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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: 66,929
    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: 197,111
    07-16-2014, 11:01 AM Go to last post
  1. Allocating Items to a Limited Number of Slots

    Hi, Let's say that I have a small retail shop that has slots available for only 5 types of products. However, I also have a warehouse located...

    Started by sumantra‎, 01-06-2007 08:43 AM
    • Replies: 0
    • Views: 3,010
    01-06-2007, 08:43 AM Go to last post
  2. p.o. analysis on a b.subjs one way anova!

    Hi. I'm doing an undergraduate psychology project on how music affects pain. I have one factor (music) with 3 levels (preferred music, non-preferred...

    Started by damnsaiyan‎, 01-04-2007 04:58 PM
    • Replies: 4
    • Views: 5,228
    01-06-2007, 11:38 AM Go to last post
  3. Which Probabilty Formula?

    More than 200 billion grocery coupons are distributed each year for discounts exceeding $84 billion. However, according to a report in USA Today,...

    Started by Bishop‎, 12-31-2006 08:12 PM
    • Replies: 1
    • Views: 4,380
    01-06-2007, 12:27 PM Go to last post
  4. "Use the normal approximation to the binomial distribution" help if possible?

    Hello, i'm new here and i'm stuck on a question. This isn't really from my homework, as i'm just reviewing for my final which is in a week. The...

    Started by uns33n‎, 01-07-2007 12:25 AM
    • Replies: 1
    • Views: 6,005
    01-07-2007, 01:10 AM Go to last post
  5. Question Correlation question

    Hello! Suppose I have: class % persons % ill persons a 0% 0% b 0% 0% c 20% 20% d 40% 50% e 40% 30%

    Started by diodoo‎, 01-10-2007 09:29 AM
    • Replies: 0
    • Views: 2,114
    01-10-2007, 09:29 AM Go to last post
  6. Any R experts? Problem here

    OK, so I've looked and looked at the help on R, but I can't find a method for solving this. I have some electoral data, including the Polling...

    Started by naivesincerity‎, 01-10-2007 11:08 AM
    • Replies: 0
    • Views: 2,160
    01-10-2007, 11:08 AM Go to last post
  7. Repeated Measures vs Mixed Model

    HI I'm having trouble understanding the difference between using repeated measures and mixed model analysis. My variables are 2 x 2 x 2, however...

    Started by erica‎, 01-10-2007 04:28 PM
    • Replies: 0
    • Views: 3,674
    01-10-2007, 04:28 PM Go to last post
  8. I need help choosing stat method!

    Hi! I am hopelssly lost and I need help finding the suitable statistict to describe some resluts I have. I hope someone here can help me! I...

    Started by JennyL‎, 01-09-2007 08:19 AM
    • Replies: 1
    • Views: 1,999
    01-10-2007, 05:07 PM Go to last post
  9. Where's the independent variable? (survey)

    I have made a survey with a 5 point Likert scale. One section is about student perceptions of the advantages of Distance Learning. I have 10 items in...

    Started by ehb23‎, 01-10-2007 05:26 PM
    • Replies: 0
    • Views: 3,373
    01-10-2007, 05:26 PM Go to last post
  10. Poll Poll: Question about p-values

    "We report the results of a statistical test (alpha=.05, two-tailed) & provide an observed p-value: t(39)=2.343, p = .024. the p-value is: a) alpha...

    Started by cj2061‎, 01-08-2007 05:52 PM
    • Replies: 1
    • Views: 1,905
    01-10-2007, 05:30 PM Go to last post
  11. Significance of individual scores on t test

    Hi folks, I have a question. How do I determine the significance of individual scores from dependent t test results? I did a t test with a group...

    Started by Don‎, 01-09-2007 01:00 AM
    • Replies: 2
    • Views: 4,161
    01-10-2007, 08:18 PM Go to last post
  12. Repeated Measures ANCOVA

    Hello I am working with data which has a time varying covariate. Can anybody give inputs regarding the repeated measures ANCOVA and how it can be...

    Started by s_menon‎, 01-11-2007 11:28 PM
    • Replies: 0
    • Views: 3,756
    01-11-2007, 11:28 PM Go to last post
  13. Nonparametric test choice for skewed data

    Hello, My first thread on the board... I posted this to the SPSS-X list , but thought this forum may be more appropriate. I was wondering if...

    Started by n_knight‎, 03-05-2006 04:42 AM
    • Replies: 8
    • Views: 9,833
    01-12-2007, 04:05 PM Go to last post
  14. Unhappy Testing differences in variance - within subject

    I have a 3 (within) X 2 (between) design. For the within-subject aspect, is it possible to statistically compare the amount of variability in one...

    Started by mathisfun‎, 01-12-2007 04:28 PM
    • Replies: 0
    • Views: 3,163
    01-12-2007, 04:28 PM Go to last post
  15. Question skewness

    I am trying to find the existence of difference in achievement of boys and girls. I used Independent samples t-test but does it take care of the...

    Started by theanalyst‎, 01-13-2007 01:47 AM
    • Replies: 1
    • Views: 3,137
    01-13-2007, 09:18 AM Go to last post
  16. Durbin Watson

    Hi, I am new here and I am a second year university student studying economics. Any help here would be great and I thank-you in advance. I am...

    Started by Drazit‎, 01-12-2007 06:07 AM
    • Replies: 2
    • Views: 3,167
    01-13-2007, 09:57 AM Go to last post
  17. Survey Project I NEED HELP PLEASE Today

    Develop A Question to ask in a survey, determine the variables, determine the population, determine which type of sampling you will use, think of a...

    Started by rell_low‎, 01-15-2007 12:29 PM
    • Replies: 0
    • Views: 1,944
    01-15-2007, 12:29 PM Go to last post
  18. Likert Survey

    I have designed a Likert Survey (5 points) that pertains to classroom management. I am trying to analyze the classroom management style of high...

    Started by c1952l‎, 01-16-2007 10:59 AM
    • Replies: 0
    • Views: 3,261
    01-16-2007, 10:59 AM Go to last post
  19. Question Paired data or not...

    Hi I'm conducting an investigation into daily water use at an establishment before and after water saving devices were installed. We have...

    Started by enviroquestions‎, 01-16-2007 04:47 PM
    • Replies: 1
    • Views: 2,597
    01-16-2007, 05:42 PM Go to last post
  20. Statistics problems with genetic analysis

    hi everyone, I'm having a bit of trouble trying to find out what to do with some results I've got in my research project. I've found 2 different...

    Started by rodpck‎, 01-12-2007 01:42 PM
    • Replies: 1
    • Views: 2,558
    01-16-2007, 06:08 PM Go to last post
  21. circular statistics with weight?

    Hi all, I have a dataset that describes groups of 2-D linear features. Each group is a collection of angles (orientations) and lengths describing...

    Started by neta_wechsler‎, 01-10-2007 07:23 PM
    • Replies: 1
    • Views: 2,750
    01-16-2007, 06:20 PM Go to last post
  22. is Chi squared appropriate here?

    Hi, I have some survey results which I have compiled into a crosstabulation (9x4)using SPSS. I was intending to use chi squared analysis to...

    Started by snorkelsnot‎, 01-13-2007 11:02 PM
    • Replies: 3
    • Views: 2,149
    01-16-2007, 10:36 PM Go to last post
  23. Need help to this statistic question

    what are the criteria for a good measure of spread?

    Started by jekiebackie‎, 01-17-2007 12:53 AM
    • Replies: 0
    • Views: 2,678
    01-17-2007, 12:53 AM Go to last post
  24. ANOVA vs. t-test

    Dear Stats talkers, What's your answer to the question when to use a t-test vs. analysis of variance? Could you also give an example case for...

    Started by jaregi‎, 01-17-2007 06:16 AM
    • Replies: 2
    • Views: 6,882
    01-17-2007, 07:26 AM Go to last post
  25. Statistical analysis Survey advice Please

    Hi, I am an adult student struggling with the following: Background: A Survey of Analysts, who are used as representatives of investors in the...

    Started by ClayNZUK‎, 01-17-2007 10:21 AM
    • Replies: 1
    • Views: 3,508
    01-17-2007, 10:55 AM Go to last post
  26. sampling distribution

    i have been trying to do this for while, but couldnt figure out how. AUTO ACCIDENTS A study of rush hour traffic in San Francisco counts the...

    Started by annabananaa‎, 01-13-2007 07:54 PM
    • Replies: 3
    • Views: 9,679
    01-17-2007, 05:48 PM Go to last post
  27. To ANOVA or not to ANOVA

    That is the question. I am PhD student preparing my proposal for submittal this week, and I am still tossing around which data analysis method to...

    Started by gyebj‎, 01-17-2007 02:39 AM
    • Replies: 2
    • Views: 3,060
    01-17-2007, 07:37 PM Go to last post
  28. Cool Great data but not sure what to do with it?

    Hi- I've got 25 questions, each with 6 variables in each. I want to compare 2 groups (expert v novice) on each of these questions and within each...

    Started by lyn‎, 01-16-2007 10:17 AM
    • Replies: 4
    • Views: 2,607
    01-18-2007, 05:04 AM Go to last post
  29. testing my Pearson

    Hi there.. I just registered because I'm becoming desperate and I hope someone will know an answer to this one.. :) I'll make this more picturesque....

    Started by miracidij‎, 01-18-2007 06:43 AM
    • Replies: 0
    • Views: 2,668
    01-18-2007, 06:43 AM Go to last post
  30. clustrig

    Hai i am a pg student please explain the hirarical clustring-Aglomeritive methods thank you

    Started by ebyjoseph‎, 01-12-2007 05:37 AM
    • Replies: 1
    • Views: 2,826
    01-18-2007, 09:23 AM Go to last post
  31. Histograms

    Hi all, I'm trying to determine a cut-off for my data using a histogram - but my question is what is the correct way of setting bin sizes? ...

    Started by qstn‎, 01-18-2007 02:05 PM
    • Replies: 0
    • Views: 1,997
    01-18-2007, 02:05 PM Go to last post
  32. Which technique is best?

    Hi, i'm final year undergrad student and have been stuck for quite a while now. I have been provided with data on the girth measurements from 12...

    Started by Lajanke‎, 01-19-2007 12:08 AM
    • Replies: 0
    • Views: 2,370
    01-19-2007, 12:08 AM Go to last post
  33. Hierarchical Regression assumptions

    In my study, i would like to use hierachical regression, but I can't find a proper book on the assumptions that should be met. Is is true that the...

    Started by Noblesse‎, 01-17-2007 10:44 AM
    • Replies: 2
    • Views: 5,426
    01-19-2007, 04:36 AM Go to last post
  34. Unweighted and Weighted Data (Chi Square)

    Here's my situation: I have a dataset with unweighted data taken from a small, annual survey. I also have a large dataset with weighted and...

    Started by ambermrichardson‎, 01-19-2007 08:38 AM
    • Replies: 0
    • Views: 7,223
    01-19-2007, 08:38 AM Go to last post
  35. Sample Variance DISASTER

    :confused: I'm at my wits end i, for some reason, cannot at all get this formula in my text to work...PLEASE anyone who can help i need to...

    Started by MathInept‎, 01-21-2007 05:34 PM
    • Replies: 1
    • Views: 2,337
    01-21-2007, 05:58 PM Go to last post
  36. Multinomial problem

    I have five possible values (1-5) that are to be applied to categories regarding the likelihood, severity, etc, of systems problem events. There are...

    Started by vangogh228‎, 01-22-2007 09:53 AM
    • Replies: 0
    • Views: 2,014
    01-22-2007, 09:53 AM Go to last post
  37. solution

    does anyone know how to get hold of the solution manual for textbook "Engineering Statistics" 3rd edition by Montgomery

    Started by helpme‎, 01-24-2007 01:24 AM
    • Replies: 0
    • Views: 2,667
    01-24-2007, 01:24 AM Go to last post
  38. Classification of Insects (How to develop a method?)

    I've been trying this Moody's Mega Math Challenge sample problem, but I don't quite know where to begin. I only have experience in Statistics up to...

    Started by Staplerkid‎, 01-26-2007 03:41 PM
    • Replies: 0
    • Views: 2,655
    01-26-2007, 03:41 PM Go to last post
  39. cdf

    can anyone help me with a cdf question?

    Started by helpme‎, 01-24-2007 01:16 AM
    • Replies: 1
    • Views: 2,331
    01-27-2007, 01:32 AM Go to last post
  40. how to prove E(Σei^)=ΣE(yi^)-E(Σyihat^)

    this formula looks simple but i really don't know how to explain mathmatically E(Σei^)=ΣE(yi^)-E i tried putting E(Σei^)=E but then don;t know how...

    Started by azuresky‎, 01-26-2007 12:52 AM
    • Replies: 1
    • Views: 21,060
    01-27-2007, 02:17 AM Go to last post
  41. Unhappy Help please - in middle of brain me***own!!

    I am putting together a my research proposal on Chinese Herbs (as you can already see, statistics and I do not have much in common!). I have plowed...

    Started by Lavina‎, 01-20-2007 12:31 PM
    • Replies: 1
    • Views: 2,808
    01-27-2007, 09:28 AM Go to last post
  42. Awerage growth rate (3 years) - which method?

    Hello! I am intending to perform independent samples T Test, between two groups of companies in comparing average annual growth rate in years...

    Started by ynos‎, 01-21-2007 08:30 PM
    • Replies: 1
    • Views: 2,686
    01-27-2007, 06:02 PM Go to last post
  43. Multivariate Regressions

    I have temperature data from two different sites, and I want to develop a relationship for temperature between those two sites. In that way, if I...

    Started by mathias1979‎, 01-23-2007 03:15 PM
    • Replies: 1
    • Views: 2,259
    01-27-2007, 06:13 PM Go to last post
  44. to mix or not to mix?

    Hi, I am running a learning experiment in which both training subjects and controls complete a pretest and posttest. All analyses are being ...

    Started by dan‎, 01-24-2007 10:27 AM
    • Replies: 1
    • Views: 2,324
    01-27-2007, 06:27 PM Go to last post
  45. Help!

    Hi, I'm currently undergoing a project whereby I have approximately 1200 data cases. I have a number of independent variables and I would like to...

    Started by craigtomk‎, 01-24-2007 04:22 PM
    • Replies: 1
    • Views: 1,981
    01-27-2007, 06:30 PM Go to last post
  46. Exclamation Help With My Homework!

    I need help with a problem... I am trying to find the t* value by calculating the upper tail probability p I have 37 degrees of freedom and a...

    Started by ming_dynasty1369‎, 01-27-2007 10:07 PM
    • Replies: 2
    • Views: 4,548
    01-28-2007, 07:34 AM Go to last post
  47. hypothesis testing

    I need help learning this. I know how to come up with the null and alternative statements but i don't know how to determine which one is the the...

    Started by FB99‎, 01-28-2007 11:12 AM
    • Replies: 1
    • Views: 9,340
    01-28-2007, 11:24 AM Go to last post
  48. Confidence Interval Question

    I have to find a 90% confidence interval for a mean, and i'm only given the S and the x-bar for a sample population of 60. How do I find the t* for...

    Started by kyle86‎, 01-28-2007 02:03 PM
    • Replies: 1
    • Views: 4,220
    01-28-2007, 02:27 PM Go to last post
  49. Smile RARE EVENTS -- Poisson / Binomial -- Need Help

    Any help with the problem below is greatly appreciated. :wave: I have 100 days of observations of a geyser. In those 100 days, the geyser shot...

    Started by jchen123456789‎, 01-27-2007 04:30 PM
    • Replies: 2
    • Views: 3,258
    01-28-2007, 02:57 PM Go to last post
  50. Help with question

    The Food and Nutrition Board of National Acadamy of Sciences states that reccomended daily allowance (RDA) of iron for adult females under the age of...

    Started by kyle86‎, 01-28-2007 02:07 PM
    • Replies: 1
    • Views: 2,355
    01-28-2007, 03:27 PM Go to last post
  51. Approximating the mean and standard deviation

    Hi, I just started my statistics class and I've been having a little trouple grasping it. I just don't know where to start with this and my book is...

    Started by recipient‎, 01-28-2007 04:34 PM
    • Replies: 0
    • Views: 5,448
    01-28-2007, 04:34 PM Go to last post
  52. urgent help needed with assignment

    Hi guys I am in urgent need of some help with a question for an assignment due in a few hours. It involves using minitab. It goes as follows: ...

    Started by stephen_patt‎, 01-28-2007 04:43 PM
    • Replies: 1
    • Views: 2,931
    01-28-2007, 05:01 PM Go to last post
  53. Question ramdomness of two independent samples

    Hello! Ive two small and independent samples and i need to confirm that they are random (one of the assumptions on the mann-whitney test), the only...

    Started by Marga‎, 01-19-2007 04:02 PM
    • Replies: 2
    • Views: 1,927
    01-28-2007, 05:42 PM Go to last post
  54. Parametric or Non-parametric Analysis with z-scores?

    I last took a stats course in 1999, and I could use some help in remember options available for an analysis of z-scores. I have z-scores on 4...

    Started by colorfulbouquet‎, 01-28-2007 09:58 PM
    • Replies: 0
    • Views: 5,110
    01-28-2007, 09:58 PM Go to last post
  55. Linear vs. Quadratic in Comparisons - Why?

    Hello, I have a set of data for the level of antioxidants in tea, with two variables (water temperature of either 70 or 90 degrees, and steeping...

    Started by junglerat2‎, 01-21-2007 12:28 AM
    • Replies: 2
    • Views: 11,056
    01-29-2007, 09:16 PM Go to last post
  56. Significance

    Hello, I am very happy to have found this disucssion board, and I am hoping that you folks can help me! I am the founder of a research project...

    Started by rbottner‎, 01-28-2007 09:11 PM
    • Replies: 2
    • Views: 4,739
    01-29-2007, 11:02 PM Go to last post
  57. how to derive following solution for uniform distributions?

    Hi, I have the following situation. In a rectangular cartesian coordinate of length L and breadth B, you choose any two points randomly (i.e. you...

    Started by yakrider‎, 01-26-2007 08:00 PM
    • Replies: 3
    • Views: 4,513
    01-30-2007, 11:17 AM Go to last post
  58. Question Calculating mean/sd from Chi squared for power analysis

    I am working on a project which utilizes several research articles in my field. The first one does not report means and standard deviations, only chi...

    Started by Katherine‎, 01-30-2007 02:42 PM
    • Replies: 0
    • Views: 3,770
    01-30-2007, 02:42 PM Go to last post
  59. Question Expecteation and population mean

    Can someone out there assist me to understand if there exist any difference between Expectation EX and Population mean "mu". I have completely lost...

    Started by leon kale‎, 01-28-2007 03:10 PM
    • Replies: 3
    • Views: 2,322
    01-30-2007, 06:47 PM Go to last post
  60. Help Please Binomial Probability Distribution

    Help Please Binomial Probability Distribution I am given this problem 72% of americans have online access Out of a sample of 30 people

    Started by sgtshep‎, 01-28-2007 04:42 PM
    • Replies: 1
    • Views: 2,311
    01-30-2007, 09:59 PM Go to last post

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