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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. 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: 68,457
    09-30-2005, 09:44 AM Go to last post
  2. 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: 200,178
    07-16-2014, 11:01 AM Go to last post
  1. Please Help Me- Point Estimates of Variance & Standard Deviance of Population.

    Can someone please help me with this problem? (1) You have taken two samples. The scores in the first sample are 1,5,9. The scores in the second...

    Started by *N*‎, 02-09-2008 07:52 PM
    • Replies: 0
    • Views: 2,356
    02-09-2008, 07:52 PM Go to last post
  2. How to convert a table of probabilities to j.p.d.f

    Among the sudent that attempted the exams of Calculus III (CIII) and Differential Equation (DE) is oberved that the joint probability of passing or...

    Started by -illuzion-b18c1‎, 04-19-2006 05:08 PM
    • Replies: 0
    • Views: 2,629
    04-19-2006, 05:08 PM Go to last post
  3. Working out RSS in matrix regression

    Hey everyone Okay, I'm having a few problems. I'm fine with single variable matrix regression, using the formula \displaystyle RSS = \mathbf{e'e}...

    Started by .ACS.‎, 05-30-2010 04:57 AM
    • Replies: 0
    • Views: 2,898
    05-30-2010, 04:57 AM Go to last post
  4. Amchem's Tax Credit case study - stuck in a rut

    Hello everyone, and first of all thank you for taking the time to read this. I am a student in a Management postgraduate program and during our...

    Started by .chester‎, 12-10-2012 03:51 PM
    amchem tax credit, spss
    • Replies: 1
    • Views: 3,586
    12-12-2012, 03:34 AM Go to last post
  5. Finding Correllation B/W Education & Income

    So I've got this research assignment, on finding correlations. And I've found some data tables on Statscan for free. My thesis is that those of...

    Started by ///‎, 01-04-2007 04:09 PM
    • Replies: 0
    • Views: 2,760
    01-04-2007, 04:09 PM Go to last post
  6. ANCOVA Help

    I am giving a pretest and then a posttest after using clickers. Should I use an ANCOVA? What would my covariate be? I am thinking it would be the...

    Started by 01018space‎, 10-06-2009 07:21 PM
    • Replies: 0
    • Views: 3,203
    10-06-2009, 07:21 PM Go to last post
  7. Assuming Equal Variances- what to do?

    Hello, On my data I have assessed whether it's parametric. The distribution is normal, however on the Levene Statistic test, it has a significance...

    Started by 03turnerS‎, 04-13-2013 05:54 PM
    • Replies: 1
    • Views: 2,559
    04-13-2013, 06:07 PM Go to last post
  8. Is this correct?- Kriskal Wallis Test

    I want to compare multiple groups pre-intervention and post-intervention, to see which intervention was the most effective. So I calculated the...

    Started by 03turnerS‎, 04-10-2013 08:19 PM
    • Replies: 1
    • Views: 1,367
    04-10-2013, 09:19 PM Go to last post
  9. t-test

    If you are given a matched groups design but the number of participants in the two groups are different, what do you do to calculate the standard...

    Started by 06855377‎, 12-07-2007 07:35 AM
    • Replies: 0
    • Views: 1,873
    12-07-2007, 07:35 AM Go to last post
  10. Determining Sample size

    Hello, I need help determining a sample size n for both a control and an experimental group. If I know the effect size, the alpha, and the...

    Started by 06akbary‎, 02-08-2008 03:46 PM
    • Replies: 0
    • Views: 4,100
    02-08-2008, 03:46 PM Go to last post
  11. T-Tests

    I'm supposed to do a research project for my stats class and I'm so confused as to what my professor wants. We have to answer this sentence of...

    Started by 0c5er‎, 11-07-2008 12:04 AM
    • Replies: 1
    • Views: 3,656
    11-07-2008, 03:11 AM Go to last post
  12. Question Comparing two dependent sets of data based on their mean, SD and sample size

    Hello First of all, my knowledge in statistics is very bad, I took a basic course in statistics many years ago but I don't remember much about it...

    Started by 0rph‎, 11-14-2014 11:05 AM
    • Replies: 1
    • Views: 2,008
    11-14-2014, 03:51 PM Go to last post
  13. Inputting data with lots of variables/ which test to use?

    Hi, Really hope someone can help. For my final year project i am looking at language development in twins v singletons and comparing their results...

    Started by 101lou‎, 02-27-2014 11:23 AM
    • Replies: 7
    • Views: 1,656
    02-27-2014, 12:15 PM Go to last post
  14. Measuring relationship (correlation?) between continuous and categorical variables

    Really struggling with this so really appreciate help. I want to measure the difference between language scores (scores between 1 and 300) and 6...

    Started by 101lou‎, 03-16-2014 10:06 AM
    • Replies: 4
    • Views: 2,643
    03-16-2014, 04:22 PM Go to last post
  15. Multiple Linear Regression - really need help

    Hi, I'm going out of my mind...really need help. I have one continuous dependent variable (test scores) and 6 categorical (with 2 categories -...

    Started by 101lou‎, 04-02-2014 03:30 PM
    • Replies: 8
    • Views: 2,418
    04-08-2014, 11:01 PM Go to last post
  16. Data distribution

    If I have a single column of data; the weights of 100 individuals measured. How would I test to see what sort of distribution the weights follow. And...

    Started by 101tai101‎, 08-07-2017 04:44 PM
    • Replies: 11
    • Views: 694
    08-09-2017, 03:37 AM Go to last post
  17. Help! Z is annoying!

    Hi, I need help with understanding z. People always talk about z tests- but what does z actually mean? Is it the null? I've been given examples...

    Started by 10rob11‎, 12-15-2009 09:32 AM
    • Replies: 1
    • Views: 2,322
    12-15-2009, 09:36 AM Go to last post
  18. Help with basic definitions

    What is the basic difference between Kaplan-Meier and Cox Regression? How do I say it in as few words as possible. I am really limited by word count....

    Started by 11jono11‎, 01-11-2011 07:57 AM
    • Replies: 4
    • Views: 3,320
    01-16-2011, 06:59 PM Go to last post
  19. How to type stats symbols in word

    Hey guys, simple question, not directly related to statistics but I am trying to copy this Chi squared equation into word from a pdf but it won't let...

    Started by 11jono11‎, 02-14-2011 02:57 PM
    • Replies: 4
    • Views: 11,523
    02-14-2011, 06:00 PM Go to last post
  20. Which statistical test? I've shown my attempt to work it out.

    2 Questionnaires (for hope and self-image) are given to participants before, during, and after an intervention. All participants take part in the...

    Started by 12321‎, 12-28-2016 06:48 PM
    • Replies: 3
    • Views: 3,160
    01-10-2017, 07:11 AM Go to last post
  21. Stats help

    Hi all, I have a question: If I have five groups, overall significant one-way Anova, and I want to examine all pairwise tests, considering both...

    Started by 12345‎, 10-26-2006 10:21 PM
    • Replies: 1
    • Views: 2,750
    10-26-2006, 11:55 PM Go to last post
  22. Help!!!

    I am stuck for 2 hrs! please help!! I have a 2 by 4 design: amount of eating (independent variable, out of 100) on stress (low vs high) and time...

    Started by 12345‎, 10-27-2006 12:35 AM
    • Replies: 0
    • Views: 2,110
    10-27-2006, 12:35 AM Go to last post
  23. Regression Help

    Hi everyone, Can someone help me with this problem? Is it potentially problematic to collect data in small groups of 3-6 people? What is the...

    Started by 12345‎, 12-10-2006 06:13 PM
    • Replies: 0
    • Views: 1,961
    12-10-2006, 06:13 PM Go to last post
  24. Please help!

    Hi, I have a question: in a hierarchical regression when subsequent variables (X3 and X4) that are added later on results in the original variable...

    Started by 12345‎, 12-13-2006 01:08 AM
    • Replies: 1
    • Views: 2,375
    12-13-2006, 03:09 AM Go to last post
  25. equality of two samples

    Hello, I have 10 values of two sample for each month for the 1987-1996 period. Is it possible to test if these two samples are equal? if so, which...

    Started by 12345678‎, 01-19-2006 08:02 PM
    • Replies: 3
    • Views: 2,822
    01-19-2006, 10:21 PM Go to last post
  26. non normal distribution and regression

    Hi, If the distribution of y variable is not normal. (skewness equal to 1.1 and kurtosis to 8.2) can i run a simple linear regression of the y on...

    Started by 12345678‎, 04-18-2007 10:14 AM
    • Replies: 1
    • Views: 8,752
    04-18-2007, 11:20 AM Go to last post
  27. selecting regression variables

    If there are a large number of variables and you want to select few of them to build a regression model without multicollinearity what are usually...

    Started by 12345678‎, 11-05-2007 03:46 PM
    • Replies: 0
    • Views: 2,150
    11-05-2007, 03:46 PM Go to last post
  28. nb of variables in a regression

    Hi, I have a small sample of 96 observations. I developed an empirical model with 4 independent variables to explain the independent variables and...

    Started by 12345678‎, 02-07-2008 05:54 AM
    • Replies: 0
    • Views: 2,146
    02-07-2008, 05:54 AM Go to last post
  29. Correlation

    I have 2 sets. I formed 5000 random groups of sizes ranging from 2 to 100 per group from the 1st set (sample size:4991)and then computed the average...

    Started by 12345678‎, 11-16-2008 04:24 AM
    • Replies: 0
    • Views: 2,873
    11-16-2008, 04:24 AM Go to last post
  30. Factor analysis

    If I run factor analysis, I can estimate the coefficients of the factors without knowing the factors. But I am puzzled about how to determine the...

    Started by 12345678‎, 02-25-2009 12:19 PM
    • Replies: 1
    • Views: 2,266
    02-25-2009, 06:15 PM Go to last post
  31. Selection Bias

    I am wondering if someone can recommend an easy to read textbook that talks about sample selection bias

    Started by 12345678‎, 03-14-2009 03:42 AM
    • Replies: 0
    • Views: 3,117
    03-14-2009, 03:42 AM Go to last post
  32. Sampling

    Assume I have a population A of 4000 people and Population B of 400. I want to select a sample from A and a sample of B can I choose randomly 100 of...

    Started by 12345678‎, 04-15-2009 10:10 AM
    • Replies: 1
    • Views: 2,982
    04-15-2009, 05:16 PM Go to last post
  33. robustness check

    I am running a regression of 5 independent variables: y=intercept + beta1*X1+ beta2*X2 + beta3*X3+ beta4*X4 +beta5*X5 Someone has questionnned...

    Started by 12345678‎, 07-18-2009 03:34 AM
    • Replies: 0
    • Views: 3,564
    07-18-2009, 03:34 AM Go to last post
  34. Statistics problem (probability) - please help

    You have two options to buy an item: Option A: mean = 25,000 standard deviation = 3,500 Option B: mean = 26,000 standard deviation = 4,500 ...

    Started by 123go‎, 04-17-2009 11:16 PM
    • Replies: 0
    • Views: 2,695
    04-17-2009, 11:16 PM Go to last post
  35. Regression analysis with non-integer event rates

    I am working as part of a team on a relatively large dataset which has been subject to imputation analysis. One of my colleagues has pointed out...

    Started by 123Michael456‎, 07-13-2015 06:37 AM
    event rate, regression analysis
    • Replies: 13
    • Views: 2,386
    07-13-2015, 03:12 PM Go to last post
  36. Statistical dummy asks for help

    Hi, I have no idea how to solve those questions. If there is anybody, who knows the answers, I'd really appreciate if you help me. 1....

    Started by 124816‎, 08-10-2012 02:13 PM
    • Replies: 0
    • Views: 2,513
    08-10-2012, 02:13 PM Go to last post
  37. Player Pool Analysis

    Hi, :wave: loving this forum already - hoping to become a regular user for both work and hobby (online poker!!)!! Anyway my current conundrum is...

    Started by 12ange‎, 03-19-2011 05:50 AM
    • Replies: 3
    • Views: 2,939
    03-22-2011, 02:13 AM Go to last post
  38. Null and alternative hypotheses

    I am stuck on this question - I was wondering if I have the answer correctly A revenue department is under orders to reduce the time small...

    Started by 12canning‎, 04-04-2010 04:40 PM
    • Replies: 3
    • Views: 5,501
    04-09-2010, 02:02 AM Go to last post
  39. 99% confidence interval

    I have worked on this problem for awhile trying it different ways - A random sample of 250 students at a university finds that these students take...

    Started by 12canning‎, 04-04-2010 04:50 PM
    • Replies: 1
    • Views: 9,068
    04-13-2010, 10:30 AM Go to last post
  40. Discrete or Continuous?

    on average, how many cigarettes do you smoke per day? is it discrete or continuous? the thing that trips me out is the "average". some are...

    Started by 13corpse‎, 10-02-2010 02:10 PM
    • Replies: 1
    • Views: 4,800
    10-02-2010, 02:37 PM Go to last post
  41. Help on distributions!!!

    How would you best describe the population level data? Recall: Average dose of methotrexate for the GENERAL POPULATION OF ALL Lupus patients is 9.1...

    Started by 13corpse‎, 10-02-2010 03:06 PM
    • Replies: 1
    • Views: 2,610
    10-07-2010, 03:44 PM Go to last post
  42. Stats theory question!!!

    hi, i really do not understand how to answer the following question, i've read my textbook and still cannot find any relevant information. What...

    Started by 1485‎, 02-06-2011 02:11 PM
    • Replies: 0
    • Views: 2,069
    02-06-2011, 02:11 PM Go to last post
  43. Type I error

    Hi, im having some problems with this question, If there were more than J=2 groups and a t-test was used to compare the largest and smallest...

    Started by 1485‎, 02-06-2011 02:24 PM
    • Replies: 0
    • Views: 1,647
    02-06-2011, 02:24 PM Go to last post
  44. Quick Stats Question

    What is the advantage of using multiple comparison techniques over multiple t-tests? thank you

    Started by 1485‎, 02-06-2011 02:27 PM
    • Replies: 0
    • Views: 2,306
    02-06-2011, 02:27 PM Go to last post
  45. statistics

    if you have J=8, what is the maximum number of possible pairwise comparisons you can make?

    Started by 1485‎, 02-06-2011 02:30 PM
    • Replies: 3
    • Views: 2,986
    02-06-2011, 03:14 PM Go to last post
  46. better clustering

    Hi, I have some 40 to 50 arrays of numerical values i want to divide into some set groups by their trend can u guys suggest me a better approach. ...

    Started by 168768‎, 05-07-2009 03:23 AM
    • Replies: 5
    • Views: 3,037
    05-14-2009, 01:39 AM Go to last post
  47. Reduce Review of documents?

    Hello, I would like some advice on reducing 100% paperwork review in particularly for Complaint files. I was considering using Binomial...

    Started by 1981professional‎, 12-06-2013 05:44 AM
    • Replies: 0
    • Views: 1,341
    12-06-2013, 05:44 AM Go to last post
  48. Is the Chi-Squared test a suitable way to analyse this data? PLEASE HELP!!

    I have 2 data sets, one is my control, one experimental, and I have 4 distinct phenotypes resulting, which I'll call A, B, C and D. Control: A -...

    Started by 1982lu‎, 08-14-2008 05:10 AM
    • Replies: 4
    • Views: 2,903
    08-14-2008, 08:51 AM Go to last post
  49. First time I have ever been stumped

    Hey there guys, I love stats and this is my third year of it in high school. I received these two questions from a friend of mine and no one can get...

    Started by 1988bmwe24635‎, 04-18-2009 07:59 PM
    • Replies: 2
    • Views: 4,945
    04-20-2009, 08:09 AM Go to last post
  50. Fisher Information

    Hello. I have been told that Y is distributed as a binomial random variable with probability of success p and there are n trials. I have to find a...

    Started by 19paddy19‎, 02-23-2014 09:01 AM
    • Replies: 0
    • Views: 3,022
    02-23-2014, 09:01 AM Go to last post
  51. Dose Response Curves

    Hello all, Just a quick question about running stats in graph pad 6 on two dose response curves. I have to find out if at each dose, there is...

    Started by 1chris25‎, 03-05-2014 12:23 PM
    • Replies: 0
    • Views: 1,816
    03-05-2014, 12:23 PM Go to last post
  52. Help The basic practive of statisitc 4th edition

    Hello, I am looking for answers for the sample problems so that I can have a better understanding of Confidence Intervals and Signigicance...

    Started by 1happyday‎, 09-11-2007 12:48 PM
    • Replies: 0
    • Views: 7,134
    09-11-2007, 12:48 PM Go to last post
  53. How to sample a population?

    If I were doing a study on a particular disease in a small city, how would I go about sampling the population? Would it be legal to stand outside a...

    Started by 1in10croak‎, 12-13-2010 03:53 PM
    • Replies: 4
    • Views: 3,180
    12-13-2010, 08:35 PM Go to last post
  54. A bit confused on confidence intervals

    Why does the t-value for the 98% confidence interval increase to 2.33 from 1.96? Basically what determines these values and what does it mean?

    Started by 1in10croak‎, 10-14-2012 10:06 PM
    • Replies: 3
    • Views: 1,850
    10-15-2012, 03:19 PM Go to last post
  55. Sample size for ordinal logistic regression (or at least ordinal)

    I am trying to determine the sample size I need for my dissertation and I have no clue where to begin. I have been unable to find a sample size...

    Started by 1kellm‎, 12-13-2013 02:25 PM
    logistic regression, ordinal, power, regression, sample size
    • Replies: 1
    • Views: 9,192
    02-01-2014, 06:00 PM Go to last post
  56. I Need Help

    All, I am struggling with Statistics in all areas. I'm great with numbers, however, I'm lost with this. Can someone help? Here are the following...

    Started by 1NAMILL‎, 11-01-2005 02:48 PM
    • Replies: 6
    • Views: 10,644
    11-03-2005, 12:41 PM Go to last post
  57. Help

    My question is: Find the critical value Chi squared R corresponding to a sample size of 3 and a confidence level of 95 percent. I know that...

    Started by 1NAMILL‎, 11-04-2005 04:08 PM
    • Replies: 3
    • Views: 9,707
    11-04-2005, 05:25 PM Go to last post
  58. Help Again

    If forgot, I had one more. I'm stuck on this equation too: A quadratic regression model is fit to a set of sample data consisting of 6 pairs of...

    Started by 1NAMILL‎, 11-19-2005 10:08 AM
    • Replies: 5
    • Views: 3,548
    11-19-2005, 10:56 PM Go to last post
  59. Help

    I'm having a little trouble with the following question: Four pairs of data yield r = 0.942 and the regression equation (predicated value of y...

    Started by 1NAMILL‎, 11-18-2005 09:42 PM
    • Replies: 6
    • Views: 8,340
    11-19-2005, 10:10 PM Go to last post
  60. Dependent Sample Help

    The question is asking the following: The two data sets are dependent. Find to the nearest tenth (one decimal place). A 64 53 57 63 51 B...

    Started by 1NAMILL‎, 11-24-2005 10:40 AM
    • Replies: 1
    • Views: 4,911
    11-24-2005, 10:43 AM Go to last post

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