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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: 196,581
    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: 66,632
    09-30-2005, 09:44 AM Go to last post
  1. Question Comparing spectral reflectance curves - mean and variability (How??) Please!

    Hi everyone, I'm completely stumped. Statistics isn't my natural way of thinking but I've been trying and trying to nut this one out with no...

    Started by Weez‎, 01-11-2012 01:23 AM
    • Replies: 10
    • Views: 5,899
    08-21-2014, 08:49 AM Go to last post
  2. type of regression model

    Which type of regression model is it y=a+bx+e

    Started by sara b‎, 01-16-2014 11:25 AM
    • Replies: 10
    • Views: 2,184
    10-18-2014, 03:40 PM Go to last post
  3. Are standardised effect sizes usually biased?

    Hi all. I've been thinking about standardized effect sizes such as Cohen's D. They're getting pretty popular in psychology, and quant research...

    Started by CowboyBear‎, 06-12-2014 06:42 PM
    • Replies: 10
    • Views: 1,852
    06-12-2014, 08:46 PM Go to last post
  4. Question whether Y(employees injured) variation is due to X1(job function) or X2(population)

    Here is the actual question- There are 1000 employees in a firm, and the firm has four departments namely D1, D2, D3 and D4 with 100, 200, 300, 400...

    Started by Zznn‎, 08-25-2014 11:27 AM
    statistics business, statistics query
    • Replies: 10
    • Views: 2,049
    08-25-2014, 09:39 PM Go to last post
  5. Using range instead of standard deviation?

    In what circumstances would it be better to use the range than the standard deviation?

    Started by dudeman74‎, 09-11-2014 12:34 PM
    • Replies: 10
    • Views: 3,432
    09-11-2014, 03:21 PM Go to last post
  6. very large exp(B) value - seems strange

    Hi, I ran a logistic regression in SPSS with two dichotomous categorical predictors and their interaction to predict my dichotomous outcome...

    Started by jamie157‎, 10-21-2014 11:20 AM
    • Replies: 10
    • Views: 4,565
    10-23-2014, 01:26 PM Go to last post
  7. sampling distributions

    i really need help in sampling distributions can you help ?

    Started by djbigsteph‎, 11-27-2005 10:47 PM
    • Replies: 9
    • Views: 3,769
    11-27-2005, 11:38 PM Go to last post
  8. skewness issue

    I'm trying to find the skewness for this distribution using SPSS: Bin..........Freq 0-10........78 10-20......2589 20-30......922...

    Started by cmb‎, 02-11-2006 11:47 PM
    • Replies: 9
    • Views: 3,559
    02-16-2006, 04:30 PM Go to last post
  9. Question Non-parametric analysis question - please help!

    Hi. Cool forum btw - just what I need! :) I have agonised over this for while. I have two lots of questionnaire data - for one study this is...

    Started by alias grace‎, 06-08-2006 07:07 AM
    • Replies: 9
    • Views: 3,403
    06-19-2006, 10:07 PM Go to last post
  10. Complete Novice needs help with Analysis

    Hi all, Hope you are well. I'm in a situation with regards to a survey I have completed for my final year at University. The survey aims to...

    Started by euan‎, 11-14-2006 07:15 AM
    • Replies: 9
    • Views: 4,006
    11-23-2006, 11:19 AM Go to last post
  11. Need help to understand these

    Hello all, I need some help in understanding these, that's how to solve them. 1. I am selling pumpkins, and I sell an average of 100 per day....

    Started by e17ut‎, 05-12-2008 08:58 AM
    • Replies: 9
    • Views: 3,739
    05-13-2008, 03:02 PM Go to last post
  12. Case vs Group of Controls

    Hi. I am a medical resident doing a required research project. Perhaps someone can help me by pointing me towards the correct statistical test. I...

    Started by STOUCHA‎, 05-16-2008 04:51 PM
    • Replies: 9
    • Views: 4,173
    05-28-2008, 08:43 PM Go to last post
  13. Stats help on pearson's and spearman's

    Can someone please tell from the information given below, which equation (Pearson's r or Spearman's) would be most accurate and why? Pearson' s r=...

    Started by Sarah20‎, 06-06-2008 09:22 AM
    • Replies: 9
    • Views: 4,980
    06-06-2008, 11:15 PM Go to last post
  14. Small sample. What to do?

    Guys, My sample size is small...really small. Thinking of running non parametric test. Just wondering whether I can proceed or not. Need ur...

    Started by syah‎, 09-15-2008 12:51 AM
    • Replies: 9
    • Views: 4,498
    09-17-2008, 11:05 PM Go to last post
  15. sample size calculation based on correlation analysis

    For one of my studies, I have a continuous variable x 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: 13,338
    09-22-2008, 10:37 PM Go to last post
  16. I cant figure out the number of classes

    from these numbers I have to make a six column f/d table 30 26 16 23 22 10 8 15 16 23 29 30 22 15 24 9 5 4 15 24 21 24 16 14 21 13 6 2 23 29 24...

    Started by jj71787‎, 10-09-2008 07:22 PM
    • Replies: 9
    • Views: 9,946
    10-12-2008, 02:19 PM Go to last post
  17. Unhappy Help Please,before Saturday 10/25/08-Sample Size calculation

    hi guy i have couple of test review questions that i could not solve, if you can help me, i appricate it. 1.A researcher wishes to estimate the...

    Started by Nesha‎, 10-21-2008 01:05 AM
    • Replies: 9
    • Views: 4,032
    10-24-2008, 02:38 AM Go to last post
  18. corrections for when you thought of it in Neyman-Pearson

    Heres are rather general question about significance testing that I am not really able to get a grip on. In the Neyman-Pearson framework of...

    Started by spinningfeather‎, 10-22-2008 12:38 PM
    • Replies: 9
    • Views: 3,927
    10-23-2008, 04:30 AM Go to last post
  19. Thumbs up Ti 84 and weighted descriptive stats

    Hi Im really gettin frustrated here and I know some amazing person will help. I have a class where i constantly get problems like this: ...

    Started by ksnapp‎, 11-15-2008 11:08 AM
    • Replies: 9
    • Views: 4,626
    11-18-2008, 08:03 AM Go to last post
  20. Is the game fair?

    Hi, I have recorded the results of a binomial game (1 = win, 0 = lose.) The sequence is presented below. I am asked to provide compelling...

    Started by ZPlayer‎, 12-03-2008 09:09 AM
    • Replies: 9
    • Views: 4,282
    12-04-2008, 05:03 PM Go to last post
  21. I'm so lost

    I'm trying to work out this problem with the following data given, I am not good at excel and they ask us to use Excel, can anyone help me with how...

    Started by kripa.sharma‎, 12-05-2008 04:11 PM
    • Replies: 9
    • Views: 4,749
    12-11-2008, 07:39 PM Go to last post
  22. Defining T- Value

    Hello : I have a quick question to ask from your all. The question is very fair and simple and contain no more info. Actually I am taking out the...

    Started by mraj‎, 12-09-2008 02:40 AM
    • Replies: 9
    • Views: 3,018
    12-09-2008, 03:13 PM Go to last post
  23. 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: 14,305
    07-11-2011, 06:00 PM Go to last post
  24. Mauchly's test of Sphericity not defined. Why?

    Hello, With regard to Mauchly's test of Sphericity in order to assess validity of F statistic calculated for a one way repeated measures anova: ...

    Started by ozaz‎, 01-02-2009 05:13 PM
    • Replies: 9
    • Views: 32,558
    08-17-2009, 04:19 AM Go to last post
  25. Question Statistics, Non-parametric Methods!!!

    Please suggest me what Method I should use for this question. :wave: I think its either Wilcoxon signed-rank test or Mann-Whitney-Wilcoxon...

    Started by Sig‎, 01-28-2009 04:30 PM
    • Replies: 9
    • Views: 3,179
    01-31-2009, 12:40 AM Go to last post
  26. Chisquared equivalent for 2x5 table?

    Hi, I have a quick question re: analysing a dataset. The resulting table is 5 rows (a,b,c,d,e) and 2 columns (yes/no). I would like to determine...

    Started by lee_alkureishi‎, 01-21-2009 10:45 PM
    • Replies: 9
    • Views: 9,269
    01-26-2009, 04:02 PM Go to last post
  27. Find P (Urgent help, please!)

    Can't figure it out, and I'll lose 25 points on the rest of the question if I don't do it right. Can't find a private teacher around my area, and...

    Started by nerd_girl‎, 01-30-2009 01:15 PM
    • Replies: 9
    • Views: 3,348
    01-31-2009, 11:37 PM Go to last post
  28. Converting scientific to regular notation

    Hi there, Would anyone know how to convert 8.55E-007 to regular notation? Is there an online converter that can do this? Thanks, N:)

    Started by nikoleye‎, 04-11-2009 06:05 PM
    • Replies: 9
    • Views: 5,302
    04-12-2009, 08:55 PM Go to last post
  29. Which test?

    Hello I'm sorry to bother everyone but this probably has such a simple solution, but I can't get my head round it! I have read every statistics...

    Started by kris‎, 06-23-2009 08:33 AM
    • Replies: 9
    • Views: 2,464
    06-29-2009, 12:42 PM Go to last post
  30. What formula/calculation do I need?

    Hi everyone - if I've posted in the wrong place please forgive me and ask the moderator to move the thread :) OK I am a trainee surgeon who is...

    Started by bonedoctor‎, 06-28-2009 12:54 AM
    • Replies: 9
    • Views: 3,392
    07-13-2009, 05:47 AM Go to last post
  31. Dealing with lots of zeros

    Hello all - I am a stats amateur so please go easy! I am looking at catch per unit effort data of different species of sharks across seasons...

    Started by eddbrooks‎, 07-02-2009 05:08 PM
    • Replies: 9
    • Views: 28,083
    07-06-2009, 03:49 PM Go to last post
  32. Logistic regression: poorly distributed observations. What are the problems?

    I want to apply logistic regression to investigate the relative significance of various categorical predictor variables on a particular dichotomous...

    Started by rja67‎, 08-31-2009 12:43 PM
    • Replies: 9
    • Views: 3,283
    09-02-2009, 02:18 AM Go to last post
  33. Regression Equation

    Hi I am wondering if someone could please help me with a problem that I have with a project. I need to find an equation for a regression. I am...

    Started by Pejoda‎, 10-02-2009 11:14 PM
    • Replies: 9
    • Views: 4,370
    10-05-2009, 08:45 PM Go to last post
  34. How to scale the Gamma distribution when its probability is more than 1?

    Let us assume we have a gamma distribution with parameters alpha (or theta) = 1.33, beta (or k) = 0.0124 Some values of this gamma...

    Started by franziss‎, 12-29-2009 11:15 AM
    • Replies: 9
    • Views: 8,108
    01-01-2010, 10:33 PM Go to last post
  35. Significance test when not sampling

    I would like getting references to articles/books regarding this problem. My observations are all the countries of the world - in other words no...

    Started by Phontastik‎, 01-13-2010 08:47 AM
    • Replies: 9
    • Views: 3,088
    01-21-2010, 03:31 AM Go to last post
  36. 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: 13,393
    02-08-2010, 04:24 PM Go to last post
  37. Statistics of device life using different batteries??

    Consider a device that requires a set of batteries in order to function. When any one of these batteries fails, then the device will not function. ...

    Started by cmli4‎, 05-08-2010 09:11 PM
    • Replies: 9
    • Views: 3,092
    05-09-2010, 02:41 PM Go to last post
  38. 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: 14,746
    06-15-2010, 04:32 PM Go to last post
  39. Time Series analysis question

    Hi all, I have "panel data" (kind of) by country for "publication share," ie the percentage of total global publications contributed by a specific...

    Started by maruchan‎, 07-07-2010 01:49 PM
    • Replies: 9
    • Views: 4,663
    07-13-2010, 10:46 AM Go to last post
  40. Standard use of dummy variables fails in logistic regression

    I'm using a logistic regression to, among other things, adjust for the probability of a piece of evidence being true depending on its source. I have...

    Started by philgoetz‎, 07-21-2010 10:28 AM
    • Replies: 9
    • Views: 5,895
    07-28-2010, 03:14 PM Go to last post
  41. Effect in Experiment help needed

    Hi guys, First of all thanks for creating such a thing as a Stats help forum. This is one topic people will be flummoxed by at times and taking...

    Started by slippy667‎, 08-13-2010 12:55 PM
    • Replies: 9
    • Views: 2,729
    08-15-2010, 09:14 AM Go to last post
  42. Confidence interval for median

    The question is: A traffic warden notes the time cars have been illegally parked after their metered time has expired. For 16 offending cars...

    Started by winds‎, 09-10-2010 07:00 PM
    • Replies: 9
    • Views: 28,491
    10-12-2010, 09:58 AM Go to last post
  43. me or kaddstat

    Who is wrong? here is the question about difference between two means and my readings and kaddstats are way different The manufacturers of Good-O...

    Started by SadieKhan‎, 10-06-2010 06:14 AM
    • Replies: 9
    • Views: 5,655
    10-07-2010, 10:31 PM Go to last post
  44. its really very urgent, please help me

    i need help please, i have to present this results today. i just discovered that one of the variables (age)that i found it to be significantly...

    Started by nurul‎, 10-05-2010 08:58 PM
    • Replies: 9
    • Views: 3,264
    10-07-2010, 12:33 AM Go to last post
  45. Variance Question

    The government must decide how much a homeowner has to pay for a flood insurance policy lasting one year. Suppose there is a 2.5% chance that a flood...

    Started by Xtreme11‎, 10-11-2010 11:20 PM
    • Replies: 9
    • Views: 3,125
    10-13-2010, 01:03 PM Go to last post
  46. Few Simple Yet Hard Questions

    I am wondering if someone can help me understand why the answer for this question is what it is. Thanks 1) Brokers on Wall Street have to decide...

    Started by Xtreme11‎, 10-13-2010 01:32 PM
    • Replies: 9
    • Views: 6,787
    10-14-2010, 04:11 PM Go to last post
  47. standard deviation

    Hi, I'm new to this, so sorry if this has already been explained. My question is this: is it possible to have a mean=2.5 and a sd of 1.4, if it is...

    Started by siclaa‎, 10-28-2010 10:29 AM
    • Replies: 9
    • Views: 3,824
    10-29-2010, 03:09 PM Go to last post
  48. Significance Testing

    I was just going through the significance testing and I came to know that we use Chi-Square, T-test, and F-test for the significance testing. I would...

    Started by bsaikrishna‎, 10-28-2010 10:49 PM
    • Replies: 9
    • Views: 6,014
    10-30-2010, 08:36 AM Go to last post
  49. Smile Factors Retaining in Principal Component Analysis

    Hi everyone, Im running PCA (Promax rotation) and encountering few problems. I would highly appreciate if anyone of you can shed some light on...

    Started by zara‎, 11-02-2010 09:52 AM
    • Replies: 9
    • Views: 4,385
    11-05-2010, 02:18 AM Go to last post
  50. Analysis of simple "yes/no" data

    Dear All, I will firstly confess statistical incompetence, or perhaps general numerical incompetence. Perhaps just incompetence? I am attempting...

    Started by Captain Sensible‎, 11-30-2010 09:59 PM
    • Replies: 9
    • Views: 6,894
    11-30-2010, 11:28 PM Go to last post
  51. A simple question about variance/standard deviation

    I have a simple question about variance and standard deviation. i know they try to represent the average deviance from the mean. But why use sum of...

    Started by Penguin 101‎, 01-04-2011 05:52 PM
    • Replies: 9
    • Views: 6,277
    01-05-2011, 05:27 PM Go to last post
  52. Smile Urgent: Conditional Variance

    Hi, can someone please help me deriving the conditional variance. I've been working on this for about 2 weeks, my lecturer doesn't help and can't...

    Started by sp189‎, 01-04-2011 10:12 PM
    • Replies: 9
    • Views: 5,402
    01-10-2011, 11:07 AM Go to last post
  53. running a test with only n and mean (no single data points)

    Hi, I was wondering if it is is possible to use inferential statistics on two samples whereby all you know is the sample size of respondents (n)...

    Started by jamie157‎, 01-26-2011 08:12 AM
    • Replies: 9
    • Views: 3,545
    01-27-2011, 01:50 PM Go to last post
  54. How to arrive at a combined ranking

    This is a simple question. How can one arrive at a combined ranking for 10 students ranked independently by 6 professors? To more clear, if...

    Started by Dr.Appalayya‎, 02-23-2011 05:24 AM
    • Replies: 9
    • Views: 5,533
    02-25-2011, 03:31 AM Go to last post
  55. probability distribution of the ALTERNATIVE

    hello there! another quick question which i know it must be really basic but still... i'm having a little bit of trouble wrapping my head around the...

    Started by will22‎, 03-30-2011 02:06 PM
    • Replies: 9
    • Views: 3,079
    03-30-2011, 07:25 PM Go to last post
  56. Red face Likert scale statistical analysis

    Hi, I am doing research using a questionnaire which uses likert scale ratings. There are 8 different hypotheses and the questionnaire is set up so...

    Started by jimmy41324‎, 04-05-2011 11:48 AM
    analysis, likert scale, statistics
    • Replies: 9
    • Views: 11,368
    04-07-2011, 10:04 AM Go to last post
  57. Paired T-test

    Hello, I want to perform a paired T-test. I try to do this in Excel 2007. The only "problem" is, is that I already have my std. deviation and...

    Started by zerostin‎, 05-12-2011 09:28 AM
    • Replies: 9
    • Views: 4,370
    05-14-2011, 05:27 AM Go to last post
  58. How to use a Distance Matrix as an Independent Variable?

    Hello, Let's say I have 100 locations. I know the distance between each location (i.e. distance matrix). How can I use the distance matrix (or...

    Started by nofunsally‎, 05-18-2011 01:47 PM
    distance, matrices, matrix, response
    • Replies: 9
    • Views: 2,811
    05-19-2011, 08:32 PM Go to last post
  59. How to rank (overall) correlation of variables within a correlation matrix

    Hello, I have six correlation matrices in an Excel spreadsheet. Each has the same variables but reports on a different group. I would like to...

    Started by nofunsally‎, 06-02-2011 07:05 PM
    • Replies: 9
    • Views: 3,819
    06-06-2011, 02:15 PM Go to last post
  60. RED CAR...... from a learner !

    I would be grateful if anyone could give me a hint on how to go about doing the following ....(I am a learner in Stats) People were asked what...

    Started by seifugm‎, 07-16-2011 03:10 AM
    • Replies: 9
    • Views: 2,985
    07-17-2011, 03:30 PM Go to last post

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