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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: 197,168
    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: 66,955
    09-30-2005, 09:44 AM Go to last post
  1. Statistical analysis between group after within group analysis?

    Hi guys, I have 3 groups and each group has its own pre-test and post-test. What I need to do is : after I compare pre-test and post test in each...

    Started by guntur777‎, 08-05-2010 08:24 PM
    • Replies: 4
    • Views: 8,526
    08-06-2010, 06:15 AM Go to last post
  2. Exclamation Case Study Help (statistics) PLEASE HELP

    The Voyage of the St. Andrew Throughout the picturesque valleys of mid-eighteenth-century Germany echoed the song of the Neuländer (newlander)....

    Started by sosme83‎, 04-27-2008 12:16 PM
    • Replies: 0
    • Views: 8,524
    04-27-2008, 12:16 PM Go to last post
  3. Estimating sample size for reliability study

    Hello, I'm having problems calculating the required sample size for my PhD study. I have designed my first study, which is comparing moral...

    Started by BG2‎, 03-05-2013 08:01 PM
    reliability, sample size, sample size determination, test-retest sample size, validity testing
    • Replies: 1
    • Views: 8,520
    06-15-2013, 02:11 PM Go to last post
  4. I really need help with this matched pairs experiment!

    Do consumers prefer the taste of a cheeseburger from McDonald's or from Wendy's in a blind test in which neither burger is identified? Describe...

    Started by xjinax8807‎, 11-14-2006 09:02 PM
    • Replies: 1
    • Views: 8,518
    11-15-2006, 03:20 PM Go to last post
  5. finding observance significance level

    Help i have a stats final and im not quite sure what to do to solve this problem: It has been estimated that the 1991 G-car obtains a mean of 35...

    Started by childst23‎, 04-21-2009 07:25 PM
    • Replies: 2
    • Views: 8,512
    04-21-2009, 09:25 PM Go to last post
  6. Box's test in MANOVA

    Hi, I have run MANOVA with 3 groups in the independent variables and 8 variables for the dependent variables. I have 4, 5, 5 subjects in each group...

    Started by Yoshi‎, 05-13-2011 09:37 AM
    box's test, manova
    • Replies: 3
    • Views: 8,488
    07-09-2013, 02:23 PM Go to last post
  7. Smile Confidence interval help please!!!

    Would you please help me with this problem? Study conducted for 26 weeks. df 26-3-1 = 24 tcrit= 2.0639 Construct a 95% confidence...

    Started by sweetheart‎, 08-06-2010 08:13 PM
    • Replies: 3
    • Views: 8,478
    08-06-2010, 11:18 PM Go to last post
  8. two way ancova problem

    I have to analyze a set of data, and while I know roughly what I'm doing, I am having some problems making conclusions. I will outline the data and...

    Started by boogers‎, 09-28-2009 08:44 AM
    • Replies: 7
    • Views: 8,472
    09-28-2009, 02:39 PM Go to last post
  9. when to use the median and when the mean ?

    Good morning, I have an assignment, I need to specify with examples, in which situation the mean is the best central measure and in which the...

    Started by Yankel‎, 01-06-2012 08:43 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 8,469
    01-08-2012, 01:25 PM Go to last post
  10. please help! Fmax statistic!!!!

    Hi I am doing a two way anova assignment and need to do the fmax for the six treatment groups. For the fmax statistic, you need the df for each 6...

    Started by izzy99‎, 02-10-2009 03:54 PM
    • Replies: 1
    • Views: 8,466
    02-10-2009, 04:24 PM Go to last post
  11. Mardia's Multivariate Normality test interpretation

    Hello I obtained the macros for doing Mardia's Multivariate Normality test in spss from this website: http://www.columbia.edu/~ld208/ the...

    Started by mohsenn‎, 10-22-2010 10:29 AM
    • Replies: 0
    • Views: 8,462
    10-22-2010, 10:29 AM Go to last post
  12. Scheffe critical value question (easy)

    A researcher collects data about the efficacy of a new medication for ADHD in the context of an existing medication, a placebo, and no treatment. She...

    Started by jj09‎, 08-27-2010 12:05 AM
    • Replies: 2
    • Views: 8,460
    08-30-2010, 10:37 PM Go to last post
  13. Regression through the origin?

    Hi guys I am wondering what does "Regression through the origin" means in the real world practice? I've been researching on it and found out...

    Started by bkk‎, 01-08-2011 10:03 AM
    • Replies: 6
    • Views: 8,460
    01-09-2011, 06:55 AM Go to last post
  14. combining frequency and agreement likert scales

    Hi I have a four item construct in a survey I am working on. 3 of the items are measured using a frequency likert scale (never, rarely,...

    Started by sk0412‎, 12-21-2008 11:00 PM
    • Replies: 0
    • Views: 8,459
    12-21-2008, 11:00 PM Go to last post
  15. Post Interaction effects one way ANOVA

    HI, Just wiondering, is it possible to have interaction efefct in one way ANOVA? I think it is a bit not logic but I need confirmation. Thanks!...

    Started by lynnar‎, 02-19-2012 04:42 AM
    interaction effetcs, one way anova
    • Replies: 3
    • Views: 8,455
    02-19-2012, 09:07 AM Go to last post
  16. Help - questions re: Empirical Rule/Chebyshev

    Hello: Does anyone know how to approach these problems? Any help would be greatly appreciated. The mean IQ of 200 patients in a psychiatric...

    Started by skhan‎, 05-06-2006 05:12 PM
    • Replies: 5
    • Views: 8,454
    05-08-2006, 08:34 AM Go to last post
  17. Unbiased estimator

    Consider the uniform distribution on . Find an unbiased estimator for \theta based on the geometric mean of a sample of size n: ...

    Started by xenophobia‎, 03-10-2010 12:19 AM
    • Replies: 2
    • Views: 8,430
    03-10-2010, 10:13 AM Go to last post
  18. Sampling Procedure Help Needed for Constructing a Confidence Interval

    Hi all. Quick background: I am a 64 year old lady going back to college to get my Bachelor's. I haven't taken a college course in 30 years :shakehead...

    Started by jjonesfk‎, 07-18-2013 12:06 PM
    • Replies: 8
    • Views: 8,429
    07-26-2013, 12:49 PM Go to last post
  19. repeated-measures t statistic

    What values can be estimated using the repeated-measures t statistic? a) the value of an unknown population mean b) the difference between two...

    Started by starfish794‎, 11-27-2006 12:42 PM
    • Replies: 1
    • Views: 8,424
    11-27-2006, 03:22 PM Go to last post
  20. Help with this one, please?

    Suppose certain coins have weights that are normally distributed with a mean of 5.358 g and a standard deviation of0.052 g. A vending machine is...

    Started by MotherBear1975‎, 11-20-2008 10:54 PM
    • Replies: 3
    • Views: 8,420
    11-21-2008, 01:03 AM Go to last post
  21. Phi and Cramer's V

    There must be something I'm not getting with these measures of association for nominal variables. Please help me understand. What I've got so far...

    Started by rt-sails‎, 10-27-2011 06:05 PM
    • Replies: 4
    • Views: 8,418
    11-03-2011, 02:27 PM Go to last post
  22. This is probably easy for you but very hard for me!

    Can someone please help me figure out how to do this problem? A professor knows that from past experience that the time for students to complete a...

    Started by Caroyer1‎, 02-22-2014 12:47 PM
    z-table, z-test
    • Replies: 6
    • Views: 8,413
    02-22-2014, 02:10 PM Go to last post
  23. Help: STATISTICS- HYPOTHESIS TESTING PAPER

    Question: JUST an INTRO paragraph on THE SUCCESS RATES IN ONLINE STUDENTS....it is for the following paper, but I only need an INTRO PARAGRAPH ...

    Started by maryshaer‎, 07-18-2010 06:56 AM
    • Replies: 1
    • Views: 8,410
    07-18-2010, 06:41 PM Go to last post
  24. Exclamation T-scores, n1, n2, and probability

    Maybe this should have gone in the probability section, but I'm not sure... soo... here ya go. I hope someone can help, I have an exam tomorrow. ...

    Started by magic_shield2001‎, 04-18-2011 12:26 AM
    t-score
    • Replies: 0
    • Views: 8,407
    04-18-2011, 12:26 AM Go to last post
  25. interpret SPSS results - Logistic Regression, Classification Table

    What does the following mean?

    Started by iknowu99‎, 03-22-2009 02:54 PM
    • Replies: 0
    • Views: 8,404
    03-22-2009, 02:54 PM Go to last post
  26. What is the difference between an odds ratio and a risk ratio?

    Hi - struggling to understand what the difference is between an odds ratio and a risk ratio? :confused: Can anyone help? Thanks!

    Started by Rose‎, 10-11-2011 01:00 AM
    • Replies: 2
    • Views: 8,395
    10-11-2011, 03:45 PM Go to last post
  27. Box's Test sig .000 - now what?

    I'm running a manova (teaching myself along the way) and I can't seem to get a handle on something - I'm not sure if I'm having a sample size problem...

    Started by mjgray‎, 01-18-2013 03:03 AM
    • Replies: 13
    • Views: 8,395
    02-24-2013, 06:31 PM Go to last post
  28. Derive Expected Value of Yhat

    Yhat = 1/n Derive E(Yhat) and show that Var(Yhat) = ((1.25σ^2)/n) I don't know how to work with the constants to get the Expected Value and...

    Started by alias‎, 11-04-2011 12:54 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 8,392
    11-06-2011, 05:50 AM Go to last post
  29. t-test on geometric means?

    I have 2 groups of dilutions (titres) that I would like to compare. The thing is, the mean for titres is usually the geometric one so I feel that I...

    Started by mousme‎, 07-13-2011 12:04 PM
    • Replies: 1
    • Views: 8,386
    07-13-2011, 01:30 PM Go to last post
  30. help pleaseeeeeeeee

    Find the probability that in 200 tosses of a fair six-sided die,a five will be obtained at most 40 times. A)0.8810 B)0.1190 C)0.0853 D)o.9131 ...

    Started by stat help‎, 04-12-2008 09:50 PM
    • Replies: 2
    • Views: 8,385
    04-14-2008, 12:47 PM Go to last post
  31. When/ when not to use Z scores to compare data

    In comparing 2 groups of numbers, could you give me any examples of when would it be (1) beneficial (2) when it would not be beneficial to first...

    Started by alexis2‎, 12-12-2010 01:28 PM
    • Replies: 4
    • Views: 8,384
    12-12-2010, 06:10 PM Go to last post
  32. Use of Tukey-Kramer

    In the context of one-way ANOVA, when should the Tukey Kramer procedure not be used?

    Started by MooseMan‎, 07-24-2008 09:47 AM
    • Replies: 1
    • Views: 8,380
    07-25-2008, 12:12 AM Go to last post
  33. One Way ANOVA with grouping using Tukey method.

    Hello! I have conducted One way ANOVA using Tukey method in minitab. I am now interpreting the grouping results. I am a bit confused. If the...

    Started by Rebecka‎, 04-18-2012 12:33 PM
    • Replies: 2
    • Views: 8,372
    04-18-2012, 01:13 PM Go to last post
  34. Poisson distributions additive??

    I have two Poisson distributions with different means. I want to combine them. Can I assume that the resulting distribution is also a Poisson? ...

    Started by sdsmith‎, 03-26-2008 04:52 PM
    • Replies: 3
    • Views: 8,371
    03-26-2008, 05:28 PM Go to last post
  35. Smile Application of T-Distribution

    Hello Guys, Ok. I have never came across a situation like this before so I am not quite sure if I could use T-Distribution to construct a...

    Started by jimmy0ad‎, 06-24-2010 09:04 AM
    • Replies: 2
    • Views: 8,371
    06-28-2010, 02:12 AM Go to last post
  36. Smile Joint CDF's and pdf problem

    I am trying to solve part of a question whicg goes as: Q: Suppose X and Y are two continuous random variables whose joint density function is ...

    Started by hmm...chocolate..‎, 08-11-2006 05:00 PM
    • Replies: 7
    • Views: 8,369
    09-02-2006, 12:18 PM Go to last post
  37. Census vs. Sample

    I am looking for more clarification on how a census survey is usually analyzed and reported. While there is a lot of information on how to go about...

    Started by apdragon‎, 11-03-2009 04:50 PM
    • Replies: 7
    • Views: 8,369
    05-07-2012, 04:03 AM Go to last post
  38. Percentile Help

    I am lost on this one. Please help. Find the percentile for the data point Data Set: 4, 13, 10, 6, 4, 4, 13, 6, 4, 13, 2, 13, 15, 5, 9, 4, 12,...

    Started by Melissa920‎, 03-07-2006 12:41 PM
    • Replies: 4
    • Views: 8,358
    01-16-2008, 09:35 PM Go to last post
  39. Question Interpretation of a Q-Q plot and Shapiro-Wilk test

    I have the following output from a shapiro-wilk test: Shapiro-Wilk normality test data: goalTime W = 0.9486, p-value = 0.05751 And the Q-Q plot...

    Started by truetaurus‎, 12-09-2012 06:18 AM
    mathematics, normal-distribution, r-programming, statistics
    • Replies: 3
    • Views: 8,357
    12-09-2012, 10:06 AM Go to last post
  40. Help with statistics homework?

    1). If the hypothesis test is conducted using α = .025, this means that: a. there is a 2.5% chance that the null hypothesis is true b. there is a...

    Started by madden‎, 05-29-2010 06:46 PM
    • Replies: 1
    • Views: 8,355
    05-30-2010, 02:43 AM Go to last post
  41. Minimum number of replicates required to calculate the standard error of the mean

    Hi, I know how to calculate the standard error of the mean, and was happily doing so with some of my data when a colleague said it was not...

    Started by douglas.quaid‎, 03-14-2009 07:50 PM
    • Replies: 0
    • Views: 8,348
    03-14-2009, 07:50 PM Go to last post
  42. Skewness "rules of thumb"

    I'd like to get an expert evaluation of these two statements: 1. If the mean of a distribution is greater than both the mode and the median, you...

    Started by mgloss‎, 09-28-2010 11:53 AM
    • Replies: 2
    • Views: 8,345
    10-20-2010, 08:55 AM Go to last post
  43. Testing if median of a sample equals zero

    Hello, I would like to ask you for your opinion the following problem. (My knowledge of statistics is more or less basic.) There is a sample with...

    Started by mimes‎, 05-12-2008 04:25 PM
    • Replies: 2
    • Views: 8,343
    05-13-2008, 02:29 PM Go to last post
  44. New Here- Need some help with chebyshev's theorem

    The average number of pages in a mystery book is 220 with a standard deviation of 20. Using Chebyshev's Theorem, what is the range of values in which...

    Started by OsoBlanco‎, 02-17-2008 04:21 PM
    • Replies: 1
    • Views: 8,339
    02-21-2008, 08:44 AM Go to last post
  45. Minimum sample size log normal distribution

    I am working with a group here and have a relatively simple question. We know the p90 and p10 of our distributions and usually think the...

    Started by fracmeister‎, 08-16-2010 05:44 PM
    • Replies: 4
    • Views: 8,339
    08-17-2010, 10:09 AM Go to last post
  46. sample mean z-score

    If a sample is selected from a normal population, then the probability that the sample mean will have a z-score less than z=2.55 is.......?

    Started by starfish794‎, 11-12-2006 03:01 PM
    • Replies: 1
    • Views: 8,333
    11-13-2006, 12:35 AM Go to last post
  47. Why does the determinant always equal zero for a matrix of consecutive numbers?

    Hi. Why does the determinant always equal zero for a matrix of consecutive numbers? This applies whether the consecutive numbers are in the matrix...

    Started by joshAU‎, 07-31-2011 08:28 AM
    consecutive, consecutive number, determinant, matrix, matrix algebra
    • Replies: 2
    • Views: 8,321
    07-31-2011, 07:29 PM Go to last post
  48. Multivariate Regression - I think!

    Hi, I'm performing a psychological study about gender differences in attraction. Participants select between a number of figures that vary in...

    Started by iporter‎, 02-10-2006 02:39 PM
    2 Pages
    1 2
    • Replies: 22
    • Views: 8,306
    03-03-2006, 12:28 PM Go to last post
  49. Mixed models: Calculating ICC for model with a random intercept and a random slope

    Hello All, I have a question about how to calculate an intraclass correlation coefficient in a mixed model that has both a random intercept and a...

    Started by pjmiller_57‎, 09-18-2012 12:02 PM
    • Replies: 8
    • Views: 8,295
    08-14-2017, 06:26 PM Go to last post
  50. Explanation of ANOVA test results please

    I have just done an ANOVA (single factor) in Excel. Could someone please explain the following terms: SS df MS F

    Started by Layo909‎, 04-21-2011 04:54 AM
    • Replies: 2
    • Views: 8,282
    04-21-2011, 01:14 PM Go to last post
  51. Mahalanobis vs. cook's distance

    Hi, I just ran a linear regression analyses with 4 variables (baseline variables predicting wave 4 drop out). When looking at the casewise...

    Started by jwm1‎, 02-09-2009 10:58 AM
    • Replies: 0
    • Views: 8,277
    02-09-2009, 10:58 AM Go to last post
  52. How to E= 0 and Var = 1 in a standardized normal distribution?

    I wanna prove that expectation and variance of a standard normal distribution are 0 and 1, respectively. It seems there is no way to do it...

    Started by iamsevenup‎, 09-16-2008 11:03 PM
    • Replies: 4
    • Views: 8,271
    09-17-2008, 08:52 PM Go to last post
  53. Wink $60 - tutor wanted

    $60 an hour. R code Logistic and Poisson Regression Central Limit Theorem ANOVA Single, two pop tests Simple and Multiple Linear Regression...

    Started by duval‎, 12-02-2011 04:14 PM
    3 Pages
    1 2 3
    • Replies: 36
    • Views: 8,267
    12-03-2011, 01:44 PM Go to last post
  54. Critical z value problem

    Need help with this problem Assume that the data has a normal distribution and the number of observations is greater than fifty. Find the...

    Started by maharriso‎, 11-07-2006 12:02 PM
    • Replies: 2
    • Views: 8,260
    02-15-2009, 10:35 AM Go to last post
  55. Random Walk on a Circle - Show distribution of X_TN is uniform? Help please!

    Hello, I am trying to solve the following problem: Consider the simple random walk on the circle {0,1,...,N-1} started at 0. Show the...

    Started by bailey77‎, 09-28-2011 09:45 AM
    • Replies: 2
    • Views: 8,255
    09-28-2011, 04:29 PM Go to last post
  56. Principal Components Analysis (psychology) - negative loadings?

    Hi there, I'm attempting to do dimension reduction/data reduction with PCA. The goal is to extract "factor" scores to use as independent variables...

    Started by sara_pu‎, 12-23-2009 01:36 PM
    • Replies: 2
    • Views: 8,236
    07-01-2010, 01:55 PM Go to last post
  57. 3-way interaction: calculation of the SEb

    Hello, Im working on the statistics of my thesis and I am afraid Im stuck. I conducted a regression analysis with three-way interaction and now I...

    Started by michielfz‎, 08-06-2009 01:17 PM
    • Replies: 4
    • Views: 8,229
    08-10-2009, 01:22 AM Go to last post
  58. Red face please help me with this!!

    The centers for disease control say that about 30% of highschool students smoke tobacco (down from a high of 38% in 1997). Suppose you randomly...

    Started by tricia08‎, 02-17-2008 09:22 PM
    • Replies: 2
    • Views: 8,227
    02-17-2008, 11:59 PM Go to last post
  59. Sample Overlap - what is the effect on stat tests?

    A survey was done. 1000 respondents. 250 were younger males. 250 were younger females. 250 were older males. 250 older were females. I want to...

    Started by egret‎, 09-14-2011 03:22 PM
    • Replies: 3
    • Views: 8,222
    09-16-2011, 06:11 AM Go to last post
  60. Showing that its an unbiased estimator..

    Hey guys....bit stuck on something - i'm having trouble showing that the difference of two population means ie. (y2-y1) (with hats on top) is an...

    Started by xXrebeccXx‎, 10-14-2010 04:58 PM
    • Replies: 2
    • Views: 8,221
    10-14-2010, 09:00 PM Go to last post

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