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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: 196,557
    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: 66,616
    09-30-2005, 09:44 AM Go to last post
  1. Question ANOVA confusion

    Hello, I am presently working on a dissertation and have no idea which type of ANOVA to run, although I was advised to perform one. I sent out a...

    Started by patty1016‎, 06-14-2010 06:49 PM
    • Replies: 13
    • Views: 4,908
    06-21-2010, 03:09 PM Go to last post
  2. Statistical Problems on Excel

    Any secret geniuses like Good Will Hunting out there? Attached are 6 statistical problems on Excel. The challenge is to be able to solve this in a...

    Started by No_Statistician‎, 08-06-2010 02:46 PM
    • Replies: 13
    • Views: 3,733
    08-08-2010, 12:39 AM Go to last post
  3. Red face Help!!!

    Can you see if I am correct? Identify each of the random variables described below as discrete or continuous The ounces of fountain drink...

    Started by SadieKhan‎, 10-20-2010 04:16 PM
    • Replies: 13
    • Views: 4,167
    10-21-2010, 05:56 PM Go to last post
  4. help with the confidence

    can anyone please explain the confidence interval process. such as how to find it and how to solve using it

    Started by marcusbillings‎, 12-15-2010 01:35 PM
    • Replies: 13
    • Views: 3,547
    12-15-2010, 09:11 PM Go to last post
  5. too many females in sample

    I have a problem I have 148 females and 48 males. What do I do? I have looked it up everywhere and can not figure it out.

    Started by loathesome‎, 03-15-2011 05:54 PM
    • Replies: 13
    • Views: 3,445
    03-16-2011, 09:05 PM Go to last post
  6. Logistic Regression Help Needed

    ....................

    Started by UCFstudent‎, 11-09-2011 06:02 PM
    • Replies: 13
    • Views: 3,745
    11-16-2011, 12:26 PM Go to last post
  7. What sort of data is this? In a pickle

    Hi, sorry first of all if is could be suited more towards a different catagory. Basically ive done questionaire and one question is : 3....

    Started by 98107‎, 11-10-2011 02:40 PM
    climate, likert, ordinal, test
    • Replies: 13
    • Views: 2,792
    11-10-2011, 06:50 PM Go to last post
  8. Interpret Chi-Square Goodness-of-Fit Test?

    Hi and thank you for reading this post, I ran a factor analysis on a scale and its data, and it came with a "Chi-Square goodness-of-fit" output...

    Started by statn00b‎, 11-18-2011 01:08 PM
    • Replies: 13
    • Views: 20,655
    11-18-2011, 03:45 PM Go to last post
  9. Can Confidence Interval have zero width?

    Is it possible for Confidence Interval to have zero width? If yes, how would you interpret?

    Started by ledzep‎, 11-18-2011 10:57 PM
    • Replies: 13
    • Views: 4,094
    11-20-2011, 03:17 PM Go to last post
  10. no idea where to even start this homework problem HELP!!!!

    The variables x and y in the data below are related by a linear relationship. a) Assuming that the standard deviation σi for data point n yi is...

    Started by Sam Belsky‎, 12-07-2011 06:11 PM
    • Replies: 13
    • Views: 2,090
    12-09-2011, 03:05 AM Go to last post
  11. Beer

    Hi, I am preparing for a test and I need help in this question: Tree # of Individuals # of Trees S.D. of Diameter Oak ...

    Started by Beer‎, 01-19-2012 08:56 AM
    • Replies: 13
    • Views: 2,848
    01-20-2012, 12:09 PM Go to last post
  12. Hypothesis Testing

    I'm not really sure if this is hypothesis testing, but I've got the feeling and want it to confirm with your help. Please see attached image for my...

    Started by dEconomist‎, 01-20-2012 11:57 AM
    • Replies: 13
    • Views: 2,494
    01-20-2012, 07:03 PM Go to last post
  13. Did I build the model right?

    Does this sound reasonable? >Tested each variable, both categorical and continuous, by a proc glm, against the continuous outcome, dose. >put...

    Started by StatsClue‎, 02-09-2012 11:47 PM
    • Replies: 13
    • Views: 4,392
    02-12-2012, 06:52 PM Go to last post
  14. Japanese Beetle Larvae

    I currently have no idea how to complete this question, which is why I came here asking for some help/hints on how I could do this. How I could start...

    Started by MrAnon9‎, 02-13-2012 12:36 PM
    • Replies: 13
    • Views: 3,036
    02-15-2012, 07:12 PM Go to last post
  15. How would you find the folllowing

    The question is..... Find the following four distances to test how close the data set is to the Empirical Rule If the mean is 21.51 and the S....

    Started by jjhall5150‎, 02-28-2012 03:34 PM
    • Replies: 13
    • Views: 3,038
    02-29-2012, 12:00 PM Go to last post
  16. Normality assumptions questions

    I have a dataset in which I am trying to compare numbers of birds responding to 3 treatments (actually a little more complicated, but for simplicity,...

    Started by Kayaker‎, 08-08-2012 02:20 PM
    • Replies: 13
    • Views: 2,989
    08-08-2012, 03:11 PM Go to last post
  17. Lightbulb Statistical test for questionnaire results

    Hello, I'm trying to establish a relationship between people having Deaf friends/family and their understanding of the problems Deaf children can...

    Started by katy‎, 08-24-2012 08:16 AM
    • Replies: 13
    • Views: 5,462
    08-24-2012, 06:56 PM Go to last post
  18. moderator vs. mediator variable

    I've encountered these terms 100s of times and looked up their definition and tried to understand them at least 15 times. I'm really trying to get...

    Started by trinker‎, 09-04-2012 09:07 AM
    mediator, moderator
    • Replies: 13
    • Views: 36,895
    09-06-2012, 11:12 AM Go to last post
  19. Simple simulation problem!

    Hi, I have a problem that will probably be very simple for the experts on this forum. I don't have any statistical background, so this is a bit too...

    Started by ser01‎, 09-10-2012 10:05 AM
    • Replies: 13
    • Views: 1,775
    09-12-2012, 09:57 AM Go to last post
  20. Help writing what I'm doing mathematically

    I am not a mathematician and thus need major help representing my actions mathematically. First I'll explain what I'm doing and then a crack at...

    Started by trinker‎, 09-26-2012 01:42 PM
    formula, math notation, notation
    • Replies: 13
    • Views: 2,623
    10-07-2012, 10:25 PM Go to last post
  21. Lightbulb ANOVA or Kruskal Wallis

    Dear Stats experts here... I have a question: I am counting cells in histology slides of certain timepoints after a treatment. day 0, day...

    Started by med1234‎, 10-18-2012 04:02 PM
    anova, kruskal wallsi, non parametric, parametric
    • Replies: 13
    • Views: 4,337
    10-24-2012, 11:09 PM Go to last post
  22. Exclamation Need help in Thesis Proposal (Correlational Study) NEED HELP ASAP!

    So my central question is this: Is there a correlation in positive emotional output between winning and losing among young-adult to middle-aged NBA...

    Started by Russ369‎, 11-29-2012 03:10 AM
    • Replies: 13
    • Views: 1,925
    11-29-2012, 01:01 PM Go to last post
  23. Distributions

    I realise this is going to annoy some of you for its simplicity, but when I was "interviewed" I said I wanted to understand more about distributions....

    Started by bugman‎, 12-13-2012 02:54 AM
    • Replies: 13
    • Views: 2,451
    03-09-2013, 11:38 PM Go to last post
  24. Box's Test sig .000 - now what?

    I'm running a manova (teaching myself along the way) and I can't seem to get a handle on something - I'm not sure if I'm having a sample size problem...

    Started by mjgray‎, 01-18-2013 03:03 AM
    • Replies: 13
    • Views: 8,298
    02-24-2013, 06:31 PM Go to last post
  25. Exclamation Absolutely lost!

    Hi everyone, I am trying to figure out how to solve the following problem and can't, for the life of me, understand which test I should use. My...

    Started by canadiandude‎, 01-19-2013 10:28 AM
    • Replies: 13
    • Views: 1,965
    01-19-2013, 07:32 PM Go to last post
  26. Should i use ancova or anova? One continuous variable and one categorical variable.

    I have one dependent variable that is continuous. It is the score on a particular achievement test. I have two independent variables. One categorical...

    Started by kelvarnsen‎, 03-26-2013 10:19 AM
    ancova, anova
    • Replies: 13
    • Views: 9,236
    03-27-2013, 09:29 AM Go to last post
  27. 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: 6,478
    01-27-2013, 09:19 PM Go to last post
  28. Coin tossing simulation in R

    I need help with this problem: Toss a fair coin until a head shows up, estimate the expectation of the number of tosses required by simulation....

    Started by violette‎, 08-19-2013 12:47 PM
    • Replies: 13
    • Views: 5,185
    08-24-2013, 10:04 AM Go to last post
  29. Question Which analysis is appropriate for our study design with multiple DV's at 3 levels?

    Our bachelor research is about distance perception in the peripersonal space. The experiment was already complex to design with the oculus rift, but...

    Started by Kyana‎, 04-24-2014 02:58 PM
    • Replies: 13
    • Views: 1,824
    04-25-2014, 03:45 PM Go to last post
  30. I really need help interpreting this study?

    Hello, I'm actually trying to write a sociology paper on race, but I have no idea how to interpret this study:...

    Started by JC177‎, 07-25-2014 03:01 PM
    • Replies: 13
    • Views: 1,715
    07-27-2014, 01:02 PM Go to last post
  31. Post help finding the proportion ?

    Started by tflow‎, 08-08-2014 08:59 AM
    • Replies: 13
    • Views: 2,140
    08-09-2014, 10:55 PM Go to last post
  32. What type of distribution is?

    Usually results of direct measurements are normally distrubuted. Also, if we make linear transformation on result. e.g. if X it is a normally...

    Started by etelebaxi‎, 08-22-2014 06:42 AM
    distribution, lambert beer law, logarithm, lognormal, normal
    • Replies: 13
    • Views: 2,162
    08-27-2014, 10:31 AM Go to last post
  33. Using a Correlation Matrix with no data in SPSS

    I have a correlation matrix with the correlations between each set of five independent variables and the correlation between each IV and the DV. I...

    Started by Sammy Little‎, 09-19-2014 02:38 PM
    correlation matrix, linear regression, no data st, spss
    • Replies: 13
    • Views: 3,370
    09-22-2014, 04:07 PM Go to last post
  34. Cool Data analysis with a GEE, is my method valid?

    Hi everyone, I’ve been doing some statistical analyses in R on some data. It’s for use in a manuscript I’m hoping to get published in a biological...

    Started by Reese‎, 09-23-2014 02:14 AM
    gee, glm, glmm
    • Replies: 13
    • Views: 4,973
    10-07-2014, 10:01 PM Go to last post
  35. calculating probability of disease according to age

    I'm making a program which, at one point, is supposed to estimate the probability of having a certain disease based on the patient's age. I'm going...

    Started by justry‎, 10-23-2014 04:08 PM
    age, disease, mean 1, probability, standard deviation
    • Replies: 13
    • Views: 3,117
    10-24-2014, 02:27 PM Go to last post
  36. Additive effect, how to calculate?

    Dear users, I hope you have some good ideas about the following Medical dilemma. I'm conducting a study about Three drugs, A + B + C. Drug A...

    Started by drgunnar‎, 11-18-2014 06:44 AM
    additive, drugs, effect
    • Replies: 13
    • Views: 4,335
    11-19-2014, 04:04 PM Go to last post
  37. [Checking/Help] Hypothesis Testing and Chi-squared Test

    Hi there, I have two questions that need to be submitted online, and was hoping someone could check my answers before I submit them. Question 1...

    Started by TaylorC‎, 12-07-2014 09:57 AM
    • Replies: 13
    • Views: 1,857
    12-11-2014, 05:31 AM Go to last post
  38. Question Help...please?

    Hi, I'm a bioscience student - stats are not my strength - and I'm trying to analyze some data on R (which I am using for the first time) and I'd...

    Started by RuserJoe‎, 02-05-2015 04:54 AM
    • Replies: 13
    • Views: 2,109
    02-15-2015, 12:51 PM Go to last post
  39. choosing the right statistical test for comparing data, when do you use which test

    Hello all, I would like some feedback on the right approach of analysing data, comparing means of groups of data. Currently I work with the...

    Started by JoachimPCS‎, 04-21-2015 01:41 AM
    anova, comparing means, kruskal wallis, non parametric, parametric
    • Replies: 13
    • Views: 1,986
    04-22-2015, 03:31 AM Go to last post
  40. Regression analysis with non-integer event rates

    I am working as part of a team on a relatively large dataset which has been subject to imputation analysis. One of my colleagues has pointed out...

    Started by 123Michael456‎, 07-13-2015 06:37 AM
    event rate, regression analysis
    • Replies: 13
    • Views: 2,232
    07-13-2015, 03:12 PM Go to last post
  41. Which statistical test should I use?

    So here's what I got: I have the odds of detecting a particular native amphibians species during surveys. This is broken down by whether or not a...

    Started by skybutton‎, 08-02-2015 12:48 PM
    • Replies: 13
    • Views: 1,907
    10-05-2015, 01:37 PM Go to last post
  42. [Prism 5] Gather or Individual Analysis? ANOVA or Kruskal?

    To whom it may help: My research is on cellular/molecular responses after hormones farmacological administration and I'm not quite sure how to...

    Started by luiscls‎, 08-24-2015 08:35 AM
    3 samples, anova, kruskal-wallis, normality issue
    • Replies: 13
    • Views: 2,188
    08-28-2015, 08:49 AM Go to last post
  43. Exclamation Fitting a distribution to continuous data

    Hello, I have a data set of 1300 samples and I am trying to find out the distribution for these data. I have used ARENA's Input Analyzer to find...

    Started by rajaanveshbaru‎, 09-12-2015 01:33 PM
    • Replies: 13
    • Views: 2,011
    09-15-2015, 07:53 AM Go to last post
  44. Question Some non-linear regression equations

    Hello , I have 4 predictor variables X1,X2,X3,X4 and one response variable Y . I need some non-linear regression equations for these...

    Started by civilized‎, 10-13-2015 07:10 PM
    non-linear regression
    • Replies: 13
    • Views: 2,837
    10-25-2015, 10:27 AM Go to last post
  45. help with ANCOVA results

    I need to do an ANCOVA for an ecology paper, but as the title says, I need help to report the results. I ran the ANCOVA in Excel using the xlstat...

    Started by iamjedimaster‎, 12-10-2016 07:55 PM
    • Replies: 13
    • Views: 2,576
    12-12-2016, 02:53 PM Go to last post
  46. What kind of test for...

    Hi guys, i have multiple biological parameters in multiple patients during a period of two years and when to check for correlation or relation ...

    Started by Gbouvet‎, 09-05-2017 11:00 AM
    • Replies: 13
    • Views: 352
    09-06-2017, 03:09 PM Go to last post
  47. Statistic problem consiting of Student t-test problem

    Hi, I'm stuck on a question and was wondering if you guys could help me. This is the problem I have a question about: This question continues on...

    Started by Emawk‎, 03-04-2006 09:55 PM
    • Replies: 12
    • Views: 9,573
    03-08-2006, 08:04 PM Go to last post
  48. Help to choose appropriate statistics for research

    I am working on my first research project. I am really junior in this matter. My research aims to explore factors associated with change of financial...

    Started by mag‎, 08-02-2007 03:38 AM
    • Replies: 12
    • Views: 4,180
    08-03-2007, 05:45 AM Go to last post
  49. Laplace distribution

    Hi all. I have a query regarding the Laplace (double exponential) distribution. I have conducted some experiments measuring the orientation of...

    Started by eazlth‎, 04-18-2008 05:40 AM
    • Replies: 12
    • Views: 4,604
    04-21-2008, 08:23 AM Go to last post
  50. Joint PDF Integration

    The joint pdf is f(x,y) = e^(-y) , 0<=x<=y I want to find the expected value of XY, so E(XY) = DoubleIntegral What are the boundaries for...

    Started by shrek‎, 07-16-2008 03:48 AM
    • Replies: 12
    • Views: 4,386
    07-16-2008, 12:06 PM Go to last post
  51. Standard deviation and sample size

    Hi. I have no background on statistics, so please just go down to fundamental for me. But here are some basic questions about statistics and standard...

    Started by risingstar3110‎, 12-03-2014 10:26 PM
    model, precision
    • Replies: 12
    • Views: 4,100
    12-16-2014, 05:52 AM Go to last post
  52. Question CDF of average

    Hi all, I hope that someone can help me with this! I have a list of values as below: 82.1134 84.5516 91.1851 65.6035 69.971 92.4706 79.1505...

    Started by lina2401‎, 01-08-2015 09:19 AM
    cdf
    • Replies: 12
    • Views: 2,979
    01-14-2015, 04:34 PM Go to last post
  53. Which analysis should I use, and how?

    Hi guys, I am quite new to statistics, but I am trying to write a paper on tax compliance costs, and I am now looking for ways to analyse the...

    Started by BabyJane‎, 01-18-2015 03:17 PM
    • Replies: 12
    • Views: 3,459
    01-21-2015, 12:01 PM Go to last post
  54. Bayesian inference, Bayes estimator

    Let X a single observation of distribution U~, where \theta is a random variable with density \pi(\theta)=\theta e^{-\theta},\theta >0 a)find a...

    Started by askazy‎, 03-30-2015 08:17 PM
    • Replies: 12
    • Views: 3,215
    03-31-2015, 05:02 PM Go to last post
  55. Multiple regression: Why does a new control variable make an old one insignificant?

    Okay guys, I've tried Googling this, but I couldn't really find any good results. I've made a regression analysis of attitudes towards gender...

    Started by Regression‎, 04-27-2015 02:00 PM
    • Replies: 12
    • Views: 2,975
    04-27-2015, 05:33 PM Go to last post
  56. Negative confidence intervals in regression

    Hi all, So I'm really stumped. Basically I have a negative standardised coefficient value of -0.35, and a 95% CI equals (-0.47, -0.23). I'm having...

    Started by redsocks‎, 05-01-2015 12:53 AM
    coefficient, confidence-interval, negative
    • Replies: 12
    • Views: 3,780
    05-03-2015, 10:20 PM Go to last post
  57. Introduction and question

    Greetings All, My name is Glen. I'm an industrial mechanic in southern Washington. I have been reviewing graphs of data collected from a compressed...

    Started by Grayco‎, 10-27-2015 05:39 PM
    • Replies: 12
    • Views: 3,247
    10-29-2015, 04:57 PM Go to last post
  58. Why is log transformation valid?

    got my question answered thank you

    Started by paperrockbazooka‎, 11-19-2015 06:50 PM
    • Replies: 12
    • Views: 2,937
    11-21-2015, 03:06 PM Go to last post
  59. Finding the p value

    I am taking a statistics class, and i have some problems Understanding a formula. The formula in question is like this: ...

    Started by bok11‎, 11-10-2016 09:37 AM
    p-value
    • Replies: 12
    • Views: 1,907
    11-10-2016, 12:30 PM Go to last post
  60. Confidence interval: true or false?

    We have measured the concentration cesium-137 in the tissue of 15 tunafish. We may consider the distribution as normal distribution and a 95 %...

    Started by medicalstatistics‎, 02-18-2017 08:30 AM
    confidence interval, medical statistics
    • Replies: 12
    • Views: 2,165
    02-19-2017, 04:10 PM Go to last post

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