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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: 197,244
    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: 67,011
    09-30-2005, 09:44 AM Go to last post
  1. 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: 7,444
    12-04-2007, 12:47 PM Go to last post
  2. Using Standard Deviation to measure performance

    I'm examining 21 years of data for the top performers of a company. Here are the median numbers for the top 24 (my baseline) performers: MEDIAN...

    Started by cpaavola‎, 02-12-2010 12:18 AM
    • Replies: 2
    • Views: 7,433
    02-12-2010, 10:49 AM Go to last post
  3. 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: 7,426
    09-24-2010, 08:04 AM Go to last post
  4. Question about Chi-Square test and Bar graph

    Hi, I have a quick question. Is a chi-square test appropriate with measurement or categorial variable? And is a bar graph useful to...

    Started by oooop2‎, 04-02-2011 03:06 PM
    • Replies: 2
    • Views: 7,423
    04-02-2011, 11:10 PM Go to last post
  5. what is p value in correlation test when n increase?

    hi everyone, since statistics and maths in general are not my forte, i'm having trouble. if anyone could help, i would be eternally grateful. the...

    Started by cass‎, 04-09-2011 10:53 AM
    correlation formula n t
    • Replies: 4
    • Views: 7,417
    04-11-2011, 08:02 AM Go to last post
  6. [SOLVED] Distribution of the Sample Range

    Hello, I got an article that was written by an unknown author, which I downloded from the Internet. It looks like one part of a book. I have...

    Started by DHB10‎, 01-30-2012 10:34 AM
    3 Pages
    1 2 3
    • Replies: 32
    • Views: 7,417
    02-01-2012, 12:52 PM Go to last post
  7. Binomial Probabilities

    Please help me with these statistics problems! I'm really new to this online program for school and it's really hard without a teacher or peers to...

    Started by Soccer23‎, 04-23-2012 01:10 PM
    binomials, probability help, statistics, statistics homework
    • Replies: 0
    • Views: 7,404
    04-23-2012, 01:10 PM Go to last post
  8. Follow up tests in 2x4 ANOVA (mixed)

    I have 2 groups and 4 conditions. There was a significant group*condition interaction. To follow up this interaction, as there are only 2 groups,...

    Started by arikel‎, 04-03-2008 05:58 AM
    • Replies: 0
    • Views: 7,402
    04-03-2008, 05:58 AM Go to last post
  9. Is it valid/preferable to use non-parametric tests for parametric data?

    Hello, I recently received reviews for a manuscript I wrote that used a mix of parametric and non-parametric statistics, as the tests I used were...

    Started by GiganD‎, 11-09-2008 04:51 PM
    • Replies: 2
    • Views: 7,401
    11-09-2008, 05:40 PM Go to last post
  10. Derivation of chi-squared test for independence in 2 by k table

    Hi everyone, I am attempting to understand the theory behind the popular chi-square test for independence for 2 x k tables. It has been...

    Started by theta‎, 10-23-2011 09:12 AM
    • Replies: 3
    • Views: 7,401
    10-23-2011, 03:51 PM Go to last post
  11. Re:F-test for effect of two independent variable

    Anyone know how do we use a F-test to see if the impact of two independent variable are the same? e.g the impact of gender and the impact of race...

    Started by cmli4‎, 09-14-2010 05:41 AM
    • Replies: 11
    • Views: 7,398
    09-14-2010, 10:25 PM Go to last post
  12. 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: 7,397
    04-14-2009, 05:47 AM Go to last post
  13. Would this Likert scale count as interval?

    Hi everyone. A simple question please. I have been reading that there is a huge debate on whether nominal Likert scales (agree, disagree) can be used...

    Started by graphicsgriffin‎, 06-26-2011 12:33 PM
    2 Pages
    1 2
    • Replies: 20
    • Views: 7,396
    07-03-2011, 11:17 PM Go to last post
  14. How do I choose the correct or appropriate statistical test?

    How do I choose appropriate statistical tests for various exam questions? Specifically I am having trouble with deciding on the correct tests to use...

    Started by cand26‎, 06-08-2009 06:08 PM
    • Replies: 3
    • Views: 7,394
    06-09-2009, 04:35 AM Go to last post
  15. Calculating p-value for t value less than 1

    I ended up with a t value of -0.47. So now I look at the t value chart, and I see all positive numbers, and all above 1. How can I get the p-value...

    Started by free_radicals‎, 06-18-2012 09:31 PM
    • Replies: 4
    • Views: 7,391
    06-18-2012, 11:20 PM Go to last post
  16. Difference between normal Q-Q plot versus "Detrended" Q-Q plots?

    Hi and thanks for reading this post, I wanted to know if someone could explain the difference between these two types of plots? Thanks again,...

    Started by statn00b‎, 11-18-2011 08:57 PM
    • Replies: 0
    • Views: 7,389
    11-18-2011, 08:57 PM Go to last post
  17. Graphing for precision/accuracy?

    Hi everyone-- Hoping that this is the right place to ask this question. Was wondering if anyone can refer me to a resource to create a graph...

    Started by Kat2002‎, 10-17-2010 05:39 PM
    • Replies: 3
    • Views: 7,388
    10-17-2010, 07:44 PM Go to last post
  18. "independent of" vs "mutually exclusive"

    Hi, I am a stats newbie. Sorry about asking this trivial question. Say I have a 2 x2 contingency table. The categories defining rows and...

    Started by kevinoisac‎, 07-27-2011 10:36 AM
    • Replies: 4
    • Views: 7,386
    07-27-2011, 04:03 PM Go to last post
  19. restriction of range

    Hi I am somewhat confused about something...I have read that ideally one wants to select a sample that is homogeneous. But doesn't this create...

    Started by psychologygirl‎, 06-01-2009 02:11 PM
    • Replies: 2
    • Views: 7,384
    06-01-2009, 04:03 PM Go to last post
  20. standard deviation of replicates

    Hi I have a samples set where each sample have been measured twice, that is, I have two technical replicates of each sample. Would it be...

    Started by madlabsrobot‎, 05-08-2010 04:05 AM
    • Replies: 1
    • Views: 7,369
    05-08-2010, 10:09 AM Go to last post
  21. Exclamation SPSS Mann Kendall Test + Forecasting

    I hope there is someone out there whom can advise.... Thanks.

    Started by nrowney‎, 03-15-2011 12:51 PM
    mann kendal forecasting
    • Replies: 0
    • Views: 7,366
    03-15-2011, 12:51 PM Go to last post
  22. Best software for multivariate analysis

    Hello, I have an ntuple that I would like to do simple multivariate analysis on and just see the correlations among variables. I used to use ROOT...

    Started by tigerstripedcat‎, 01-17-2010 04:44 AM
    • Replies: 3
    • Views: 7,365
    01-18-2010, 12:42 AM Go to last post
  23. Homogeneity - Box's M and MANOVA

    Hi, I have (yet another) stats question! How do I go about testing for Homogeneity of variance-covariance when I plan to do a MANOVA? I've read...

    Started by damnsaiyan‎, 07-27-2008 02:07 AM
    • Replies: 1
    • Views: 7,364
    07-27-2008, 09:42 AM Go to last post
  24. Normal Distribution Curve

    I just want to make sure I am getting this right. 0.0<z<2.85 .5000-.4978 =.0022 so I would shade in to the right of the curve. -1.38<z<0...

    Started by summertigger‎, 01-22-2006 02:08 PM
    • Replies: 7
    • Views: 7,352
    05-10-2006, 11:24 AM Go to last post
  25. How to check association between an interval variable & nominal variable?

    There is a collection of data of 2000 patients. I want to know the age of onset of Diabetes (an interval variable) has any relationship to the...

    Started by buddhika‎, 03-15-2012 04:35 PM
    interval data, nominal data, significance test
    • Replies: 9
    • Views: 7,352
    12-06-2012, 07:30 PM Go to last post
  26. Need Help w/ correlation test assume regression inferences are met. Work answer out

    A grass seed company conducts a study to determine the relationship between the density of seeds planted (in pounds per 500 sq ft) and the quality of...

    Started by greatful4stathelp‎, 09-07-2005 01:09 PM
    • Replies: 1
    • Views: 7,348
    09-08-2005, 11:09 AM Go to last post
  27. Arrow level of significance test with no standard deviation

    Hi, one question...been doing one and two tailed tests of level of significance but have a problem without a standard deviation...How do I proceed...

    Started by tysull‎, 04-14-2006 01:51 PM
    • Replies: 1
    • Views: 7,337
    04-14-2006, 02:10 PM Go to last post
  28. effect size and power

    If i found no statistical differences between groups (t-test) it still make any sense to calculate the effect size and power? If so what is a...

    Started by bluecat‎, 06-17-2009 10:14 AM
    • Replies: 1
    • Views: 7,329
    06-17-2009, 09:20 PM Go to last post
  29. ANOVA --- one factor vs. two factor?

    Had a quick question when do we run a single factor run of ANOVA vs TWO FACTOR? The following question is what i'm working on, should i use...

    Started by kripa.sharma‎, 12-09-2008 09:36 PM
    • Replies: 0
    • Views: 7,323
    12-09-2008, 09:36 PM Go to last post
  30. Statistics on fold change

    Hello everyone, This may be a basic question but I am facing a problem I do not know how to solve... Let me explain the situation : I am...

    Started by FredG‎, 12-18-2008 12:10 PM
    • Replies: 0
    • Views: 7,322
    12-18-2008, 12:10 PM Go to last post
  31. Calculating Seasonal Indices

    Hello, I am interested in calculating seasonal indices of time series data with the following methods: 1. Method of simple averages 2. Ratio...

    Started by zarasandreas‎, 03-10-2009 03:10 AM
    • Replies: 1
    • Views: 7,321
    03-10-2009, 09:41 PM Go to last post
  32. Unhappy Non-probability sampling stuff

    Hi there, Sorry probably asking a very basic question but just want to make sure... Am I right in saying that if I have surveyed people using a...

    Started by amyj‎, 09-09-2005 02:11 PM
    • Replies: 3
    • Views: 7,314
    09-09-2005, 03:23 PM Go to last post
  33. Logistic Regression Output

    Hi, I have done a logistic regression but am having trouble interpreting the output. I looked at the effect of three vegetation types (H M L) and...

    Started by VictoriaS‎, 09-05-2010 01:02 AM
    • Replies: 5
    • Views: 7,313
    09-06-2010, 02:57 PM Go to last post
  34. "Combined" Means and Variances?

    Hi everyone. This is my first stat assignment of the semester and I am already confused. I'm not sure what my prof is asking. I will reproduce...

    Started by stud40111‎, 09-11-2010 12:13 PM
    • Replies: 8
    • Views: 7,313
    09-13-2010, 08:07 PM Go to last post
  35. How to interpret Tukey's b

    I was wondering if anyone could assist me on how to interpret my Tukey's b results. I need to indicate which clusters differ significantly from...

    Started by Pieterg‎, 10-12-2006 11:10 AM
    • Replies: 0
    • Views: 7,311
    10-12-2006, 11:10 AM Go to last post
  36. Computing Power

    I know that power is one minus beta...but how do you calculate beta?

    Started by amanning‎, 10-12-2005 09:48 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 7,309
    10-12-2005, 11:25 PM Go to last post
  37. Permutation/Combination

    I'm really stuck on these problems. I would greatly appreciate it if someone can help me. A computer hacker is trying to break into a computer...

    Started by Luis Felipe‎, 07-08-2010 01:57 PM
    • Replies: 2
    • Views: 7,309
    07-08-2010, 08:02 PM Go to last post
  38. Residual error estimate

    Consider a regression model: E(Y|x) = \alpha + \beta x + \epsilon where \epsilon ~ N(0, {\sigma}^2) . Find a point estimate of ...

    Started by madara123‎, 09-17-2010 08:25 PM
    • Replies: 7
    • Views: 7,308
    09-17-2010, 10:25 PM Go to last post
  39. how is data affected if the same constant is added..?

    I had to obtain results for specific data, and now I have a question that I don't understand. How is the mean, median and standard deviation...

    Started by bladeam‎, 02-25-2008 11:47 AM
    • Replies: 1
    • Views: 7,303
    02-25-2008, 01:04 PM Go to last post
  40. Smile simple slopes in 3-way moderated regression

    Hi I am trying to work out how to do simple slopes test for a three way moderated regression. Here is how my data set looks: IV 1: dichotomous...

    Started by Donna‎, 11-12-2008 12:25 PM
    • Replies: 4
    • Views: 7,300
    11-14-2008, 11:39 AM Go to last post
  41. Normally Distributed Data Set

    Hi there, sorry I am new here, but can any one point in the direction of data sets which passed test for normal distribution diagnostic and can...

    Started by dafreedomfita‎, 10-27-2011 01:19 AM
    • Replies: 1
    • Views: 7,299
    10-27-2011, 06:01 PM Go to last post
  42. [ AP STATISTICS ] Quiz 6.2B - Standard Deviation/ Mean Problem.

    Solved. Mods may delete this now :)

    Started by L1LK1LLERZ‎, 03-17-2014 07:09 PM
    • Replies: 2
    • Views: 7,299
    03-17-2014, 08:59 PM Go to last post
  43. interpreting ACF and PACF

    I have a time series for which I want to check stationarity. But I don't know how to interpret the ACF and PACF function graphs and their respective...

    Started by khhyatii‎, 08-30-2009 06:19 PM
    • Replies: 0
    • Views: 7,297
    08-30-2009, 06:19 PM Go to last post
  44. Interrater Reliability estimate (pearson's r)

    Hi All, I am in need of some help. I am trying to determine the correlation of 5 continuous variables to determine the interrater reliability...

    Started by gradstudent4life‎, 07-16-2014 06:44 PM
    • Replies: 1
    • Views: 7,293
    07-16-2014, 08:11 PM Go to last post
  45. How do I compare two methods?

    I have two methods of measuring a variable. I have different subjects that each had multiple readings taken, using each method. I now want to...

    Started by ontariostudent‎, 06-14-2009 09:25 PM
    • Replies: 3
    • Views: 7,289
    06-15-2009, 12:14 AM Go to last post
  46. Question Case Study: Professional Sales. Lost and Need Help

    Thank you in advance for your help. I'm just lost on this one and the book really isn't helping. Data is attached with excel file for ease of use....

    Started by seantravis‎, 04-22-2009 09:21 AM
    • Replies: 0
    • Views: 7,284
    04-22-2009, 09:21 AM Go to last post
  47. When do I use which stats test?

    Hi all, I have a homework question as follows: A technician in a clinical lab is released to do routine glucose analyses when the data obtained by...

    Started by Chaste‎, 11-14-2010 02:47 AM
    • Replies: 4
    • Views: 7,280
    11-15-2010, 07:49 AM Go to last post
  48. Interaction effects, distributions not normal- is ANOVA justified??

    Hi! I have a 2*4*6 factorial design. the sample distributions in most cases are NOT normal (tested with Kolmogorov-Smirnof test). It is...

    Started by knedlica‎, 11-02-2012 07:20 AM
    3 Pages
    1 2 3
    • Replies: 35
    • Views: 7,279
    11-11-2012, 03:53 AM Go to last post
  49. Calculating True Score Given Reliability and Total Variance

    I've got a question about estimating a true score variance. I'm given the following info: a test contains 20 items, an individual's score was 80,...

    Started by tk6‎, 10-28-2012 12:25 AM
    • Replies: 0
    • Views: 7,276
    10-28-2012, 12:25 AM Go to last post
  50. Expected Value and Standard Dev.

    I need some guidance with the following...please help!! Scenario: You pay $10 and roll a die. If you get a 6, you win $50. If not, you get to...

    Started by HuskerJay‎, 10-16-2006 06:15 PM
    • Replies: 0
    • Views: 7,275
    10-16-2006, 06:15 PM Go to last post
  51. Exclamation unequal sample sizes

    I'm hoping for help on dealing with unequal sample sizes. Any assistance is greatly appreciated. I'm currently working with data from...

    Started by skushner‎, 06-22-2009 02:59 PM
    • Replies: 3
    • Views: 7,270
    06-23-2009, 07:52 PM Go to last post
  52. Perhaps statistics is not for me.

    Please someone help! I recently answered a couple questions on a statistic test and I thought that I had answered them correctly, however the answers...

    Started by SunDog‎, 07-18-2008 03:43 PM
    • Replies: 2
    • Views: 7,269
    07-18-2008, 06:45 PM Go to last post
  53. Paper Helicopter Experiment Doubt

    I have to do a Statistics homework related to the “Paper Helicopter Experiment”. Well, one of the most problematic questions is the last one: ...

    Started by Badjoras‎, 04-03-2013 06:11 PM
    2 Pages
    1 2
    • Replies: 29
    • Views: 7,264
    04-19-2013, 07:17 PM Go to last post
  54. Standard Deviation or Average Rate of Return

    I had this question on a quiz and I felt there were two correct answers, tell me what you guys think. This table shows returns on two different...

    Started by cjb‎, 09-14-2009 11:00 AM
    • Replies: 2
    • Views: 7,262
    09-15-2009, 05:24 PM Go to last post
  55. Statistics on zero values?

    Sounds a bit silly, but can i do any "control vs test" stats when the control data are all zero? I am adding a chemical to cells, and measuring...

    Started by scotch‎, 12-20-2010 07:59 AM
    • Replies: 2
    • Views: 7,254
    12-20-2010, 05:33 PM Go to last post
  56. Significantly the same?

    How do you test if two groups are significantly the same? When you do a significance test of two groups and p<.05, we can be confident that they...

    Started by nickleby‎, 05-26-2009 09:36 AM
    • Replies: 7
    • Views: 7,253
    05-28-2009, 08:26 PM Go to last post
  57. Can there really be no significant difference?

    Hi, I have a study with 73 participants (32 in group A and 41 in group B). In response to a yes/no item 41% of those in group A and 22% in group B...

    Started by The Duke‎, 06-21-2009 07:09 AM
    • Replies: 6
    • Views: 7,252
    06-22-2009, 05:08 PM Go to last post
  58. CDF vs. PDF

    Hey everyone, I was looking for example "cdf" problems to do to get ready for a test and I came up with one that I didn't understand.... The...

    Started by HikariT‎, 06-02-2008 04:32 PM
    • Replies: 7
    • Views: 7,246
    06-03-2008, 04:31 AM Go to last post
  59. Sos: Get expected value & variance of dependent variable, pls. See the problem

    Suppose that a firm's total costs are given by C = 2 + 15Q, where Q represents the firm's output. The expected values and variance of output; E(Q)...

    Started by dEconomist‎, 02-24-2011 12:00 PM
    • Replies: 6
    • Views: 7,246
    02-25-2011, 08:48 AM Go to last post
  60. Unweighted and Weighted Data (Chi Square)

    Here's my situation: I have a dataset with unweighted data taken from a small, annual survey. I also have a large dataset with weighted and...

    Started by ambermrichardson‎, 01-19-2007 08:38 AM
    • Replies: 0
    • Views: 7,239
    01-19-2007, 08:38 AM Go to last post

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