problem was a two ailed z test with a alpha of .03,...

    Started by ajk003‎, 03-02-2006 10:53 PM
    • Replies: 3
    • Views: 12,828
    03-03-2006, 02:17 PM Go to last post
  42. cohen's d

    If the sample size were n= 36, what value would be obtained for Cohnís d ? How does sample size influence the measure of effect size? Cohn`s d =...

    Started by SadieKhan‎, 10-16-2010 06:05 AM
    • Replies: 1
    • Views: 12,817
    10-16-2010, 09:17 AM Go to last post
  43. Post Lack of fit meaning

    Hello! I am a researcher fellow in the chemical engineering area and recently applied experimental design to my experiments. However I am having...

    Started by Nekas‎, 11-21-2011 11:51 AM
    lack-of-fit
    • Replies: 8
    • Views: 12,798
    11-23-2011, 04:47 AM Go to last post
  44. sample proportion

    if a random sample size of 100 is selected from population p=.40, what is the value of p bar, or the sample proportion?

    Started by lilbitt‎, 09-08-2007 01:43 PM
    • Replies: 1
    • Views: 12,788
    09-09-2007, 02:30 AM Go to last post
  45. How to 'reflect' negatively skewed data?

    Hello all, I have some not-normally distributed data so I want to log-transform it for my analysis. My data is negatively skewed and if I...

    Started by speedychicken‎, 10-04-2011 08:19 AM
    • Replies: 6
    • Views: 12,769
    10-05-2011, 08:10 AM Go to last post
  46. Likert Scale (1-5) statistical analysis

    Hi, I have done my search on this website and google and have found my statistical test to be either t-test or chi-square so I'd like you guys to...

    Started by farcus‎, 07-13-2012 09:22 PM
    4 Pages
    1 2 3 ... 4
    • Replies: 47
    • Views: 12,723
    07-23-2012, 07:29 PM Go to last post
  47. Filling in ANOVA table

    Below is a past exam question... Don't worry about i or ii because I can do them. r = 0.8 and 95% CI for rho is (0.71, 0.87), which is...

    Started by macro90‎, 11-22-2005 10:57 PM
    • Replies: 2
    • Views: 12,721
    11-22-2005, 11:17 PM Go to last post
  48. Minimum n for Chi square Test?

    Hey folks, I'm currently evaluating the data of a study we performed. Just got a very simple question: Is the a minimum number of subject...

    Started by vier.gewinnt‎, 06-03-2008 07:50 AM
    • Replies: 2
    • Views: 12,672
    06-03-2008, 09:12 AM Go to last post
  49. Question Logistic regression models with insignificant independent variables: valid?

    I'm using logistic regression to try to make predictions about the dependent variable. My model contains three independent variables (x, y,...

    Started by james‎, 12-15-2008 09:42 PM
    • Replies: 3
    • Views: 12,660
    12-15-2008, 11:30 PM Go to last post
  50. Non-parametric correlation help!

    I need to look for a correlation between a continuous variable (volume) and a dichotomous variable (metastasis). Can anybody suggest the correct test?

    Started by pboland‎, 05-20-2008 09:17 AM
    • Replies: 6
    • Views: 12,654
    07-07-2008, 07:35 AM Go to last post
  51. Beta distribution

    Hi, Could you please advise how to estimate the 95% confidence interval for the mean if the data which follows a beta distribution? Thank you...

    Started by schmidt1‎, 01-24-2009 08:29 AM
    • Replies: 7
    • Views: 12,626
    01-26-2009, 03:32 PM Go to last post
  52. Tukey's post-hoc for 2-way ANOVA?

    I ran a 2-way ANOVA, which showed an interaction effect. Let's say the independents are Color and Shape. And the dependent is Weight. Then I...

    Started by jawon‎, 10-03-2008 12:38 PM
    • Replies: 2
    • Views: 12,623
    10-06-2008, 01:07 PM Go to last post
  53. Chi-squared test for multiple samples?

    I have a problem that I can't seem to find an answer to in my statistics books or via Google, so I thought you guys might be able to help. I have...

    Started by Orngarth‎, 11-01-2010 07:19 PM
    • Replies: 6
    • Views: 12,622
    04-08-2013, 01:50 PM Go to last post
  54. Activity Budgets - testing for difference

    Hello All, Firstly, I apologise for posting yet again, but after some advice from the wonderful Ecologist he has advised me to be more precise in...

    Started by Dragonwalker‎, 12-12-2011 11:43 AM
    4 Pages
    1 2 3 ... 4
    • Replies: 45
    • Views: 12,614
    01-12-2012, 04:08 PM Go to last post
  55. Question Hi, can someone please just double-check my answers?

    Dealing with nominal-qualitative, ordinal-qualitative, and quantitative data: 1) License plates - nominal qual. 2) Names of the top 10 NFL players...

    Started by hdiana‎, 11-09-2009 12:13 PM
    • Replies: 1
    • Views: 12,599
    11-10-2009, 12:16 AM Go to last post
  56. First and second order model analysis

    Hello everybody, this is my first post so if I am doing something wrong please let me know! You see the model has 3 independent variables that...

    Started by repelsteeltje‎, 10-05-2009 05:57 AM
    • Replies: 1
    • Views: 12,592
    10-05-2009, 01:37 PM Go to last post
  57. Are there variations of the exponential distribution formula

    I have been trying to solve the question below for over an hour. I even found the answer to a similar problem on a Web site, but I can't understand...

    Started by ealeql‎, 04-16-2010 05:35 PM
    • Replies: 6
    • Views: 12,576
    04-17-2010, 02:11 PM Go to last post
  58. ROC significance

    Hi all! I'm using ROC analysis and would need to calculate whether a certain area under the ROC curve differs from 0.50 significantly. Here is...

    Started by Tikkuhirvio‎, 11-04-2010 07:15 AM
    • Replies: 2
    • Views: 12,556
    11-05-2010, 03:56 AM Go to last post
  59. Pearson's or Spearman's?

    I've plotted a scatterplot of rock pool length against limpet frequency, and I have to look for a correlation. The data is fairly widely scattered,...

    Started by Lightf00t‎, 11-30-2011 02:18 PM
    • Replies: 12
    • Views: 12,536
    02-01-2013, 02:23 PM Go to last post
  60. Extended Fisher's Exact Test

    Hi all, Over the last couple of months I have been on a very steep learning curve with statistics, having looked into Chi squared, log-linear...

    Started by UK2008‎, 02-17-2009 05:12 AM
    • Replies: 3
    • Views: 12,532
    02-17-2009, 03:31 PM Go to last post

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