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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: 66,691
    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: 196,672
    07-16-2014, 11:01 AM Go to last post
  1. hypothesis

    Hi all, I have homework like this, it hard to me, please help 1/ Random samples of 1600 workers in Region 1 and 1400 workers in Region 2 have been...

    Started by anthonyalex‎, 03-23-2015 03:05 AM
    • Replies: 2
    • Views: 2,334
    03-24-2015, 12:56 AM Go to last post
  2. help me solve these problems

    I have two problem, please help, 1/ In a study of flight attendants, salaries paid by two different airlines were randomly selected. For 41...

    Started by anthonyalex‎, 03-24-2015 01:00 AM
    • Replies: 1
    • Views: 2,636
    03-24-2015, 03:41 AM Go to last post
  3. hypothesis testing question

    Of a random sample of 100 families in Richmond, 60 own a house. Is there sufficient evidence at the 0.05 level of significance to conclude that most...

    Started by anthonys‎, 04-01-2006 05:22 PM
    • Replies: 0
    • Views: 2,028
    04-01-2006, 05:22 PM Go to last post
  4. infinite lag distribution proof

    asdddddddddddddddddddddddddd

    Started by anths88‎, 05-24-2010 08:31 AM
    • Replies: 1
    • Views: 3,761
    05-24-2010, 11:57 AM Go to last post
  5. Proof unit price elasticity

    Hey guys I'm a bit stumped on this question and i know it should probably be easy but can you please help me out. The Demand function for an asian...

    Started by anths88‎, 08-12-2010 06:57 PM
    • Replies: 3
    • Views: 5,891
    08-13-2010, 09:57 PM Go to last post
  6. Question Statistics Final Exam Question

    Due to some gray area in a TA's grading, I am going to review my statistics final with my professor on Friday. There's some possibility of a grade...

    Started by Antikythera‎, 05-26-2012 05:41 AM
    alpa, beta, power, probability question, type 1 type 2 error
    • Replies: 1
    • Views: 1,777
    05-26-2012, 10:24 AM Go to last post
  7. Question How to comment a projection of data in Principal Composant Analysis?

    From: A=\begin{bmatrix} 1 & 0 & 0\\ 0 & 0 & 1\\ 0 & 1 & 2\\ 2 & 2 & 1\\ 1 & 0 & 0\\ 2 & 3 & 2\\ \end{bmatrix}

    Started by AntoineCompagnie‎, 12-20-2015 12:08 PM
    principal components
    • Replies: 0
    • Views: 955
    12-20-2015, 12:08 PM Go to last post
  8. Odds ratio/ Confidence Interval

    Q1. IF the chi-square value equals 6.51 from a sample size of 56. What would we immediately know about the values of the lower and upper bound values...

    Started by antoined‎, 04-06-2011 08:00 AM
    • Replies: 1
    • Views: 3,443
    04-06-2011, 08:09 AM Go to last post
  9. Probability to partake in either of two activities

    Hello! I am facing the following problem. I am trying to determine which one two activities gets preferred by the participants. I have lain out...

    Started by antologic‎, 03-14-2012 02:44 AM
    • Replies: 11
    • Views: 3,217
    04-03-2012, 03:41 AM Go to last post
  10. Formula

    Hi, Does anyone know the formula used to calculate this Random Variable X has mean 20 and standard deviation 5. Random variable Y has mean 35...

    Started by AnTon‎, 06-04-2008 08:07 PM
    • Replies: 1
    • Views: 3,061
    06-04-2008, 08:17 PM Go to last post
  11. Hypothesis Test

    n=45 sample mean = 17.1 sample std dev = 6.4 What is the probability that the sample mean differs from the true mean by 2 or more? Thanks in...

    Started by AntonChigurh‎, 08-16-2016 12:21 PM
    • Replies: 3
    • Views: 1,318
    08-27-2016, 04:33 PM Go to last post
  12. Lightbulb How many mothers with shoolkids (scholars, pupils). COFFEE inside

    Hello! INSANE REQUEST: There are 22.681M school age kids in Philippines, how many MOTHERS (or FATHERS) do they have? Knowing that the...

    Started by AntonF‎, 12-04-2016 07:22 PM
    • Replies: 6
    • Views: 2,148
    12-05-2016, 04:35 PM Go to last post
  13. coefficient of determination with Kendalls tau

    I know I can use a coefficient of determination with Chi square, but I need to know if I can use it with Kendall's tau. I'm working on my...

    Started by antoniac‎, 03-09-2009 06:13 PM
    • Replies: 0
    • Views: 3,544
    03-09-2009, 06:13 PM Go to last post
  14. Question Which statistical test should i use ???

    Im doing my dissertation looking at suicide rates in Liverpool from 2007 to 2010. I want to explore the relationship between age and gender and how...

    Started by antonia_mcvey‎, 03-25-2011 07:36 AM
    • Replies: 2
    • Views: 4,881
    04-06-2011, 06:23 AM Go to last post
  15. Choice of the statistical method

    Hi, I am new in statistics and I am writing here to get some hint for my research. I run a survey and now I got to process the answers. The example...

    Started by antonio5982‎, 10-03-2011 03:27 AM
    • Replies: 1
    • Views: 1,465
    10-03-2011, 11:32 AM Go to last post
  16. Question Canonical correspondence analysis using only 1 environmental variable?

    Hi everybody, after being challenged by my supervisor to find the most suitable ordination technique to relate a veg communities to an environmental...

    Started by antoniouzal‎, 01-25-2010 09:13 AM
    • Replies: 0
    • Views: 2,976
    01-25-2010, 09:13 AM Go to last post
  17. Performing a t-test on averages??

    Is it "statistically legal" to perform a t-test on the averages of two groups? In other words, the data set values are averages themselves (example:...

    Started by antstat‎, 02-25-2013 04:59 PM
    averages, mean of means, pseudo-replication, t-test, ttest
    • Replies: 0
    • Views: 1,512
    02-25-2013, 04:59 PM Go to last post
  18. Bias

    I know only one definition of bias in statistics: the expected difference between the estimator and the parameter. Are there any alternative...

    Started by Anttila‎, 09-13-2017 07:25 AM
    • Replies: 3
    • Views: 261
    09-13-2017, 09:43 AM Go to last post
  19. How to test for differences in annual changes?

    am working on insurance data. My goal is to test the effectiveness of a campaign. I need to test the hypothesis whether the "year on year percentage...

    Started by anuj‎, 09-20-2011 08:18 AM
    hypothesis testing
    • Replies: 0
    • Views: 1,539
    09-20-2011, 08:18 AM Go to last post
  20. Test of equal variance

    when to perform test for equal variance, is it necessary to perform "Test of equal variance" before performing One Way AVAONA

    Started by anurag‎, 07-09-2014 09:13 AM
    anova, test of equal variance
    • Replies: 3
    • Views: 1,666
    07-09-2014, 01:35 PM Go to last post
  21. Z-scores or mean +/- 2 std rule

    Given this dataset... 20010930 638,101 20011231 540,155 20020331 702,649 20020630 950,992 20020930 642,489 20021231 670,363 20030331 965,436...

    Started by Anusha‎, 05-02-2006 02:10 PM
    • Replies: 3
    • Views: 3,066
    05-02-2006, 04:53 PM Go to last post
  22. Question P value interpretation

    Hi , I am having a hard time understanding the concept of p value and also its interpretation. I know that I can interpret a p value of 0.80 as...

    Started by anushaka‎, 11-23-2011 08:24 AM
    2 Pages
    1 2
    • Replies: 22
    • Views: 39,149
    11-28-2011, 02:45 PM Go to last post
  23. Cool F test in TGARCH, EGARCH, etc

    why the F test in TGARCH and EGARH model is always failed to reject Ho? anyone know the null hipothesis?

    Started by anwarlatif‎, 06-12-2012 12:39 PM
    • Replies: 0
    • Views: 2,031
    06-12-2012, 12:39 PM Go to last post
  24. Individual Item T Test Question

    Hi. I have a 18 item 5-point Likert type attitudinal pre-test and same 18 item post test. A group of 25 individuals completed a pretest then were...

    Started by ANXIETYPRONE‎, 06-11-2013 03:28 PM
    • Replies: 2
    • Views: 1,408
    06-12-2013, 04:16 AM Go to last post
  25. Which Test should I use

    Hi. A have a group of 200 law students who have finished their first year. They have completed a total of 7 courses. I am interested in being able to...

    Started by ANXIETYPRONE‎, 06-19-2013 04:17 PM
    • Replies: 1
    • Views: 1,302
    06-20-2013, 03:01 AM Go to last post
  26. 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: 7,600
    05-15-2008, 03:31 AM Go to last post
  27. Hosmer-Lemeshow Test Table Interpretation

    Hi! I need someone to interpret this. Sorry, I got no knowledge at all. I tried searching the forum but the analysis chapter of my thesis keeps on...

    Started by Anylopectina12‎, 04-23-2014 09:06 AM
    • Replies: 6
    • Views: 4,159
    05-01-2014, 10:19 PM Go to last post
  28. time series forecasting air pollution

    Hi there, I was reading this article that says that IBM will be able to forecast air pollution 3 days in advance. ...

    Started by aoife‎, 08-22-2014 06:24 AM
    • Replies: 0
    • Views: 1,110
    08-22-2014, 06:24 AM Go to last post
  29. Entering interaction terms

    I am new to this site, but have high hopes that I can find some relief. I have a question regarding entering interaction terms (moderation) in...

    Started by aosborn‎, 01-20-2015 01:59 PM
    interaction, logistic regression, moderate, spss
    • Replies: 6
    • Views: 1,443
    01-20-2015, 08:14 PM Go to last post
  30. Regression Question

    Hey Everyone, I'm having trouble with a case for grad school (MBA program). I have 5 years of monthly time series data for a manufacturing...

    Started by aotke1110‎, 11-11-2011 04:51 PM
    • Replies: 4
    • Views: 2,374
    11-11-2011, 06:11 PM Go to last post
  31. How to determine sample size for a cost-per-conversion experiment

    Hi all, I am trying to perform a scientific experiment in online marketing which would be focused on lowering the cost per customer acquisition. ...

    Started by aparra‎, 10-27-2016 08:51 AM
    conversion, cost-effectiveness
    • Replies: 0
    • Views: 624
    10-27-2016, 08:51 AM Go to last post
  32. Replicated Latin square design

    Replicated 5x5 Latin square design where there are two observations in each of the 25 cells of the design. How many degrees of freedom will...

    Started by apatel‎, 03-02-2009 07:28 AM
    • Replies: 0
    • Views: 5,069
    03-02-2009, 07:28 AM Go to last post
  33. Which ANOVA would be this?

    Just getting confused but here is my work : I think since there are 2 independant measures(not shown here) and there are different participants used...

    Started by apatel‎, 03-29-2009 11:37 AM
    • Replies: 1
    • Views: 1,402
    04-13-2009, 11:47 PM Go to last post
  34. difference statistics

    I have a few queries: 1. I am investigating into how beach nourishment schemes affect rates of change on a beach, so for 27 locations I have the...

    Started by apb‎, 02-22-2008 12:00 PM
    • Replies: 0
    • Views: 2,515
    02-22-2008, 12:00 PM Go to last post
  35. Calculating SATS-36 score for a group of students?

    Hey guys, i just joined this and hope someone could help me out ?? I am currently undertaking a project at my university on students' attitudes...

    Started by Apd41‎, 01-30-2011 10:47 AM
    • Replies: 0
    • Views: 2,053
    01-30-2011, 10:47 AM Go to last post
  36. Statistical Significance

    Hi I'm kinda new at statistics. I was wondering if it would be correct to say that the response rate that you get back from a survey is...

    Started by apdragon‎, 01-29-2009 02:29 PM
    • Replies: 7
    • Views: 4,493
    01-30-2009, 04:35 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: 8,312
    05-07-2012, 04:03 AM Go to last post
  38. Comparing Likert-type scales

    Please Help! I have looked at other threads on this site regarding Likert scales but was not able to find one directly related to the question I...

    Started by apdragon‎, 02-01-2010 11:05 PM
    • Replies: 1
    • Views: 5,829
    02-10-2010, 04:52 PM Go to last post
  39. What test is best!

    Hopefully this is a quick question for all you statistic gurus! If I am using the same survey to measure the same respondents to a 10 session...

    Started by apdragon‎, 05-24-2010 11:59 AM
    • Replies: 1
    • Views: 2,024
    05-24-2010, 09:12 PM Go to last post
  40. help which test?

    ok if I have 2 proportions from 2 different times but these are not fully paired data, would I do a case-wise deletion of unpaired data and use...

    Started by apdragon‎, 11-08-2010 03:56 AM
    • Replies: 0
    • Views: 2,040
    11-08-2010, 03:56 AM Go to last post
  41. post hoc test for chi-square

    ok this might be a newbie question but lets say I have data that I have cross tabbed for location and level of agreement. A ...

    Started by apdragon‎, 12-22-2011 12:27 AM
    • Replies: 6
    • Views: 10,635
    12-22-2011, 06:07 PM Go to last post
  42. [SPSS] Comparing groups: variances are not equal

    Hi, I have a data set which is normally distributed but the variances are not equal. I did transformation but this not work. which kind of test I...

    Started by Aphid‎, 03-15-2015 04:59 AM
    • Replies: 3
    • Views: 1,664
    03-16-2015, 06:36 AM Go to last post
  43. Unhappy Confused!

    Hi, I have re-copied a question from my textbook and am confused as to what is meant by the question. I would really appreciate it if someone could...

    Started by Aphrodite‎, 05-27-2009 05:57 PM
    • Replies: 0
    • Views: 3,352
    05-27-2009, 05:57 PM Go to last post
  44. Time Series/Trouble Identifying Model Type

    Here is the question that I have: I'm having trouble identifying what kind of model that is. It looks like ARMA(2,1), but using first order...

    Started by APOCooter‎, 11-28-2012 04:32 PM
    • Replies: 0
    • Views: 1,284
    11-28-2012, 04:32 PM Go to last post
  45. Finding sum of mu(column)-mu

    The question: I started with constructed an ANOVA table and worked backwards to get a value for SSE = 900 since I was dumb and thought ...

    Started by APOCooter‎, 02-16-2013 01:38 PM
    • Replies: 0
    • Views: 1,697
    02-16-2013, 01:38 PM Go to last post
  46. Fractional Factorial Experiment Design

    I know that to get the alias rows with the main factor effects, I use mod 2 multiplication with the main effects and the elements of the defining...

    Started by APOCooter‎, 05-05-2013 01:06 PM
    • Replies: 0
    • Views: 877
    05-05-2013, 01:06 PM Go to last post
  47. Find the 95th percentile of a sampling distribution

    I think I've got this, but I just want to confirm: I know that Z^2 follows a Chi-Square distribution with 1 degree of freedom. So to find the...

    Started by APOCooter‎, 09-08-2013 09:57 PM
    • Replies: 2
    • Views: 4,383
    09-08-2013, 10:16 PM Go to last post
  48. Show the two forms of the sample variance are equivalent

    Show that the two forms are equivalent: \frac{1}{n-1} \sum_{i=1}^n (Y_i - \bar{Y})^2 = \frac{1}{2n(n-1)}\sum_{i=1}^n \sum_{j=1}^n (Y_i-Y_j)^2 I...

    Started by APOCooter‎, 09-12-2013 02:23 PM
    • Replies: 7
    • Views: 2,412
    09-12-2013, 09:07 PM Go to last post
  49. Finding MLE of a transformation

    I think calling it a transformation is most accurate, anyways. Let X_1, X_2, \cdots , X_n ~ N(\theta, 1). Define Y_i = 1 if X_i > 0 or Y_i =...

    Started by APOCooter‎, 10-24-2013 05:47 PM
    • Replies: 9
    • Views: 2,293
    11-03-2013, 09:11 PM Go to last post
  50. Generating random variables without using inversion method.

    Suppose that X has the pdf f(x) = |\frac{x}{4}| for -2 < x < 2. Draw f(x) and determine a method to generate X without using the inversion method. ...

    Started by APOCooter‎, 11-30-2013 09:38 PM
    • Replies: 2
    • Views: 1,967
    12-01-2013, 01:59 PM Go to last post
  51. Two rejection method problems

    I'm rather shaky on the rejection method. I understand it in concept, but actually doing it... yeah. The first question involves the pdf f(x) =...

    Started by APOCooter‎, 12-02-2013 11:16 AM
    • Replies: 2
    • Views: 1,020
    12-02-2013, 04:33 PM Go to last post
  52. A couple linear algebra questions (including SAS proc iml)

    EDIT: \sigma should be capital sigma, the covariance matrix, but I can't remember how to write it. First question Looking at Z, it's fairly...

    Started by APOCooter‎, 02-06-2014 03:52 PM
    • Replies: 1
    • Views: 1,612
    02-06-2014, 04:04 PM Go to last post
  53. Determining defining contrast subgroup from design matrix

    I have the following design for studying five variables in eight runs in four blocks of size two (k=5, p=2, q=2) \begin{tabular}{rrlllllll} ...

    Started by APOCooter‎, 04-15-2014 03:13 PM
    • Replies: 1
    • Views: 3,241
    04-15-2014, 03:16 PM Go to last post
  54. Two way anova with no interaction

    Information-a research psychologist is interested in determining the effects of high versus low intensity shock on the the memorization of a hard...

    Started by apohle‎, 11-02-2009 11:00 PM
    • Replies: 1
    • Views: 3,016
    11-03-2009, 10:34 AM Go to last post
  55. t-test:is it worth using if sample size is very small and results are very different?

    Dear all, As part of a lab practical, I am comparing nitrite concentration in two different samples (sample 1 and 2). I only have three data for...

    Started by aponi11‎, 03-16-2016 07:28 AM
    • Replies: 3
    • Views: 1,961
    03-16-2016, 11:44 AM Go to last post
  56. Standard Error of the Mean

    I need to know how to combine data from two groups of means. They both have standard deviation and SEM's calculated for them each. If I then divide...

    Started by Apothad‎, 01-31-2008 12:08 PM
    • Replies: 0
    • Views: 2,040
    01-31-2008, 12:08 PM Go to last post
  57. Restricted maximum likelihood (REML)

    Hello everyone, For my Bachelor's thesis I have to estimate an overall mean and standard deviations using the restricted maximum likelihood (REML)...

    Started by Appeltaart‎, 05-26-2015 08:44 AM
    • Replies: 0
    • Views: 1,322
    05-26-2015, 08:44 AM Go to last post
  58. MANOVA with dependent observations

    Hi all, I am trying to do a MANOVA with four dependent variables and one independent variable consisting of four levels in SPSS. The problem is...

    Started by Appie‎, 10-19-2010 06:02 AM
    • Replies: 0
    • Views: 1,986
    10-19-2010, 06:02 AM Go to last post
  59. Floor and ceiling effects when measuring change

    I am using a psychological measure with possible scores of 1 to 20. This is measured twice in the same participants (with 5 years between T1 and T2)....

    Started by apple‎, 05-27-2009 07:04 PM
    • Replies: 0
    • Views: 6,550
    05-27-2009, 07:04 PM Go to last post
  60. plz help on any of these Q's

    1. What can be seen by looking at a control chart of a dataset that can't be seen in a histogram, boxplot, or stem-and-leaf plot? I think it is time...

    Started by apple43‎, 12-08-2008 07:27 PM
    • Replies: 4
    • Views: 2,364
    12-08-2008, 10:31 PM Go to last post

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