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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: 66,954
    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: 197,166
    07-16-2014, 11:01 AM Go to last post
  1. Rampaging somethings in the something something system

    i am strugling with the following question i cant seem to get my head around it....the standard deviation of the the masses of 800 blocks is 252kg. A...

    Started by a.j‎, 10-30-2012 02:12 PM
    • Replies: 0
    • Views: 1,221
    10-30-2012, 02:12 PM Go to last post
  2. Final project, help profavor! :)

    I forgot about the sampling thing, so here's the question (sorry if too long) Obtaining a representative sample from a population: The population...

    Started by a00226270‎, 12-11-2011 12:07 PM
    • Replies: 5
    • Views: 3,391
    12-11-2011, 09:10 PM Go to last post
  3. Question Sum of squares model proof

    Hello everyone :-) I'm trying my best to prove the formula for the sum of squares model (please excuse how badly i'm going to write this) ...

    Started by A0063377‎, 02-19-2014 07:26 PM
    anova, model, proof, statistics, sum of squares
    • Replies: 1
    • Views: 1,157
    02-20-2014, 02:54 PM Go to last post
  4. T-Test for 2 Independent Means or T Test for 2 Dependent Means

    I am comparing two blood glucose meters. I am using a blood sample from the same finger, at the same time using two different blood glucose meters....

    Started by a1985k‎, 04-30-2016 10:33 PM
    • Replies: 3
    • Views: 1,536
    05-01-2016, 09:43 PM Go to last post
  5. Logistic regression vs T tests, and multiple response sets

    Hi, this is a great forum you have here, so I thought I'd ask a small, silly question that's been bugging me for a while. A few weeks ago, I...

    Started by a1rplay‎, 11-17-2010 11:17 PM
    • Replies: 5
    • Views: 7,772
    11-22-2010, 10:05 AM Go to last post
  6. Sampling Distribution Question

    I found an question while reading the textbook, but i not really understand how to answer it, hope to get some help from you guys. A restaurant...

    Started by a22747568‎, 10-19-2016 08:24 AM
    • Replies: 1
    • Views: 4,654
    10-22-2016, 03:06 PM Go to last post
  7. What hypothesis test?

    I have a population of Z items, where X must pass and Y must fail. The thing is that the X that pass is not just a count (i.e. if 2 must pass, it...

    Started by a4567258‎, 10-06-2014 10:50 AM
    bionomial distribution, hypothesis, sample size
    • Replies: 3
    • Views: 1,869
    10-09-2014, 08:14 AM Go to last post
  8. ANOVA -- what is this question asking for?

    An animal scientist recorded the information in the following table from an experiment dealing with wool length measured on twelve sheep randomly...

    Started by a7890‎, 03-17-2011 11:13 PM
    • Replies: 5
    • Views: 3,770
    03-18-2011, 10:44 AM Go to last post
  9. Cumulative distribution function?

    A scientist wants to see if the following "survival times" (hours of operation prior to failure) for a particular component in a machine follow what...

    Started by a7890‎, 03-18-2011 03:22 PM
    • Replies: 1
    • Views: 3,620
    03-18-2011, 05:18 PM Go to last post
  10. SPSS Statistics: Significant Differences between follow-up scores independent groups

    Hi, I have collected data on scores for a sample population before, 1 year after and 6 years after an intervention. All participants in the...

    Started by aa11‎, 04-02-2017 06:46 AM
    anova, mann whitneu u, missing data
    • Replies: 0
    • Views: 675
    04-02-2017, 06:46 AM Go to last post
  11. Is it normal to get a perfect fit using Lisrel to conduct CFA?

    I am using Lisrel to do Confirmatory Factor Analysis. The result is that the Chi-Square statistic for 2 degrees of Freedom is 0.000413 (p=1.00). I...

    Started by aaa1‎, 09-16-2011 10:08 AM
    • Replies: 1
    • Views: 2,891
    09-16-2011, 10:11 AM Go to last post
  12. Choosing best model in regression - Backwards Stepwise + hierarchical modeling?

    Hello - my goal is to fit a model using backwards stepwise regression and hierarchical modeling, testing the association between a primary predictor...

    Started by AAA7‎, 08-19-2013 03:19 PM
    best model, hierarchical model
    • Replies: 1
    • Views: 2,217
    08-19-2013, 03:43 PM Go to last post
  13. Contingency Tables

    I am doing AS Level Statistics, i just finished S1 and started doing S2 however, my teacher is not that experienced at teaching A level, so...

    Started by aadd‎, 02-01-2007 03:12 PM
    • Replies: 1
    • Views: 5,983
    02-01-2007, 11:04 PM Go to last post
  14. Question AS Statistics - Time Series Analysis (S2)

    Hello all My teacher was teaching us Time Series Analysis qiute a while ago and when he was explaining it i didn't understand properly and didn't...

    Started by aadd‎, 05-09-2007 10:24 AM
    • Replies: 0
    • Views: 4,213
    05-09-2007, 10:24 AM Go to last post
  15. Help: contingent ranking, sample size and random

    Hi, I have to research the preferences of respondents for items of which the levels of the attributes do not vary (each item has sevens fixed...

    Started by Aafke‎, 09-07-2009 02:05 AM
    • Replies: 0
    • Views: 1,551
    09-07-2009, 02:05 AM Go to last post
  16. One Sample Hypothesis Test, did I use the correct formula for the p-value on excel?

    :confused: would really appreciate help. I am pretty sure the first tab---the one sample hypothesis test would be a right tailed test, but I am not...

    Started by aahmed03‎, 05-01-2013 08:17 PM
    • Replies: 0
    • Views: 1,159
    05-01-2013, 08:17 PM Go to last post
  17. How to calculate credibility interval limits

    Hi everyone. I'm working on detecting drug adverse reaction signals using health insurance data. I have a problem in getting credibility interval...

    Started by aamssa‎, 09-06-2011 08:36 PM
    • Replies: 1
    • Views: 3,360
    09-06-2011, 08:47 PM Go to last post
  18. Wilcoxon signed rank test help

    Hi - I have data that I wish to perform this statistical test upon but there are a few things i am unsure about, i hope somebody can help! The...

    Started by Aaron‎, 12-13-2006 12:14 AM
    • Replies: 0
    • Views: 4,100
    12-13-2006, 12:14 AM Go to last post
  19. Probability Question

    Hello I am reviewing one of my exams for my final and am very confused when it comes to this question; The probability that at least one of the...

    Started by aaron7058‎, 12-13-2013 07:11 PM
    homework, probability, statistics
    • Replies: 6
    • Views: 1,436
    12-13-2013, 08:42 PM Go to last post
  20. Reverse Coding in GSS, Brief Explanation Requested

    I am doing a data analysis project in my statistics class and my professor liked all the data tables that I had found for my proposal and asked me to...

    Started by aaronbw‎, 10-11-2014 07:16 PM
    • Replies: 0
    • Views: 1,855
    10-11-2014, 07:16 PM Go to last post
  21. Post Comparing groups- what test to use

    Hello, I am looking to compare the means for two groups (midfield - forward; top - bottom) against each other. Could someone please assist me...

    Started by aaronc‎, 02-12-2014 01:35 PM
    compare means, help me!, sport science, statistics, t test
    • Replies: 6
    • Views: 1,417
    02-19-2014, 07:09 AM Go to last post
  22. Scoring System Help Please

    Hi, Im currently completing a research proposal and need to create a scoring system. I have two sets of data which I'm comparing statistically....

    Started by aarongandecha‎, 12-12-2015 12:26 PM
    • Replies: 0
    • Views: 894
    12-12-2015, 12:26 PM Go to last post
  23. Elementary stats help; Hypothesis testing amongst 2 proportions

    so I conducted a survey on sleep habits and I need help on whether or not I reject or fail to reject my original hypothesis. I have to use a...

    Started by AaronWilliam‎, 03-18-2013 12:28 AM
    • Replies: 1
    • Views: 1,105
    03-22-2013, 06:44 AM Go to last post
  24. Question What test to use with 1 group?

    Hello Please provide assistance on what test to use for: 1 group with n = 500 Research QS: Is listening to whistling a problem? Question...

    Started by Aarti‎, 07-06-2016 03:00 AM
    what test to use
    • Replies: 1
    • Views: 1,241
    07-06-2016, 05:04 AM Go to last post
  25. Urgent help :Please help me to prove this question

    hi Please help me to prove this question here and not transferring me to other pages Show that s^2 is an unbiased estimator for sigma^2 I need...

    Started by aasfour1988‎, 03-13-2011 01:11 PM
    dragan, statgirl11
    • Replies: 2
    • Views: 4,936
    03-13-2011, 11:25 PM Go to last post
  26. Creating a Bell Curve with 3 performance parameters

    Hi. I need to create a 20-70-10 performance bell curve for about 500 people using 3 equally weighted performance parameters. I have put all these...

    Started by AB101010‎, 05-17-2010 08:28 AM
    • Replies: 0
    • Views: 4,108
    05-17-2010, 08:28 AM Go to last post
  27. Z-scores for two likert scales?

    I am conducting survey research that has both an online and paper component. There is a descrepancy between the online and paper versions on one of...

    Started by Ab12‎, 09-04-2009 01:14 PM
    • Replies: 0
    • Views: 4,501
    09-04-2009, 01:14 PM Go to last post
  28. Post Rejecting or not rejecting the null hypothesis.

    A city council is considering drafting legislation related to the exclusion of renters with children. Since implementation will be expensive, they...

    Started by ab541393‎, 11-11-2016 09:45 AM
    statistics help
    • Replies: 1
    • Views: 4,156
    11-11-2016, 01:22 PM Go to last post
  29. Main effect not significant, interaction significant

    Hi, I've got some data which is normally distributed, and I have just run a two-way ANOVA on it, with two levels per group. The main effect is...

    Started by abacus‎, 05-22-2013 01:49 PM
    • Replies: 4
    • Views: 4,252
    05-22-2013, 08:27 PM Go to last post
  30. Silly question about the exponential distribution

    So, a product has an expected lifetime of 50 days. So lambda is 50. The mean of lambda is 1/50, meaning that every day there is a 1/50 chance of a...

    Started by abacus‎, 05-09-2014 12:05 PM
    • Replies: 4
    • Views: 1,228
    05-09-2014, 08:36 PM Go to last post
  31. Standard deviation of two sets from only individual set descriptive statistics

    I have two sets of numbers and I have access to their averages and standard deviations. However, I do not have easy access to the actual numbers...

    Started by abakshi‎, 12-10-2014 02:32 PM
    • Replies: 2
    • Views: 1,315
    12-11-2014, 08:22 AM Go to last post
  32. Knowledge discovery

    Hi, I have 100000 units with 10 attributes (attr1, attr2, attr3, etc...) For instance: unit attr1 attr2 attr3 ... 1 a ww ...

    Started by abanero‎, 07-02-2010 04:42 AM
    • Replies: 0
    • Views: 1,781
    07-02-2010, 04:42 AM Go to last post
  33. significant p-value?

    hello I am writing an essay, and I got an r value of 0.1018 at the data I am looking at. the sample size is 13 regions of a country. would this...

    Started by abatementyogin‎, 06-11-2014 03:59 AM
    • Replies: 12
    • Views: 3,316
    06-14-2014, 02:13 AM Go to last post
  34. Question hypothesis testing by mean levels

    hi everyone... i have this homework.. i tried to solve it... can anyone check if it's right or not, please?? Question: The maximum acceptable...

    Started by abbasilubna‎, 11-10-2010 04:07 AM
    • Replies: 1
    • Views: 8,878
    11-11-2010, 03:42 AM Go to last post
  35. HLM Question

    Hello, I am looking at some data on what predicts exam results (outcome variable). I have 2 level 1 predictors (IVs) which are socioeconomic...

    Started by abbie_1111‎, 04-16-2009 05:17 PM
    • Replies: 0
    • Views: 1,526
    04-16-2009, 05:17 PM Go to last post
  36. Q related to chi-square

    Hi guys, I wanted to analyses categorical data using chi-square test. My sample size is 20. I wanted to see if there is any relationship between my...

    Started by abbuka‎, 01-27-2012 04:03 PM
    • Replies: 3
    • Views: 1,607
    01-27-2012, 06:21 PM Go to last post
  37. Don't know what analysis to do, please help.

    Hello guys, I want to analyze categorical data; and I have three independent variables. My sample size is 20. Could you please tell me which test...

    Started by abbuka‎, 01-29-2012 06:54 AM
    • Replies: 1
    • Views: 1,859
    01-29-2012, 09:32 AM Go to last post
  38. Smile White ^ Black balls

    Hi guy's, I tryed to figure out couple of weeks how to solve a statistic problem with white and black balls.I kindly ask you if you can help me a...

    Started by abby‎, 01-28-2016 05:24 PM
    • Replies: 5
    • Views: 2,146
    01-31-2016, 03:44 PM Go to last post
  39. Meaning of basic stats abbreviations

    I'm not a student, I'm a writer and I'm attempting to read some raw statistics and have no idea what the numbers mean. Could someone please put in...

    Started by abbynormal‎, 11-05-2007 06:50 PM
    • Replies: 5
    • Views: 16,292
    11-07-2007, 08:05 PM Go to last post
  40. Please help~~

    An unbiased instrument for measuring distance makes random errors, the distributon of which has standard deviation n, and average of 0. You're...

    Started by abcboy‎, 11-17-2006 06:53 AM
    • Replies: 0
    • Views: 1,773
    11-17-2006, 06:53 AM Go to last post
  41. birthday problem

    ignore this, I have solved the problem

    Started by abcboy‎, 11-25-2006 12:53 AM
    • Replies: 0
    • Views: 2,601
    11-25-2006, 12:53 AM Go to last post
  42. statistical significance of conversions greater than 100%

    Hi there, I am running a landing page test on Google AdWords for my retail website. The control is the current landing page where products are...

    Started by ABCD‎, 10-02-2012 05:15 PM
    • Replies: 1
    • Views: 1,151
    10-09-2012, 01:44 PM Go to last post
  43. need to know number of product view to purchases I need to make a decision

    On my golf equipment website, if on average 1% of product views lead to a purchase, how many views do I need on a new product to determine if it is a...

    Started by ABCD‎, 10-15-2012 04:20 AM
    • Replies: 2
    • Views: 2,068
    10-24-2012, 07:30 PM Go to last post
  44. Product A vs. Product B: How many visits to my website do I need?

    Let's say I have a website and I wanted to see if I could promote certain products through advertising on Google. On a given day, Product A...

    Started by ABCD‎, 02-05-2013 08:15 PM
    • Replies: 1
    • Views: 1,361
    02-06-2013, 07:46 AM Go to last post
  45. Question Please help with simple stats question- Urgent -

    Hi all, I am a newbie into stats so please bear with me :shakehead, I would appreciate your help with this simple question. Deadline is...

    Started by abdellah2082‎, 09-12-2008 11:12 AM
    • Replies: 5
    • Views: 5,167
    09-13-2008, 11:49 AM Go to last post
  46. Drawing an ROC curve

    If I have values for `sensitivity` and `specificity` fora group of studies for example like this: sensitivity specificity -----------...

    Started by Abder-Rahman Ali‎, 07-30-2011 05:27 AM
    roc curve
    • Replies: 3
    • Views: 3,145
    07-30-2011, 07:11 AM Go to last post
  47. ROC curve explanations

    Are there resources you recommend that explain ROC curve for beginners? Thanks.

    Started by Abder-Rahman Ali‎, 07-28-2011 03:18 AM
    • Replies: 1
    • Views: 2,318
    09-15-2011, 07:31 AM Go to last post
  48. Software for drawing an ROC curve

    Having the sensitivity and specificity values, what software do you recommend that enables drawing the ROC curve provided this data? Thanks.

    Started by Abder-Rahman Ali‎, 07-30-2011 06:52 AM
    • Replies: 1
    • Views: 5,426
    07-30-2011, 07:44 AM Go to last post
  49. True positive having a negative value

    Is it fine if someone gets a "negative" value for the True Positive (TP)? Thanks.

    Started by Abder-Rahman Ali‎, 03-24-2014 05:55 AM
    • Replies: 2
    • Views: 1,355
    03-24-2014, 10:45 AM Go to last post
  50. Homogeneity of variances violated for two-way ANOVA, Brown-F & Welch's tests done...

    But the Brown-Forsythe and Welch's tests cannot be performed because "at least one group has the sum of case weights less than or equal to 1. What...

    Started by ABD_4yrs‎, 03-17-2016 12:19 PM
    • Replies: 4
    • Views: 2,037
    03-18-2016, 09:42 AM Go to last post
  51. Likert pre-post test for 3 groups

    Hi there, I have data for a within-subjects study where each subject was asked to perform 3 tasks (in a randomized order to prevent learning...

    Started by abek‎, 01-11-2013 02:27 PM
    • Replies: 0
    • Views: 1,464
    01-11-2013, 02:27 PM Go to last post
  52. Very simple question

    What is the best way to determine something as simple as finding out whether the following test grades are improving (in a sequence): 46, 52,...

    Started by abelian‎, 06-29-2010 01:54 PM
    • Replies: 7
    • Views: 2,826
    06-30-2010, 09:56 AM Go to last post
  53. p-values for groups for C=B/A when you have data on B (n=10-12) and A (n=6)

    For 5 groups, i recently measured property A (n=6) and property B (n=10-12). Using Excel i obtained average, stdev and standard error for each...

    Started by abellare‎, 08-13-2014 03:22 PM
    • Replies: 1
    • Views: 807
    08-13-2014, 07:44 PM Go to last post
  54. Post What Is The Appropriate Statistical Application For My Experiment!!!

    HELLO, :confused: OKAY SO HERE WE GO!!! I HAVE APPROXIMATELY TEN SAMPLES FROM ONE GROUP, 15 SAMPLES FOM A SECOND GROUP, AND THIRTY-FOUR SAMPLES...

    Started by ABELTON‎, 06-13-2008 01:13 PM
    • Replies: 1
    • Views: 3,209
    06-14-2008, 08:48 AM Go to last post
  55. Cronbachs alpha and a

    I am confused about the concept alpha, is there any similarities/differences between Cronbachs alpha and the alpha you set for significance? (eg....

    Started by abenherik‎, 09-17-2007 10:35 AM
    • Replies: 0
    • Views: 2,418
    09-17-2007, 10:35 AM Go to last post
  56. solving for K

    I have tried for a long time to find out how you solve for K in the spearman brown prophecy formula (to find out how many items is required in a test...

    Started by abenherik‎, 09-25-2007 01:49 PM
    • Replies: 1
    • Views: 3,725
    10-05-2007, 01:04 PM Go to last post
  57. sample weights

    Hi, we are starting a survey with 2 stage cluster sampling approach. At first stage we select a fixed number of clusters from total population and...

    Started by abeshkc‎, 06-04-2010 04:19 AM
    • Replies: 1
    • Views: 3,795
    06-12-2010, 01:39 AM Go to last post
  58. Survey design question

    I am designing a household survey with a sample size of 400. This is a two stage design with 40 clusters selected at first stage and 10 households...

    Started by abeshkkc‎, 12-08-2015 07:57 AM
    • Replies: 1
    • Views: 1,139
    06-17-2016, 11:53 AM Go to last post
  59. Question Binomial random variable help

    If X = a binomial random variable with parameters n and p, with 0<p<1 How do I show that P = P Also, how do I prove that as k goes from 0 to n,...

    Started by abe_cooldude‎, 12-02-2006 10:07 PM
    • Replies: 1
    • Views: 3,053
    12-04-2006, 07:29 PM Go to last post
  60. Pca

    I am using SPSS. I am using the factor analysis with extraction Eigen value more the 1. and with the rotated component matrix extracted and the...

    Started by Abhijit‎, 09-25-2008 02:00 AM
    • Replies: 1
    • Views: 1,497
    09-25-2008, 06:48 AM Go to last post

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