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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. 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: 196,753
    07-16-2014, 11:01 AM Go to last post
  2. 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: 66,755
    09-30-2005, 09:44 AM Go to last post
  1. Axiom of regularity

    Dear people, I was wondering what the following sentence actually means: Every non-empty set A contains an element B which is disjoint from A....

    Started by Mkkl‎, 02-04-2013 10:26 AM
    • Replies: 0
    • Views: 692
    02-04-2013, 10:26 AM Go to last post
  2. All you need is mu

    Last time this forum gave me some good help, spotting a mistake that i hadn't noticed. Hopefully this time you can have a look at this and see if...

    Started by Joeseph‎, 02-04-2013 08:59 AM
    • Replies: 1
    • Views: 1,099
    02-04-2013, 09:17 AM Go to last post
  3. Correlation?

    Hello all, I have accuracy scores on 6 different tests. I have calculated the percentage of the accuracy in each test so that each of the tests...

    Started by collegeblock‎, 02-04-2013 05:11 AM
    correlation, linear mixed model, linear model, multiple regression
    • Replies: 1
    • Views: 1,213
    02-04-2013, 08:28 AM Go to last post
  4. Comparing surveys of different sample sizes - age match or not?

    Hi, I have a question about sample sizes and I'm leaning towards one answer but would be interested to hear other peoples thoughts to help formalise...

    Started by statto‎, 02-04-2013 06:48 AM
    • Replies: 1
    • Views: 3,571
    02-04-2013, 06:53 AM Go to last post
  5. How to find the P-value in this problem

    An auto expert claims that the large number of self-serve stations has resulted in poor auto maintenance, and the average tire pressure is more than...

    Started by victor247‎, 02-04-2013 02:58 AM
    • Replies: 0
    • Views: 1,393
    02-04-2013, 02:58 AM Go to last post
  6. Need a couple examples to get me going in the right direction...

    The outside diameter of a part used in a gear assembly is known to be normally distrubuted with a mean of 40mm and standard deviation of 2.5mm. the...

    Started by 98ls10‎, 02-03-2013 10:00 PM
    • Replies: 1
    • Views: 2,408
    02-04-2013, 12:20 AM Go to last post
  7. one-way or two-way ANOVA

    Hi I have an dependent variable ('response amplitude') and two independent variables ('stimulus intensity' and 'side of stimulation'; left/right). ...

    Started by ddlamb‎, 02-03-2013 09:36 PM
    • Replies: 0
    • Views: 1,569
    02-03-2013, 09:36 PM Go to last post
  8. Need Helping Reading This Properly

    It is asking me what % of organs weighs between 290 and 410. I know the answer is 81.5. Where do I start and finish. I get 250 starts at 13.5 then...

    Started by FC Stats‎, 02-03-2013 12:03 AM
    • Replies: 1
    • Views: 1,295
    02-03-2013, 06:43 PM Go to last post
  9. please help me

    Question 1: What does the R2 value mean? Select one: A. Standard error, squared B. Amount of change in the average y value explained by x C....

    Started by BDM2828‎, 02-03-2013 12:00 PM
    • Replies: 1
    • Views: 1,118
    02-03-2013, 12:25 PM Go to last post
  10. Bonferroni correction

    Spherical surface samples are measured for their radii (R) and imaged by a camera. The image is not a numerical value, but m different quantities...

    Started by SaharaWolf‎, 02-02-2013 05:51 PM
    • Replies: 1
    • Views: 960
    02-03-2013, 06:09 AM Go to last post
  11. Regression Analysis

    Hi There, I have competed the following regression analysis which has returned an equation of: A = (0.2429 * B) + -0.2603 As I already know...

    Started by chan069‎, 02-03-2013 01:38 AM
    regression analysis
    • Replies: 1
    • Views: 869
    02-03-2013, 06:00 AM Go to last post
  12. What is a main effects plot telling me ?

    Here's a hypothetical example (keeping it basic)and my (basic) understanding.... So I want to compare 3 laptop brands (Dell, Sony and Mac) and I...

    Started by urbano‎, 02-03-2013 02:56 AM
    • Replies: 0
    • Views: 2,005
    02-03-2013, 02:56 AM Go to last post
  13. Finding ACF or AR(2)

    So after some calculation Ive got the ACF of AR(2) to be \gamma(k)=\phi_{1}\gamma(k-1)+\phi_{2}\gamma(k-2)=\phi_{1}\gamma(0)+\phi_{2}\gamma(1) but...

    Started by calculuskid1‎, 02-02-2013 07:23 PM
    • Replies: 1
    • Views: 2,184
    02-02-2013, 11:56 PM Go to last post
  14. Some Help Please

    The picture should explain a little more but I had a question. I always thought that Mean<Median was skewed left. Mean>Median was skewed right. ...

    Started by FC Stats‎, 02-01-2013 10:38 PM
    • Replies: 1
    • Views: 1,825
    02-02-2013, 04:43 PM Go to last post
  15. Pearson's or Spearman's?

    I've plotted a scatterplot of rock pool length against limpet frequency, and I have to look for a correlation. The data is fairly widely scattered,...

    Started by Lightf00t‎, 11-30-2011 02:18 PM
    • Replies: 12
    • Views: 12,550
    02-01-2013, 02:23 PM Go to last post
  16. Proportions test

    Iam interested in assessing if my proportion is significant. I have no clue what to do and how to do it. I use R for programming. I appreciate your...

    Started by srini‎, 02-01-2013 09:22 AM
    proportions
    • Replies: 3
    • Views: 2,478
    02-01-2013, 10:19 AM Go to last post
  17. meta-analysis p value chi-square vs. randomization test

    pls. can some one help me to interpret these results this is an output while running a categorical random/mixed effect model. I am confused which p...

    Started by sania‎, 01-31-2013 10:54 PM
    • Replies: 0
    • Views: 1,560
    01-31-2013, 10:54 PM Go to last post
  18. xyplot() out of order

    This is my code: graph<-xyplot(D$DV+D$IPRED~D$TIME1 | paste("ID: ",D$ID), data=D, layout=c(3,3), xlab="Time (hr)", ylab="Concentration...

    Started by toothpicky‎, 01-30-2013 05:30 PM
    • Replies: 2
    • Views: 1,557
    01-31-2013, 10:44 PM Go to last post
  19. Post Continuous random variable help

    Hey everyone, I have to do some homework that involves a continuous random variable problem. I am given that the pdf is f(y)=8y and 0<y<0.5 I...

    Started by aslavin1‎, 01-30-2013 06:16 PM
    • Replies: 2
    • Views: 1,978
    01-31-2013, 05:35 PM Go to last post
  20. Variance of Sample Mean Comparison

    Hi, "Suppose that two populations have equal population variances but have different sizes: N_1=100,000,\ N_2=10,000,000 . Compare the variances...

    Started by S-C-3-1-3‎, 01-31-2013 02:14 AM
    • Replies: 1
    • Views: 2,768
    01-31-2013, 05:16 PM Go to last post
  21. Standard Deviation of a Ratio Parameter?

    Hello, I am sitting over the following problem- maybe someone of you has an idea to solve it or has faced the same problem in the past. I have...

    Started by Marc_Berlin1‎, 01-29-2013 03:06 PM
    ratio sd
    • Replies: 6
    • Views: 1,840
    01-31-2013, 03:47 PM Go to last post
  22. Backing up from data

    Hi all, I have results from a test done several years ago, however I don't have the dataset used, and would like to back up to it (or get a...

    Started by Avitra‎, 01-31-2013 11:40 AM
    • Replies: 0
    • Views: 894
    01-31-2013, 11:40 AM Go to last post
  23. Stats measure to describe difference between two data sets?

    Hi folks, Behold these two graphs of the S&P 500 index, one from 1950-1997 & the other from 1998 to the present. (The y-axis is in dollars.) ...

    Started by ossicle‎, 01-24-2013 01:15 PM
    • Replies: 8
    • Views: 4,004
    01-31-2013, 10:39 AM Go to last post
  24. suggest suitable Statistical test

    Very simple problem... There is a store where 100 people visit, 52 are males and 48 are females, so the proportion is 0.52 and 0.48 respectively Is...

    Started by chetan.apa‎, 01-25-2013 09:23 AM
    • Replies: 14
    • Views: 2,206
    01-31-2013, 08:08 AM Go to last post
  25. T-test to compare two means with only means and n known

    Hi statistics geniuses! I've been looking around not being able to find out how, if at all, it is possible to test whether two means are different...

    Started by macunaima‎, 01-29-2013 06:39 AM
    compare means, t-test
    • Replies: 2
    • Views: 1,364
    01-30-2013, 06:40 PM Go to last post
  26. Pivot-style chart with multiple variables and frequencies

    Hello everybody, I'm dealing with what seems to be (and probably is) a simple things, but I couldn't find a way to sort it out: I have a dataset...

    Started by PhedeB‎, 01-30-2013 04:13 PM
    • Replies: 0
    • Views: 1,442
    01-30-2013, 04:13 PM Go to last post
  27. comparing two groups multiple datapoints for one parameter - how?

    Hello, I have the following problem (example): I want to compare the size of apples for two sorts of apple trees. So I measure the diameter of...

    Started by Hagen‎, 01-30-2013 12:57 PM
    • Replies: 0
    • Views: 950
    01-30-2013, 12:57 PM Go to last post
  28. Covariance of simple expression

    Hi, Given the two normal distributed variables: x ~ N(mu, sigma) y = ax + b where a and b are constants, then find: Cov( max(x,0) ,...

    Started by sydfremmer‎, 01-30-2013 10:02 AM
    • Replies: 1
    • Views: 1,095
    01-30-2013, 11:33 AM Go to last post
  29. paired t test: How important is the t-value for reporting ?

    Good day everyone. I have a question about a paired t test which i just performed "5 times" for my set of 500 samples. Details below: ...

    Started by pooja‎, 01-30-2013 06:45 AM
    paired samples t-test
    • Replies: 0
    • Views: 2,036
    01-30-2013, 06:45 AM Go to last post
  30. Poisson Limit

    Have written this and wondering on your opinions? http://capacitas.wordpress.com/2013/01/28/the-power-of-the-poisson-limit/ First time i...

    Started by Joeseph‎, 01-30-2013 05:45 AM
    • Replies: 3
    • Views: 1,237
    01-30-2013, 06:15 AM Go to last post
  31. Poisson Limit

    Have been writing a series of blogs on statistics and was wondering if you had any opinions on this: ...

    Started by Joeseph‎, 01-30-2013 05:35 AM
    • Replies: 0
    • Views: 821
    01-30-2013, 05:35 AM Go to last post
  32. Post Probability situation HELP!

    A special school size of 1,500 students, with 60% boys and 40% girls. Each day, the principle chooses 10 students for cleaning bathrooms but does not...

    Started by ally514‎, 01-29-2013 07:45 PM
    • Replies: 1
    • Views: 3,124
    01-29-2013, 11:11 PM Go to last post
  33. Is Mixed-Model Anova the Appropriate Test to Use?

    Hi Everyone, I would like to know if participants use their walking aid significantly more after taking part in an intervention when compared to...

    Started by bozatron‎, 01-29-2013 11:09 PM
    • Replies: 0
    • Views: 961
    01-29-2013, 11:09 PM Go to last post
  34. Deriving the variance of the sampling distribution.

    Hi, I guess i am being stupid but i am a little stuck with part of the derivation of the variance of the sampling distribution of the mean. I...

    Started by 2scoops‎, 01-29-2013 05:28 PM
    • Replies: 1
    • Views: 2,676
    01-29-2013, 06:17 PM Go to last post
  35. Central limit theorem and statistical process control

    Hello I have a question...according to the central limit theorem, we say that if I have a sample X1,...,Xn, and if it's not necessarily normally...

    Started by Yankel‎, 01-29-2013 04:09 AM
    • Replies: 7
    • Views: 2,077
    01-29-2013, 03:42 PM Go to last post
  36. calulating a sample size for a PhD project

    Hello all, And thank you for viewing my post, I have begun developing my PhD proposal and become unstuck on sample size calulations. this is what...

    Started by amiz‎, 01-26-2013 09:17 AM
    samplesize
    • Replies: 5
    • Views: 3,011
    01-29-2013, 03:02 PM Go to last post
  37. Sample Size and Chi-Square Goodnes-of-Fit Test

    Hello. New member here and I have a question for the group. When computing the Chi-Square test statistic in the Chi-Square Goodness-of-Fit...

    Started by Vypa‎, 01-29-2013 11:16 AM
    • Replies: 7
    • Views: 2,519
    01-29-2013, 01:51 PM Go to last post
  38. Advantages of Structural Equation Models

    I have been asked to justify SEM as generating useful information not available through regression. Its important because we have to appeal a policy,...

    Started by noetsi‎, 01-28-2013 05:39 PM
    • Replies: 2
    • Views: 2,632
    01-29-2013, 01:17 PM Go to last post
  39. Diversity Analysys

    I'm using the Shannon-Wiener diversity index to find out if there's a correlation along a transect, but I'm not sure weather or not to use averages...

    Started by codod‎, 01-29-2013 01:05 PM
    • Replies: 0
    • Views: 1,536
    01-29-2013, 01:05 PM Go to last post
  40. Finding the right column at t-table for 1 and 2-tailed tests

    Could you please suggest me the most intuitive way to be able to select the correct column in t table for one and 2 tailed tests at different levels...

    Started by nepal‎, 01-29-2013 10:03 AM
    one-tailed tests, t-test, two-tailed
    • Replies: 2
    • Views: 1,234
    01-29-2013, 12:05 PM Go to last post
  41. using statistics in mobile application testing

    i've made a simple mobile application that functions as sending a message to a contact list and when they receive the message, their android phone...

    Started by usuitakumi‎, 01-29-2013 09:35 AM
    applications, testing
    • Replies: 0
    • Views: 1,169
    01-29-2013, 09:35 AM Go to last post
  42. 3-Parameter Weibull Distribution

    Nevermind. My exponent was in the wrong location.

    Started by simplemts‎, 01-28-2013 08:57 PM
    • Replies: 0
    • Views: 1,182
    01-28-2013, 08:57 PM Go to last post
  43. A little bit of combinatorics

    I didn't find a subforum devoted to combinatorics in this forum, so I post my question here. I have two sets. In one set I have N elements a1, ......

    Started by Usaty‎, 01-28-2013 06:04 AM
    • Replies: 4
    • Views: 1,528
    01-28-2013, 01:01 PM Go to last post
  44. Comparing hazard ratios from univariate cox proportional hazards

    My study is comparing definitions for a certain condition. 500 patients have had either a positive or negative diagnosis of a condition, for 10...

    Started by dhmallon‎, 01-28-2013 05:07 AM
    • Replies: 0
    • Views: 2,903
    01-28-2013, 05:07 AM Go to last post
  45. Normalization of samples and fold change calculation

    Hi, I have 4 samples of read counts and i want to compare these samples to see different patterns. These samples are not standardized, so i have...

    Started by bari‎, 01-28-2013 04:23 AM
    coverage, foldchange, log, normalization
    • Replies: 0
    • Views: 2,132
    01-28-2013, 04:23 AM Go to last post
  46. What kind of distribution is that?

    Suppose, you have a register with, say, 30 cells. Each cell might be 0 (probability p = 0.95) or 1 (probability q = 1-p = 0.05). The register has a...

    Started by Usaty‎, 01-27-2013 09:50 AM
    • Replies: 14
    • Views: 1,658
    01-27-2013, 11:21 PM Go to last post
  47. Symmetric Distribution with 10% beyond 6 deviations

    The probability of being above and below the mean are equally likely (We have a symmetric distributions). 10% of the events are more than 6 times...

    Started by simplemts‎, 01-27-2013 08:44 PM
    • Replies: 6
    • Views: 1,198
    01-27-2013, 09:29 PM Go to last post
  48. Expected Value and Variance of Empirical distribution function

    Hey guys, So Ive been looking everyone for a proof of the following E(\hat{F_{n}}(x))=F(x) and Var(\hat{F_{n}}(x))=(F(x)-(1-F(x)))/n I know that...

    Started by calculuskid1‎, 01-27-2013 11:42 AM
    • Replies: 13
    • Views: 6,506
    01-27-2013, 09:19 PM Go to last post
  49. is this correct?

    I am reviewing a paper that examined the outcome of a surgical procedure. The study compared rates of complications as percentages in their...

    Started by bgaynes‎, 01-25-2013 12:57 PM
    • Replies: 4
    • Views: 1,509
    01-27-2013, 02:20 PM Go to last post
  50. What statistical test to use?!

    Hi everyone, I am having trouble working out what parametric statistical test to use. My study uses a randomised cross-over repeated-measures...

    Started by bozatron‎, 01-26-2013 08:05 PM
    • Replies: 1
    • Views: 1,428
    01-26-2013, 09:36 PM Go to last post
  51. Question Relationship between Two Varibles: Finding the Covariance, Correlation, and IQR

    Eight randomly selected students who completed a course in Statistics were asked (1) the number of months between when they finished Algebra and...

    Started by reilyn‎, 01-26-2013 04:51 PM
    • Replies: 10
    • Views: 2,143
    01-26-2013, 07:38 PM Go to last post
  52. Correction of p-value for multiple testing - What's my value of 'n' in Bonferroni?

    Hey everyone! I have a statistical question you might be able to help me with. I hope all the terms I use are correct and it's understandable...

    Started by reptile1893‎, 01-26-2013 01:20 PM
    • Replies: 0
    • Views: 1,517
    01-26-2013, 01:20 PM Go to last post
  53. Correct test (z-test?) for differences in replicated, log-normally distributed data

    Hi there, I can't seem to determine the correct test to use, after searching through forum posts with similar but not quite the same type of data. ...

    Started by Johnstat‎, 01-26-2013 12:22 PM
    • Replies: 0
    • Views: 1,277
    01-26-2013, 12:22 PM Go to last post
  54. Question Mediation when the independent variable is a moderator (interaction) variable

    Hello, I have a simple question for which I could not find an answer on internet. I have a simple X-Y-Z mediation model. However X variable is an...

    Started by Buraczku‎, 01-26-2013 09:41 AM
    • Replies: 0
    • Views: 1,151
    01-26-2013, 09:41 AM Go to last post
  55. identify under-performing meter / counter

    Hello All; I would be gratfull if you could help me solving a problem that I need to integrate into an automation system. The problem is: 1- I...

    Started by alex4evr‎, 01-24-2013 12:05 PM
    • Replies: 1
    • Views: 1,067
    01-26-2013, 09:32 AM Go to last post
  56. Question Anderson-Darling Normality Test

    Hi all, I am not big with statistics or excel, so forgive me if I ask basic and simple questions. I have a macro set up in excel '07 to...

    Started by japalish‎, 07-20-2009 03:19 AM
    • Replies: 3
    • Views: 6,150
    01-26-2013, 07:41 AM Go to last post
  57. help with t.test (equal or unequal variances)

    Hi all, I am trying to better understand how the t.test works. I obtained extremely different results if I used the R's t.test with or without...

    Started by Federico‎, 09-13-2012 07:54 AM
    • Replies: 5
    • Views: 2,245
    01-26-2013, 07:09 AM Go to last post
  58. How to compute a measure of the similarity of products

    Hi, I'm trying to the compare the overall similarity of alternative products to a baseline product. Each product has 5 measurable attributes...

    Started by bradyj2‎, 01-25-2013 10:28 AM
    • Replies: 5
    • Views: 1,422
    01-26-2013, 06:39 AM Go to last post
  59. How do I solve this?

    Hi all. First post here. I work in accounting and would like to apply some statistics to help solve an issue. We use a standard costing...

    Started by ItPaysTheBills‎, 01-25-2013 11:01 PM
    • Replies: 0
    • Views: 1,112
    01-25-2013, 11:01 PM Go to last post
  60. Comparing subpopulations in a single sample

    This involves a single sample with individuals in that sample working in areas (no worker can be in two different areas). What I want to tell is if...

    Started by noetsi‎, 01-25-2013 08:41 PM
    • Replies: 6
    • Views: 1,935
    01-25-2013, 10:03 PM Go to last post

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