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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: 196,558
    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: 66,617
    09-30-2005, 09:44 AM Go to last post
  1. treatment and control variables?

    I am using an on-line effect size calculator and it asks for the M and SD of the treatment and control variables. Is treatment another term for...

    Started by godfather‎, 02-21-2009 03:20 AM
    • Replies: 1
    • Views: 7,595
    02-21-2009, 10:14 AM Go to last post
  2. Uniform Distribution Problem(s)

    I just spent at least an hour and confused myself more than anything on the problem below. Upon using the formula f(x)=1/b-a you get 1/10 (.1). For...

    Started by blackhawk98ss‎, 10-18-2011 08:32 PM
    • Replies: 4
    • Views: 7,594
    10-19-2011, 11:29 PM Go to last post
  3. Average of Averages?

    This is as much a philosphical question as it is a stats question. I am analyzing some cleaning evolutions. Each cleaning evolution has a final cost....

    Started by MrGibbage‎, 12-29-2011 12:52 PM
    • Replies: 1
    • Views: 7,594
    12-29-2011, 04:01 PM Go to last post
  4. total deviation of the sum of unrelated means

    As a starter - I am a newbie to this forum (and forums in general). Also, I have a very (very) basic understanding of stats/prob. Thank you in...

    Started by blewsman‎, 06-01-2012 06:46 PM
    • Replies: 2
    • Views: 7,592
    06-04-2012, 02:07 PM Go to last post
  5. Absence of interaction. Planned comparisons.

    Hi, I'm doing data analysis for one of my experiments. The design of the experiment is 2 (word frequency) x 3 (phrase type). Both main effects (word...

    Started by Anya‎, 05-13-2008 01:22 PM
    • Replies: 6
    • Views: 7,589
    05-15-2008, 03:31 AM Go to last post
  6. Confidence Interval

    A nutrition researcher wants to determine the mean fat content of henís eggs. She collects a sample of 40 eggs. She calculates a mean fat content...

    Started by Twill‎, 10-27-2007 01:50 PM
    • Replies: 1
    • Views: 7,582
    10-27-2007, 08:18 PM Go to last post
  7. A question about determining significance

    Hi guys I'm trying to compare the differences in the results of a fitness test done by two different methods (and performed on a sample group of...

    Started by Sinkers‎, 05-07-2010 08:25 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 7,554
    05-12-2010, 03:10 AM Go to last post
  8. Kurtosis - where does the minus 3 come from?

    I've been trawling the web for an example for quite a while. I understand that the 3 corrects the kurtosis of the normal distribution - I'm just not...

    Started by dcx‎, 12-22-2010 06:58 PM
    • Replies: 2
    • Views: 7,552
    12-22-2010, 07:34 PM Go to last post
  9. Determining if a distribution is normal

    I'm trying to create a confidence interval, but I'm missing the fact of whether or not I'm given a normal distribution. If I'm given the mean, sample...

    Started by blossoming_fruit‎, 10-18-2009 01:32 PM
    • Replies: 3
    • Views: 7,551
    10-18-2009, 02:28 PM Go to last post
  10. Statistics Question; Lottery: Buying 2 tickets is doubling your chances

    Statement: You double your chances of winning the lottery by purchasing 2 tickets versus only purchasing 1 ticket. True or False? Provide your...

    Started by infamous‎, 12-04-2010 05:07 PM
    • Replies: 1
    • Views: 7,551
    12-04-2010, 05:47 PM Go to last post
  11. Lightbulb Inverse of the Standard Normal Cumulative Distribution Calculation

    Hi Everyone, I'm trying to verify the calculation for the Inverse Cumulative Standard Normal Distribution Function represented by the Excel...

    Started by andreja‎, 09-25-2014 02:13 AM
    • Replies: 8
    • Views: 7,551
    10-02-2014, 10:39 AM Go to last post
  12. Confidence Interval for the Median

    Hi All. I came across an article dealing with the Confidence Interval for the Median. Just for curiosity, I played with comparing the Confidence...

    Started by gianmarco‎, 05-08-2010 11:24 AM
    • Replies: 3
    • Views: 7,528
    06-17-2010, 11:27 AM Go to last post
  13. 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: 7,527
    02-08-2012, 08:55 AM Go to last post
  14. How do I find the probability of the complement of B?

    New here... How do I find the probability of the complement of B? Here is the full question: If B is the event of a child having brown hair,...

    Started by merrilythepig‎, 02-14-2012 02:40 PM
    • Replies: 2
    • Views: 7,521
    02-15-2012, 02:57 AM Go to last post
  15. Exclamation URGENT! Bartlett's Test and Mann's Test in Excel

    Hi All, I would like to take my data in an excel spreadsheet, and test it with Bartlett's Test and Mann's Test. However, when I used...

    Started by duskgal‎, 03-02-2010 12:16 AM
    • Replies: 0
    • Views: 7,520
    03-02-2010, 12:16 AM Go to last post
  16. z-score help

    Find the z-score for having area 0.07 to its right under the standard normal curve, that is, find z 0.07. I have the choices of 1.45, 1.26, 1.48,...

    Started by lilyungn‎, 06-24-2010 06:30 PM
    • Replies: 1
    • Views: 7,519
    06-25-2010, 12:53 AM Go to last post
  17. Two-sample t confidence interval

    Am I correct??!! Corn yields (bushels per acre) for experimental plots controlled to have 1 weed per meter of row and 3 weeds per meter of row: ...

    Started by mackerbuddy‎, 12-04-2005 03:58 AM
    • Replies: 2
    • Views: 7,517
    12-04-2005, 12:26 PM Go to last post
  18. Normal Distribution question for College Statistics?

    Okay my college professor is an idiot and didn't teach this at all and he is going to put this on a test, so here is my question.... Steel Rods...

    Started by Inception28‎, 10-20-2011 11:29 PM
    • Replies: 1
    • Views: 7,515
    10-21-2011, 05:47 AM Go to last post
  19. Help? testing assumptions

    A garden center wants to store left-over packets of vegetable seeds for sale the following spring, but the center is concerned that the seeds may not...

    Started by kkp39‎, 03-28-2011 09:55 PM
    • Replies: 1
    • Views: 7,512
    03-29-2011, 12:11 AM Go to last post
  20. Marginal Effect

    Hi all, I'm studying business statistics and I'm just struggling to work out this problem. I have an equation (i think the study is universal)...

    Started by CharlieHS‎, 05-18-2008 01:11 AM
    • Replies: 1
    • Views: 7,511
    05-18-2008, 05:05 PM Go to last post
  21. Nonparametric tests to support parametric tests

    hi people, i am new here so excuse my 'innocence' in statistics. I was wondering if someone could tell me if i am on the right track. In my...

    Started by Joseph‎, 06-20-2006 05:24 AM
    • Replies: 3
    • Views: 7,503
    06-21-2006, 11:00 PM Go to last post
  22. Unequal sample sizes in ANOVA/MANOVA analyses

    Hi there. I am critiquing a study and I have realised that there are unequal sample sizes in their treatment and control groups. Some analyses...

    Started by FeUtiLe‎, 09-22-2010 04:49 AM
    • Replies: 0
    • Views: 7,499
    09-22-2010, 04:49 AM Go to last post
  23. Estimation and Confidence Intervals

    I am Posting this for my wife who is in a Statistics class and has been doing very well up to this point. She has read the chapters 3 times and still...

    Started by thespider‎, 11-17-2007 01:24 PM
    • Replies: 2
    • Views: 7,496
    04-19-2010, 08:31 AM Go to last post
  24. How to determine significant differences in sample size of test & control groups

    Hello, It's been quite a few years since college statistics, so I apologize in advance if this is a very novice question for this forum, I just...

    Started by eMarketer1‎, 12-16-2009 02:30 PM
    • Replies: 1
    • Views: 7,493
    12-16-2009, 03:05 PM Go to last post
  25. Autocorrelation in the residuals

    I understand what autocorrelation is and I understand what the residuals are, but what are the implications of having autocorrelated residuals? Does...

    Started by Filco‎, 05-29-2011 10:06 PM
    • Replies: 3
    • Views: 7,486
    06-11-2011, 01:22 AM Go to last post
  26. pearson;s or spearman correlation??

    if i want to do correlation between two variables, both continues, as far as i understand if they are normly distributed , i will choose...

    Started by nurul‎, 09-16-2010 07:42 AM
    • Replies: 3
    • Views: 7,483
    09-16-2010, 08:31 AM Go to last post
  27. Percentiles

    I am struggling with this question for my homework. Values: 13 13 13 20 26 27 31 34 34 34 35 35 36 37 38 41 41 41 45 47 47 47 50 51 53 54 56 62...

    Started by jjinita‎, 09-01-2011 11:46 AM
    • Replies: 1
    • Views: 7,483
    09-01-2011, 12:24 PM Go to last post
  28. Smile Kaplan Meier curve for recurrent event data

    Hi, Can anyone help. I would like to do Kaplan Meier curves for some recurrent event data i.e. each patient has multiple events. Can I use a Kaplan...

    Started by weibull6‎, 08-16-2006 02:49 PM
    • Replies: 2
    • Views: 7,481
    11-07-2010, 07:37 AM Go to last post
  29. relationship btwn main effects, interaction, simple effects

    Hello, I took a graduate level stats course a few years ago (psychology department), but I am now realizing that there were some things I did not...

    Started by resolute‎, 07-05-2010 12:14 AM
    • Replies: 0
    • Views: 7,478
    07-05-2010, 12:14 AM Go to last post
  30. Advice on an average math student going to grad school for statistics

    Greetings, I ran into this forum when trying to look for some nice probably problems.I found out this is a really cool place to talk about stats, so...

    Started by semic‎, 12-11-2008 02:10 PM
    • Replies: 2
    • Views: 7,476
    12-11-2008, 04:40 PM Go to last post
  31. multiple linear regression: negative Y ?!

    So I have my equation and it looks weird. The intercept is a small positive value and a lot of the co-efficients have large negative values. So that...

    Started by StatsClue‎, 02-21-2012 08:08 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 7,468
    02-22-2012, 01:27 PM Go to last post
  32. gamma distribution

    Show that the sum of n independent identically distributed exponential random variables with parameter theta has a gamma distribution and give its...

    Started by teacher2be‎, 11-05-2006 12:19 PM
    • Replies: 1
    • Views: 7,466
    11-05-2006, 05:29 PM Go to last post
  33. Normal and Standard normal distributed variable

    What is the benefit of switching from a normal distributed variable to standard normally distributed variable ?

    Started by johny_5‎, 01-18-2011 08:29 AM
    • Replies: 7
    • Views: 7,463
    01-20-2011, 04:56 AM Go to last post
  34. ANOVA sums of squares proof

    How can I prove that a constant d can be added to each x_{ij} without affecting any of the ANOVA sums of squares? I know the computing forms of...

    Started by knut-o‎, 02-05-2011 02:42 PM
    • Replies: 2
    • Views: 7,462
    02-05-2011, 04:22 PM Go to last post
  35. Approximate Average

    Hi, I am very new to statistics, just started a couple of days ago and have a question: Why do we use approximate average in sample variance? Why...

    Started by bornconfused‎, 01-12-2011 10:32 AM
    • Replies: 5
    • Views: 7,452
    01-15-2011, 01:44 PM Go to last post
  36. Significance level question

    A group of researchers fails to find a significant effect that they predicted. Assuming this effect exists, what should the researchers do in order...

    Started by claudius‎, 03-18-2011 08:59 PM
    • Replies: 6
    • Views: 7,451
    03-20-2011, 02:10 PM Go to last post
  37. RPD Acceptance

    I am analyzing duplicate water quality sample data (2 samples collected in the same place at the same using the same procedures). I was told to use...

    Started by ariklee‎, 10-02-2009 10:39 AM
    • Replies: 1
    • Views: 7,448
    10-02-2009, 10:58 AM Go to last post
  38. Computing Z-Scores #2

    The following data represent the number of inches of rain in Chicago, Illinois, during the month of April for 20 randomly selected years. 2.47,...

    Started by sophieb‎, 02-26-2006 06:18 PM
    • Replies: 2
    • Views: 7,435
    02-26-2006, 08:30 PM Go to last post
  39. Who can solve this AP Stats problem?

    An agricultural field trial compares the yield of two varieties of tomato for commercial use. The researchers divide in half each of 10 small plots...

    Started by zaboda422‎, 01-15-2010 01:00 AM
    • Replies: 1
    • Views: 7,432
    01-15-2010, 01:19 PM Go to last post
  40. Exclamation For experts: About Mann Kendall

    I have a big problem with Mann Kendall test method, Attached is a table which contains the Probabilities for the Mann-Kendall Non parametric test...

    Started by drnesr‎, 10-14-2009 01:31 AM
    • Replies: 2
    • Views: 7,428
    07-24-2011, 01:36 PM Go to last post
  41. Excel 2007 t-test

    I am trying to do a t-test for two samples. The question asks me compare the mean salary of sample1 and sample2. I know how to do a t-test in excel...

    Started by newbiestats‎, 10-12-2011 08:01 PM
    • Replies: 12
    • Views: 7,425
    10-14-2011, 09:27 PM Go to last post
  42. tests for continuous independent variable and categorical dependent variable

    What tests could i use to determine the effect of continuous independent variable to categorical dependent variable? I am trying to detemine the...

    Started by carmela0715‎, 02-20-2009 07:25 AM
    • Replies: 0
    • Views: 7,421
    02-20-2009, 07:25 AM Go to last post
  43. Normal distribution, outliers, and the median

    Hi: I have some data that should have an underlying normal distribution. However, there are some extreme outliers. To estimate the mean and...

    Started by musterseed‎, 06-10-2010 08:30 PM
    • Replies: 5
    • Views: 7,415
    06-11-2010, 03:19 AM Go to last post
  44. When to use separate ANOVAs

    Greetings, I've been struggling with trying to determine when to use several different ANOVAs or when to use one large ANOVA. Many of the projects...

    Started by hwc007‎, 12-16-2008 09:00 PM
    • Replies: 7
    • Views: 7,412
    12-17-2008, 05:52 PM Go to last post
  45. test of normality on large sameples - also ks or shapiro-wilk?

    if you have a large sample size...say 1000...do you still need to run and report tests of normality? I always thought you did but in my text book it...

    Started by mimestra‎, 01-15-2011 03:08 AM
    • Replies: 4
    • Views: 7,409
    01-15-2011, 04:40 PM Go to last post
  46. Unhappy How do I Analyze Likert Scale Data

    My original goal: Prove that the JROTC program would still meet minimum enrollment requirements of 100 students if the program implemented a fitness...

    Started by howardj‎, 01-30-2011 09:41 PM
    • Replies: 1
    • Views: 7,405
    01-30-2011, 11:33 PM Go to last post
  47. I am not sure how Central Limit Theorem, and the t-distribution fit together.

    Hello, By Central Limit Theorem CLT if the sample size is large enough, the distribution of the sample means is approximately normal. This result...

    Started by Akavall‎, 03-13-2012 09:28 PM
    • Replies: 7
    • Views: 7,403
    03-14-2012, 12:36 PM Go to last post
  48. Question [SPSS] Mixed Models - How To?

    Hi everybody, I've trying to understand how linear mixed models work within SPSS and how to set up my data to run through one. Ive read the...

    Started by ben504‎, 02-27-2012 05:36 PM
    how to, mixed models, spss
    • Replies: 3
    • Views: 7,399
    03-20-2012, 11:07 AM Go to last post
  49. Simple linear regression - Do I include the constant in the equation?

    Hello, I am hoping someone can help me with a few regression questions. I am running a number of simple linear regressions....Do I want to (should...

    Started by grensot‎, 02-12-2006 01:16 PM
    • Replies: 4
    • Views: 7,397
    02-13-2006, 12:11 AM Go to last post
  50. Two-way repeated measures--post-hoc analysis?

    Hello, I have run a repeated measures two-way ANOVA using SAS. The repeated measure is time and it shows that it is significant in an interaction...

    Started by Sheesh19‎, 10-26-2011 04:06 PM
    anova, repeated measures, two-way
    • Replies: 4
    • Views: 7,395
    10-28-2011, 04:02 AM Go to last post
  51. t-score sample sizes

    Hopefully someone can help me with this.... I am projecting forward two fish stock populations for a 10 year period with different levels of...

    Started by neopaddy‎, 07-02-2007 10:12 AM
    • Replies: 4
    • Views: 7,394
    07-06-2007, 12:00 PM Go to last post
  52. What is the unique advantage of Wald test and score test?

    Since LRT is the most pwerful, why do we need the other two? :confused: Thanks.

    Started by hehe1223‎, 11-16-2010 10:33 PM
    • Replies: 3
    • Views: 7,392
    11-17-2010, 07:06 PM Go to last post
  53. Thumbs down Z-Score?

    Hi, I'm having a problem figurung out what this question is asking: "Find the number Z such that the proportion of observations that are less...

    Started by RedFred2089‎, 09-13-2006 03:53 PM
    • Replies: 2
    • Views: 7,388
    09-13-2006, 07:59 PM Go to last post
  54. Calculate Rho from Durbin-Watson Statistic

    Have a test in an hour so probably wont be answered but on the practice test there is a question: "If the DUrbin-Watson statistic equals 1.6, then...

    Started by The-ill-man‎, 12-04-2007 12:22 PM
    • Replies: 2
    • Views: 7,381
    12-04-2007, 12:47 PM Go to last post
  55. Consistent Estimators and Consistency in Mean Square

    Hello, I have an estimator \hat\theta = f(X) and I know that f(X) has two possible values under this probability function: P(f(X) = \theta /...

    Started by MrAnon9‎, 11-30-2011 08:24 PM
    2 Pages
    1 2
    • Replies: 26
    • Views: 7,377
    12-02-2011, 12:12 PM Go to last post
  56. Question How do I identify the test statistic?

    Please help! I am stumped and I have no clue how to work this problem. Any help would be greatly appreciated! Thanks Listed below are ages of...

    Started by cindave‎, 07-29-2015 01:03 PM
    • Replies: 3
    • Views: 7,370
    07-29-2015, 01:56 PM Go to last post
  57. Nonparametric post hocs

    Hi all, I am analyzing behavioral data from experiments I have conducted. I have used the Kruskal-Wallis nonparametric ANOVA to identify if...

    Started by umtox‎, 02-22-2006 01:16 PM
    • Replies: 2
    • Views: 7,364
    02-23-2006, 08:08 AM Go to last post
  58. Looking Up / Interpreting p Value for z values

    Hi all, Another question. May be a silly question but my brain often gets tangled when going from book to application. After hours of...

    Started by Fred‎, 04-09-2009 10:52 AM
    • Replies: 7
    • Views: 7,359
    04-14-2009, 05:47 AM Go to last post
  59. find underlying distribution - how ?

    hi all, a naive question, i have a dataset and i need to find out whihc one of the three (normal, poisson, log normal) generated it. i must use...

    Started by sed‎, 03-20-2010 02:24 PM
    • Replies: 2
    • Views: 7,358
    03-21-2010, 02:27 PM Go to last post
  60. Central tendency and percentile

    Can any of the following be true with a data set consisting of 1,000 values that are all different? If so, can you please explain why:eek: The...

    Started by jenclark242‎, 09-23-2010 08:49 AM
    • Replies: 8
    • Views: 7,344
    09-24-2010, 08:04 AM Go to last post

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