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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: 196,960
    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: 66,858
    09-30-2005, 09:44 AM Go to last post
  1. What F value stands for in ANOVA analysis?

    Hi everyone, When I do ANOVA test, I notice in the output many values among them P, F values. Could somebody please tell me what F value in...

    Started by statser‎, 03-02-2009 05:08 AM
    • Replies: 11
    • Views: 314,298
    05-27-2015, 08:09 AM Go to last post
  2. Basic Statistic Question dealing with different factors affecting a response

    Hello all... This should be a simple question but I can't seem to figure out what to exactly use. Here is my problem: I have a about 6...

    Started by ilikeshirt‎, 06-24-2014 03:59 PM
    • Replies: 11
    • Views: 2,015
    07-07-2014, 08:18 AM Go to last post
  3. R Squared Value, Anything other than indicator of how much variance is accounted for?

    Hi all! Long time lurker but first time poster, normally been able to find everything I need on here! Having a bit of bother with a non-linear...

    Started by kyle212‎, 01-06-2014 05:00 PM
    • Replies: 11
    • Views: 1,663
    01-06-2014, 06:32 PM Go to last post
  4. Multple Regression

    I am doing research on the effect of online professional development on educators use of technology in the classroom using the seven constructs of...

    Started by deemcg‎, 01-07-2014 10:16 AM
    empty f value, empty p value, multiple regression
    • Replies: 11
    • Views: 1,777
    01-07-2014, 01:38 PM Go to last post
  5. Help Needed in Statistical Analysis of Simulation Results

    Hello Fellow Members, I am a novice in statistical analysis. I have a situation and I do not know what to do. Request you the learned guys please...

    Started by vivek‎, 12-19-2013 12:18 PM
    • Replies: 11
    • Views: 2,887
    12-20-2013, 08:36 PM Go to last post
  6. Is this blood sample normal?

    Hi everyone, I'm new here... first post. Also very new to statistics, but I'm really keen to learn. I'm looking for some advice, as I'm...

    Started by chaneleom‎, 02-25-2014 04:51 PM
    • Replies: 11
    • Views: 2,251
    02-25-2014, 09:23 PM Go to last post
  7. Data normality / Process Capability

    Hi All, I would really appreciate if someone could help me with the following query... I have 30 batches of continuous data (weight data) and...

    Started by Tuts‎, 03-19-2014 04:53 PM
    • Replies: 11
    • Views: 3,004
    03-24-2014, 01:09 AM Go to last post
  8. Red face Needd Help Choosing Test : More than Two Proportions using SPSS

    New in Statistics: Help needed to choose the Correct Test: ( maybe Chi-square): I have following information: Type1 Type2 Type3 Type4 ...

    Started by edwincwc‎, 09-07-2014 08:48 AM
    • Replies: 11
    • Views: 3,432
    09-07-2014, 11:15 AM Go to last post
  9. Deviance for "neutral"

    Hello, if I define a numerical scale from 1 to 9, where 1 is "very negative" and 9 is "very positive" and define 5 as the value for "neutral",...

    Started by jstorc‎, 02-24-2015 12:32 PM
    • Replies: 11
    • Views: 2,058
    02-24-2015, 02:46 PM Go to last post
  10. Thumbs up Want to know Expression of t.test

    There is a function t.test in R , i want to know the expression of t.test function; how can i know it. Example : We have simple "mean" function in R...

    Started by sajalgoel‎, 05-13-2015 08:26 AM
    • Replies: 11
    • Views: 2,593
    05-28-2015, 08:12 AM Go to last post
  11. Different significance results when table transposed?

    Following the example given in a Surveymonkey blog post, https://www.surveymonkey.com/blog/105/02/9/statistical-significance-see-close-truth/ I...

    Started by sysmod‎, 05-25-2015 05:39 AM
    • Replies: 11
    • Views: 2,311
    06-05-2015, 02:40 AM Go to last post
  12. Simple problem

    Hi all. Just have a quick question. If I have a measure and its SD, say 1.24 metres (0.3), how do I calculate the new SD if I change the measure...

    Started by Darkest Horse‎, 07-11-2015 12:35 PM
    • Replies: 11
    • Views: 2,165
    07-19-2015, 01:19 PM Go to last post
  13. Student software licenses for academic study

    I'm having a problem with a US stats software provider that insists on classifying PhD work as commercial if the student has any detectable...

    Started by BunnstromR‎, 09-25-2015 11:13 AM
    • Replies: 11
    • Views: 2,198
    09-26-2015, 04:30 PM Go to last post
  14. Main effect vs. Interaction effect in ANOVA

    I think that a researcher is in general more likely to find a significant main effect than a significant interaction effect in ANOVA. Do you agree...

    Started by SMcfarland‎, 11-30-2015 10:17 AM
    anova, interaction effect, main effect
    • Replies: 11
    • Views: 2,547
    11-30-2015, 04:04 PM Go to last post
  15. Which test should I use for two unequal groups ?

    Hi all! I have data that include 20 samples divided into 2 groups (category A and category B). The groups are independent, none of the value in...

    Started by AgataM‎, 12-11-2016 11:03 AM
    mann-whitney test, normal distribution, student t-test, welch's t-test
    • Replies: 11
    • Views: 3,341
    12-11-2016, 04:37 PM Go to last post
  16. Multicollinearity issue

    Hi, I have a multivariable logistic model, and one of my categorical independent variables has 5 possible levels, with each level calculated as a...

    Started by martink‎, 12-25-2016 11:57 PM
    • Replies: 11
    • Views: 3,426
    12-28-2016, 10:10 AM Go to last post
  17. Data distribution

    If I have a single column of data; the weights of 100 individuals measured. How would I test to see what sort of distribution the weights follow. And...

    Started by 101tai101‎, 08-07-2017 04:44 PM
    • Replies: 11
    • Views: 578
    08-09-2017, 03:37 AM Go to last post
  18. Need help please, should I use ANOVA or chi square?

    Hi there! I am trying to work on a university paper and I am having a hard time with the stats part. I have asked some participants (29) to...

    Started by pmcarosella‎, 08-30-2017 12:34 PM
    • Replies: 11
    • Views: 514
    08-31-2017, 10:56 AM Go to last post
  19. How can I determine if two graphs are statistically significantly different

    Hi, I'm working on a medical research project and need some stats help. I have limited statistical knowledge but I understand that basics. I need...

    Started by Mary12‎, 09-07-2017 01:39 AM
    graphs, statistical difference, test of difference, test of significance
    • Replies: 11
    • Views: 556
    09-09-2017, 12:38 PM Go to last post
  20. Mean or median for central tendency

    Classify each of the narratives below based on whether the mean or median provides a better description of the center of its distribution: 1. Age...

    Started by starkmaester‎, 10-08-2017 04:34 AM
    • Replies: 11
    • Views: 292
    10-10-2017, 05:54 PM Go to last post
  21. Question Employee Performance Project Help

    Hello all, I have a project I'm working on and I need some advice. I have only a very basic knowledge of stats. Here goes... Your company has a...

    Started by JDC‎, 11-03-2005 11:01 AM
    • Replies: 10
    • Views: 4,670
    11-13-2005, 08:20 PM Go to last post
  22. Unhappy Very stuck with simple problem.

    Hi everyone, :wave: I am at the end of my tether with trying to sort out the statistics for my report. It's simple stuff but I am hopeless with...

    Started by Stuck‎, 09-04-2006 07:32 AM
    • Replies: 10
    • Views: 3,472
    09-04-2006, 09:48 AM Go to last post
  23. statistics Books

    Hi everybody, I am new to this forum. I am a technical Analyst. I do analysis for Computer Systems using statistics. I am interested to learn...

    Started by NeerajDBA‎, 05-15-2007 12:56 AM
    • Replies: 10
    • Views: 6,537
    06-07-2007, 09:12 AM Go to last post
  24. z-score nightmare

    ok, I read the thread about not doing someones homework for them. I have worked this problem, and can't figure out what the H I am doing wrong. ...

    Started by marymary75‎, 08-07-2007 01:48 PM
    • Replies: 10
    • Views: 4,107
    08-07-2007, 04:08 PM Go to last post
  25. pattern probability

    This isn't homework, but wasn't sure where else to post it. For the following pattern: AA..K.V.. (where . represents any character - there are...

    Started by kdt2006‎, 08-13-2007 07:12 AM
    • Replies: 10
    • Views: 3,168
    08-13-2007, 11:32 AM Go to last post
  26. P value of a statistical test

    If the p-value of a statistical test is .038 and the level of significant chosen for the hypothesis tst if .05 then. I believe the correct answer...

    Started by pmcn‎, 05-25-2008 12:05 PM
    • Replies: 10
    • Views: 6,405
    05-28-2008, 10:00 PM Go to last post
  27. Which test to use?

    I am a doctoral candidate doing research on personality differences between IT and CS professors. To simplify my question, I have changed the topic...

    Started by cecild‎, 10-29-2008 03:17 PM
    • Replies: 10
    • Views: 3,354
    11-03-2008, 05:54 PM Go to last post
  28. variance of population mean...

    .. when the population consists of two sub-populations. size of sub-population1: 20.000 size of sub-population2: 10.000 size of sample...

    Started by zxc‎, 10-30-2008 01:07 PM
    • Replies: 10
    • Views: 5,091
    11-08-2008, 08:43 AM Go to last post
  29. What is the difference between Students t distribution and normal distribution?

    I thought the t-distribution was supposed to be normal. However, when I run p-p plots on my data comparing the t distribution and the normal...

    Started by somnum‎, 11-25-2008 11:25 AM
    • Replies: 10
    • Views: 25,829
    11-26-2008, 05:48 PM Go to last post
  30. selecting ANOVA over T test

    Hello, I am a graduate student in science preparing for my defence and taking a bit of heat regarding the statistical test I chose for an...

    Started by jeffreyg‎, 11-28-2008 02:21 PM
    • Replies: 10
    • Views: 3,924
    12-02-2008, 09:44 AM Go to last post
  31. z-standardizing and centering...are they the same?

    It would seem that peforming these preparatory measures to transform the data are the same. However, I have received differing opinions. I have been...

    Started by danielkeeton‎, 11-30-2008 01:45 PM
    • Replies: 10
    • Views: 12,993
    12-03-2008, 06:40 PM Go to last post
  32. One-tailed to two-tailed

    My homework problem is the following... The P value is 0.80, and this is a one-tailed P value. What is the P value if this study becomes two-tailed?...

    Started by runnernurse‎, 12-02-2008 02:18 PM
    • Replies: 10
    • Views: 6,304
    12-02-2008, 07:44 PM Go to last post
  33. simple normal distribution question

    Hello, studying for a test and need to make sure.. If X1 - X2 ~ N(0, 2 sigma^2), how do I convert them to N(0,1)? What is the general formula for...

    Started by hanelliot‎, 04-24-2009 09:49 PM
    • Replies: 10
    • Views: 3,383
    04-25-2009, 11:07 AM Go to last post
  34. descriptive statistics, easy question

    hello, I got a small question, I think I know the answer and just want to confirm it with you guys: A researcher is interested in comparing the...

    Started by WeeG‎, 10-09-2009 01:51 PM
    • Replies: 10
    • Views: 4,824
    10-14-2009, 07:07 PM Go to last post
  35. Cool Normality -please help

    I have big problems with my normal distribution and would be very thankful if anyone could help. I have been looking around the forum but cant...

    Started by mango‎, 10-20-2009 11:17 AM
    • Replies: 10
    • Views: 5,272
    10-25-2009, 06:20 AM Go to last post
  36. Rank data-proper test

    Ok I will admit I am getting old, and out of practice so those graduate level classes might not have been useful :-) I have 3 data sets. Within...

    Started by Flashpoint‎, 12-08-2009 03:34 PM
    • Replies: 10
    • Views: 3,837
    12-17-2009, 12:32 PM Go to last post
  37. Interpretation of ANOVAs and ANCOVAs.

    I have a question about how to interpret ANOVAs with a covariate. Here is what I've generated with SPSS, I understand the main effects etc, but I...

    Started by ericm4‎, 05-23-2010 02:18 PM
    • Replies: 10
    • Views: 4,357
    05-23-2010, 06:28 PM Go to last post
  38. Need to solve this equation

    I am trying to solve the following equation for Tc (Temperature in celsius). My end goal is to map the curve of the relationship between temperature...

    Started by rwd5013‎, 06-07-2010 06:34 AM
    • Replies: 10
    • Views: 4,135
    08-19-2010, 01:42 PM Go to last post
  39. Unhappy What if ANOVA post-hoc isn't significant, but T-test is?

    The general question I have is, what do I do when a post-hoc difference comparison of 2 means form an ANOVA (that has a total of 4 groups) shows no...

    Started by hwc007‎, 06-10-2010 03:30 PM
    • Replies: 10
    • Views: 24,204
    06-10-2010, 05:42 PM Go to last post
  40. Calculating Coefficients of regression with discrete Predictors

    I know that in case of interval predictors, the coefficients such as beta are the slope of the line and have a specific formula. But, what would be...

    Started by convivial‎, 07-14-2010 10:14 AM
    • Replies: 10
    • Views: 4,927
    07-14-2010, 06:47 PM Go to last post
  41. finding distribution

    Let X_{1}, X_{2}, ... X_{n} be a random sample from a distribution with pdf f(x;\theta) = \frac{1}{\theta} , 0<x \le \theta . The cdf of X is ...

    Started by madara123‎, 09-11-2010 07:33 AM
    • Replies: 10
    • Views: 3,600
    09-14-2010, 12:03 PM Go to last post
  42. Probabilities of Geometric Random Variables question

    W(1) and W(2) are independent random variables with parameters p(1) and p(2). It asks to find P(W = W) and P(W < W) I found W(1) = W(2) as 1/n...

    Started by StatStudent3‎, 10-12-2010 09:18 AM
    • Replies: 10
    • Views: 6,860
    10-12-2010, 08:08 PM Go to last post
  43. Question Game-show probability

    A person is playing in a game show where is wins money for giving correct answers(similar to Who Wants to be a Millionaire). The person has won...

    Started by graphviz‎, 11-12-2010 08:06 AM
    • Replies: 10
    • Views: 5,037
    11-13-2010, 04:44 AM Go to last post
  44. Stats help Urgent!!

    Hello, I have an assignment due tomorrow and i can't seem to figure out this question. Question 1: Carlinville, Illinois, has just started an...

    Started by supehrdrew‎, 12-02-2014 05:26 PM
    • Replies: 10
    • Views: 2,804
    12-02-2014, 11:53 PM Go to last post
  45. Choosing alpha for Pearson's correlations

    Does anyone know of any good references that discuss how to choose alpha for a Pearson's correlation?

    Started by Phdstudentz‎, 12-08-2014 04:35 PM
    • Replies: 10
    • Views: 1,838
    12-09-2014, 04:48 PM Go to last post
  46. Is there a way to convert relative risk to cohen's d or odd's ratios?

    So I only have RR but no counts. For a meta-analysis these need to be put on a common metric with other results which all use cohen's d. Hence the...

    Started by Lazar‎, 01-29-2015 05:58 PM
    • Replies: 10
    • Views: 3,661
    01-30-2015, 05:42 PM Go to last post
  47. Statistical Difference vs. Norm

    Hello, I would appreciate your help with something. I have a study to test an advertisement of n=150. The results are given as percentages for...

    Started by Westermeister‎, 03-11-2015 07:46 AM
    market research, norm, significance, statistical difference
    • Replies: 10
    • Views: 2,307
    03-14-2015, 04:35 PM Go to last post
  48. Welch t-test?

    Several years ago, with the help of some experts in statistics, I selected the Welch t-test for an experiment of mine. I'm now reviewing that...

    Started by makilahy‎, 04-30-2015 09:38 PM
    • Replies: 10
    • Views: 3,895
    05-11-2015, 01:43 AM Go to last post
  49. F test intepretation

    I want to perform f test of the attached data, what are the steps in excel and how can I intrepret the results Thank you.

    Started by thong127‎, 05-01-2015 02:10 PM
    • Replies: 10
    • Views: 1,925
    05-08-2015, 09:59 AM Go to last post
  50. How to plot binary on scatter?

    Ok, so forgive me for my ignorance in some areas of statistics but I am working with a binary output of: 0 and 1. I am also working with a kNN...

    Started by winters‎, 07-01-2015 05:17 AM
    • Replies: 10
    • Views: 1,838
    07-06-2015, 07:57 AM Go to last post
  51. linear probability models: heteroscedasticity

    I have to run linear probability models rather than logistic regression models (dichotomous endogenous variable) and I am wanting to look for a way...

    Started by Lazar‎, 10-01-2015 06:27 PM
    inear probability model
    • Replies: 10
    • Views: 4,440
    10-02-2015, 01:01 AM Go to last post
  52. Red face Create lognormal from a normal distribution

    Hello All, For a research I am doing I have a source that says that the range is 120 seconds to 1260 seconds, and that the mean is 356. Also, that...

    Started by Pabs‎, 11-23-2015 06:55 AM
    • Replies: 10
    • Views: 2,086
    11-24-2015, 05:34 PM Go to last post
  53. What correlation is present on the scatter-plot?

    The options are: 1)+0.3 2)+0.8 3) Could be both, cannot tell just by visualizing the plot.

    Started by Aryon‎, 02-05-2016 12:14 PM
    • Replies: 10
    • Views: 3,120
    02-07-2016, 05:46 AM Go to last post
  54. Determining Causality Between Two Data Sets

    Hey Everyone, I am trying to determine causality between two data sets. I don't think that correlation is the best tool due to the nature of the...

    Started by atcsharp‎, 02-24-2016 06:39 AM
    • Replies: 10
    • Views: 2,290
    02-26-2016, 02:59 AM Go to last post
  55. Means are not equal but hypotesis is not rejected

    Hello, I need to help with my "research" problem. I conducted two sample ttest and I was surprised by my result. On attachement you can see that...

    Started by russel2000‎, 03-21-2016 01:39 PM
    • Replies: 10
    • Views: 2,645
    03-22-2016, 02:06 PM Go to last post
  56. Bootstrap Approach for Effect Size 95% Percentile Interval for Non-parametric Stat

    I am trying to get an effect size for a Wilcoxon rank sum test. There is a postulated approach of dividing the z-score from the normalization of test...

    Started by hlsmith‎, 03-28-2016 01:29 PM
    • Replies: 10
    • Views: 1,791
    04-07-2016, 01:11 PM Go to last post
  57. Sample Size. Binomial

    Hello everyone, I am trying to do an exercice where I have 30 batches of 200 units which have different number of faulty parts, as you can see in...

    Started by cgarcia‎, 06-29-2016 12:58 PM
    • Replies: 10
    • Views: 1,853
    06-30-2016, 11:09 AM Go to last post
  58. Help with Correlation

    Hello! I need help for an issue i have. Let's assume that we have data of two variables (X and Y) for 14 different people. We can find the...

    Started by m1chael‎, 09-21-2016 06:26 AM
    correlation, multiple
    • Replies: 10
    • Views: 1,629
    09-21-2016, 06:26 PM Go to last post
  59. Some IVs are normally distributed but some aren't, how to deal with it?

    Hi there, In my study I had two groups of people (depressed patient vs. healthy control) and I compared their neural physiologic activity (EEG...

    Started by Ping Koo‎, 02-23-2017 05:16 AM
    • Replies: 10
    • Views: 2,628
    02-24-2017, 01:17 PM Go to last post
  60. Establishing Causality

    Hi All, I'm new to this forum and have a very basic question. How do we establish causality after establishing association? Do we have any...

    Started by shabd_a‎, 05-22-2017 11:29 AM
    • Replies: 10
    • Views: 1,309
    06-08-2017, 02:27 PM Go to last post

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