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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: 197,128
    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: 66,938
    09-30-2005, 09:44 AM Go to last post
  1. Nonparametric 3 factor ANOVA

    I am trying to find a nonparametric equivalent for 3 within subject factors ANOVA test. I checked Friedman test, but all the examples that I found...

    Started by aligoles‎, 08-14-2010 02:46 PM
    • Replies: 3
    • Views: 10,310
    05-07-2013, 10:14 AM Go to last post
  2. R question/Command to calculate Confidence Interval of a Mean?

    Does anyone know what command I should use in R for a confidence interval test on a one-sample mean? I know the command to estimate the...

    Started by parsec2011‎, 01-04-2012 07:53 AM
    • Replies: 2
    • Views: 10,308
    01-04-2012, 08:58 AM Go to last post
  3. sample proportion of a binomial distribution

    All, I am trying to figure out the probability (using a binomial distribution) that a sample proportion (4/100) will be greater than or equal to...

    Started by jbw9‎, 01-29-2010 11:50 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 10,292
    01-31-2010, 04:43 PM Go to last post
  4. Effect Size for mixed model (SPSS)

    OK ... linear mixed models for SPSS do not provide an effect size. There is no sum of squares, SD etc. for the usual suspects. I've read some stuff...

    Started by Philyuko‎, 07-22-2009 06:18 AM
    • Replies: 1
    • Views: 10,273
    06-22-2010, 05:21 AM Go to last post
  5. Covariance of Multinomial Trials

    The problem is to find the covariance of N_i and N_j where N_1, N_2,...,N_r are multinomial random variables. It is known that the marginal...

    Started by jstallin‎, 06-25-2009 04:49 PM
    • Replies: 1
    • Views: 10,264
    01-13-2013, 02:20 AM Go to last post
  6. How to prove the formula for leverage/diagonal of H matrix?

    hii =1/n+(Xi-Xbar )^2/Sxx

    Started by hehe1223‎, 12-11-2010 09:36 PM
    • Replies: 1
    • Views: 10,261
    12-12-2010, 02:04 AM Go to last post
  7. Regression Analysis Margin of Error

    I have this question: Data were collected from 10 male patients in hospital after they had suffered a heart attack. The following table shows the...

    Started by duvel‎, 05-27-2010 10:11 PM
    • Replies: 1
    • Views: 10,259
    06-02-2010, 02:22 AM Go to last post
  8. I Need Help

    All, I am struggling with Statistics in all areas. I'm great with numbers, however, I'm lost with this. Can someone help? Here are the following...

    Started by 1NAMILL‎, 11-01-2005 02:48 PM
    • Replies: 6
    • Views: 10,257
    11-03-2005, 12:41 PM Go to last post
  9. Unhappy home work help/my answers are not matching the options

    The grade point averages for 10 randomly selected high school students are listed below.Assume the grade point average are normally distributed. 2.0...

    Started by stat help‎, 04-12-2008 11:50 AM
    • Replies: 2
    • Views: 10,244
    04-13-2008, 07:50 AM Go to last post
  10. Single item indicators in SEM (AMOS)

    Hello Im using AMOS for structural equation modeling. My current model has 6 latent constructs that are each measured by 2-4 observable...

    Started by Sheffield‎, 12-15-2009 12:55 PM
    • Replies: 2
    • Views: 10,215
    12-17-2009, 05:39 AM Go to last post
  11. Partial eta squared

    For my thesis I need to refer to a document which contains the standards as to which values of partial eta squared are considered low, medium or...

    Started by Pluzan‎, 09-03-2013 05:21 AM
    • Replies: 5
    • Views: 10,213
    09-04-2013, 09:34 AM Go to last post
  12. What test to use?

    Hi there I have data in a 2x3 table, and want to test for significance. Over half of the cells in the table have values less than 5. If it were...

    Started by TraumaAuditMonkey‎, 01-27-2010 09:18 AM
    • Replies: 3
    • Views: 10,207
    01-28-2010, 02:26 AM Go to last post
  13. average of two means from the same data?

    I've been given two means from the same data set (split into people who said yes and no) from this i have to find the mean of the total of the data....

    Started by twitchy‎, 09-30-2006 02:05 AM
    • Replies: 2
    • Views: 10,166
    10-01-2006, 08:19 AM Go to last post
  14. OLS Intercept Standard Error

    How do you calculate the standard error of the intercept in OLS regression analysis? The excel regression analysis output has the intercept's...

    Started by bc9hz‎, 11-14-2009 05:41 PM
    • Replies: 1
    • Views: 10,161
    11-14-2009, 06:07 PM Go to last post
  15. When to report the Levene test?

    Hi all, I'm stuck on two questions, basically don't know whether I should report the Levene tests or not. Both designs are between subjects...

    Started by HannahBanana‎, 03-18-2009 04:17 AM
    • Replies: 1
    • Views: 10,152
    03-18-2009, 04:20 PM Go to last post
  16. Help on Permutations and Combinations

    Hi all, I've been working on two problems that are really stumping me, and would really appreciate some help. Here are the problems and how I...

    Started by stastastatistics‎, 07-07-2010 03:38 AM
    • Replies: 2
    • Views: 10,148
    07-10-2012, 01:20 PM Go to last post
  17. Median with "tied values"

    Hi all, My first stats course was almost 20 years ago. I'm starting again and have come across a calculation for median that I've never seen...

    Started by Cheeseboy‎, 10-10-2011 09:13 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 10,147
    11-20-2011, 02:07 PM Go to last post
  18. Observed and expected

    It may be a very silly question, but I have trouble conceptualizing these two terms. I had this contingency table with 2 rows and colums. Is...

    Started by Susanbwh‎, 02-11-2006 12:53 PM
    • Replies: 3
    • Views: 10,143
    02-12-2006, 05:24 PM Go to last post
  19. Howa To categorize a continious variable

    Hi everybody, I am a new member in your forum, hope everyone is going well, and hope that you can help me for this simple question : How...

    Started by kmel56‎, 11-27-2010 10:34 AM
    • Replies: 4
    • Views: 10,143
    11-27-2010, 11:05 AM Go to last post
  20. Mann Whitney test interpretation

    Hello I conducted Mann Whitney test to see if there is a significant difference in the duration spent by two groups (x,y) in a country ,and found...

    Started by visitor‎, 10-12-2010 07:47 PM
    • Replies: 1
    • Views: 10,142
    10-13-2010, 01:06 AM Go to last post
  21. Testing joint significance

    Hi I have a set of data with observations on two scores: a measure of worker pay, and a measure of IQ. I am representing group averages for...

    Started by oscarrobson‎, 10-26-2010 10:29 AM
    • Replies: 0
    • Views: 10,142
    10-26-2010, 10:29 AM Go to last post
  22. Analysis of simple yes/no data?

    Hello. I am dealing with choice data (dependent variables are 'correct' or 'incorrect' choice), and am unsure of the analysis. I have 2 experimental...

    Started by Jimmy55‎, 02-23-2009 07:35 AM
    • Replies: 1
    • Views: 10,136
    02-23-2009, 04:44 PM Go to last post
  23. Meaning of a Statistically Significant Intercept

    Greetings: I have been attempting to define the meaning of a statistically significant intercept in multiple regression. I have searched the Web...

    Started by Tschwartz1007‎, 05-11-2013 04:20 PM
    • Replies: 7
    • Views: 10,124
    05-13-2013, 05:58 PM Go to last post
  24. Forecasting MA(1) process

    Suppose x_{t} = w_{t} + \theta w_{t-1} where w_t is white noise with variance \sigma_{w}^2 Derive the minimum mean square error one-step forecast...

    Started by lord12‎, 02-23-2013 10:49 PM
    • Replies: 3
    • Views: 10,120
    02-24-2013, 12:29 PM Go to last post
  25. Need Help..not sure which formula to use.

    Hey everyone! I have a homework problem that I am stuck on. Here it goes: A researcher at a major hospital wishes to estimate the proportion of...

    Started by istew9‎, 07-22-2010 10:36 PM
    • Replies: 4
    • Views: 10,119
    07-23-2010, 03:39 PM Go to last post
  26. moderator? mediator? confounder?

    Hello, Are moderator variable and mediator variable both types of confounding variables? What how are moderators different from mediators?

    Started by bunguman‎, 09-19-2009 06:54 PM
    • Replies: 1
    • Views: 10,082
    09-20-2009, 03:38 AM Go to last post
  27. sample standard deviation from population standard deviation?

    Hello :) My question is: The number of hours spent watching TV by students in the week before finals has a normal distribution with unknown mean...

    Started by SS501‎, 10-15-2010 11:44 PM
    • Replies: 1
    • Views: 10,076
    10-16-2010, 09:04 AM Go to last post
  28. Business Stats Project - where to find data set

    Hi, I have an MBA group project which requires us to: 1. Identify a business problem 2. Design an experiment using ANOVAs (min of 2...

    Started by bp_‎, 08-17-2008 11:10 AM
    • Replies: 3
    • Views: 10,065
    08-18-2008, 02:24 AM Go to last post
  29. Nested ANOVA with unequal sample sizes

    Hello, I am writing because I am unsure as to whether I can perform a nested ANOVA with unequal sample sizes. I have two main groups: subject type...

    Started by cdeck‎, 01-04-2010 06:55 PM
    • Replies: 5
    • Views: 10,045
    01-05-2010, 06:09 PM Go to last post
  30. Negative Lower Limits

    Hello. I am new to the forum, but am taking Business Statistics II and will probably become a frequent visitor here. My question is, in figuring...

    Started by trippstrat‎, 08-13-2009 08:47 PM
    • Replies: 4
    • Views: 10,037
    06-01-2012, 03:10 PM Go to last post
  31. confidence interval and sampling size accuracy confusion.

    Hi, I have to find the best interpretation of a confidence interval and I am kind of stuck, i always explain my confidence interval something like,...

    Started by SadieKhan‎, 11-15-2010 07:48 AM
    • Replies: 5
    • Views: 10,034
    11-15-2010, 12:49 PM Go to last post
  32. Red face Survey Question - Multiple Options & how to calculate percentages

    I need to know what the most staistically sound calculation of percentages is for the following: I have a survey question that has multiple...

    Started by firefly_lv‎, 05-16-2008 09:23 AM
    • Replies: 0
    • Views: 10,030
    05-16-2008, 09:23 AM Go to last post
  33. true mean

    Hi can you help me with another question please. i have been given the critical dimension of a random sample of 16 auto crankshafts measured in mm...

    Started by roby‎, 01-20-2006 03:16 PM
    • Replies: 1
    • Views: 10,025
    01-20-2006, 04:03 PM Go to last post
  34. I cant figure out the number of classes

    from these numbers I have to make a six column f/d table 30 26 16 23 22 10 8 15 16 23 29 30 22 15 24 9 5 4 15 24 21 24 16 14 21 13 6 2 23 29 24...

    Started by jj71787‎, 10-09-2008 07:22 PM
    • Replies: 9
    • Views: 10,012
    10-12-2008, 02:19 PM Go to last post
  35. Logistic regression versus chi square test for RCT data

    Hi My understanding of statistics is basic and mostly on an applied level, but now I have come into a discussion with my project leader and I'm...

    Started by pirflax‎, 03-14-2013 03:46 PM
    • Replies: 10
    • Views: 10,011
    03-17-2013, 03:46 AM Go to last post
  36. 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: 10,005
    09-25-2009, 02:03 PM Go to last post
  37. Probability of a Mailing Machine

    I need some real serious help. This is the problem I need to finish. A technician services mailing machines at companies in the Phoenix area....

    Started by NikNice‎, 10-09-2005 04:45 PM
    • Replies: 4
    • Views: 9,990
    10-09-2005, 05:53 PM Go to last post
  38. hi~i come again~~this is a bout

    Case #1: Nutrition Education Programs Nutrition education programs, which teach their clients how to lose weight or reduce cholesterol levels...

    Started by daniel7lu‎, 11-25-2009 03:32 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 9,980
    12-02-2009, 08:29 PM Go to last post
  39. scatterplot apa style?

    I dont have my APA manual with me (stuck in qld floods) and have an assignment due in tomorrow. I am wanting to put my scatterplot as a figure in my...

    Started by mimestra‎, 01-12-2011 07:03 PM
    • Replies: 0
    • Views: 9,978
    01-12-2011, 07:03 PM Go to last post
  40. normal vs nonnormal distribution??

    Hi, we just learned about the nonnormal distribution in class today, but I'm afraid that I'm still a little confused. I'm stuck on this problem: ...

    Started by fiddlestix327‎, 07-23-2008 07:26 PM
    • Replies: 1
    • Views: 9,977
    07-23-2008, 08:13 PM Go to last post
  41. parametric or non parametric

    Hi, I was wondering if you could help me with my problem. I have obtained some data from a lab experiment i have conducted, but I do not know if my...

    Started by punkydory‎, 03-25-2009 05:42 PM
    • Replies: 3
    • Views: 9,970
    03-26-2009, 04:54 PM Go to last post
  42. Chebyshev’s theorem

    Standardize the data 10, 21, 23, 27, 27, 29, 30, 32, 33, 40, then identify the percentage of observations that fall within k = 2.0 standard...

    Started by xeniup‎, 02-26-2014 10:04 PM
    • Replies: 5
    • Views: 9,959
    02-27-2014, 04:27 AM Go to last post
  43. Angry What statistical analyses to use? How age influences bone density

    So I have a variable, lets say Bone density in older adults. I have200+ participants ranging from 50-80 years and with its respective bone...

    Started by rperea‎, 03-17-2014 05:20 PM
    • Replies: 7
    • Views: 9,955
    03-18-2014, 03:04 AM Go to last post
  44. Difficulty distinguishing between discrete and continuous data

    I have been trying for ages to solve this question, been looking up on the internet and various forums all of which have yielded conflicting results...

    Started by LilBunny‎, 08-11-2010 05:43 AM
    • Replies: 1
    • Views: 9,950
    08-12-2010, 12:00 AM Go to last post
  45. re: zero in confidence interval but p-value < alpha

    Hello. I would be very much appreciative of any help in this issue. The problem involves the difference of means of 2 dependent samples. The null...

    Started by la_pork‎, 11-14-2008 03:16 PM
    • Replies: 7
    • Views: 9,948
    11-14-2008, 07:27 PM Go to last post
  46. Nominal - Interval and Ordinal - Interval analyses

    I'm trying to help out a friend who is finishing up a report on the results of a survey she conducted on domestic violence in a minority population,...

    Started by heiklei‎, 10-26-2009 10:59 AM
    • Replies: 3
    • Views: 9,940
    10-27-2009, 12:35 PM Go to last post
  47. Symbol for Regression Test

    Hi, I am looking for the symbol used for linear regression analysis tests. I know Chi Square is 'X squared', and correlation coefficient is 'r',...

    Started by August 15‎, 01-13-2011 07:46 PM
    • Replies: 2
    • Views: 9,931
    01-13-2011, 08:32 PM Go to last post
  48. Formula to calculate sample size in Pearson's correlation

    Dear Teachers and friends, hi. i am from Malaysia, UKM student, occupational therapy student. i now writing my final year thesis. i now looking...

    Started by pingyeap‎, 02-04-2009 06:54 AM
    • Replies: 0
    • Views: 9,922
    02-04-2009, 06:54 AM Go to last post
  49. Comparison of two geometric means

    Dear All, Is there any statistical test to compare two geometric means of two different groups?? Or any other alternative method to compare?? ...

    Started by Bala‎, 06-01-2009 02:55 AM
    • Replies: 1
    • Views: 9,914
    06-01-2009, 03:10 AM Go to last post
  50. F-test with 6 dummy variables. What is the formula?

    Hi everybody, I am working on an assignment, and I am now stuck at a question that I can not understand clearly: "onduct an F-test for the...

    Started by basouille‎, 03-12-2011 02:02 PM
    • Replies: 5
    • Views: 9,904
    03-27-2011, 01:38 PM Go to last post
  51. Which type of regression should I use?

    Hi I would appreciate if anybody can tell me what model to use in the following design: Predicting the behavior by personal/occupational...

    Started by victorxstc‎, 02-29-2012 02:28 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 9,902
    03-04-2012, 01:21 PM Go to last post
  52. Pearson's r help!

    Hi, I'm new to this forum, and glad I found it! I'm relatively new to stats too but am doing a Masters program that requires that I get my head...

    Started by angusthewestie‎, 11-29-2008 11:42 AM
    • Replies: 8
    • Views: 9,887
    11-29-2008, 05:57 PM Go to last post
  53. Test for linear trend

    Could anyone please offer some advice on how to test for linear trend. I am conducting a case control study looking at the associatio between folate...

    Started by Jiks‎, 07-19-2009 04:59 AM
    • Replies: 3
    • Views: 9,887
    07-19-2009, 06:17 PM Go to last post
  54. Sample size for mean with unknown standard deviation?

    I'm looking for a sample size for an experiment I'm doing. There isn't available data to get a standard deviation (looking at coefficient of friction...

    Started by uniquemeasures‎, 11-28-2010 10:26 AM
    • Replies: 3
    • Views: 9,875
    11-28-2010, 10:57 AM Go to last post
  55. What are the advantages of the mean squared error versus the mean absolute error?

    I understand the formulas for each, but don't understand the advantages of using one over the other. If you could provide a situation that would...

    Started by GreggAlexander‎, 07-15-2014 11:06 PM
    advantage, error metrics, mean absolute error, mean squared error
    • Replies: 2
    • Views: 9,870
    07-16-2014, 10:26 AM Go to last post
  56. Confounding and extraneous variables

    Hi all, Can someone please clarify the difference between a confounding and extraneous variable? I've read tonnes of explanations but still can't...

    Started by Kat‎, 07-01-2007 10:34 AM
    • Replies: 2
    • Views: 9,865
    04-20-2009, 04:09 PM Go to last post
  57. Mean split vs. median split

    Hi, Could anyone please explain to me what the exact difference between Mean split and median split? And which one much recommended? Many...

    Started by ghada8888‎, 03-26-2014 03:53 PM
    • Replies: 6
    • Views: 9,865
    03-27-2014, 03:57 PM Go to last post
  58. IID vs IIA; mixed vs conditional vs multinomial logit models

    I am reading books on categorical data analysis. are the assumption of indepently and identically distributed (errors terms) and independence of...

    Started by t.wang21@yahoo.com.au‎, 10-09-2011 06:50 AM
    • Replies: 7
    • Views: 9,855
    10-11-2011, 08:30 PM Go to last post
  59. correlation between 2 groups

    Hi I have given questionnaires to 50 participants, and i want to see if there are any differences in the mean values between those participants...

    Started by safig‎, 11-07-2009 04:46 AM
    • Replies: 14
    • Views: 9,847
    11-09-2009, 12:26 PM Go to last post
  60. two sample z test for proportions

    Hello! I am in need of some help! I am trying to run a 2 sample z test for proportions for my project and I think I did it right using my TI-83...

    Started by Katey‎, 06-09-2009 06:03 PM
    • Replies: 3
    • Views: 9,838
    06-29-2009, 06:50 AM Go to last post

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