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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. 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: 66,934
    09-30-2005, 09:44 AM Go to last post
  2. 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: 197,119
    07-16-2014, 11:01 AM Go to last post
  1. Trace of matrix product

    i need to prove that (xt)Ax = tr(Axxt) where xt is Xx transpose. please help me! I tryed but..nothing

    Started by alicia7‎, 10-11-2010 10:17 AM
    • Replies: 2
    • Views: 3,558
    10-11-2010, 03:38 PM Go to last post
  2. t-test

    Hi, I have the following "easy" problem: I am interesting in undertanding whether two groups of firms have the same mean return. The two groups are...

    Started by alicia7‎, 04-03-2012 09:32 PM
    • Replies: 1
    • Views: 1,389
    04-03-2012, 10:16 PM Go to last post
  3. Nonparametric Tests: Independent Samples

    Good Afternoon. I am new to the group and am hopeful that I can receive some advice here. I am a graduate student comparing two groups. The outcome...

    Started by AliciaR‎, 03-31-2012 02:36 PM
    • Replies: 4
    • Views: 2,390
    03-31-2012, 08:46 PM Go to last post
  4. 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: 10,307
    05-07-2013, 10:14 AM Go to last post
  5. Interpretation of a certain observation

    I have some identities that are distributed in a 2D space. Each identity has the properties X, Y, latitude, and longitude. Each dataset on average...

    Started by alijamali‎, 01-13-2017 03:17 PM
    correlation, statis, statisitcs
    • Replies: 2
    • Views: 2,350
    01-14-2017, 05:08 PM Go to last post
  6. Sampling distribution

    Hi, I have to calculate mean and standard deviation of sample means of size 30 (with replacement) from a population of size 87. Its impossible to...

    Started by alikhan44‎, 10-30-2012 06:39 PM
    large data sampling, sampling distribution, sampling with replacement, simple random sample
    • Replies: 0
    • Views: 1,237
    10-30-2012, 06:39 PM Go to last post
  7. Post Who can help me solve this problem, Thanks !!!!!!!

    Let y denote the sample average from a random sample with mean u and variance V, consider two alternative estimators of u, W1=, W2=y/2; Question...

    Started by alim_uyghur‎, 09-22-2014 09:46 PM
    • Replies: 1
    • Views: 2,164
    09-22-2014, 09:49 PM Go to last post
  8. Standard Deviation - Moving Range

    I would like to create an individuals control chart. I need to calculate the standard deviation using moving range. I was given the answer of 3.39. I...

    Started by Alinah‎, 07-09-2015 03:20 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 4,943
    07-15-2015, 03:04 PM Go to last post
  9. Errors and Standard Deviation

    Hello dear all! What type of error can be calculated if I have two replicates of each sample I measure? To calculate the standard deviation we...

    Started by AlinaM‎, 06-07-2011 12:08 PM
    • Replies: 4
    • Views: 2,038
    06-10-2011, 02:41 PM Go to last post
  10. Lightbulb Is Central Limit Theorm true for other statistics

    Dear friends, I have a question regarding Central Limit Theorem (CLT): Is Central Limit Theorm (CLT) true for other statistics such as variance,...

    Started by alireza‎, 09-14-2011 03:10 PM
    2 Pages
    1 2
    central limit theorm, other statistics
    • Replies: 17
    • Views: 6,936
    07-08-2012, 09:37 AM Go to last post
  11. Exclamation Why data standardization is necessary in Prinicple Component Analysis (PCA) ?

    Dear Guys, Hi. Generally the PCA process is described as follows: 1: Get some data 2: Standardize the data 3: Calculate the covariance matrix...

    Started by alireza‎, 11-05-2011 05:53 AM
    analysis, pca, principle component, standardizing sample, variance
    • Replies: 0
    • Views: 2,792
    11-05-2011, 05:53 AM Go to last post
  12. sequencing in m-balls and n-bins

    Hi, I'm doing my graduate study in computer science and I faced the following question in my thesis. suppose there are n bins and m balls. we...

    Started by alirezaMon‎, 01-09-2015 02:52 AM
    • Replies: 4
    • Views: 2,913
    01-14-2015, 03:19 PM Go to last post
  13. t-test for very low continues scores

    Hi, I have two dependent variabels (suicide related thoughts and suicide related behaviors) as these are present in very small percentage of...

    Started by aliriza.arenliu‎, 03-04-2009 12:44 PM
    • Replies: 0
    • Views: 1,597
    03-04-2009, 12:44 PM Go to last post
  14. using odds ratio for correlation

    Hi, we are working on a study using findings from 13 different countries on relation of substance use on suicide ideation and attempt. We...

    Started by aliriza.arenliu‎, 03-24-2015 06:46 AM
    • Replies: 1
    • Views: 1,475
    03-24-2015, 08:26 AM Go to last post
  15. Math Stat question

    im stuck with this question: Consider the prior distribution for the Bernouli parameter p with p.d.f g(p) proportional to 1/sqrt(p(1-p) for...

    Started by aliso-Econ-Stat‎, 12-16-2010 08:11 AM
    • Replies: 1
    • Views: 3,628
    12-16-2010, 11:28 AM Go to last post
  16. Variance

    If mean squared error is the variance: varX-bar=((theta)^2)/12 How does var2X-bar look like? Hope someone can help! Thanks!

    Started by aliso-Econ-Stat‎, 12-16-2010 07:27 PM
    • Replies: 3
    • Views: 2,282
    12-16-2010, 10:06 PM Go to last post
  17. Question Fiducial Limits?

    Would anyone have even the slightest knowledge on this topic? I'm tying to get a general term for multiple lines/slopes on the one graph (would...

    Started by Alivetitan‎, 06-04-2009 05:51 AM
    • Replies: 0
    • Views: 5,574
    06-04-2009, 05:51 AM Go to last post
  18. How to compare groups with multiple categorical variables

    Hi: I need to compare to compare two groups with multiple categorical variables_ I cannot quite figure out how to do it in one analysis: i am...

    Started by alixlaferri‎, 07-09-2014 11:03 PM
    • Replies: 0
    • Views: 1,884
    07-09-2014, 11:03 PM Go to last post
  19. Comparing Volatility in 2 populations

    Have got data for 2 populations and am wanting to compare the volatility/variability between them. My initial thought was using a chi-squared...

    Started by ALK296‎, 12-11-2016 01:06 PM
    • Replies: 2
    • Views: 2,452
    12-12-2016, 12:40 AM Go to last post
  20. Propagate errors

    Hi I would like to ask this . Suppose that I have a really large sample, and I put the results of my observable in a histogram of N bins ....

    Started by Alkass‎, 10-30-2010 06:09 AM
    • Replies: 4
    • Views: 2,877
    10-30-2010, 10:24 AM Go to last post
    • Replies: 1
    • Views: 2,113
    11-07-2013, 12:13 AM Go to last post
  21. For Process Capability, what is Null Hypothesis

    1) That the ratio between the specs and the process spread should be one 2) That the ratio between the specs and the process spread should be larger...

    Started by alladin‎, 03-01-2015 08:46 PM
    • Replies: 2
    • Views: 3,845
    03-02-2015, 08:00 AM Go to last post
  22. Recently, steps have been made to substantially improve the process.

    Recently, steps have been made to substantially improve the process. A P chart has been plotted for some time. One would not be surprised to find...

    Started by alladin‎, 03-02-2015 07:32 PM
    • Replies: 0
    • Views: 2,712
    03-02-2015, 07:32 PM Go to last post
  23. (> one hour invested)

    I have spent more time than I should this one. Given that P(A or B) = 1/4, P(A) = 1/7, and P(A and B) = 1/9, find P(B). I've worked it many...

    Started by allan‎, 10-09-2012 04:14 AM
    • Replies: 1
    • Views: 1,380
    10-09-2012, 04:16 AM Go to last post
  24. Who's a Gambler?

    This is a fun one. The P(A) = 3/5. Find the "odds" of winning an A.

    Started by allan‎, 10-09-2012 04:23 AM
    • Replies: 5
    • Views: 1,781
    10-09-2012, 12:04 PM Go to last post
  25. Help with matrices?

    If X' X = (50, 300 ) (300, 1000) what is X? I can't seem to get four equations for the four unknowns, any help?

    Started by allan89a‎, 10-25-2011 10:10 AM
    • Replies: 4
    • Views: 2,170
    10-25-2011, 02:07 PM Go to last post
  26. single and two tailed question analysis

    Hi, and thanks for reading this.:yup: i have a study i've been doing, having received the 50 responses and now have to analyse the results. The...

    Started by allard‎, 01-23-2010 04:44 AM
    • Replies: 0
    • Views: 1,796
    01-23-2010, 04:44 AM Go to last post
  27. Which hypothesis test to use

    I'm doing an assignment and am just a bit rusty and confused. I don't want the answer to the question, just guidance on what sort of test to use. ...

    Started by alldaybrkfst‎, 09-14-2016 05:25 AM
    • Replies: 2
    • Views: 1,206
    09-14-2016, 09:40 AM Go to last post
  28. Project Guidance

    I'm designing a study of online reader comments to newspaper stories. Constructed two-week sample (representing three-month period) for six daily...

    Started by AllenB‎, 11-29-2011 04:21 PM
    • Replies: 1
    • Views: 1,805
    11-29-2011, 08:00 PM Go to last post
  29. Need help finding statistical forecasting method or formula.....

    Ive typically used historical production results to forecasting future production results; however, the past few years have presented us with some...

    Started by allenritch‎, 05-11-2010 10:11 AM
    • Replies: 0
    • Views: 2,540
    05-11-2010, 10:11 AM Go to last post
  30. Significance levels

    I was wondering if there was a statistical test that could be done that would compare one significance level to another?

    Started by alliandrina‎, 12-04-2008 08:18 PM
    • Replies: 2
    • Views: 2,487
    12-04-2008, 09:47 PM Go to last post
  31. Smile stats help!!!

    I have a question for youo.... I am not quite understand how to pick which formlulas for the different test when i have one tail and two tail...

    Started by allie7927‎, 11-19-2006 09:58 PM
    • Replies: 2
    • Views: 2,632
    11-22-2006, 06:10 PM Go to last post
  32. Talking Chi Squared forumla

    Hi--- I have written in my notes to formulas and i was just wondering if they are the same thing.... the first one is X squared = the sum...

    Started by allie7927‎, 11-22-2006 07:04 PM
    • Replies: 2
    • Views: 3,207
    11-24-2006, 11:56 AM Go to last post
  33. one tail or two tail tests

    Hello! I just have a quick question! How do I figure out whether I have one tail or a two tail test? This is the part where I am confused? So if...

    Started by allie7927‎, 11-27-2006 10:14 AM
    • Replies: 1
    • Views: 5,496
    11-27-2006, 10:29 AM Go to last post
  34. Anyone has The Practice of Statistics Prep for the AP Exam Supplement book?

    Does anybody has The Practice of Statistics Prep for the AP Exam Supplement book? Look like this...

    Started by alliecrowden‎, 06-07-2010 10:27 PM
    • Replies: 0
    • Views: 5,219
    06-07-2010, 10:27 PM Go to last post
  35. Need to find null & alternative hypothesis.. please help

    Here is the question: Determine if there is a difference in the proportion of votes he received in the two counties. N = Total # of...

    Started by alliexdork‎, 12-06-2008 04:12 PM
    • Replies: 1
    • Views: 2,739
    12-06-2008, 05:41 PM Go to last post
  36. MLE help

    Hey guys, I've a Linear Models assignment due in 3 weeks. Really appreciate some help in certain area(s). Here's the first part: I'll explain the...

    Started by allinorfold‎, 11-02-2009 11:07 AM
    • Replies: 4
    • Views: 2,552
    11-20-2009, 05:23 PM Go to last post
  37. P value from ANOVA tables

    Can someone please remind me how we calculate p values from given F values on the ANOVA tables. (using the tables).

    Started by allinorfold‎, 11-15-2009 08:09 PM
    • Replies: 1
    • Views: 2,450
    11-16-2009, 02:47 AM Go to last post
  38. study abroad

    hi to all, planstudyabroad.com are providing online free consultancy services for foreign education to all around the world. i got much useful...

    Started by allisfriend23‎, 05-07-2007 08:57 AM
    • Replies: 0
    • Views: 1,625
    05-07-2007, 08:57 AM Go to last post
  39. Probability help

    I'm trying to set up a probability analysis to determine if a recall is necessary. We found one of our 13 machines started to break down fairly...

    Started by allskewedup‎, 10-13-2006 11:53 AM
    • Replies: 0
    • Views: 1,835
    10-13-2006, 11:53 AM Go to last post
  40. is a paired sample better?

    What is the benefit (or not) of designing your project with paired subjects?

    Started by allthatjazz‎, 04-24-2009 07:49 AM
    • Replies: 0
    • Views: 2,048
    04-24-2009, 07:49 AM Go to last post
  41. Question Autocorrelation and comparing means......

    Hi All, I might be totally missing a key point here - or making a mountain out of a molehill, but I have been reading around and trying to find the...

    Started by Ally30‎, 04-07-2012 06:01 AM
    anova, autocorellation, dependence., non-parametric
    • Replies: 1
    • Views: 2,206
    04-07-2012, 09:05 AM Go to last post
  42. How best to account for seasonality when analysing bird monitoring data

    Hello All, I have some monitoring data from seabird surveys carried out in an offshore construction site. Surveys were undertaken before, during...

    Started by Ally30‎, 09-26-2012 01:18 PM
    glm, glmm, interpreting results, monitoring data
    • Replies: 1
    • Views: 1,603
    09-30-2012, 01:43 AM Go to last post
  43. Post Probability situation HELP!

    A special school size of 1,500 students, with 60% boys and 40% girls. Each day, the principle chooses 10 students for cleaning bathrooms but does not...

    Started by ally514‎, 01-29-2013 07:45 PM
    • Replies: 1
    • Views: 3,136
    01-29-2013, 11:11 PM Go to last post
  44. Post-hoc sample size analysis

    Hi, I'm new to the forums, I'm hoping I post it in the right place. I'm doing an MSc dissertation at the moment. I have the programme SPSS sample...

    Started by allyfer‎, 08-25-2011 04:28 PM
    • Replies: 1
    • Views: 2,654
    08-25-2011, 04:32 PM Go to last post
  45. Interesting correlation problem

    This message has been relocated to a different chapter

    Started by almar‎, 01-04-2011 11:50 AM
    • Replies: 0
    • Views: 2,275
    01-04-2011, 11:50 AM Go to last post
  46. Central Composite Results Conflict with One-Way ANOVA results

    I have a project that I have been working on. I designed a half central composite with 5 factors and 5 levels. I had a total of 33 samples. From that...

    Started by Almighty‎, 08-03-2010 12:38 PM
    • Replies: 0
    • Views: 4,715
    08-03-2010, 12:38 PM Go to last post
  47. please help

    Hi all Can I get some help from you, I am a research student I developed questionnaire to get some information but after I get the results I am...

    Started by almohandes‎, 08-09-2006 07:04 AM
    • Replies: 2
    • Views: 2,476
    08-18-2006, 05:43 AM Go to last post
  48. Standardizing or normalizing two different sales variables before regression?

    Hello there :wave:, I'm currently involved in research, but I have to admit that I'm quite insecure in my math / statistics abilities, which is...

    Started by almostthere‎, 04-03-2014 09:43 AM
    normalize dataset
    • Replies: 0
    • Views: 2,584
    04-03-2014, 09:43 AM Go to last post
  49. Question Mean centring: confused about instructions by supervisor?

    Hello everyone, I am really desperate and I would really appreciate it if someone could help me out. My thesis supervisor is a very busy guy, and...

    Started by almostthere‎, 04-30-2014 04:51 PM
    • Replies: 1
    • Views: 1,364
    05-01-2014, 07:00 AM Go to last post
  50. Which test for my data analysis?

    Following this paragraph is my method to my research proposal. The next step I need to do is the planned analysis. I have absolutely no idea how to...

    Started by alockerby‎, 11-06-2013 02:21 PM
    planned analysis, research proposal, statistics, tests
    • Replies: 1
    • Views: 1,612
    11-06-2013, 02:27 PM Go to last post
  51. Roulette Probability Problem

    Hello all, I am having trouble with solving this roulette problem. Play double zero roulette game. Pick odd/even +1, -1, (18/38) and (20/38)...

    Started by Alone2Gether‎, 11-14-2006 01:38 AM
    • Replies: 1
    • Views: 3,926
    11-16-2006, 11:07 PM Go to last post
  52. ancova

    Hello, I have a set of data (Xi,Yi) to which I fit a curve: Y=a*X^b, I use matlab to determine a and b. I also have a model equation: Y=a0*X^b0....

    Started by Aloulou‎, 09-23-2013 05:41 PM
    • Replies: 0
    • Views: 1,130
    09-23-2013, 05:41 PM Go to last post
  53. Analysing ranked data

    I had following question in my questionnaire: Rank following factors: price, quality, advertisement, brand, reference from 1 (very important) to 5...

    Started by alova‎, 09-22-2014 10:09 AM
    cluster, factor, rank
    • Replies: 0
    • Views: 1,424
    09-22-2014, 10:09 AM Go to last post
  54. Question Regression analysis of ranked data

    The depended variable is Binary data and independent variables are ranks from 1 to 5. What methods i suppose to use in order to see relationship...

    Started by alova‎, 09-23-2014 02:12 AM
    logit regression, rank, regression
    • Replies: 3
    • Views: 1,987
    09-23-2014, 07:26 AM Go to last post
  55. Determining sample dependence

    How do you determine if samples are independent? I know that test scores of two separate groups of students are independent. Before-and-after...

    Started by alphacheese‎, 12-06-2012 11:25 PM
    • Replies: 1
    • Views: 1,234
    12-06-2012, 11:38 PM Go to last post
  56. Exclamation Help Selecting a Model

    People, First of all, this is my first time in this forum, so hello to everyone. That said, I am working on a class investigation concerning...

    Started by alphaelement‎, 02-22-2009 12:35 PM
    • Replies: 0
    • Views: 1,874
    02-22-2009, 12:35 PM Go to last post
  57. Planned pairwise comparisons

    In running the contrast analyses, when looking at the tests of within subjects effects, sphericity is violated. Do I need to adjust the degrees of...

    Started by alphaland‎, 12-03-2009 08:34 PM
    • Replies: 0
    • Views: 5,031
    12-03-2009, 08:34 PM Go to last post
  58. Can Phi Coefficient be used as an effect size for Chi-Square Goodness of Fit tests?

    Flip a coin 100 times -> 48 H, 52 T Null - coin follows a specified distribution Run a chi-square goodness of fit test using 48, 52 and 50, 50 I...

    Started by alphaqn69‎, 04-28-2011 02:53 PM
    goodness of fit, phi coefficient
    • Replies: 1
    • Views: 4,864
    04-28-2011, 05:13 PM Go to last post
  59. Light bulbs problem

    .....................................................................

    Started by alphaville‎, 10-21-2012 12:31 PM
    • Replies: 0
    • Views: 1,565
    10-21-2012, 12:31 PM Go to last post

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