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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: 197,032
    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: 66,893
    09-30-2005, 09:44 AM Go to last post
  1. Question A case for a MANOVA?

    Hello everyone, So I am looking at a study with 60 kids, in 3 age groups year 1,2,3 (20-20-20) and how well they did in tests in 2 subjects,...

    Started by grphish‎, 03-29-2012 08:37 PM
    • Replies: 0
    • Views: 1,594
    03-29-2012, 08:37 PM Go to last post
  2. Red face A causes B - B causes C - Does A cause C?

    Hi all! I have a simple problem with my two hypotheses: H1: Industry dynamic (A) positively influences competence (B). H2: Competence (B)...

    Started by GabrielBox‎, 07-16-2013 02:37 PM
    • Replies: 11
    • Views: 4,692
    07-19-2013, 06:28 PM Go to last post
  3. Cool a challenging Question !

    any helpful guidelines ? Question As you may have noticed, Dr.Mike says “right” in class, A LOT, and now Dr.Mike has made this into a CFC...

    Started by james12‎, 11-28-2012 10:54 AM
    • Replies: 2
    • Views: 1,206
    11-28-2012, 12:20 PM Go to last post
  4. A class boundary confusion

    When there is grouped data like; x frequency 0 - 1 3 2 - 3 7 4 - 5 ...

    Started by lihinii‎, 09-21-2011 01:06 PM
    • Replies: 3
    • Views: 2,289
    09-21-2011, 08:21 PM Go to last post
  5. Question A composite score ?

    Hello there, I read several articles about composite scores but I still have a question. For my research, I need to merge two scales into one in...

    Started by fleuros‎, 05-24-2012 03:14 AM
    • Replies: 0
    • Views: 1,219
    05-24-2012, 03:14 AM Go to last post
  6. Question A conceptual question on stat test

    I'm using a chi-square test of confidence level 95%. The possible test results are: (1) test statistic below the threshold T: measurements are...

    Started by kazec‎, 08-13-2007 01:42 AM
    • Replies: 0
    • Views: 1,978
    08-13-2007, 01:42 AM Go to last post
  7. A conceptual question that i cannot came up with an answer!

    Hi again im editing the question because as i read the honor code of take-homes of my university, i realized that this should not be even here so,...

    Started by pyro‎, 11-17-2013 05:23 PM
    • Replies: 1
    • Views: 1,429
    11-17-2013, 06:14 PM Go to last post
  8. A conundrum: within- and between-subjects

    I'm facing the following problem with my results. Imagine that the experimental task was to place a circle and a square along a one-dimensional...

    Started by composer‎, 06-18-2010 03:09 PM
    • Replies: 0
    • Views: 2,377
    06-18-2010, 03:09 PM Go to last post
  9. Question A correctional institute

    A correctional institute would like to report the mean amount of money spent per day on running facilities. how many days should be considered if a...

    Started by jackmymonkey‎, 04-01-2009 11:08 AM
    • Replies: 0
    • Views: 3,271
    04-01-2009, 11:08 AM Go to last post
  10. A couple linear algebra questions (including SAS proc iml)

    EDIT: \sigma should be capital sigma, the covariance matrix, but I can't remember how to write it. First question Looking at Z, it's fairly...

    Started by APOCooter‎, 02-06-2014 03:52 PM
    • Replies: 1
    • Views: 1,633
    02-06-2014, 04:04 PM Go to last post
  11. A couple of regression questions

    Hi all, I'm pretty new to statistics and am getting a bit confused with all the terminology that's being thrown out there. I've tried googling...

    Started by DSPorter‎, 02-11-2015 06:54 PM
    • Replies: 3
    • Views: 1,766
    02-12-2015, 07:53 AM Go to last post
  12. A different kind of Drunkard's Walk

    A Different Drunkard’s Walk In short: Imagine a drunk waking up in the middle of a thin rope bridge. He can only go in one of two directions....

    Started by ExpertAlmost‎, 07-13-2009 10:30 PM
    • Replies: 1
    • Views: 2,520
    07-15-2009, 04:54 AM Go to last post
  13. Question A difficult SPSS question

    I have a data set in which household is as a unit (wide format) One of the variable is about relationship between household members, below is the...

    Started by John Miz‎, 05-02-2016 08:47 AM
    • Replies: 0
    • Views: 1,265
    05-02-2016, 08:47 AM Go to last post
  14. a fairly easy regression problem with answer

    I'm having some trouble figuring out what to do here...it's a problem to be addressed in class TOMORROW so we weren't really guided on how to do it,...

    Started by Nima2313‎, 05-05-2010 08:11 PM
    • Replies: 2
    • Views: 3,348
    05-05-2010, 10:55 PM Go to last post
  15. A few questions

    Hi just wondering if anyone could just make sure I'm doing this right. Can you also help on the last question especially. Thanks 1) Z~N(0,1) and...

    Started by mariomaths‎, 03-16-2006 04:17 PM
    • Replies: 1
    • Views: 2,457
    08-01-2014, 09:01 AM Go to last post
  16. A few questions

    I have a few stats homework questions that I can't seem to figure out and was hoping someone could help me figure out. Here are the questions, though...

    Started by flavoredgreen‎, 10-12-2008 07:41 PM
    • Replies: 1
    • Views: 3,999
    10-16-2008, 12:23 PM Go to last post
  17. Question A few questions from a sample final that have my mind boggled.

    As many of you know, it's finals time at many schools around the nation. I am currently enrolled in a Stats class, and it has to be one of the most...

    Started by baubry‎, 12-11-2012 01:50 PM
    • Replies: 0
    • Views: 2,160
    12-11-2012, 01:50 PM Go to last post
  18. A few questions.

    Hi all, I'm doing a review for my econometrics course and a few things came up. I"ll of course include what I've come up with so far. 1. If the...

    Started by canadia‎, 09-17-2010 06:41 PM
    • Replies: 2
    • Views: 1,748
    09-18-2010, 12:11 PM Go to last post
  19. a few stats problems

    1.find the margin of error for the 94% confidence interval for the mean systolic blood pressumes for women with n=92, xbar=114.9, and 0=13.2 2.the...

    Started by kt707‎, 11-29-2009 04:10 PM
    • Replies: 6
    • Views: 3,264
    11-30-2009, 01:04 AM Go to last post
  20. a flooding problem

    I am a little stuck here with my stats analysis, wondering if anyone could shed some light? I am testing whether long levee banks (used to protect...

    Started by Celine‎, 07-24-2007 01:57 AM
    • Replies: 1
    • Views: 1,794
    07-26-2007, 11:20 AM Go to last post
  21. A function to make up a profile of respondents?

    Hi I want to know if there is a function in SPSS to do the following: After running some frequencies and cross-tabs I ended up with a group of...

    Started by Mohamed Afifi‎, 07-26-2012 08:03 AM
    • Replies: 0
    • Views: 1,737
    07-26-2012, 08:03 AM Go to last post
  22. 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: 13,911
    01-25-2012, 05:57 AM Go to last post
  23. Question a good example of ANCOVA in R

    Hi, I was wondering if someone can provide a nice and quite complete example of ANCOVA in R. thanks :)

    Started by stablum‎, 06-17-2013 09:07 AM
    ancova, rlanguage
    • Replies: 2
    • Views: 1,354
    06-17-2013, 09:23 AM Go to last post
  24. A group is normally distributed but the other isn't

    Hi everyone, Using Shapiro -Wilk test I found that the assumption of normality for the control group was satisfied but that of the experimental...

    Started by MrM‎, 01-24-2017 05:46 AM
    • Replies: 7
    • Views: 2,192
    01-25-2017, 07:47 PM Go to last post
  25. A hypothesis testing question

    There is a multiple choice question paper of 60 questions each with four answers and only one of which is correct. With zero knowledge about the...

    Started by lihinii‎, 09-18-2011 08:32 AM
    • Replies: 2
    • Views: 2,005
    09-19-2011, 07:16 PM Go to last post
  26. a lil' more help

    :shakehead :wave: okay i am stuck on this one. a recent study in a city stated that the average of retired men was 63.5 years. A sample of 20...

    Started by hilarysears77‎, 12-08-2005 11:42 AM
    • Replies: 1
    • Views: 2,027
    12-08-2005, 11:53 AM Go to last post
  27. A little bit of combinatorics

    I didn't find a subforum devoted to combinatorics in this forum, so I post my question here. I have two sets. In one set I have N elements a1, ......

    Started by Usaty‎, 01-28-2013 06:04 AM
    • Replies: 4
    • Views: 1,541
    01-28-2013, 01:01 PM Go to last post
  28. A little Help

    So I'm doing this stats project. My project was to test how far(inches) a toy car can go off a ramp of five different heights (5, 10, 15, 20, 25...

    Started by Kiya Rose‎, 11-26-2013 12:06 PM
    correlation coefficient, statistics help, statistics project
    • Replies: 1
    • Views: 628
    11-27-2013, 09:27 AM Go to last post
  29. A little help on testing hypothesis

    Hi. I'm working on a few problems that ask me to test the null hypotheses or "what conclusions can I reach" using a 5% significance level. What...

    Started by hellayeah‎, 12-12-2010 02:49 PM
    • Replies: 2
    • Views: 4,626
    12-12-2010, 05:42 PM Go to last post
  30. A little help please...

    Hello everyone, I'm working on a lab for a test and have had trouble with these type of problems. Some I have already worked and just need a...

    Started by glass‎, 11-17-2010 07:21 PM
    • Replies: 3
    • Views: 4,613
    11-19-2010, 10:12 PM Go to last post
  31. A little help please...

    I have a problem regarding the statistical analysis of data from my research. I have calculated the sensitivity, specificity, PPV, NPV for various...

    Started by gp888‎, 01-22-2012 12:19 PM
    • Replies: 1
    • Views: 1,428
    01-28-2012, 07:56 PM Go to last post
  32. A little help with a HW problem

    I'm having trouble figuring out a HW problem and was wondering if someone could guide me in the right direction. Problem: Find The Z-Score That...

    Started by stripes28‎, 11-05-2010 04:48 PM
    • Replies: 4
    • Views: 2,171
    11-05-2010, 05:13 PM Go to last post
  33. A little help with some conceptual understanding

    Hi All, I am trying to help my wife with her University statistics project (Year 2) but her lecturer is incredibly unhelpful. The way they have...

    Started by TwistedHelix‎, 03-09-2014 12:31 PM
    • Replies: 2
    • Views: 1,591
    03-09-2014, 12:55 PM Go to last post
  34. A little help with statistics

    Hey all I am having trouble with statistics, and I am wondering if any of you can help me out with these few questions with steps. 1. A...

    Started by thug‎, 03-29-2010 03:25 AM
    • Replies: 0
    • Views: 1,485
    03-29-2010, 03:25 AM Go to last post
  35. a little question about mode and median

    I came across a situation where the median is equal to the mode, while the average is bigger. also, Q3-Q2 = Q2-Q1 can anyone tell me what can it...

    Started by dodovra‎, 03-08-2011 02:47 PM
    • Replies: 6
    • Views: 3,929
    03-10-2011, 11:24 PM Go to last post
  36. Question A manual example of Moran's Local I (Outlier)

    Dear forum, a question about spatial statistics: I am trying to uderstand exactly how the Local Moran's I equation works, the equation can be...

    Started by garynobles‎, 10-23-2013 07:54 AM
    • Replies: 0
    • Views: 2,813
    10-23-2013, 07:54 AM Go to last post
  37. A Marginal Distribution Problem

    Please help with an exam problem, Thanks! let x and y be jointly distributed discrete random variables, with P(X=x)=1/4, for x=1,2,3,4 ...

    Started by carfield‎, 11-14-2011 08:41 AM
    • Replies: 4
    • Views: 2,826
    11-14-2011, 10:23 PM Go to last post
  38. A measure for agreement between raters scoring

    Hi - I'm looking for a measure for the level of agreement between a number of raters who score performance of something on 1-4 scoring range. ...

    Started by jgray‎, 09-15-2015 03:37 PM
    concordance, consensus, inter-rater reliability
    • Replies: 4
    • Views: 1,664
    09-23-2015, 11:11 AM Go to last post
  39. Question A Medical Imaging statistics Question

    Hi, I did a training project a work a while ago and I never found a satisfactory answer to a inferential statistics problem. This question might...

    Started by csa84‎, 09-02-2010 10:32 AM
    • Replies: 1
    • Views: 2,855
    09-02-2010, 11:03 AM Go to last post
  40. A method sensitivity 1:10^3 or 1:10^5

    I am developing a PCR method to assess A cell contamination in B cells population. A cell express a large amount of C gene, but B cell only express...

    Started by Stem‎, 02-27-2017 11:44 AM
    • Replies: 0
    • Views: 1,499
    02-27-2017, 11:44 AM Go to last post
  41. A mixed hierarchical linear model (SPSS?)

    Hi there, I have the following design: Sub-regions (x 4) Within each sub-region are sites (x 20 in total: 4 in subr #1, 6 in subr #2, 7 in subr...

    Started by ausecol1‎, 03-23-2010 08:32 PM
    • Replies: 0
    • Views: 5,719
    03-23-2010, 08:32 PM Go to last post
  42. A name of this measure?

    How to name chg1/chg2 or is there any related (better/recognized) measure? before after chg1 chg2 chg1/chg2 ...

    Started by watashi‎, 06-29-2008 09:19 AM
    • Replies: 0
    • Views: 2,391
    06-29-2008, 09:19 AM Go to last post
  43. a need a little help here

    I'm not sure how to do this A sample of the reading scores of 29 fifth gtaders has a mean of xbar=83 and a population standard deviation of r=10.5....

    Started by oc9979‎, 03-16-2010 11:04 AM
    • Replies: 2
    • Views: 2,583
    03-16-2010, 11:20 AM Go to last post
  44. A non-parametric test for nomimal data made up from two independent variables

    I have been looking for a statistical test to run for some experimental data I have acquired. I have two groups (IV); Stress and Control mice. ...

    Started by LaySchmite‎, 02-23-2016 06:12 AM
    non-parametric test, repeated measures design, shapiro-wilk test
    • Replies: 0
    • Views: 1,125
    02-23-2016, 06:12 AM Go to last post
  45. a nonparametric test to study dispersion between two dependent samples

    Hi I have been using a nonparametric test (ansari bradley test) to study disperson between two samples, but i just realised that my samples were in...

    Started by tchetche‎, 11-27-2008 03:09 PM
    • Replies: 2
    • Views: 2,699
    12-04-2008, 12:51 PM Go to last post
  46. A parameter or a stastic

    1) A little confused? In a data set would the proportion of males constitute a a parameter or a statistic. My thought is that this is a sample...

    Started by badwithnumbers‎, 01-25-2009 11:57 AM
    • Replies: 1
    • Views: 3,026
    01-25-2009, 05:30 PM Go to last post
  47. A parametric hypothesis testing problem!

    Hello guys, So I have this problem I am trying to solve and it

    Started by glorean‎, 05-10-2015 03:55 PM
    • Replies: 1
    • Views: 1,166
    05-11-2015, 08:20 AM Go to last post
  48. A particular type of random coefficient regression

    Hi all, I have the model of type Y_i=Beta_0_i+Beta_1_i*X1_i+...+Beta_k_i*X_k_i, for i=1:n There is no error term in this model, but for each...

    Started by shoomchool‎, 11-04-2012 11:40 PM
    covariance matrix, heteroscedasticity, ols, random coefficient, regression
    • Replies: 0
    • Views: 1,049
    11-04-2012, 11:40 PM Go to last post
  49. A power analysis question - am I making a big mistake?

    Apologies for repeat posting, but I think I may have originally posted this in the wrong sub-forum... Help! It's a very long time since I have had...

    Started by Graham‎, 01-02-2010 04:24 AM
    • Replies: 1
    • Views: 2,462
    01-02-2010, 01:03 PM Go to last post
    • Replies: 2
    • Views: 1,710
    05-19-2011, 12:58 AM Go to last post
  50. A Prior for Cobb Douglas

    I have this equation Q= β0*(L^b1)*(K^b2)*e^u The question is how can I take into account that I have constant returns to scale? All I know is an...

    Started by Axter‎, 09-16-2013 09:35 AM
    a priori, cobb douglas
    • Replies: 2
    • Views: 1,879
    09-16-2013, 11:29 AM Go to last post
  51. a priori power analysis to determine sample size

    Dear Seniors, The design of my research is a within-subject 4-way anova. Each of the four independent within-subject variables has two levels. I...

    Started by student2008‎, 02-23-2009 05:51 PM
    • Replies: 0
    • Views: 5,239
    02-23-2009, 05:51 PM Go to last post
  52. Moved: a probability problem

    Started by mithrandil‎, 12-25-2006 09:46 PM
    • Replies: -
    • Views: -
    09-19-2006, 08:17 PM Go to last post
  53. A problem in Archaeology

    Hello! I'm an archaeologist finishing my thesis on the classification of the burials in a cemetery near Lake Titicaca, Bolivia. I finished my...

    Started by emachicado‎, 11-01-2008 04:29 PM
    • Replies: 0
    • Views: 2,036
    11-01-2008, 04:29 PM Go to last post
  54. a problem of MLE

    suppose X1,X2,…,Xn have joint distribution. if X1∼N(0,1) and for j=0,1,…,n−1 conditional distribution Xj+1|X1=x1,…,Xj=xj∼N(ρxj,1), then find MLE...

    Started by hadiSanji‎, 03-05-2012 05:32 AM
    • Replies: 1
    • Views: 4,251
    03-05-2012, 08:50 AM Go to last post
  55. Exclamation A problem of several dummies in regression(Excel)

    Hello, everyone! :) In Excel I tried to make a regression equation with several dummies. The task is: Include the manufacturer in a multiple...

    Started by Lisa92‎, 05-12-2013 06:29 AM
    • Replies: 0
    • Views: 5,051
    05-12-2013, 06:29 AM Go to last post
  56. a problem on chi-square test for weight data

    Dear all: Normally, we carry out chi-square test for NOMINAL data while T-TEST for numerical data. But I happened to meet the problem when...

    Started by kaikuoxu‎, 03-08-2009 04:31 AM
    • Replies: 0
    • Views: 2,439
    03-08-2009, 04:31 AM Go to last post
  57. A problem on conditional probability, with two random variables

    Hi , thanks for reading. The question I come across was as follow: Y1 and Y2 are independent poisson random variables with means A and B, a)...

    Started by PoorinStatistic‎, 04-20-2011 07:14 AM
    • Replies: 3
    • Views: 6,558
    04-20-2011, 05:19 PM Go to last post
  58. a problem regarding maximum and minimum of two positive random variables

    Suppose X and Y are two positive random numbers. Define U = max(X, Y ) and V = min(X, Y ) Show that: (a) E(X)E(Y ) >= E(U)E(V ): (b) Var(X) +...

    Started by tatai‎, 09-12-2012 11:21 AM
    • Replies: 1
    • Views: 1,242
    09-12-2012, 11:41 AM Go to last post
  59. A Proper Name for This Equation???

    This is my first post and probably not the last. My question is this: Is there a proper name for this equation? x values) - (Average of y...

    Started by the_gator‎, 06-14-2009 06:52 AM
    • Replies: 1
    • Views: 2,348
    06-14-2009, 06:55 AM Go to last post

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