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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: 66,697
    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: 196,675
    07-16-2014, 11:01 AM Go to last post
  1. Homework problem

    I need help with part C of this problem. Here is what I have done so far: Suppose that the weights of adult bull mastiffs are normally...

    Started by dworla‎, 07-08-2006 03:27 PM
    • Replies: 3
    • Views: 3,109
    07-10-2006, 10:32 AM Go to last post
  2. Likert Scale Analysis

    Hello all, I am looking to apply a statistical test to some Likert data. My survey responses were scaled 1 to 5 (strongly disagree to strongly...

    Started by theswits‎, 07-04-2006 04:08 PM
    • Replies: 4
    • Views: 50,532
    07-11-2006, 12:00 AM Go to last post
  3. Question Hierarchical regression

    Hi all, Just have a quick question regarding hierarchical regression. Hypothetical example: DV: happiness IV 1: age (entered in first block)...

    Started by Nin‎, 07-11-2006 12:46 AM
    • Replies: 0
    • Views: 2,558
    07-11-2006, 12:46 AM Go to last post
  4. Question Mahalanobis distance

    Hi all, In the table of critical values for Mahalanobis distance, there is "number of variables" and "critical value". My question is, does "number...

    Started by Nin‎, 07-11-2006 01:00 AM
    • Replies: 0
    • Views: 6,080
    07-11-2006, 01:00 AM Go to last post
  5. Confidence Interval Help

    I am really stumped on this one: In a sample of 400 seeds, 240 germinated. Estimate the true germination rate with a 90% and 99% confidence...

    Started by sxg23‎, 07-12-2006 08:28 PM
    • Replies: 1
    • Views: 2,625
    07-13-2006, 04:03 PM Go to last post
  6. Cronbachs Alpha

    Okay, so I'm a student and have to calculate the reliability of a test, I have the test devided into it's various measures - only one (containing 13...

    Started by Brendan‎, 07-14-2006 11:37 PM
    • Replies: 1
    • Views: 2,665
    07-15-2006, 07:44 PM Go to last post
  7. Extracting an elusive sigma

    Can anyone help me please? I have a tubular vertical screw-elevator, a new invention! I would like to make some conclusions regarding the...

    Started by GaryJH‎, 07-18-2006 04:51 PM
    • Replies: 0
    • Views: 2,127
    07-18-2006, 04:51 PM Go to last post
  8. Q1 and Q3 determination from QD and MEAN

    Hi i have a problem. and i m not sure how to solve it. my question is that there are two Quartiles Q1 and Q3, their QD = 12.6 and the mean is...

    Started by zeeshanhashmi‎, 07-09-2006 07:41 AM
    • Replies: 3
    • Views: 3,709
    07-19-2006, 06:13 AM Go to last post
  9. one sample t test (beta=0)

    Hello. I have a dumb question about one sample t test. If I want to test the hypothesis: beta=0 , what is the formula for the t statistic? Is it:...

    Started by Mightyphil‎, 07-22-2006 04:07 PM
    • Replies: 1
    • Views: 6,648
    07-22-2006, 04:37 PM Go to last post
  10. Is there software that includes post hoc tests for nonparametric data?

    Hello all, I have used the Kruskal-Wallis nonparametric test to identify if there are differences among groups. The p-value was 0, meaning there...

    Started by celibec‎, 07-22-2006 05:01 PM
    • Replies: 0
    • Views: 5,494
    07-22-2006, 05:01 PM Go to last post
  11. Confused about my data file

    I have conducted a pilot study on two individuals (Likert data). These individuals completed a survey, every three days for 8 weeks. Their data looks...

    Started by napalm‎, 07-21-2006 10:15 AM
    • Replies: 4
    • Views: 2,710
    07-23-2006, 01:27 AM Go to last post
  12. Chi-squared Goodness of Fit Questions

    Hi folks, A request for some basic help with Chi-squared testing: Say we have two different Likert samples (strongly agree, agree, neutral,...

    Started by theswits‎, 07-18-2006 10:56 AM
    • Replies: 5
    • Views: 6,668
    07-24-2006, 07:00 AM Go to last post
  13. Question exam review HELP!!!

    The question is: Mr. Brown recently purchased 100 randomly selected machine scres with a defective rate of 10%. What is the probability that he...

    Started by palay8‎, 07-26-2006 01:14 AM
    • Replies: 0
    • Views: 2,556
    07-26-2006, 01:14 AM Go to last post
  14. Comparing multiple subject groups

    Hi all! I have a question regarding the analysis of some of my dissertation data. Briefly, I have data for a number of biomechanical variables...

    Started by Piltdown13‎, 07-26-2006 02:27 PM
    • Replies: 0
    • Views: 3,147
    07-26-2006, 02:27 PM Go to last post
  15. Adjusting regression for finite populations

    I have a sample of 150 from a population of 300, so when deciding whether a variable is significant in a regression I need to use a finite population...

    Started by stepha‎, 07-28-2006 04:58 AM
    • Replies: 0
    • Views: 2,661
    07-28-2006, 04:58 AM Go to last post
  16. Question t test or ANOVA or both???

    Hey Everyone, I'm a Newby who has just joined this forum and already I have a question for you all. I'm wondering which analysis to conduct......

    Started by Celebrate the Nerd!!‎, 07-09-2006 08:34 PM
    • Replies: 4
    • Views: 2,495
    07-28-2006, 07:09 AM Go to last post
  17. ANOVA and sig. question

    I have a question about ANOVA and statistical significance. I have a 18 question Likert style survey, with about 400 replies. I am analysing...

    Started by Billyvic‎, 07-22-2006 06:15 PM
    • Replies: 3
    • Views: 3,111
    07-28-2006, 07:15 AM Go to last post
  18. binary spatial data

    Hi, Just working on an environmental project about vegetation mapping. I've got a regular grid of points with percentage of plants for each...

    Started by sartorius‎, 07-29-2006 10:46 AM
    • Replies: 0
    • Views: 2,833
    07-29-2006, 10:46 AM Go to last post
  19. Chi square test procedure in SAS

    Hi does anybody know the appropiate proc for a chi square test in SAS program. Would it be possible to include blocks in the model statement? thanks

    Started by ron‎, 07-30-2006 09:45 PM
    • Replies: 0
    • Views: 2,241
    07-30-2006, 09:45 PM Go to last post
  20. Assuming Normal distribution

    I have some data, and i need to assume that its is distributed both with a normal and student-t distribution. How do I do that? thanks

    Started by kirpa_karo@hotmail.com‎, 07-31-2006 09:40 AM
    • Replies: 1
    • Views: 2,416
    08-02-2006, 10:29 PM Go to last post
  21. Statistics for prescriptions...

    Ok... I am working for a National Wildlife Refuge in Arkansas and am needing some help with some statistical work. I have an equation out of a...

    Started by jccarter1‎, 08-02-2006 09:53 AM
    • Replies: 1
    • Views: 1,697
    08-02-2006, 10:37 PM Go to last post
  22. Unhappy Parametric Analysis help!

    Hey there have a problem question: I'm producing 2 types of jackets short and long. 2 types of work done on them, cutting & sewing. Cutting...

    Started by fatjoe‎, 08-06-2006 01:50 AM
    • Replies: 0
    • Views: 1,878
    08-06-2006, 01:50 AM Go to last post
  23. Tests for secular trend...am I on the right track?

    Hi- This is not homework, but a project rather for both my work and graduate program. I collected data from a large outpatient clinic in my area...

    Started by rocknroll_ghost‎, 07-28-2006 10:26 AM
    • Replies: 1
    • Views: 3,368
    08-06-2006, 12:50 PM Go to last post
  24. Probit Analysis

    Hi everybody! I am new in your forum and I have a question for you. I hope you will be able to help me solve my problem. I am trying to estimate...

    Started by kefth‎, 07-29-2006 12:31 PM
    • Replies: 1
    • Views: 3,216
    08-06-2006, 01:08 PM Go to last post
  25. Question One question about expriment design, please help!

    I am a little confused about nested design and block design. Please see following example, how do you think? It is a block design or nested? Six...

    Started by yingxie‎, 08-06-2006 03:44 PM
    • Replies: 0
    • Views: 1,921
    08-06-2006, 03:44 PM Go to last post
  26. Transformation of variables...Need help pls!

    Please could someone tell me if i have the right answer and correct it if need be Q: Suppose X is uniformally distributed on [0,pi), and a new...

    Started by hmm...chocolate..‎, 08-01-2006 04:46 PM
    • Replies: 5
    • Views: 2,950
    08-06-2006, 10:39 PM Go to last post
  27. Partial point biserial correlation anyone?

    Hi! Is there such a thing as a partial point biserial correlation and if so, is it preferable to use this instead of conducting an ANCOVA when...

    Started by lilithlacuna‎, 08-07-2006 11:29 AM
    • Replies: 0
    • Views: 5,496
    08-07-2006, 11:29 AM Go to last post
  28. optimal blending of 3 models

    I have 3 models that have produced losses based on historical industry-wide mix of business (property) and particular clients mix of business...

    Started by lw6767‎, 08-09-2006 10:08 AM
    • Replies: 0
    • Views: 2,265
    08-09-2006, 10:08 AM Go to last post
  29. Z-score for Skewness and Kurtosis

    Hi, I have a sample of data (about a hundred numbers) and I would like to roughly estimate whether they follow a normal distribution or not. From...

    Started by Bruno‎, 08-09-2006 06:48 AM
    • Replies: 3
    • Views: 30,049
    08-10-2006, 11:46 PM Go to last post
  30. Value-at-Risk of a distribution?

    Hi, I have returns data for 2 assets for a 10 year period. I want to determine the Value-at-Risk for the distribution of this data. I have...

    Started by kirpa_karo@hotmail.com‎, 08-09-2006 04:00 PM
    • Replies: 2
    • Views: 3,147
    08-12-2006, 10:22 AM Go to last post
  31. Red face A Simple Survey -- Critique Me!

    Hi everyone! First time poster here! :wave: I'm designing a survey for my small business -- but unfortunately, I know very little about...

    Started by JulieGirl1982‎, 08-13-2006 04:02 PM
    • Replies: 0
    • Views: 1,833
    08-13-2006, 04:02 PM Go to last post
  32. probability calc

    please ignore previous

    Started by lostinspace‎, 08-13-2006 04:22 PM
    • Replies: 0
    • Views: 2,274
    08-13-2006, 04:22 PM Go to last post
  33. Critical t value with .04 significance level

    The problem I am working on tests a claim with a significance level of .04 and it's a left-tailed test with degrees of freedom at 84. In my...

    Started by sweetsncheese‎, 08-12-2006 12:35 PM
    • Replies: 4
    • Views: 13,064
    08-13-2006, 11:48 PM Go to last post
  34. Central tendancy measure for broadband internet speeds

    I have collected over 120 observations of broadband internet speeds achieved through my service provider. The values range from, 5 kilobits per sec....

    Started by br945‎, 08-14-2006 01:08 PM
    • Replies: 0
    • Views: 3,301
    08-14-2006, 01:08 PM Go to last post
  35. logistic regression

    I am using JMP to do a nominal logistic regression analysis. Even though JMP provides me with an output model, the parameter estimates are all...

    Started by tz800‎, 08-14-2006 02:15 PM
    • Replies: 0
    • Views: 2,964
    08-14-2006, 02:15 PM Go to last post
  36. normal distribution help

    A worker earns $15 per hr at a plant and is told that only 2.5% of all workers make a higher wage. If the wage is assumed to be normally distributed...

    Started by wanye‎, 08-14-2006 11:04 AM
    • Replies: 3
    • Views: 2,689
    08-15-2006, 07:56 AM Go to last post
  37. Question chi-square goodness-of-fit test

    I have a question regarding the chi-square goodness-of-fit test: A manager is reviewing information from his five stores and gets the following...

    Started by redman11‎, 08-14-2006 10:50 AM
    • Replies: 1
    • Views: 2,920
    08-15-2006, 01:52 PM Go to last post
  38. Minimum Sample Size required

    Hi everyone, I was wondering if you can help me track down an answer I should probably already know how to find. Assuming I take 1000 calls in a...

    Started by BeeFL‎, 08-15-2006 02:43 PM
    • Replies: 0
    • Views: 3,407
    08-15-2006, 02:43 PM Go to last post
  39. Shannon-Weaver question - please help me

    Sorry if this is in the wrong place. Is the Shannon-Weaver Diversity Index even a statistical test? I don't know......... I think I need to apply...

    Started by Thick As Treacle‎, 08-15-2006 06:53 PM
    • Replies: 0
    • Views: 2,573
    08-15-2006, 06:53 PM Go to last post
  40. determine sample size using confidence interval?

    Hi all, I've just started learning stats. Need help on some questions that I dont quite really understand just by reading the book. How do I...

    Started by wanye‎, 08-14-2006 04:32 AM
    • Replies: 1
    • Views: 4,368
    08-15-2006, 09:16 PM Go to last post
  41. Chi squared or ANOVA for variances analysis

    Which is a better method for testing of variances? Chi squared or ANOVA?

    Started by leekit‎, 07-21-2006 12:45 AM
    • Replies: 6
    • Views: 3,714
    08-15-2006, 09:54 PM Go to last post
  42. Question NASA TLX analysis?!?

    Hi folks -please has anyone got any advice on how to analyse NASA Task Load Index (TLX) data? Some people treat it loosely as interval data and...

    Started by mcgeemr‎, 08-16-2006 10:10 AM
    • Replies: 0
    • Views: 5,463
    08-16-2006, 10:10 AM Go to last post
  43. Need help in analysis

    Hi....All stats gurus ....kindly help me with this I have data from 12 patients, and we have measured 5 hemodynamic variables ( Systolic Blood...

    Started by rajmd‎, 08-14-2006 06:23 PM
    • Replies: 3
    • Views: 2,279
    08-16-2006, 11:36 AM Go to last post
  44. Comparing groups - z-scores

    I have two groups A and B. Each subject has provided scores on a number of tests, and I want to give each subject an overall score based on these...

    Started by Alsvartr‎, 08-16-2006 03:20 AM
    • Replies: 2
    • Views: 7,652
    08-16-2006, 11:59 AM Go to last post
  45. My brain hurts- confidence intervals

    I have probably been looking at this problem for too long- it is just a sample problem, not part of an assignment, but I am so stuck! I seem to be...

    Started by Glass4‎, 08-14-2006 07:57 PM
    • Replies: 3
    • Views: 2,315
    08-17-2006, 01:35 AM Go to last post
  46. please help

    Hi all Can I get some help from you, I am a research student I developed questionnaire to get some information but after I get the results I am...

    Started by almohandes‎, 08-09-2006 07:04 AM
    • Replies: 2
    • Views: 2,460
    08-18-2006, 05:43 AM Go to last post
  47. How to convert ordinal into interval?

    Hi all, i'm a new member here.. I have a problem, right now i'm on my undergraduate thesis, my thesis is about the relation between internal audit...

    Started by smartmushu‎, 08-16-2006 04:29 AM
    • Replies: 4
    • Views: 21,244
    08-18-2006, 02:35 PM Go to last post
  48. Mann Whitney U Test problem

    Hi! I have worked out Mann Whitney U Tests by hand, and afterwards checked them on internet computer programmes, except that one of them doesn't...

    Started by Thick As Treacle‎, 08-18-2006 02:45 PM
    • Replies: 0
    • Views: 4,235
    08-18-2006, 02:45 PM Go to last post
  49. Lightbulb ANOVA - Main effects and interactions

    I have a question about ANOVA main effects and interactions. If my main effects are not significant, can I go ahead and make any sense out of...

    Started by CBABD‎, 08-15-2006 09:35 PM
    • Replies: 4
    • Views: 3,812
    08-18-2006, 10:58 PM Go to last post
  50. Correct statistical test to use

    I'm a stats & SPSS novice, and I'm trying to think through a statistical testing question I have. Part of this involves using SPSS, so I apologize in...

    Started by Tennessee Steel‎, 08-16-2006 05:17 PM
    • Replies: 2
    • Views: 3,502
    08-18-2006, 11:01 PM Go to last post
  51. Can anyone help me with this Spearman test?

    Hi everyone I am doing a Spearman correlation as part of a university project and wondered if anyone can help me with it please? I have to find a...

    Started by ironic_lettuce‎, 08-19-2006 06:44 AM
    • Replies: 0
    • Views: 3,713
    08-19-2006, 06:44 AM Go to last post
  52. Question In desperate need of help

    :confused: Hello everyone! I am in dire need of help with my statistics, about which I know little. Assistance is needed to help me complete a...

    Started by majojo‎, 08-19-2006 10:54 AM
    • Replies: 0
    • Views: 2,611
    08-19-2006, 10:54 AM Go to last post
  53. power calc with coeff of variation

    Dear all, I am a neuroimager and I measure the levels of different chemicals in the brain. We did a test-retest study on our measures (10 subjects...

    Started by ongurd‎, 08-20-2006 08:56 AM
    • Replies: 2
    • Views: 3,283
    08-20-2006, 09:55 PM Go to last post
  54. Thumbs down Moving average

    Hi, I am looking for a way to test de difference between two moving average. I want to know if the moving average at time t is equal or not to the...

    Started by Gilles‎, 08-21-2006 09:54 AM
    • Replies: 0
    • Views: 2,980
    08-21-2006, 09:54 AM Go to last post
  55. SD of an average

    I have a statistics question, relevant to an engineering project. A quantity was measured N times, with an average of A and a standard deviation...

    Started by HMM‎, 08-23-2006 08:18 AM
    • Replies: 1
    • Views: 2,830
    08-23-2006, 02:58 PM Go to last post
  56. how to analyse rank ordering

    Hi, I'm not sure the best way to analyse my data. I'm getting people to arrange a list of terms from most.. to least.. I can calculate the mean...

    Started by FionaM‎, 08-24-2006 01:43 AM
    • Replies: 0
    • Views: 2,111
    08-24-2006, 01:43 AM Go to last post
  57. Exclamation Using factor analysis to test hypothesis

    I have 8 variables (different types of reading material): V1, V2, V3, V4, V5, V6, V7 and V8. According to theory variables V1-V5 should represent one...

    Started by igor‎, 08-18-2006 02:06 PM
    • Replies: 1
    • Views: 5,503
    08-24-2006, 09:04 AM Go to last post
  58. I am lost

    I have taken fairly well to statistics so far, but I have been totally stumped by this most recent addition to my level of confusion: p-values ...

    Started by Glass4‎, 08-24-2006 05:45 PM
    • Replies: 2
    • Views: 2,101
    08-25-2006, 10:33 AM Go to last post
  59. Question About Statistical Significance

    Greetings, I am currently working on a project where I analyzed a company's client data and I am currently trying to figure out...

    Started by yunmin‎, 08-24-2006 04:48 PM
    • Replies: 1
    • Views: 2,409
    08-25-2006, 10:43 AM Go to last post
  60. Question On exploratory research

    Hello, My first thread was not that all successful in terms of replies (probably due to my limited knowledge of statistics and consequently a...

    Started by majojo‎, 08-24-2006 04:51 PM
    • Replies: 2
    • Views: 2,316
    08-25-2006, 01:57 PM Go to last post

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