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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: 196,759
    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: 66,758
    09-30-2005, 09:44 AM Go to last post
  1. 1 tailed vs. 2 tailed p-values

    I have been encountering some discussion lately on 1 vs. 2 tailed p-values. The 1 tailed test it seems is not preferred even with an a priori...

    Started by trinker‎, 08-12-2011 12:41 AM
    • Replies: 2
    • Views: 4,797
    08-12-2011, 01:04 AM Go to last post
  2. 1 X 2 Chi Square? With controlled expected values?

    Good Morning, Im wondering if you could possibly help me with a little problem. I have some data: 1. Number and date of disease outbreak...

    Started by SiobhanRoisin‎, 01-14-2016 05:43 AM
    chi square, expected values
    • Replies: 2
    • Views: 1,679
    01-14-2016, 09:34 AM Go to last post
  3. 1-PropZTest conditions?

    I am doing a test on skittles to see if the proportion of red skittles the company makes is truly 20%. To do this, I randomly took 10 bags of...

    Started by jc5211‎, 05-20-2010 06:07 PM
    • Replies: 1
    • Views: 3,624
    05-20-2010, 06:36 PM Go to last post
  4. 1-sample binomial for my research data?

    Hi, Newbie here so I will try to explain as clearly as I can. I do research in the neuro field. I have a control group of neurons that I am...

    Started by nufo‎, 10-10-2016 03:43 PM
    binomial, chi sq test, t-test
    • Replies: 1
    • Views: 1,297
    10-11-2016, 12:16 AM Go to last post
  5. Question 1-Tailed Levene Test

    I am interested in testing if the variance of one data set is bigger than another set. I thought about using a simple F-test, but I am not sure the...

    Started by stretchtiberius‎, 09-14-2011 12:17 AM
    1-tailed, anova, levene, t-test, variance
    • Replies: 5
    • Views: 5,104
    09-17-2011, 12:34 PM Go to last post
  6. 1-way analysis of variance - Anova - data question

    Hey, The data set I'm using is attached as an excel file. It is a benthic count for different water bodies at some location. I get that he...

    Started by CyberA‎, 12-02-2013 11:44 AM
    • Replies: 1
    • Views: 1,300
    12-02-2013, 04:26 PM Go to last post
  7. 1-way ANOVA help

    So i have some readings I'm need to do 1-way ANOVA, but i need to asses the normality - the prof said its ok to just use Q-Q plots to do this...

    Started by JustinZ‎, 03-10-2008 10:36 PM
    • Replies: 1
    • Views: 1,672
    03-11-2008, 04:00 PM Go to last post
  8. 10$ for solving 2 questions

    Dear Experts, I am a undergraduate student and till tomorrow I have to solve this (graded) exercise. For you this exercise might be very easy. ...

    Started by cfdreen‎, 01-31-2016 02:26 AM
    • Replies: 6
    • Views: 1,790
    01-31-2016, 03:05 PM Go to last post
  9. 101 Homework Linear Regression Analysis

    When I'm asked to determine a linear regression model equation to represent data, am I being asked to create a graph? or enter the Y=25.326x + 353.16...

    Started by TaylorM‎, 05-07-2014 08:36 PM
    • Replies: 0
    • Views: 2,038
    05-07-2014, 08:36 PM Go to last post
  10. 11 standard deviations

    Hello. I am new here...my first post. Anyway, last week in the stock market the financials rallied ~13%. I read that this is 11 standard...

    Started by kojak‎, 07-21-2008 01:42 PM
    • Replies: 0
    • Views: 5,333
    07-21-2008, 01:42 PM Go to last post
  11. Poll Poll: 11-point DV. Linear or Ordinal Regression?

    Hi y'all, I've got a survey of twenty (dichotomous) questions, and one 11-point scale question. The 11-point scale question is scored 0-10, and...

    Started by witheye‎, 01-14-2008 11:08 PM
    • Replies: 4
    • Views: 3,070
    01-18-2008, 03:09 AM Go to last post
  12. 12 years old. Expected value help please?

    Hi I'm just getting started with this topic and am stuck. X follows a continuous uniform distribution on . Find E. K is a integer. I got θ as...

    Started by Davie322‎, 10-09-2013 06:20 PM
    • Replies: 1
    • Views: 1,366
    10-09-2013, 08:42 PM Go to last post
  13. 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: 14,400
    12-18-2012, 03:03 AM Go to last post
  14. 1970 Draft Lottery

    And also I have a trouble with this: Based on the box plots, which statement is correct? a) There seems to be no relationship between birth month...

    Started by AlexKom‎, 11-25-2005 11:51 PM
    • Replies: 1
    • Views: 4,685
    11-26-2005, 12:12 AM Go to last post
  15. 2 (Easy) Regression Questions

    Hi guys. I just joined Talk Stats. So I recently just returned to school after being hit by Crohns' Disease for a year, and I was wondering if you...

    Started by rollnrocking‎, 05-24-2014 09:38 PM
    • Replies: 0
    • Views: 3,072
    05-24-2014, 09:38 PM Go to last post
  16. 2 ANOVA related questions

    Hello, I've been stuck on these two practice questions for the last few hours. My professor said that this section is important for our midterm...

    Started by athom‎, 03-19-2010 04:05 PM
    • Replies: 1
    • Views: 3,265
    03-22-2010, 01:59 PM Go to last post
  17. Question 2 Coops and Chickens problem

    Hi, I have a question as homework to solve, but although it's so easy (as everyone says) I am not still able to solve it. Could you please help me...

    Started by Warrior‎, 05-05-2014 09:30 PM
    homework, probability, statistics
    • Replies: 4
    • Views: 1,814
    05-05-2014, 10:20 PM Go to last post
  18. 2 Different Population sizes - ED Visits

    Hi, I have data from last year on Emergency Department Visits to an Urban Hospital. I would like to compare the impact of the type of primary...

    Started by PedroR‎, 03-25-2013 05:21 PM
    • Replies: 1
    • Views: 1,571
    03-26-2013, 06:44 PM Go to last post
  19. 2 eyes --> One problem

    Hi all! I am an optometrist doctorandum student in Madrid. I am comparing vision of people with a strange disease afecting eyes and normal people. ...

    Started by Raulone‎, 03-31-2011 10:31 AM
    • Replies: 7
    • Views: 3,742
    03-31-2011, 04:47 PM Go to last post
  20. 2 groups with ratio(s); How to test between-/within-group differences?

    Hi statistics community I am wondering if anyone could please give me advice on my rather simple (I assume) statistical problem. I am working...

    Started by ~Narayan~‎, 08-28-2012 04:51 AM
    between-group differences, ratio, within-group difference
    • Replies: 9
    • Views: 3,288
    08-31-2012, 02:38 PM Go to last post
  21. 2 Independant Groups analysis HELP

    Hi, I'm conducting a study looking at the effects of hypnosis on performance anxiety and golf putting scores. I have 2 groups (Hypnosis and Control)...

    Started by Turan‎, 03-16-2012 05:33 AM
    anxiety, hypnosis, independant groups
    • Replies: 2
    • Views: 1,680
    03-16-2012, 09:41 AM Go to last post
  22. Question 2 independent categorical variables. What test do I use?

    Sorry if this has been asked before, if it has I couldn't find it. Also excuse me if I mix up terms, I'm a bit of a novice. My experiment had two...

    Started by user127‎, 03-11-2014 11:01 AM
    categorical, ecology, interesting, multiple, variables
    • Replies: 5
    • Views: 2,059
    03-11-2014, 03:09 PM Go to last post
  23. 2 independent groups - compare results of questionnaire

    Hi Guys, I am working on a project at work which has nothing to do with statistics, but as a small part of it I need to compare results of...

    Started by mirka‎, 05-04-2014 03:20 PM
    • Replies: 1
    • Views: 1,011
    05-04-2014, 03:31 PM Go to last post
  24. 2 IV outcomes and 3 predictors?!

    I have a study investigating the impact congestion charging will have on travel behaviour. Outcomes: 1. Public Transport Use 2. Non-Public...

    Started by boodika‎, 11-03-2008 10:35 AM
    • Replies: 2
    • Views: 2,764
    11-03-2008, 05:33 PM Go to last post
  25. 2 IV's & Several DV's

    Hi I have 2 distinct groups, smokers and nonsmokers. I'm comparing their behavoural flexibilty, cognitve flexibility and habitual behaviour. ...

    Started by lormak‎, 08-07-2008 01:51 PM
    • Replies: 7
    • Views: 3,785
    08-08-2008, 11:44 AM Go to last post
  26. 2 or more DV in the regression

    Hello, I have 3 DV's and 10 IV's. I want to know for each dependent variable separately by which independent variable it is affected most? what...

    Started by ansunil‎, 04-04-2013 01:32 AM
    • Replies: 0
    • Views: 925
    04-04-2013, 01:32 AM Go to last post
  27. 2 populations of non-dichotomous proportion data?

    Hi there, I am wondering if anyone here could help me with this data. What I have is data from two independent populations (two different types of...

    Started by Wakatie‎, 05-11-2008 04:30 PM
    • Replies: 1
    • Views: 3,625
    05-13-2008, 03:46 AM Go to last post
  28. 2 problems

    The owner of a restaurant that serves continental food wants to study characteristics of customers of his restaurant. In particular, he decides to...

    Started by davidzhou176‎, 08-22-2008 05:38 PM
    • Replies: 2
    • Views: 4,953
    08-23-2008, 09:57 AM Go to last post
  29. Question 2 Problems - HELP!!!

    :confused: new to this whole stats thing , and ive been going over these 2 questions for ages and cant come to a conclusion , someone plz help ,...

    Started by Echoesofreason‎, 06-02-2006 03:13 AM
    • Replies: 0
    • Views: 2,363
    06-02-2006, 03:13 AM Go to last post
  30. 2 problems I can't figure out 1% and 5% significance level

    two problems that my classmate and I can't figure out...maybe you can help! A health club manager claims that members lose an average of 15 pounds...

    Started by mudnuri‎, 12-16-2007 06:18 PM
    • Replies: 4
    • Views: 4,454
    12-18-2007, 06:08 PM Go to last post
  31. 2 Questions on quality improvement

    Q1. My p-chart from data below saw that the process is out of control. What should a team do now regarding this data?

    Started by student865‎, 12-08-2011 03:43 PM
    • Replies: 10
    • Views: 1,930
    12-08-2011, 05:02 PM Go to last post
  32. 2 questions: dice problem and hypergeometric problem

    The problem is: Suppose the Braves and the Indians meet again the World Series. Assume that the probability that the Braves win a game is 0.55;...

    Started by statrat‎, 10-24-2013 12:25 PM
    • Replies: 2
    • Views: 1,424
    10-24-2013, 02:39 PM Go to last post
  33. 2 Sample Distribute

    ROA is an indicator how profitable a company Is relative to its assets. Note: I know I haven't given the dataset.

    Started by vernonicamexie‎, 09-22-2017 06:06 PM
    statistic test, stats help, two sample distribute
    • Replies: 1
    • Views: 197
    09-22-2017, 06:17 PM Go to last post
  34. 2 sample independent sample t test

    Can someone please explain why you don't square the variance in this problem and do for others??

    Started by Jbueno‎, 02-28-2016 10:01 PM
    • Replies: 2
    • Views: 1,912
    02-29-2016, 02:38 AM Go to last post
  35. 2 sample proportion test

    Carrefour wanted to find the percentage of sales at two such stores in city A and city B for which at least one of the item was returned. A sample of...

    Started by dojob‎, 12-31-2013 09:43 PM
    • Replies: 0
    • Views: 1,314
    12-31-2013, 09:43 PM Go to last post
  36. 2 Sample T Test for Nonnormal data

    Hi everyone! I work in the advertising industry and I am in the process of creating a t test calculator. The calculator will be used to test the...

    Started by goducks13‎, 04-05-2013 02:32 PM
    • Replies: 0
    • Views: 1,286
    04-05-2013, 02:32 PM Go to last post
  37. 2 samples t-test: normal or not?

    Hi. For a 2 sample t-test, where I'm checking the assumptions, I'm getting contradictory (at least to me) results regarding normality, between...

    Started by deltango‎, 01-24-2014 08:57 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 4,147
    07-16-2014, 09:47 PM Go to last post
  38. 2 separate models to look at variates plus interactions or only one model needed?

    Hello, any guidance would be much appreciated! I'm running a multivariable analysis using Proc GLM. My dependent variable is continuous, while all...

    Started by Jainie‎, 08-14-2012 07:43 AM
    • Replies: 2
    • Views: 1,986
    08-14-2012, 08:43 AM Go to last post
  39. 2 short questions

    1) is quadratic or cubic relationship a non linear relationship? 2) Do I always have to calculate the sample size for analysis? e.g. if required...

    Started by convivial‎, 09-03-2009 07:56 AM
    • Replies: 4
    • Views: 2,055
    09-04-2009, 02:56 AM Go to last post
  40. 2 sided exact significance in fisher's exact test

    i compared the frequency of cardioembolism between age-group <45years and 46-50 years using SPSS using cross-tab. As you can see the result in the...

    Started by hikehub‎, 09-29-2012 12:57 AM
    • Replies: 1
    • Views: 21,650
    09-29-2012, 06:09 AM Go to last post
  41. 2 standard deviations above and below the mean?

    Hello, and HELP!! My professor has given us a range of numbers in excel, and is asking for "one standard deviation above and below the mean, and 2...

    Started by njcooney‎, 04-06-2012 09:05 AM
    • Replies: 2
    • Views: 6,670
    04-16-2012, 08:41 AM Go to last post
  42. 2 stat problems

    1) The average size of insurance claims processed by Good-Wish Insurance Company for the month of August is $710. If you assume that the population...

    Started by RSLogo717‎, 04-19-2008 01:02 PM
    • Replies: 1
    • Views: 1,985
    04-19-2008, 01:27 PM Go to last post
  43. 2 step questions and how to model them

    A common set of items in large government funded databases like PISA and TIMSS are two stage questions. For example I have a set of items from the...

    Started by Lazar‎, 08-06-2013 07:04 PM
    • Replies: 3
    • Views: 1,413
    08-07-2013, 02:45 AM Go to last post
  44. 2 Tail Hypothesis

    A shopper felt that there was no difference between the price of Ever ready batteries and DuraCell batteries. To test her claim she checked the...

    Started by fantasydawn‎, 11-26-2006 09:49 PM
    • Replies: 0
    • Views: 2,501
    11-26-2006, 09:49 PM Go to last post
  45. 2 way and 3 way interaction

    Can anyone explain why a two way interaction only becomes significant when a third factor is introduced. For eg. Time*Treatment ns p=0.2...

    Started by Palermo‎, 02-12-2017 08:50 PM
    • Replies: 0
    • Views: 1,607
    02-12-2017, 08:50 PM Go to last post
  46. 2 Way ANova

    I need to run a two way ANOVA there is 3 rows and 5 columns in each cell there are two sets of scores. Do I add these scores to run my test? Then...

    Started by Mlopezrn‎, 02-19-2011 03:40 PM
    • Replies: 3
    • Views: 2,944
    02-19-2011, 07:36 PM Go to last post
  47. 2 way anova

    Dear SPSS thinkers, I have a case with one dependent variable ( image of a product) and two independent variables, gender and age. My problem lies...

    Started by SPSSpraepi‎, 06-06-2013 05:01 AM
    2 way anova
    • Replies: 0
    • Views: 1,334
    06-06-2013, 05:01 AM Go to last post
  48. 2 Way ANOVA

    I'm trying to get an understanding of 2 way ANOVA and how I interpret the results. I found a sample problem and managed to figure out how to enter...

    Started by edconway14‎, 01-18-2014 06:32 PM
    • Replies: 1
    • Views: 2,550
    01-20-2014, 08:09 AM Go to last post
  49. 2 way ANOVA and mediation

    Hi i'm doing a 2( game type: violent and non-violent) x 2(parenting type: strict and consultative) two way ANOVA to assess their effect on...

    Started by dorna6530‎, 10-28-2013 08:03 AM
    • Replies: 0
    • Views: 3,562
    10-28-2013, 08:03 AM Go to last post
  50. Question 2 Way ANOVA or lots of T-tests!!! Just cant get my head round it!!!!

    Hi everyone, I really cant get my head round which test i am supposed to use and every time i think i have it sorted in my head, i change my mind,...

    Started by mbxhjl‎, 05-30-2007 03:02 AM
    • Replies: 1
    • Views: 2,484
    05-31-2007, 11:41 AM Go to last post
  51. Question 2 way ANOVA post hoc tests SPSS

    :wave:I have been using 2 way ANOVAs SPSS in base 15.0 to look at the effect of two fixed factors (treatment and brain region) on a dependent...

    Started by TRA‎, 11-18-2008 12:54 AM
    • Replies: 4
    • Views: 10,516
    05-14-2013, 02:53 PM Go to last post
  52. 2 way ANOVA posthoc VS pairwise comparisons

    I am doing some research that I am analysing with a 2 way ANOVA, using SPSS version 17 software. The design of my analysis is: 2 between subject...

    Started by psych_phd‎, 02-09-2010 09:35 AM
    • Replies: 6
    • Views: 21,176
    04-19-2011, 09:05 PM Go to last post
  53. 2 Way ANOVA questions

    1. Why does the main factor MSS in 2 way ANOVA sometimes carry long interaction effect? 2. Why does (Yi - Yj - Yij +Ygrand) appear in the...

    Started by kau888‎, 12-14-2008 03:41 PM
    • Replies: 0
    • Views: 3,368
    12-14-2008, 03:41 PM Go to last post
  54. 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: 13,122
    11-19-2010, 10:48 AM Go to last post
  55. 2 way anova with interaction

    Hi Everyone, I have a huge dilemma about reporting my ANOVA, Both the factors and the interactions have significant p values. I went ahead and...

    Started by KOPPAKA‎, 10-20-2013 10:41 AM
    • Replies: 1
    • Views: 1,216
    10-20-2013, 11:17 AM Go to last post
  56. 2 way ANOVA with no interaction

    Hi, I have a data set with the following factors: Strain (1 depressive rat model, 2 control rat groups) and Region (8 brain regions) and receptor...

    Started by Theapl‎, 06-02-2014 04:48 AM
    no interaction, two way anova
    • Replies: 3
    • Views: 1,233
    06-02-2014, 06:31 AM Go to last post
  57. 2 way ANOVA, multiple response variables.

    Hello everyone, I would like to perform a 2-factor anova test, but I have some doubts. I'm working with mice in which we assess multiple...

    Started by Dusan11‎, 11-20-2012 01:50 PM
    • Replies: 2
    • Views: 3,962
    11-20-2012, 05:59 PM Go to last post
  58. 2 way ANOVA? or repeated measures ANOVA?

    Hi, sorry if this is really obvious, but I have this dataset i'm meant to analyse using prism, but I'm not sure i've done the right test? I'm...

    Started by katy12‎, 01-08-2013 01:21 PM
    • Replies: 3
    • Views: 1,975
    01-08-2013, 07:02 PM Go to last post
  59. 2 way cross classification ANOVA

    hey there, I need to suggest why when partitioning the total sum of squares in a 2 way cross classification ANOVA into the individual...

    Started by beast‎, 03-07-2006 05:58 PM
    • Replies: 1
    • Views: 3,822
    03-07-2006, 08:16 PM Go to last post
  60. Unhappy 2 way mixed anova

    im writing up a practical report on eating behaviours..ive analysed the results using a 2 way mixed anova,, dont know how to interpret it though.....

    Started by sophie786‎, 12-22-2007 04:52 PM
    • Replies: 1
    • Views: 3,831
    12-28-2007, 11:35 AM Go to last post

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