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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: 66,703
    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: 196,679
    07-16-2014, 11:01 AM Go to last post
  1. simple returns / autogressive model

    Hello, I have a problem with solving this statistical matter. The file aexdaily(1) consists a couple of data, the closing prices (workdays) of...

    Started by e. cools‎, 01-06-2006 05:45 AM
    • Replies: 0
    • Views: 2,697
    01-06-2006, 05:45 AM Go to last post
  2. random effects model (ANOVA)

    hello there, I am struggling with the following question: "show that the error SS, for the random effects model, is the same...

    Started by beast‎, 02-21-2006 06:35 AM
    • Replies: 0
    • Views: 3,350
    02-21-2006, 06:35 AM Go to last post
  3. Post Help

    Need help Im lost on this one, it was suppose to be a group project but I cannot get them to respond. I have uploaded a file to go into more detail...

    Started by mcafeep‎, 03-02-2006 11:00 AM
    • Replies: 0
    • Views: 1,922
    03-02-2006, 11:00 AM Go to last post
  4. Explaining this example... (minimising variance)

    Hi, i'm just wondering if someone could give me an explanation as to whats going on in this example. I don't understand why the values for E(X) and...

    Started by Mutant_Fruit‎, 03-05-2006 05:41 PM
    • Replies: 0
    • Views: 2,568
    03-05-2006, 05:41 PM Go to last post
  5. unequal and unknown variances

    Hi, We have a question on our homework that asks us to discuss the difficulty with unknown and unequal variances with respect to a t-distribution. I...

    Started by tidus‎, 03-08-2006 06:44 PM
    • Replies: 0
    • Views: 2,605
    03-08-2006, 06:44 PM Go to last post
  6. Stats Report

    I have to write a 500 word stats report on the following data: Batch 1 Batch 2 Min Value 26.1 26.1 Q1 29.6 28.4 Median 31.2 30.3...

    Started by LindaM‎, 03-12-2006 07:45 PM
    • Replies: 0
    • Views: 2,153
    03-12-2006, 07:45 PM Go to last post
  7. Smile Principal Component Analysis

    Are the sample variances of principal components always positively biased compared to population variances? I know that the first principal component...

    Started by Arora‎, 03-15-2006 06:53 AM
    • Replies: 0
    • Views: 3,585
    03-15-2006, 06:53 AM Go to last post
  8. Calculating a binomial probability

    Hello, I have a distribution of observed B values that vary with x. I am fitting a distribution to this and do not have a problem with this. ...

    Started by FailedStats101‎, 03-17-2006 07:20 AM
    • Replies: 0
    • Views: 2,410
    03-17-2006, 07:20 AM Go to last post
  9. estimate/probability

    With this information: Within the state,about 10.47% of faculty members serve as admin. or receive admin. salary supplements. Female with admin...

    Started by rgentil32‎, 03-19-2006 03:22 PM
    • Replies: 0
    • Views: 1,803
    03-19-2006, 03:22 PM Go to last post
  10. Can propensities and percentages be compared?

    Hi, I'm new to the world of statistical modelling and have recently have been given a model to update. The model currently assigns a propensity...

    Started by aselldurn‎, 03-19-2006 07:25 PM
    • Replies: 0
    • Views: 2,004
    03-19-2006, 07:25 PM Go to last post
  11. one sample z test

    Ho=mu(males)=mu(state prop.) Ha=mu(males)<>mu(state prop.) The critical Z-values for .05 is 1.96 and .01 is 2.57, respectively. State-10.47...

    Started by rgentil32‎, 03-21-2006 04:14 PM
    • Replies: 0
    • Views: 1,816
    03-21-2006, 04:14 PM Go to last post
  12. one sample z test

    Ho=mu(males)=mu(state prop.) Ha=mu(males)<>mu(state prop.) The critical Z-values for .05 is 1.96 and .01 is 2.57, respectively. State-10.47...

    Started by rgentil32‎, 03-21-2006 04:16 PM
    • Replies: 0
    • Views: 1,971
    03-21-2006, 04:16 PM Go to last post
  13. F test

    With this information: F-Test Two-Sample for Variances 1 0 Mean 43.4333871 48.65021053 Variance 95.63978493 159.8278372...

    Started by rgentil32‎, 03-26-2006 10:48 AM
    • Replies: 0
    • Views: 1,749
    03-26-2006, 10:48 AM Go to last post
  14. Help with almonds!!!

    hey guys i am new here and am having trouble with this problem... Consider the market for almonds. Assume that quantity supplied is a linear...

    Started by Crisco‎, 03-26-2006 09:11 PM
    • Replies: 0
    • Views: 1,736
    03-26-2006, 09:11 PM Go to last post
  15. Cochran-Armitage Trend Test

    Hello. I have a question on interpreting the results of a Cochran-Armitage Trend Test. I ran the data below in SAS to see if the NH-Black...

    Started by kique‎, 03-28-2006 04:19 PM
    • Replies: 0
    • Views: 5,186
    03-28-2006, 04:19 PM Go to last post
  16. helpz!

    1) a car insurance company has determined that 8% of all ddrivers were involved in a car accident last year. among the 15 drivers living on one...

    Started by HemlyFan‎, 03-29-2006 02:27 AM
    • Replies: 0
    • Views: 4,961
    03-29-2006, 02:27 AM Go to last post
  17. 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
  18. Help With Normal Distribution

    When I am given a problem asking to find the lowest vaule in the top 20% of the test scores i can, but I didnt know if I was doing it right to find...

    Started by chivon101‎, 04-01-2006 05:36 PM
    • Replies: 0
    • Views: 1,856
    04-01-2006, 05:36 PM Go to last post
  19. P-value method

    I have a couple of questions I would like to know if I am doing them correctly or not, any guidence would be greatly appreciated. Test the given...

    Started by hannao1‎, 04-02-2006 10:25 PM
    • Replies: 0
    • Views: 5,928
    04-02-2006, 10:25 PM Go to last post
  20. Angry Need Help Urgently

    Hey guys I need help in an assignment it is due tonight, and i am clueless about what to do the assignment is here...

    Started by nokidding‎, 04-06-2006 01:39 PM
    • Replies: 0
    • Views: 2,124
    04-06-2006, 01:39 PM Go to last post
  21. Exclamation Post Hoc tests - significant interaction

    I'm involved in a student project that is investigating the effects of anticipation on the magnitude of the reflex muscle activity in the arm. I have...

    Started by CraigMc‎, 04-06-2006 03:11 PM
    • Replies: 0
    • Views: 2,325
    04-06-2006, 03:11 PM Go to last post
  22. Normal Distributions

    ok, I have this one problem that I cannot figure out for the life of me. It's probably really simple, but I really just can't figure it out. Any...

    Started by AcidicBassist‎, 04-03-2006 11:35 PM
    • Replies: 0
    • Views: 2,828
    04-03-2006, 11:35 PM Go to last post
  23. Question Can't seem to figure this out... any help?

    "A shopping center developer claims in a presentation to a potential client that at least 40% of the adult female population in a community visit the...

    Started by wbh1‎, 04-04-2006 01:51 PM
    • Replies: 0
    • Views: 2,097
    04-04-2006, 01:51 PM Go to last post
  24. Please check homework problem #2

    :confused: Coaching and the SAT. Suppose that SAT mathematics scores in the absence of coaching vary Normally with mean mule=475 and standard...

    Started by grays‎, 04-04-2006 03:25 PM
    • Replies: 0
    • Views: 4,137
    04-04-2006, 03:25 PM Go to last post
  25. Example Questions for a Final

    Do you have any example questions for a comprehensive final? If, so please e-mail them my final is on May 8, 06. Thanks in advance Shonna

    Started by grays‎, 04-04-2006 03:45 PM
    • Replies: 0
    • Views: 1,980
    04-04-2006, 03:45 PM Go to last post
  26. Need help with hypothesis testing problems

    Microsoft believes that if over 30% of Linux users would be interested in a particular new software package, then the company will make at least an...

    Started by securitygeek‎, 04-19-2006 02:36 PM
    • Replies: 0
    • Views: 2,111
    04-19-2006, 02:36 PM Go to last post
  27. How to convert a table of probabilities to j.p.d.f

    Among the sudent that attempted the exams of Calculus III (CIII) and Differential Equation (DE) is oberved that the joint probability of passing or...

    Started by -illuzion-b18c1‎, 04-19-2006 05:08 PM
    • Replies: 0
    • Views: 2,285
    04-19-2006, 05:08 PM Go to last post
  28. Question least regression

    I am a student taking basic stats and I am not sure if I arrived at the correct answer for these could someone please let me know. Consider the...

    Started by momof4‎, 04-19-2006 05:31 PM
    • Replies: 0
    • Views: 1,654
    04-19-2006, 05:31 PM Go to last post
  29. Confirmatory factor analysis

    Hi, does anyone here knows a good website that explains how to perform a confirmatory factor analysis with AMOS? Thank you, Hans

    Started by holiday‎, 04-23-2006 03:18 AM
    • Replies: 0
    • Views: 2,483
    04-23-2006, 03:18 AM Go to last post
  30. Smile least-squares prediction

    A sociologist beleives that there is a tendency for tall men to marry tall women. To determine the nature of such a relationship, the heights of the...

    Started by GeorgeBurns‎, 04-23-2006 01:41 PM
    • Replies: 0
    • Views: 2,704
    04-23-2006, 01:41 PM Go to last post
  31. Question FACTOR ANALYSIS - POOLING data from different samples

    I'm conducting an exploratory factor analysis to examine the factor structure of a translation of an established scale. There are 20 variables. I...

    Started by Binka‎, 04-26-2006 06:14 AM
    • Replies: 0
    • Views: 2,859
    04-26-2006, 06:14 AM Go to last post
  32. Confidence Int for shifted exp dist

    herez the q: Let random variable X has shifted exponential distribution with density function given as follows: F(x, t) = { L exp (-L (x - @))...

    Started by lunlo‎, 04-27-2006 08:13 PM
    • Replies: 0
    • Views: 1,950
    04-27-2006, 08:13 PM Go to last post
  33. Unhappy Kurtosis

    Hi! In LISREL, which values are we to use when discussing kurtosis, z-values or statistical values? Also, what are the difference between them? ...

    Started by Erlend‎, 05-09-2006 04:50 AM
    • Replies: 0
    • Views: 3,286
    05-09-2006, 04:50 AM Go to last post
  34. What test do I use?

    hi john i am trying to work out what inferential test i should use on my data. in brief my study involves looking at the effectiveness of a...

    Started by coleslaura‎, 05-13-2006 05:59 AM
    • Replies: 0
    • Views: 2,241
    05-13-2006, 05:59 AM Go to last post
  35. Red face median test or 2 sample kolmogorov test ?

    Hi I have the following problem: My data is generally non normal distributed and therefore I use the 2 sample Mann Whitney Test for comparisons. ...

    Started by sirhoppel‎, 05-13-2006 07:27 AM
    • Replies: 0
    • Views: 2,902
    05-13-2006, 07:27 AM Go to last post
  36. poisson distribution

    hello there, I've been staring at this question for quite some time now but to no avail :( "The discrete random variable X has a truncated...

    Started by beast‎, 05-21-2006 03:41 PM
    • Replies: 0
    • Views: 1,701
    05-21-2006, 03:41 PM Go to last post
  37. errors??

    hi there!!:wave: i have a question!im completely getting confused, what is the difference between error term, error variance, experimetal...

    Started by tele‎, 05-23-2006 02:44 PM
    • Replies: 0
    • Views: 2,003
    05-23-2006, 02:44 PM Go to last post
  38. 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: 2,192
    05-23-2006, 11:05 PM Go to last post
  39. 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: 1,920
    05-24-2006, 04:30 AM Go to last post
  40. 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: 2,499
    05-24-2006, 01:45 PM Go to last post
  41. 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: 3,291
    05-28-2006, 12:55 AM Go to last post
  42. 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: 1,853
    05-28-2006, 04:13 AM Go to last post
  43. 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: 1,997
    05-30-2006, 01:07 AM Go to last post
  44. 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: 2,516
    05-30-2006, 01:47 PM Go to last post
  45. 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: 2,964
    05-30-2006, 03:35 PM Go to last post
  46. 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: 2,360
    06-02-2006, 03:13 AM Go to last post
  47. 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: 1,640
    06-02-2006, 03:56 PM Go to last post
  48. 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: 2,236
    06-05-2006, 01:45 AM Go to last post
  49. 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: 2,565
    06-06-2006, 08:39 PM Go to last post
  50. 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: 4,222
    06-10-2006, 11:36 PM Go to last post
  51. 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: 2,223
    06-11-2006, 03:03 AM Go to last post
  52. 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: 1,941
    06-11-2006, 06:12 AM Go to last post
  53. 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: 2,718
    06-12-2006, 01:15 PM Go to last post
  54. 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: 1,945
    06-12-2006, 03:39 PM Go to last post
  55. 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: 1,880
    06-13-2006, 04:56 AM Go to last post
  56. 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: 2,668
    06-13-2006, 03:34 PM Go to last post
  57. 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: 1,962
    06-13-2006, 03:47 PM Go to last post
  58. 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: 1,908
    06-13-2006, 08:55 PM Go to last post
  59. 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: 4,351
    06-14-2006, 11:07 AM Go to last post
  60. 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: 2,309
    06-19-2006, 10:48 AM Go to last post

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