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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: 66,868
    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: 196,982
    07-16-2014, 11:01 AM Go to last post
  1. Checking solutions

    Hey I have been working on an assignement but I am pretty lost with it all. I have attatched it and the answers I have so far, any feedback or hints...

    Started by Taka‎, 05-23-2006 11:05 PM
    • Replies: 0
    • Views: 2,199
    05-23-2006, 11:05 PM Go to last post
  2. Question Analysis of three difference samples

    Hi there, I have surveyed three separate populations frome which I have obtained fairly representative samples. One was a stratified sample (as...

    Started by max‎, 05-24-2006 04:30 AM
    • Replies: 0
    • Views: 1,928
    05-24-2006, 04:30 AM Go to last post
  3. Question about multivariate regression results

    I'm a PhD candidate working with my dissertation data in organizational theory. I'm having trouble understanding my data results and have a few...

    Started by phd-cand‎, 05-24-2006 01:45 PM
    • Replies: 0
    • Views: 2,509
    05-24-2006, 01:45 PM Go to last post
  4. transformations of explanatory variable

    If you look at the residuals for some response variable y regressed on some explanatory variable x and you see some pattern, e.g. the residuals seem...

    Started by macro90‎, 05-28-2006 12:55 AM
    • Replies: 0
    • Views: 3,302
    05-28-2006, 12:55 AM Go to last post
  5. Confused on Exponential PDF

    Hi, I am a bit confused on the Exponential prob density function. I am clear on a simple problem involving a poisson arrival mechanism and how to...

    Started by zuludogm‎, 05-28-2006 04:13 AM
    • Replies: 0
    • Views: 1,866
    05-28-2006, 04:13 AM Go to last post
  6. Hypothesis Testing Problem

    Hi again. I have a quick question regarding hypothesis testing. Below is the question that I'm working on: On a national standardized reading...

    Started by Mira‎, 05-26-2006 06:33 PM
    • Replies: 3
    • Views: 7,110
    05-29-2006, 09:13 AM Go to last post
  7. Question Confused on Exponential PDF

    Hi, I am a bit confused on the Exponential prob density function. I am clear on a simple problem involving a poisson arrival mechanism and how to...

    Started by zuludogm‎, 05-30-2006 01:07 AM
    • Replies: 0
    • Views: 2,010
    05-30-2006, 01:07 AM Go to last post
  8. Large Sample Tests

    I need help with this question. Can anyone help explain how the answers below were obtained. Thanks in advance. The frequency distribution of...

    Started by skhan‎, 05-30-2006 01:47 PM
    • Replies: 0
    • Views: 2,522
    05-30-2006, 01:47 PM Go to last post
  9. Confidence Intervals

    Hello. Can someone explain to me the factors that affect the width of confidence intervals? I know that N size affects it, but what about the...

    Started by kique‎, 05-30-2006 03:35 PM
    • Replies: 0
    • Views: 2,990
    05-30-2006, 03:35 PM Go to last post
  10. hmwk problem - need help

    One day, it suddenly occurs to you that students at Western seem to be taller than the national average, which you know to be 66 inches. To test your...

    Started by aptiva‎, 05-30-2006 01:55 PM
    • Replies: 1
    • Views: 1,633
    05-31-2006, 12:10 PM Go to last post
  11. Question 2 Problems - HELP!!!

    :confused: new to this whole stats thing , and ive been going over these 2 questions for ages and cant come to a conclusion , someone plz help ,...

    Started by Echoesofreason‎, 06-02-2006 03:13 AM
    • Replies: 0
    • Views: 2,371
    06-02-2006, 03:13 AM Go to last post
  12. Coefficients Intervals

    Hello people, I need ideas about this question: let x1,x2,...,xn be a random sample: x1,x2,...,xn ~ N(myu, sigma^2) ( myu is known ) and let...

    Started by WeeG‎, 06-02-2006 03:56 PM
    • Replies: 0
    • Views: 1,650
    06-02-2006, 03:56 PM Go to last post
  13. Data Transformations

    Hi, I've attached an image of my data. Measured is the percentage of fry that hatch from a clutch of eggs. My data that range from zero to 100%...

    Started by James Jukosky‎, 05-31-2006 12:14 PM
    • Replies: 3
    • Views: 5,355
    06-02-2006, 10:10 PM Go to last post
  14. Question division problem

    Pourpose: I need the solution for a problem in my B. tech project. Hi all, I have 'n' numbers between 0 and 1 .... and there sum 'S' is known...

    Started by lunatic11‎, 06-05-2006 01:45 AM
    • Replies: 0
    • Views: 2,264
    06-05-2006, 01:45 AM Go to last post
  15. Question Z Vlaue Formula

    Hello: I am currently working on a homework assignment. I have done most of the work, but I need some proofread. Are my z values correct? Do I...

    Started by lovetoreadXYZ‎, 06-02-2006 12:13 PM
    • Replies: 2
    • Views: 3,592
    06-06-2006, 12:08 PM Go to last post
  16. Need help with manova

    Can someone please explain what a manova is and give an example of 2x3 design? Also, would a study comparing anxiety and depression (2 dependent...

    Started by efrantz‎, 06-06-2006 08:39 PM
    • Replies: 0
    • Views: 2,574
    06-06-2006, 08:39 PM Go to last post
  17. Question confidence interval

    I have a project that i have to present to the class before our teacher teaches the material, and hopefully someone can help me out. You surveyed...

    Started by Shirlaw‎, 06-05-2006 05:57 PM
    • Replies: 1
    • Views: 2,971
    06-06-2006, 11:02 PM Go to last post
  18. factor analysis of single item variables possible?

    Hi everyone, I am extremely rusty in my stats know-how. Is it possible to correctly interpret a factor analysis of variables that are each...

    Started by fbarbie‎, 06-10-2006 11:36 PM
    • Replies: 0
    • Views: 4,248
    06-10-2006, 11:36 PM Go to last post
  19. Solve for Z

    Hi all, I cant get my head around how to rearange this formula so as to solve for z. Can someone help please? A set by step would be good not...

    Started by Peter.Spence‎, 06-11-2006 03:03 AM
    • Replies: 0
    • Views: 2,244
    06-11-2006, 03:03 AM Go to last post
  20. Need to clarify something

    I wanted to do a project on ethnicity in the different states of the U.S. Like whether one ethnicity prefers to go towards a certain region more. I...

    Started by xiem‎, 06-11-2006 06:12 AM
    • Replies: 0
    • Views: 1,949
    06-11-2006, 06:12 AM Go to last post
  21. Question Interaction Effect Test Methods

    Hie, i would like to test interaction effect for my moderator variable (personality type - in total 9 types) on the independent variables (stressors...

    Started by Nee‎, 06-12-2006 01:15 PM
    • Replies: 0
    • Views: 2,743
    06-12-2006, 01:15 PM Go to last post
  22. Regression

    hi people, I have an exam coming in a couple of weeks and I am stuck with this one....: let y=b0+b1x+E a linear regression model. the linear...

    Started by WeeG‎, 06-12-2006 03:39 PM
    • Replies: 0
    • Views: 1,966
    06-12-2006, 03:39 PM Go to last post
  23. p-value help

    Hi there. I need help with a question assigned to me about p-values. The problem is: A company advertises that its fuel additive will improve gas...

    Started by natalie‎, 06-11-2006 10:43 PM
    • Replies: 1
    • Views: 1,780
    06-12-2006, 11:23 PM Go to last post
  24. question about surveys for conservation program?

    Hello, I am running a survey for a marine conservation program an was hoping to get some help on how to analyse the results. I am running a marine...

    Started by awals‎, 06-13-2006 04:56 AM
    • Replies: 0
    • Views: 1,883
    06-13-2006, 04:56 AM Go to last post
  25. Hypothesis testing w/ equality of variances F distribution

    For example when we have a equality of variances (with the F DISTRIBUTION), against a 2 sided test, H: O^2=O^2 against that the variances that are...

    Started by Michelle‎, 06-13-2006 03:34 PM
    • Replies: 0
    • Views: 2,695
    06-13-2006, 03:34 PM Go to last post
  26. Stats dummy needs help!!

    I am wanting to prove an objective that an event happened near 100%. I have a random sample of 60. Total population is 1,000. Any help would...

    Started by stephj37‎, 06-13-2006 03:47 PM
    • Replies: 0
    • Views: 1,972
    06-13-2006, 03:47 PM Go to last post
  27. I'm so lost on population variances!!

    Hello, Suppose a company is making a product. They want a maximum variance of .0001 inches. Assume a sample size of 15 products has a standard...

    Started by half-life‎, 06-13-2006 08:55 PM
    • Replies: 0
    • Views: 1,920
    06-13-2006, 08:55 PM Go to last post
  28. Reliability analysis

    Hi, i have a test with only 5 dichotomous items. the test has been given to 25 people. Its avery easy test with the mean of 4.32 out of 5 and...

    Started by Humphrey‎, 06-14-2006 11:07 AM
    • Replies: 0
    • Views: 4,362
    06-14-2006, 11:07 AM Go to last post
  29. Red face Basic stats!!!

    Hi there, I need some advice on simple stats which I am taking up again (after ten years!) in the context of a study that involves a test...

    Started by nikoleye‎, 06-10-2006 02:01 PM
    • Replies: 4
    • Views: 3,456
    06-14-2006, 10:56 PM Go to last post
  30. MGF and Maximum Likelihood Estimation - need help!

    Hi all, I'm new to the forums and delighted to have discovered this website! I am currently studying for a Higher Certificate in Statistics and...

    Started by pixels‎, 06-15-2006 03:37 PM
    • Replies: 1
    • Views: 3,176
    06-15-2006, 11:57 PM Go to last post
  31. Question Analysis of Variance-F Distribution

    The FIRST problem I am having is plugging in the right numbers into the formula. I have an attachment of the problem because I cannot paste directly...

    Started by lovetoreadXYZ‎, 06-14-2006 02:56 PM
    • Replies: 4
    • Views: 3,813
    06-16-2006, 10:07 PM Go to last post
  32. Regression question

    If I have two IV's, A and B and a third IV, C which is the sum of A and B - in general is fitting C equivalent to fitting A and B? For a set of...

    Started by mishery‎, 06-19-2006 10:48 AM
    • Replies: 0
    • Views: 2,321
    06-19-2006, 10:48 AM Go to last post
  33. Question Non-parametric analysis question - please help!

    Hi. Cool forum btw - just what I need! :) I have agonised over this for while. I have two lots of questionnaire data - for one study this is...

    Started by alias grace‎, 06-08-2006 07:07 AM
    • Replies: 9
    • Views: 3,412
    06-19-2006, 10:07 PM Go to last post
  34. Random effects results using LME in R

    Hi. Anyone know how to interpret the Random Effects results below I get from a LME analysis using the R stats package? Thanks...

    Started by mishery‎, 06-21-2006 10:54 AM
    • Replies: 0
    • Views: 3,508
    06-21-2006, 10:54 AM Go to last post
  35. Test to use for series comparison

    I have a silly example to illustrate something that I am looking into, but I don't want to give up what I'm after just yet. So indulge the stupidity...

    Started by ParadiseIsle‎, 06-21-2006 02:17 PM
    • Replies: 0
    • Views: 2,437
    06-21-2006, 02:17 PM Go to last post
  36. Nonparametric tests to support parametric tests

    hi people, i am new here so excuse my 'innocence' in statistics. I was wondering if someone could tell me if i am on the right track. In my...

    Started by Joseph‎, 06-20-2006 05:24 AM
    • Replies: 3
    • Views: 7,569
    06-21-2006, 11:00 PM Go to last post
  37. Smile randam variable problem

    please help me in this question. ********************************************************* Let W be a random variable giving the number of heads...

    Started by h669‎, 06-22-2006 06:46 AM
    • Replies: 0
    • Views: 3,783
    06-22-2006, 06:46 AM Go to last post
  38. Exclamation Regression: When the intercept is zero.

    Hi, When the intercept is zero y= bx + e How do i plot the value of sum of squares function for enough values of the sllope parameter in the...

    Started by Michelle‎, 06-24-2006 08:25 PM
    • Replies: 0
    • Views: 4,365
    06-24-2006, 08:25 PM Go to last post
  39. parametric vs non-parametric 4 beginners

    Hi. Hopefully simple analysis that I've been staring at for so long I've forgotten the basics. Masters research in medicine. 28 patients, each...

    Started by CK1‎, 06-23-2006 06:56 AM
    • Replies: 1
    • Views: 2,971
    06-24-2006, 10:53 PM Go to last post
  40. Not the standard Power Calculation for Regressions?

    With 3 predictors, 120 items and total R^2 of 0.48, my analysis has adequate power using the standard power calculation that uses effect size, sample...

    Started by mishery‎, 06-26-2006 04:16 AM
    • Replies: 0
    • Views: 2,172
    06-26-2006, 04:16 AM Go to last post
  41. Validity

    :confused: Ok, I hope you guys can help me again. Last time you were a BIG help. I feel like this is a stupid question, but I am just not getting...

    Started by MLS‎, 06-22-2006 02:49 PM
    • Replies: 2
    • Views: 3,853
    06-26-2006, 10:37 AM Go to last post
  42. completely randomized ANOVA

    Forty eight subjects were randomly assigned to one of 4 treatment conditions in a study of different methods of coping with statistics exam anxiety....

    Started by skhan‎, 06-14-2006 02:24 PM
    • Replies: 1
    • Views: 3,317
    06-26-2006, 03:04 PM Go to last post
  43. Linear Regression

    hello, I need a help understanding what to do here: let the linear model be: y=b0+b1x+w ( b0 and b1 refers to beta0 and beta1, while w...

    Started by WeeG‎, 06-16-2006 11:38 AM
    • Replies: 1
    • Views: 2,640
    06-26-2006, 03:16 PM Go to last post
  44. adjusted residuals or standardized residuals?

    Hi, I am performing chi-square analyses for my dissertation data and am wondering about appropriate "post-hoc" analyses when chi-square values are...

    Started by rydingray‎, 06-21-2006 09:19 AM
    • Replies: 2
    • Views: 15,136
    06-27-2006, 03:58 PM Go to last post
  45. Simplifying variance and standard deviation formulas

    I am having a problem figuring how to simplify the std variation formula and variance formula. I need to figure what I would use in place of X, in a...

    Started by phly32‎, 06-16-2006 03:48 PM
    • Replies: 1
    • Views: 11,529
    06-28-2006, 04:52 PM Go to last post
  46. Likert scale testing

    I've got a likert scale: 1 2 3 4 5 I want to proof that a significant amount of respondents filled out 3 > How do I test this? I know how...

    Started by Noscito‎, 06-28-2006 05:37 PM
    • Replies: 0
    • Views: 2,843
    06-28-2006, 05:37 PM Go to last post
  47. Gray Paths in LISREL

    Hi all, I'm wondering if anyone can tell me what the gray paths mean in LISREL. I've looked and looked, and I can't find an answer! No matter...

    Started by BTings‎, 06-25-2006 02:33 PM
    • Replies: 1
    • Views: 2,441
    06-28-2006, 05:41 PM Go to last post
  48. Am I doing this ANOVA right?

    Hi, although I am doing graduate work I am totally new to stats and its doing my head in! Please try to answer in plain english! I am planning...

    Started by xanderd‎, 06-29-2006 07:53 AM
    • Replies: 1
    • Views: 1,718
    06-29-2006, 05:23 PM Go to last post
  49. Unhappy mean & std deviation

    I am getting lost on this for some reason, Heres the problem: Find the mean and standard deviation of the given frequency table: Age...

    Started by sbicu‎, 06-29-2006 03:57 PM
    • Replies: 3
    • Views: 2,307
    06-30-2006, 10:31 PM Go to last post
  50. hierarchical regression

    Hi all. I hope someone can help me because stats is definitely not my thing. I am trying to analyze some of my data for a paper and am a little...

    Started by phd2be‎, 07-01-2006 12:40 PM
    • Replies: 3
    • Views: 4,046
    07-05-2006, 10:46 AM Go to last post
  51. Sample Standard Deviation

    I was given a population standard deviation but i need to find the sample standard deviation from it. My mean is 12 My st. dev is .11 My sample...

    Started by kali2729‎, 07-05-2006 02:01 PM
    • Replies: 0
    • Views: 3,663
    07-05-2006, 02:01 PM Go to last post
  52. Unhappy .05 level of significance?!!!

    can someone please help me out? i just need the formula. i have no idea how to even start this problem! =( once i can figure out values for X then i...

    Started by michelecm‎, 07-06-2006 02:12 PM
    • Replies: 0
    • Views: 7,042
    07-06-2006, 02:12 PM Go to last post
  53. Help!!!!!!

    I have been trying to figure out these problems all week and the assignment is due tomorrow! I went to the on campus tutoring center and they...

    Started by citlalmina‎, 07-06-2006 07:58 PM
    • Replies: 0
    • Views: 2,322
    07-06-2006, 07:58 PM Go to last post
  54. Residuals

    I am working on Chapter 5 of my dissertation, and I want to make sure that I am right about this. My questions concerns residuals in my crosstab...

    Started by jeaninevdv‎, 07-07-2006 01:15 PM
    • Replies: 0
    • Views: 4,331
    07-07-2006, 01:15 PM Go to last post
  55. Residuals

    I am working on Chapter 5 of my dissertation, and I want to make sure that I am right about this. My questions concerns residuals in my crosstab...

    Started by jeaninevdv‎, 07-07-2006 01:30 PM
    • Replies: 0
    • Views: 3,140
    07-07-2006, 01:30 PM Go to last post
  56. parametric or non parametric?

    Hi, I need a help. # 1 I tested the two same product but different brand for normality and i found out that the one is normal and the other...

    Started by riza_esmilla‎, 07-08-2006 09:58 AM
    • Replies: 0
    • Views: 1,972
    07-08-2006, 09:58 AM Go to last post
  57. Homework Help

    I need help with the following problem. Find a value so that ( z > - 1.00 ) and 15 % of the area under the standard curve. If the normal...

    Started by dworla‎, 07-08-2006 03:04 PM
    • Replies: 0
    • Views: 2,247
    07-08-2006, 03:04 PM Go to last post
  58. Help Pls

    a production line is considered "out of control" when its hourly output falls more than two standard deviations below the mean hourly output for the...

    Started by zena‎, 07-09-2006 03:35 PM
    • Replies: 0
    • Views: 1,945
    07-09-2006, 03:35 PM Go to last post
  59. help

    the following table states the median price of new, privatley owned , single-family houses sold last year: overall $112,500 Region A $149000 ...

    Started by zena‎, 07-09-2006 03:49 PM
    • Replies: 0
    • Views: 1,994
    07-09-2006, 03:49 PM Go to last post
  60. how to analyze born dead data

    My question is basically how to analyze data that is not normally distributed not satisfies assumption of homogenous variance. Data looks kinda of...

    Started by ron‎, 07-09-2006 07:50 PM
    • Replies: 0
    • Views: 2,007
    07-09-2006, 07:50 PM Go to last post

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