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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: 197,089
    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: 66,920
    09-30-2005, 09:44 AM Go to last post
  1. 3-way vs 2-way ANOVA

    I have done a 2-way ANOVA to check the impact of my 2 treatments (EXP, 2groups and INFO, 3 groups) on my dependent variable and got significant main...

    Started by anny‎, 07-30-2012 01:34 AM
    • Replies: 0
    • Views: 1,870
    07-30-2012, 01:34 AM Go to last post
  2. Thumbs up 33- and 66-percentile in Prism Graphpad

    Hi Any one who knows how I can do 33- or 66-precentile in Prism Graphpad? Or if there other easy way to do that in other programs? Thank you...

    Started by moalz04‎, 11-21-2013 02:29 PM
    • Replies: 0
    • Views: 1,003
    11-21-2013, 02:29 PM Go to last post
  3. 3rd Quartile

    HI, I need some help with this one please: X1,...Xn ~ N( mu, sigma^2 ) both mu=E(Xi) and sigma^2=Var(Xi) are unknown I need to find a...

    Started by WeeG‎, 06-02-2009 03:15 PM
    • Replies: 5
    • Views: 4,479
    06-04-2009, 10:25 AM Go to last post
  4. 3SD Points

    Hi Guys, Glad I found you, i am needing some advice. I havent used stats in I dont know how long but have been asked to provide a graph to 3SD. ...

    Started by geemacd‎, 11-14-2006 10:40 AM
    • Replies: 6
    • Views: 3,958
    12-01-2006, 11:34 AM Go to last post
  5. 3SLS method

    Dear members: I am reading a report on an econometric analysis that has been carried out for fish industry. I am not familiar with 3SLS. I...

    Started by mimilafleur‎, 04-25-2007 09:54 AM
    • Replies: 0
    • Views: 2,687
    04-25-2007, 09:54 AM Go to last post
  6. 3x3 Grid to show relationship?

    I have tried to create a model combining 2 social theories with 3 categories to form a 3x3 grid. I then created a survey with mainly used 5 point...

    Started by SPSS Newbie‎, 10-03-2011 04:29 PM
    • Replies: 1
    • Views: 5,232
    10-04-2011, 11:32 AM Go to last post
  7. Question 3x3 within subjects categorical design Chi-square inappropriate?

    As a final report for an experimental methodologies class, I have gathered data from a self-constructed experiment on categorical attribution. The...

    Started by RasmusHoell‎, 01-10-2011 10:53 AM
    • Replies: 0
    • Views: 85,087
    01-10-2011, 10:53 AM Go to last post
  8. Question 3^2 factorial design, just one treatment with replicas, help?

    Hello al! I would appreciate if you could help me, I have this experiment with two factors, every factor with 3 levels, so in total there are 9...

    Started by garcia.saul‎, 12-11-2012 08:25 AM
    • Replies: 0
    • Views: 825
    12-11-2012, 08:25 AM Go to last post
  9. 4 continuous IVs predicting a single binary DV

    Like the title says... I have 4 continuous IVs, whose combined effects (i.e. interactions possible) should predict a binary DV (possible values 1...

    Started by fizix‎, 12-14-2012 02:04 PM
    binary dependent variable
    • Replies: 9
    • Views: 2,024
    12-14-2012, 07:44 PM Go to last post
  10. 4 Data Points and Estimate the Next

    I have a problem that gives me 4 data points and a 5th that I should use to estimate. The 4 data points are revenue totals for prior years. I also...

    Started by JFan76‎, 10-18-2013 05:38 PM
    • Replies: 0
    • Views: 982
    10-18-2013, 05:38 PM Go to last post
  11. 4 groups test - is it possible?

    My problem - I have conducted an experiment which grows Water Cress in 6 different growing mediums (sand, gravel, stone, peat, compost,...

    Started by slippy‎, 02-22-2008 05:36 PM
    2 Pages
    1 2
    • Replies: 22
    • Views: 4,622
    03-10-2008, 11:31 AM Go to last post
  12. 4 sets of true/false data

    I just need a hint .. I have 19 subjects, and I have performed 4 types of examinations on each of them - trying to measure the same parameter...

    Started by amir.z‎, 02-21-2009 02:33 PM
    • Replies: 1
    • Views: 1,530
    02-26-2009, 03:13 AM Go to last post
  13. 4 times the same experiment with 4 conditions in each experiment: 2-way ANOVA?

    I have run 4 times the same experiment and in each experiment I have the same 4 conditions. In each group, in each experiment, I have 3 to 5 mice. I...

    Started by mousme‎, 11-06-2012 08:51 AM
    • Replies: 2
    • Views: 1,331
    11-08-2012, 06:21 AM Go to last post
  14. 4 treatment types, four possible outcomes, and ran experiment 3 times

    I am circling through choices of analyzing. I have a ran the experiment 3 times and the same similar numbers come up for each experiment. The...

    Started by Blaize‎, 05-21-2014 07:07 PM
    • Replies: 0
    • Views: 1,267
    05-21-2014, 07:07 PM Go to last post
  15. 4 unbalanced groups. Bonferroni/Tukey with proc glm okay to compare means?

    The data is right skewed (all groups). Need to compare means. 3 groups have 300 observations each but the 4th group has only 100. Will a proc glm...

    Started by StatsClue‎, 03-27-2012 05:03 PM
    • Replies: 12
    • Views: 4,296
    03-31-2012, 04:37 PM Go to last post
  16. 4 variables, 2 surveys.. how to link? please help!

    hi :wave: i have 2 surveys. The data is collected from both managers and subordinates, the first one has just one variable (moderator) and the 2nd...

    Started by Susielola‎, 09-16-2014 07:08 PM
    analysis method, data analysis, dissertation, masters degree, statistical analysis
    • Replies: 2
    • Views: 1,529
    09-19-2014, 07:18 PM Go to last post
  17. 4 Vowel Intensities, Amplitude Spectrum of EEG - Multiple Logistic Regression?

    I have EEG recordings of the neural response to speech (a male vowel with a fundamental frequency of 100Hz). The vowel was presented to each subject...

    Started by Hydrus‎, 02-05-2014 02:39 PM
    logistic regression, neuroscience, statistics
    • Replies: 0
    • Views: 812
    02-05-2014, 02:39 PM Go to last post
  18. 4th-variance?

    Hello any and all, I am no statistician so does the term "4th-variance" mean anything to someone? I am attempting to replicate the technique found...

    Started by barfknechtj‎, 03-24-2014 01:49 PM
    expectation, moments, variance
    • Replies: 0
    • Views: 1,647
    03-24-2014, 01:49 PM Go to last post
  19. 5 factor, 3 level experimental design

    Hello all, firstly I would like to thank in advance anybody who is able to help me with my problem. I am having trouble in finding the correct...

    Started by harrymultak‎, 08-25-2009 09:55 AM
    • Replies: 0
    • Views: 4,437
    08-25-2009, 09:55 AM Go to last post
  20. 5 Step Hypothesis Testing

    I am taking this course through distance education and Hypothesis testing has been hard to learn on my own. Please help me show the 5 steps to find a...

    Started by fantasydawn‎, 11-26-2006 05:32 PM
    • Replies: 3
    • Views: 4,745
    11-26-2006, 06:09 PM Go to last post
  21. 5% vs 10% significance level

    For hypothesis testing which one is considered stricter 5% significance level or 10% significance level. I know its a very basic question but it...

    Started by sak‎, 07-19-2012 05:00 PM
    significance level
    • Replies: 6
    • Views: 34,796
    07-21-2012, 03:13 PM Go to last post
  22. 5-point likert scale

    i am currently carrying out a study for my dissertation for my physiotherapy degree I devised a questionnaire using the 5-point likert scale...

    Started by arcole‎, 01-04-2008 10:16 AM
    • Replies: 2
    • Views: 6,856
    03-18-2008, 03:34 AM Go to last post
  23. 50$$$ to the person who can help me answer 3 questions.

    willing to paypal 50$$$ to the person who can help me answer 3 questions. :) 1, The mean weight of 9 randomly selected 5 years old boys babies...

    Started by karkid‎, 12-06-2011 01:12 PM
    3 Pages
    1 2 3
    • Replies: 31
    • Views: 7,638
    02-08-2012, 08:55 AM Go to last post
  24. 6 Degrees in Social Media

    I believe this is a statistics question. Does anyone know how many Facebook fans you have to have until a random user registering with Facebook...

    Started by ayatzi‎, 10-25-2010 06:10 PM
    • Replies: 0
    • Views: 2,230
    10-25-2010, 06:10 PM Go to last post
  25. 6 out of 6

    Anyone buy this argument? Thoughts? I'd like some way to write it up and this is my best shot .... A certain validation procedure requires a...

    Started by Philyuko‎, 01-30-2012 09:56 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 4,228
    02-02-2012, 01:04 AM Go to last post
  26. 6 Ways to Address Collinearity in Regression Models

    Recently came across this article regarding dealing with Collinearity. Does anyone have an opinion on what is the best method? ...

    Started by stats4cool‎, 09-08-2013 03:36 PM
    collinearity, regression
    • Replies: 0
    • Views: 793
    09-08-2013, 03:36 PM Go to last post
  27. 6 Widget Producing Machines - How often one machine produces the most/above average

    I'm looking to be able to calculate (not simulate) how often a sample from one distribution exceeds the sample of multiple other distributions. I am...

    Started by coursonb‎, 07-15-2015 10:20 PM
    • Replies: 3
    • Views: 1,553
    09-24-2015, 11:33 AM Go to last post
  28. 68-95-99.7 rule

    I have finally figured out the standard deviation and think I am getting the hang of distribution on a bell-shaped curve. What I don't understand...

    Started by jenclark242‎, 09-24-2010 08:59 AM
    • Replies: 7
    • Views: 5,823
    09-27-2010, 12:39 PM Go to last post
  29. 76 percent per 1,000 women aged 15-19, U.S

    Hello everyone, I am mathematically and statically challenged beyond belief. So, please riddle me this: If you look at the first paragraph of...

    Started by Naviva‎, 10-18-2012 10:30 AM
    • Replies: 4
    • Views: 1,649
    10-18-2012, 03:12 PM Go to last post
  30. 80% configence interval

    Hi all, Question: In a report on why e-shoppers abandon their online sale transactions, a study found that “pages took me much time to load”...

    Started by Tjvelcro‎, 11-12-2010 10:48 PM
    • Replies: 2
    • Views: 4,009
    11-13-2010, 09:14 AM Go to last post
  31. 82% Confidence Interval

    Over the last 15 Major League Baseball seasons, the mean # of strikeouts by the American League leader is 258.5. Assuming that the # of strikeouts by...

    Started by ridley1013‎, 06-22-2008 03:18 PM
    • Replies: 2
    • Views: 22,770
    06-22-2008, 08:40 PM Go to last post
  32. 90% Confidence Problem

    This is the question I am struggling with, it is from a set of practice questions but I am trying to understand how to do this for my upcoming exams,...

    Started by CateB9‎, 09-25-2017 05:49 AM
    • Replies: 1
    • Views: 226
    09-25-2017, 02:38 PM Go to last post
  33. 90% VS 99% Confidence Interval

    To create confidence intervals using the normal distribution, if the area alpha/2 is not in the table and it is exactly in between two areas, should...

    Started by Weiss‎, 02-29-2016 09:44 PM
    90% confidence interval
    • Replies: 3
    • Views: 1,088
    03-01-2016, 10:29 AM Go to last post
  34. 95 % confidence region of F distribution

    Hi Dear, I have to determine the 95 per cent confidence region of my best fitting model from a table that follow an F-distribution. The table look...

    Started by seismo‎, 08-30-2011 03:42 AM
    • Replies: 0
    • Views: 2,911
    08-30-2011, 03:42 AM Go to last post
  35. 95% CI- correct for uncertainty?

    Here is a tricky question (at least for me). Let's say I'm observing that 100/2000 samples tested with test A are positive for virus X. But as this...

    Started by Jka‎, 12-05-2013 05:46 AM
    • Replies: 0
    • Views: 1,568
    12-05-2013, 05:46 AM Go to last post
  36. 95% confidence interval

    I'm not sure how to construct a 95% confidence interval for a one tailed test. I know that for a two tailed test, it's just the critical value...

    Started by ajk003‎, 03-03-2006 03:07 PM
    • Replies: 1
    • Views: 3,046
    03-03-2006, 03:13 PM Go to last post
  37. 95% confidence interval

    Hey all, I finished studying a whole chapter on confidence interval and was feeling happy to be finally able to answer most of the questions at...

    Started by obscene‎, 10-30-2010 10:26 PM
    • Replies: 2
    • Views: 3,161
    11-01-2010, 06:48 PM Go to last post
  38. Question 95% Confidence Interval for Regression Coefficients Question

    Hello all, I have been trying to figure out how to answer these homework questions for far too long and happened upon this forum with hopes...

    Started by mariposanegra17‎, 11-04-2013 06:44 PM
    • Replies: 1
    • Views: 1,631
    11-06-2013, 02:22 PM Go to last post
  39. 95% confidence interval help

    How much money does the average professional football fan spend on food at a single football game? That question was posed to ten randomly selected...

    Started by sinful‎, 10-25-2006 04:50 PM
    • Replies: 8
    • Views: 9,155
    10-25-2006, 09:36 PM Go to last post
  40. 95% Confidence Intervals

    Hey, I've been searching the web frantically for the last hour trying to find out how you calculate the 95% CI for a 2x2 Within Group ANOVA and a...

    Started by Kakazam‎, 03-29-2014 05:53 PM
    • Replies: 2
    • Views: 1,243
    03-29-2014, 06:59 PM Go to last post
  41. 95% confidence range

    Hi all, I have a fairly limited background in statistics and am stuck and confused by a question on a homework assignment. We are given a list of...

    Started by rxg5097‎, 02-13-2012 06:26 PM
    • Replies: 0
    • Views: 3,351
    02-13-2012, 06:26 PM Go to last post
  42. 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: 8,551
    04-13-2010, 10:30 AM Go to last post
  43. 99% Confidence Interval + Last question, I really need help please

    A random sample of 200 individuals working in a large city indicated that 50 are dissatisfied with their working conditions. Based upon this, compute...

    Started by melshine‎, 03-25-2008 05:04 PM
    • Replies: 1
    • Views: 2,456
    03-25-2008, 06:05 PM Go to last post
  44. :( help

    im wondering if anyone can help me with 2 questions i have. A tire claims that the tires of its tires are normally distrubuted and will last an...

    Started by sinabun12si‎, 02-06-2011 06:17 PM
    • Replies: 2
    • Views: 2,150
    02-06-2011, 06:45 PM Go to last post
  45. :confused: HELP!!!!

    I don't know how to start. I just really need to be pointed in the right direction: Question: Alana, Barry, and Cyndi have each applied for...

    Started by sweetx‎, 11-21-2008 09:42 PM
    • Replies: 2
    • Views: 2,243
    11-26-2008, 08:53 AM Go to last post
  46. ? paired sample comparisons

    My question about paired sample comparisons is about finding the difference in the data between collum A and collum B. What I would like to know is...

    Started by pugowner‎, 10-22-2008 04:54 AM
    • Replies: 2
    • Views: 2,572
    10-22-2008, 07:15 AM Go to last post
  47. ?Test for consistency and showing trend/pattern

    Hi I need help with the following experiment. I am measuring 3 parameters from a few subjects n=6, say they are measurement A, B and C. ...

    Started by chancy‎, 04-26-2010 05:04 AM
    • Replies: 0
    • Views: 2,386
    04-26-2010, 05:04 AM Go to last post
  48. A (probably very basic) question...

    Hello, Sorry if this is not the correct place to post this. I have a binomial stats question that I just cannot get to grips with at all and I'm...

    Started by jdrewind‎, 01-01-2017 10:39 AM
    • Replies: 3
    • Views: 2,823
    01-02-2017, 02:56 AM Go to last post
    • Replies: 0
    • Views: 1,742
    12-02-2010, 07:37 PM Go to last post
  49. A basic question with no concrete solutions out there

    Hi AFAK multiple comparisons need fixing the type I error rate, either by correcting the level of significance, or modifying the calculated P. ...

    Started by victorxstc‎, 10-26-2011 04:15 AM
    • Replies: 1
    • Views: 4,269
    10-26-2011, 06:38 AM Go to last post
  50. Red face A basketball team problem

    Hello! Please help me in this problem: A basketball team with 11 players of different heights trades its shortest player to another team for a...

    Started by AlexKom‎, 11-23-2005 12:02 AM
    • Replies: 1
    • Views: 4,703
    11-23-2005, 12:14 AM Go to last post
  51. A bayesian statistics question

    I have a question im trying to work through, but im not too sure how to start it off. the question is related to scientists studying populations of...

    Started by bryce09‎, 09-08-2012 05:18 PM
    bayesian, statistics query
    • Replies: 6
    • Views: 1,104
    09-08-2012, 06:40 PM Go to last post
  52. A big problem for smart people

    I have two possibilities; X1 and X2. The question is: If you know that X1 gives you 0 then what does X2 give you? I set up a table: ...

    Started by mandarine‎, 09-25-2009 02:03 PM
    • Replies: 0
    • Views: 9,999
    09-25-2009, 02:03 PM Go to last post
  53. Question A binomial toughie

    Hi guys, could someone people help me with this hard problem? I read fundamentals of biostatistics by posner (revelant sections), did some google...

    Started by statdude0‎, 04-14-2013 02:12 AM
    • Replies: 0
    • Views: 991
    04-14-2013, 02:12 AM Go to last post
  54. A biomedical experiment problem

    Dear people, I am currently doing a biomedical study where there are 4 different treatment. Sham operation, A, B and (A+B). Each treatment have...

    Started by yuppy‎, 03-06-2006 02:43 AM
    • Replies: 3
    • Views: 2,265
    03-06-2006, 09:13 PM Go to last post
  55. A bit basic but....Help!

    Honestly this problem put me into a stump. I'm used t having set of data values, but now I'm just confused on this. I am just starting statistics so...

    Started by exkingb12‎, 05-06-2013 06:10 PM
    • Replies: 1
    • Views: 3,269
    05-06-2013, 06:48 PM Go to last post
  56. 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: 1,775
    10-15-2012, 03:19 PM Go to last post
  57. a book which introduce neural network?

    Dear all, I am currently working on model specification for neural networks and so look for a book which introduces neural networks including...

    Started by t.wang21@yahoo.com.au‎, 04-15-2015 10:23 PM
    • Replies: 0
    • Views: 938
    04-15-2015, 10:23 PM Go to last post
  58. A calculation of two groups Pt.2? Please help!

    The same supervisor wanted to be certain that the group without Flextime would be affected the same way so the following week she introducted it to...

    Started by Wood‎, 07-20-2007 03:14 PM
    • Replies: 0
    • Views: 1,677
    07-20-2007, 03:14 PM Go to last post
  59. A calculation of two groups? Please help!

    A supervisor wants to determine whether flextime will affect production so she selects a group of 20 employees, randomly assigns them to either...

    Started by Wood‎, 07-20-2007 03:08 PM
    • Replies: 0
    • Views: 1,828
    07-20-2007, 03:08 PM Go to last post

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