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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: 196,643
    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: 66,668
    09-30-2005, 09:44 AM Go to last post
  1. mode of the chi-square distribution

    I don't understand why the mode of the chi-square dist is df-2. With three categories, the mode would be 1, that is, the distribution would have its...

    Started by joeygor‎, 10-04-2010 09:47 PM
    • Replies: 10
    • Views: 10,676
    11-16-2010, 11:42 PM Go to last post
  2. t distribution for Proportion impossible?

    Good afternoon, What are the reasons that we only use Z distribution for proportion confidence intervals, but we can use both Z and t...

    Started by mysterdusk‎, 10-18-2010 11:55 PM
    • Replies: 10
    • Views: 18,764
    02-23-2011, 05:01 PM Go to last post
  3. Dependant and Independant variable

    Hi I have a very simple scenario. I have two variables - Educational technology and Achievement, both continuous. I have also have number of sub...

    Started by rockyallen7771‎, 12-13-2010 07:50 AM
    • Replies: 10
    • Views: 4,017
    12-13-2010, 10:04 AM Go to last post
  4. E(X), E(Y) and E(X&Y)

    I have solved E(X), E(Y) and E(X&Y) before but not when multiple x's and y's are given. I honestly do not know how to do it. Kindly enlighten my...

    Started by dEconomist‎, 03-08-2011 02:05 PM
    • Replies: 10
    • Views: 3,048
    03-09-2011, 03:27 AM Go to last post
  5. Comparing percentages

    I'm having trouble wrapping my head around some of this. I need to determine whether or not there is a statistical difference between two...

    Started by amperes‎, 03-28-2011 11:33 PM
    • Replies: 10
    • Views: 32,889
    10-11-2011, 03:31 PM Go to last post
  6. Standard Deviation with values of zero in population

    Hey, let's say I want to find the standard deviation for a small population, and a lot of the results = zero, is there a way to compensate? For...

    Started by cpaavola‎, 05-30-2011 04:09 PM
    • Replies: 10
    • Views: 8,703
    05-30-2011, 11:23 PM Go to last post
  7. One-way ANOVA homework help

    My teacher asked the following (and the first part of my answer is included): 1. We are interested whether Motivation (mot) is different among...

    Started by ALT803‎, 12-02-2011 05:02 PM
    • Replies: 10
    • Views: 3,224
    12-02-2011, 06:17 PM Go to last post
  8. Determining influence on test score

    Hello, I'm trying to determine how some tasks (nominal, ordinal) on one test influence the total score of the test (ratio). As I searched, linear...

    Started by krojc‎, 08-01-2011 01:31 AM
    • Replies: 10
    • Views: 2,821
    08-01-2011, 10:08 AM Go to last post
  9. Sig Test

    Uhhhhh!!!! I don't know what the heck I'm doing. Two samples.... Sample one.... let's call them the 'hairy helmets'.... # = 49, mean = .83,...

    Started by agutts6‎, 08-24-2011 05:12 PM
    earthquakes, racist, significance
    • Replies: 10
    • Views: 4,071
    08-24-2011, 06:13 PM Go to last post
  10. When to assume Normality

    I am working with a rather large sample (approximately 120). Typically, I would not have any issues justifying normality due to the large sample size...

    Started by lancearmstrong1313‎, 10-15-2011 04:21 PM
    assumptions, normality, sample size
    • Replies: 10
    • Views: 11,126
    10-15-2011, 07:43 PM Go to last post
  11. CFA vs. SEM

    I hypothesized a 4-factor model for my data and SEM supported this, but CFA suggested 5 factors (see results below). Why might this difference be and...

    Started by SarahKS‎, 11-02-2011 03:32 PM
    • Replies: 10
    • Views: 10,311
    11-03-2011, 06:33 PM Go to last post
  12. Question Matrix regression: Prove H1=1 (H=hat matrix)

    I couldn't find a way to prove this... Prove H1=1 (H=hat matrix; 1=column vector of n 1s) I thought that it's "obvious" since the...

    Started by Patrick Yan‎, 11-13-2011 02:12 AM
    • Replies: 10
    • Views: 6,217
    11-14-2011, 01:37 AM Go to last post
  13. Probability question

    This question shouldn't be very hard but I don't know which formula to use or how to go about getting the answer, which is .0668. Here's the...

    Started by Pythons80‎, 12-04-2011 05:11 PM
    • Replies: 10
    • Views: 2,345
    12-05-2011, 05:56 PM Go to last post
  14. Regression or Chi-Square?

    Hi, I have a question about my project. I am confused whether to use regression or chi-square. I need to find the relationship between the...

    Started by milehigh899‎, 06-14-2012 01:36 PM
    • Replies: 10
    • Views: 2,389
    06-15-2012, 09:19 AM Go to last post
  15. 2 Questions on quality improvement

    Q1. My p-chart from data below saw that the process is out of control. What should a team do now regarding this data?

    Started by student865‎, 12-08-2011 03:43 PM
    • Replies: 10
    • Views: 1,927
    12-08-2011, 05:02 PM Go to last post
  16. Question martingales problem....

    3) Let Xn be a simple random walk starting at 0. Which of the following are martingales and why? a) (Xn )*(Xn) B) (3Xn)*(3Xn)-9n

    Started by jony‎, 12-09-2011 10:54 PM
    • Replies: 10
    • Views: 2,973
    12-13-2011, 12:04 AM Go to last post
  17. Sampling from a Sub Sample and Normality Assumption

    Say I have sample data (let's call it XYZ) that is drawn from another survey (the US Current Population Survey). This entails that the universe of my...

    Started by StatsScared‎, 08-07-2013 11:47 AM
    sampling normality
    • Replies: 10
    • Views: 2,745
    08-10-2013, 03:36 PM Go to last post
  18. [Analysis of Variance] - Repeated-measures True or False

    1. The magnitude of the variance due to individual differences must be measured and subtracted out of the variance between treatments in the...

    Started by n00bl3t‎, 01-05-2012 11:33 PM
    • Replies: 10
    • Views: 4,609
    01-06-2012, 01:49 AM Go to last post
  19. Effect size for Wilcoxon Signed Rank

    1) i want to calculate the effect size for wilcoxon signed rank (paired sample). I have one group of 10 participants. I know the formula for the...

    Started by lynnar‎, 01-22-2012 08:05 PM
    effect size, non parametric
    • Replies: 10
    • Views: 15,937
    01-04-2013, 04:02 PM Go to last post
  20. Exclamation Help Please. SEM Modelling Problem.

    Hi, I need Your help regarding SEM modelling. I don't have background on statistic & been stuck this 2 month on statistic. :( I already read...

    Started by wirya‎, 01-25-2012 04:16 PM
    • Replies: 10
    • Views: 2,517
    01-26-2012, 10:23 PM Go to last post
  21. [SOLVED] Needing help

    Hi, If I have two independent groups (nominal data; normally distributed) and am determining if there is a difference in the groups on 8 or 10...

    Started by I'm dying here‎, 01-27-2012 09:48 PM
    • Replies: 10
    • Views: 2,186
    01-28-2012, 08:43 PM Go to last post
  22. Help with choosing a statistical test for 2 treatment groups

    Can someone help with choosing an appropiate statistical test? I have 2 treatment groups each with more than 4 replicates but for each replicate I...

    Started by caroline_stats‎, 02-06-2012 09:04 AM
    • Replies: 10
    • Views: 2,373
    02-06-2012, 03:12 PM Go to last post
  23. Why does sample std dev underestimate population std dev?

    The subject line is too short for me to word out my question properly: Why does (square root of unbiased estimator for population variance)...

    Started by johnc‎, 02-08-2012 12:02 AM
    deviation, jensen's inequality, standard, variance
    • Replies: 10
    • Views: 11,861
    05-08-2012, 09:38 AM Go to last post
  24. Why are statistics so 'powerful'?

    In referring to statistics and statistics software, I keep seeing the word 'powerful' being used. But what exactly does 'powerful' mean? ...

    Started by Layo909‎, 02-16-2012 11:25 AM
    • Replies: 10
    • Views: 3,629
    02-18-2012, 08:06 AM Go to last post
  25. Cognitive Dissonance about Likert Scale

    I am wondering if the typical format of the Likert Scale creates cognitive dissonance for survey respondents. The Likert Scale is bipolar (e.g....

    Started by fpetillo‎, 02-29-2012 05:21 PM
    coding, likert, scales
    • Replies: 10
    • Views: 2,924
    03-01-2012, 09:33 AM Go to last post
  26. Poll Poll: calculate Rho & Test the significance of Rho

    calculate Rho & Test the significance of Rho? Students Ranks in UG Exam (X) Ranks in Entrance Test (Y) A ...

    Started by nuur34‎, 03-12-2012 02:46 PM
    please help me on this, thanks in advance
    • Replies: 10
    • Views: 6,679
    03-17-2012, 01:04 PM Go to last post
  27. Question Pool data from individuals in sign test or Fisher's exact test - valid or pseudorep?

    Hi all! My intuition is telling me a particular approach is valid even though is appears to go against the principle of not pooling multiple data...

    Started by amorphia‎, 03-13-2012 06:40 AM
    • Replies: 10
    • Views: 2,877
    03-16-2012, 04:52 AM Go to last post
  28. Structure equation model formulas

    Hello everyone! For my thesis I need to build an agent-based simulation based on a paper. The authors employed structural equation modeling. In...

    Started by mueslihippie‎, 03-15-2012 05:39 AM
    • Replies: 10
    • Views: 3,155
    03-16-2012, 12:04 PM Go to last post
  29. Want to compare students with uneven number of tests taken

    Is it possible to compare students with uneven number of tests taken? I would like to repeat this test again, so any assistance for an old guy...

    Started by BadMonkey‎, 05-04-2012 03:59 PM
    scores, uneven tests taken
    • Replies: 10
    • Views: 2,417
    05-04-2012, 09:07 PM Go to last post
  30. Testing the utility of a model with F-test and T-test

    Hello, I just needed some help understanding some concepts. To test a first order model with several predictor variables, you use the F test. I...

    Started by Stickstat‎, 05-08-2012 05:13 PM
    • Replies: 10
    • Views: 11,786
    05-09-2012, 01:39 PM Go to last post
  31. One sample t-test

    Hi, This is probably an embarrassingly easy problem but I've looked all over the place and I can't seem to find the answer, or at least I don't...

    Started by adancer‎, 05-19-2012 02:44 PM
    mean of means, t-test
    • Replies: 10
    • Views: 2,037
    05-21-2012, 04:28 PM Go to last post
  32. excel stat formula help

    launch temperature degrades aggregate reliability by 0.5% per degree below 55 degrees f, at what temperature would the go-nogo criteria of 0.950 be...

    Started by bobthebob‎, 07-19-2012 08:39 AM
    • Replies: 10
    • Views: 2,974
    07-20-2012, 07:05 AM Go to last post
  33. Kolmogorov-Smirnov Two Sample test statistic confusion

    Hi, What is the test statistic for the Kolmogorov Smirnov Two sample test for testing whether two distributions are the same. I have been using...

    Started by pring10‎, 09-05-2012 01:09 PM
    critical value, independent, kolmogorov, smirnov, two sample
    • Replies: 10
    • Views: 6,104
    09-05-2012, 02:00 PM Go to last post
  34. significant variables

    I am working on a problem and need to determine the stat. significant variables and provide an interpretation on sex? I got the following results...

    Started by Snowy88‎, 09-24-2012 11:24 AM
    • Replies: 10
    • Views: 2,223
    09-25-2012, 08:04 AM Go to last post
  35. Significance and multiple outcomes - are we guilty of a form of subgroup analysis?

    In a piece of previous research we wanted to see if there was evidence that peoples' ability to perform CPR declined with time. To test this we made...

    Started by DrDogg‎, 10-03-2012 09:13 AM
    • Replies: 10
    • Views: 2,582
    10-04-2012, 12:24 PM Go to last post
  36. Regression Coefficient Help

    Hello, Thanks in advance for the help everyone, I'm new to this site and I really appreciate it. I am currently working on some research and...

    Started by husky‎, 12-07-2012 06:14 AM
    analysis help, coefficient, regression
    • Replies: 10
    • Views: 2,192
    12-07-2012, 01:40 PM Go to last post
  37. How do you do an F-test for R-square

    Hi, How do you do an F-test to test significance of R-square in EXCEL? I have done a linear regression and get R-square = 0.412, how can I test if...

    Started by LizR‎, 01-17-2013 08:07 AM
    • Replies: 10
    • Views: 32,427
    01-23-2013, 08:58 AM Go to last post
  38. ANOVA with percentages

    Hello -- I'm looking for some guidance on how to make my percentage data appropriate for ANOVA. Here is what I have: The dependent variable is a...

    Started by marika‎, 01-11-2013 02:44 PM
    • Replies: 10
    • Views: 11,976
    01-13-2013, 02:20 PM Go to last post
  39. 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: 9,952
    03-17-2013, 03:46 AM Go to last post
  40. probit vs. logit regression

    What is the difference between PROBIT and LOGIT regression? How can this difference change the description of analysis results?

    Started by yulia‎, 02-19-2013 03:22 PM
    • Replies: 10
    • Views: 6,617
    02-19-2013, 08:36 PM Go to last post
  41. Question Relationship between Two Varibles: Finding the Covariance, Correlation, and IQR

    Eight randomly selected students who completed a course in Statistics were asked (1) the number of months between when they finished Algebra and...

    Started by reilyn‎, 01-26-2013 04:51 PM
    • Replies: 10
    • Views: 2,134
    01-26-2013, 07:38 PM Go to last post
  42. GW shark study- You give advice on the stats and I give advice on swim spots ;)

    Disclaimer: I am fairly new to the stats side of Ecology, I have carried out a bit of field work in my time but have only come over to the analysis...

    Started by Clem‎, 05-06-2013 04:45 AM
    anova ecology biology
    • Replies: 10
    • Views: 1,851
    05-28-2013, 01:35 AM Go to last post
  43. What Test to Use to Compare Groups

    I'm looking through some data that I have collected from my patients over the past year and wanted to know what Statistical Test to use to see if a...

    Started by nmverma‎, 05-27-2013 08:01 PM
    equivalence testing, test of significance
    • Replies: 10
    • Views: 1,685
    05-28-2013, 03:35 AM Go to last post
  44. Statistical analysis question

    In my study I am looking at whether social class & race of a job applicant influence the applicant’s job promotion…so IV1 = social class of...

    Started by norajones‎, 06-18-2013 02:51 PM
    • Replies: 10
    • Views: 1,908
    06-20-2013, 03:46 PM Go to last post
  45. History & Development of Statistics....

    Hi, I have been given the task to write on the Topic: History & Development of Statistics. This task was given to me by my HOD(Head of Department...

    Started by Abhishek‎, 07-05-2013 08:39 AM
    • Replies: 10
    • Views: 2,131
    07-11-2013, 09:16 AM Go to last post
  46. Question Computing confidence for multivariant tests

    We'd like to compute an overall confidence value for a test with multiple variants (sometimes with no control). We've used Student's and Welch's...

    Started by ianmaddox‎, 08-15-2013 06:43 PM
    confidence, significance, t-test
    • Replies: 10
    • Views: 2,528
    08-28-2013, 07:47 AM Go to last post
  47. Help with variable

    I'm trying to input data into spss. The variable name is medication and I have coded them all by number, eg: 1=aspirin 2= warfarin 3=...

    Started by helpwithspss‎, 08-21-2013 10:37 AM
    • Replies: 10
    • Views: 4,516
    08-21-2013, 03:57 PM Go to last post
  48. Time Series Forecast in Excel with Dummy Variables

    I am trying to do this problem forecasting Whole Foods Sales. For some reason my forecast is off by 1 slope. I want to do the multiplicative with...

    Started by Ziggy‎, 11-15-2013 02:52 PM
    • Replies: 10
    • Views: 6,826
    11-16-2013, 06:19 PM Go to last post
  49. Red face Higher or Lower Powered studies???

    Trying to get me head around if a statistically significant result p<0.05 from a low powered study (20% power for a true relationship in a research...

    Started by Gisele‎, 09-17-2013 07:02 PM
    • Replies: 10
    • Views: 2,060
    09-19-2013, 08:01 PM Go to last post
  50. Exclamation Normal Distribution

    I cant figure out how to do this problem: I have 2 sets of means and 2 sets of SD 1sth graders scored a mean of 25 and a sd of 5 5th graders...

    Started by sceater‎, 09-25-2013 01:47 PM
    distribution, means, normal distribution, z-score
    • Replies: 10
    • Views: 1,525
    09-25-2013, 03:23 PM Go to last post
  51. The Silent Majority

    The Silent Majority is defined as any group of people who are not outspoken and who are considered to constitute a majority. I have searched high an...

    Started by Blueray123‎, 11-20-2013 05:00 PM
    majority, politics, polls
    • Replies: 10
    • Views: 2,284
    11-25-2013, 02:01 PM Go to last post
  52. Smile Polychoric correlation (assumptions)

    Hi, are there some assumptions for polychoric (tetrachoric) correlation estimation for 0/1 dichotomous variables (such as ratio of 0 and 1)? ...

    Started by Martin Marko‎, 11-20-2013 11:39 AM
    polychoric. assumption.
    • Replies: 10
    • Views: 3,289
    11-22-2013, 10:57 AM Go to last post
  53. Question Confidence interval says the opposite of my hypothesis test is true

    Good evening statmasters, I'm working on a problem regarding hypothesis testing. The hypothesis is as follows: drinking .5cm^3 of whiskey per...

    Started by brofession‎, 12-13-2013 12:02 AM
    • Replies: 10
    • Views: 1,756
    12-13-2013, 12:42 PM Go to last post
  54. Expectation and Variance of X^Y

    Dear Memebers, I have a function that is dependent on two random variables X, Y. I would like to calculate the Variance and Expectation of the...

    Started by write2rammy‎, 02-06-2014 11:36 AM
    • Replies: 10
    • Views: 1,711
    02-10-2014, 12:34 AM Go to last post
  55. normality tests

    Hi, I have a specific question that I need clarify. I need to test the normality of some variables, and I used a kolmogorov smirnov test. But the...

    Started by slavia‎, 02-13-2014 12:48 PM
    • Replies: 10
    • Views: 2,133
    03-03-2014, 08:54 PM Go to last post
  56. plesae help me in this questions.

    These data are crime-related and demographic statistics for 47 US states in 1960. The data were collected from the FBI's Uniform Crime Report and...

    Started by numerospy‎, 03-02-2014 12:58 PM
    • Replies: 10
    • Views: 2,450
    03-13-2014, 05:10 AM Go to last post
  57. Very significant findings - but how do I show that? What's a binomial choice?

    Hi all, I'm writing a paper based on one which uses 'binomial choice'. I can't seem to find this in textbooks, what's the most common name for it?...

    Started by QueenOfStats‎, 03-21-2014 07:39 AM
    • Replies: 10
    • Views: 1,259
    03-23-2014, 08:42 AM Go to last post
  58. Trouble with determining the probability of exceding some extreme value

    I fitted a normal distribution to my dataset of N=200 lengths. The chi-square test shows it's a pretty good match. I intended to use this normal...

    Started by maq‎, 04-07-2014 09:38 AM
    • Replies: 10
    • Views: 1,524
    04-10-2014, 12:10 PM Go to last post
  59. Cohens D and Statistical Significance

    I've read that a low scoring Cohens D can be seen to undermine a significant result, however is the opposite true? Can a high Cohens D undermine a...

    Started by bataille‎, 04-15-2014 02:21 PM
    • Replies: 10
    • Views: 3,087
    04-16-2014, 01:44 PM Go to last post
  60. Statement of significance

    Is saying that β1= β2=….= β11=0 (ie: through an F-test) equivalent to saying that "none of the coefficients are significant" (p>0.05 in the STATA...

    Started by ineedhelpineedhelp‎, 04-19-2014 12:07 PM
    • Replies: 10
    • Views: 2,258
    04-23-2014, 01:39 PM Go to last post

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