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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: 200,178
    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: 68,457
    09-30-2005, 09:44 AM Go to last post
  1. Choosing prior for the regression coefficients in the logistic regression

    I'm trying to model Bayesian logistic regression model (using JAGS in R) with my dependent variable (status: 0=alive, 1 death) & independent variable...

    Started by diyana‎, 09-24-2017 03:50 AM
    categorical variable, dirichlet distribution, logistic regression, normal distribution, prior distribution
    • Replies: 2
    • Views: 173
    09-26-2017, 08:46 AM Go to last post
  2. 90% Confidence Problem

    This is the question I am struggling with, it is from a set of practice questions but I am trying to understand how to do this for my upcoming exams,...

    Started by CateB9‎, 09-25-2017 05:49 AM
    • Replies: 1
    • Views: 282
    09-25-2017, 02:38 PM Go to last post
  3. Defect Rates

    I have two sample sizes with different defect rates because of the size differences. I need a way, preferably in Excel, to determine if the defect...

    Started by Compliance Carl‎, 09-19-2017 08:22 AM
    • Replies: 6
    • Views: 414
    09-25-2017, 07:37 AM Go to last post
  4. How do i calculate sample mean values given μ, σ, n and alpha?

    If I'm given a population mean and sd, how can I calculate a sample mean that encloses a central distribution of means for certain values of n and...

    Started by drrobert8085‎, 09-24-2017 10:43 PM
    • Replies: 0
    • Views: 241
    09-24-2017, 10:43 PM Go to last post
  5. Help - How do you calculate Z scores given mean and standard deviation?

    I need to calculate z(obs) when given mean and standard deviation from a population and one sample, as in μ0 =32, σ0 =10, m=27, and n=25, assuming...

    Started by drrobert8085‎, 09-24-2017 06:55 PM
    z score
    • Replies: 2
    • Views: 227
    09-24-2017, 10:07 PM Go to last post
  6. Cool Summation Algebra

    Hi guys, new member :D: Here is the question I'm having trouble with: I was having trouble with this as I haven't taken stats in years....

    Started by bronzestudent‎, 09-24-2017 02:24 PM
    • Replies: 0
    • Views: 396
    09-24-2017, 02:24 PM Go to last post
  7. Should I use chi squared to test these observed vs expected ratios?

    I'm doing a study about the height:radius ratios of limpets on exposed and sheltered shores (The ratio is calculated by dividing height by radius)....

    Started by Little.fish‎, 09-22-2017 10:53 AM
    • Replies: 2
    • Views: 268
    09-24-2017, 06:04 AM Go to last post
  8. Sample mean differs from population mean due to weighting

    Hi folks, The disclaimer first: I'm not primarily trained in statistics, so this problem might sound very naive to the experienced statisticians....

    Started by rsindore‎, 09-15-2017 02:53 AM
    distribution, per capita consumption, weighting
    • Replies: 5
    • Views: 407
    09-22-2017, 06:48 PM Go to last post
  9. 2 Sample Distribute

    ROA is an indicator how profitable a company Is relative to its assets. Note: I know I haven't given the dataset.

    Started by vernonicamexie‎, 09-22-2017 06:06 PM
    statistic test, stats help, two sample distribute
    • Replies: 1
    • Views: 234
    09-22-2017, 06:17 PM Go to last post
  10. Should you use a dependent t-test to measure difference across time?

    Is it proper to use dependent t-test to measure difference across time for scores IF the participants are different people? Although they are...

    Started by feignfeign‎, 09-21-2017 02:57 PM
    • Replies: 5
    • Views: 339
    09-22-2017, 05:58 PM Go to last post
  11. How do I calculate the variance of the ratio of two independent variables?

    If I have two independent variables (say X and Y) with their respective variances (or standard deviation), how could I calculate the mean and...

    Started by Youcef_1985‎, 09-22-2017 09:36 AM
    • Replies: 1
    • Views: 219
    09-22-2017, 09:39 AM Go to last post
  12. Comparing methods of standardising variables

    I have count data of the number scattered photons detected at various wavelengths. The data is collected under different conditions, so it is normal...

    Started by Prometheus‎, 09-21-2017 06:14 AM
    • Replies: 4
    • Views: 312
    09-22-2017, 05:43 AM Go to last post
  13. Question How do I pose a hypothesis for a partial correlation?

    Hello everyone, in my thesis I have following hypothesis: 3a: Internet skills are positively correlated with the frequency of experiencing risks...

    Started by doenerys‎, 09-22-2017 02:01 AM
    hypothesis, mediation, partial correlation
    • Replies: 0
    • Views: 214
    09-22-2017, 02:01 AM Go to last post
  14. Lightbulb Statistical Method Help!

    I have a set of data that I would like to test a hypothesis against (H0: Mean Difference = 0 vs. H1: Mean Difference <> 0). I have a time 1 and time...

    Started by nmielke‎, 09-20-2017 03:46 PM
    wilcoxon signed-rank test
    • Replies: 1
    • Views: 222
    09-21-2017, 08:08 AM Go to last post
  15. Help needed in SPSS

    Hello ! With a friend, we have a paper to write about the fail of measures to counter the illegal downloading of music in our country, for that...

    Started by Anabelle‎, 09-15-2017 06:19 AM
    • Replies: 5
    • Views: 446
    09-21-2017, 06:41 AM Go to last post
  16. Statistical test and error bars?

    Hi! I'm completely new to statistics so I'm a bit stuck! I'v been treating 4 groups of human cells (all originally from the same batch) with...

    Started by ilikthebred‎, 09-20-2017 11:46 AM
    • Replies: 1
    • Views: 216
    09-20-2017, 02:38 PM Go to last post
  17. Beginner Stats: which t-test should I use for these scenarios?

    I have been asked to run t-tests in a dataset for the following two scenarios: 1. Test whether people with a masters degree watch less television...

    Started by groverdot‎, 09-19-2017 06:29 PM
    • Replies: 3
    • Views: 282
    09-20-2017, 10:26 AM Go to last post
  18. Comparing tallies of win streaks of different lengths

    I'm not sure of the correct terminology for explaining my question, so please bear with me. Suppose I have a random event with a binary outcome...

    Started by Jennifer Murphy‎, 09-19-2017 10:01 PM
    • Replies: 2
    • Views: 229
    09-20-2017, 09:46 AM Go to last post
  19. Question Is it possible to create live anova table for excel

    Hi, I am chemist and running laboratory with more than 200 parameters. For all parameters, my team make 15*2 to 5(no of anayst) analysis to...

    Started by therdem‎, 09-17-2017 06:48 AM
    • Replies: 1
    • Views: 275
    09-17-2017, 02:59 PM Go to last post
  20. From variance to 95% confidence interval: Is this done right?

    Hello I have a forest inventory project where I am trying to estimate the total forest wood volume (in cubic feet) with a 95% confidence...

    Started by Acer Lambada‎, 09-12-2017 03:29 PM
    • Replies: 4
    • Views: 506
    09-13-2017, 05:39 PM Go to last post
  21. Central Limit Theorem Indicative of Underlying Distribution?

    Hi All, I've been reading threads off and on for a couple days, and I can't get a good feel for how to answer this question I've got stuck in my...

    Started by bensie‎, 09-08-2017 06:54 PM
    central limit theorem, prediction model, sample distribution, sample size, underlying distribution
    • Replies: 4
    • Views: 434
    09-13-2017, 12:23 PM Go to last post
  22. Bias

    I know only one definition of bias in statistics: the expected difference between the estimator and the parameter. Are there any alternative...

    Started by Anttila‎, 09-13-2017 07:25 AM
    • Replies: 3
    • Views: 313
    09-13-2017, 09:43 AM Go to last post
  23. Which statistical test to use?

    Hi everyone, we ran a within-subjects user study with three different independent variables (A, B, and C). We measured e.g. task completion times...

    Started by John_100‎, 09-10-2017 08:45 AM
    • Replies: 1
    • Views: 411
    09-11-2017, 04:14 PM Go to last post
  24. Probability and Statistics

    This a problem set of a friend of mine. 1. A shipment of 12 calculators contains 3 defective calculators. In how many ways can a school purchase 5...

    Started by Gladys Grace‎, 07-14-2013 07:48 PM
    • Replies: 1
    • Views: 2,076
    09-10-2017, 02:07 PM Go to last post
  25. 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: 626
    09-09-2017, 12:38 PM Go to last post
  26. Multinomial Logistic Regression, 2x2 Between Participants Design

    Hello everyone, I would really appreciate some advice on how to interpret my SPSS-Output. I have tried to figure it out myself, but haven't been...

    Started by lost_in_stats‎, 09-06-2017 04:27 PM
    • Replies: 4
    • Views: 421
    09-09-2017, 08:46 AM Go to last post
  27. Discriminating Power

    Hi, I am working on the discriminating power of a test result of a class. I have only searched the internet and youtube to learn more about this. ...

    Started by patternation‎, 09-09-2017 07:08 AM
    • Replies: 0
    • Views: 280
    09-09-2017, 07:08 AM Go to last post
  28. Confusion between z and t values

    Hi, Alright so I have some confusion on when to use specific tests and the z vs t test. Given this example (not my homework) could someone please...

    Started by Rifscape‎, 09-07-2017 11:51 PM
    confidence interval, hypotheis test, sample mean and variance, t value, z value
    • Replies: 1
    • Views: 325
    09-08-2017, 06:51 AM Go to last post
  29. Which test to use to compare data sets with a small sample size?

    So I have several data sets, but each data set consists of only 7 values. I know some of the data sets are non-normal distributed (or at least I did...

    Started by DenverDang‎, 09-07-2017 06:14 AM
    • Replies: 6
    • Views: 315
    09-08-2017, 04:23 AM Go to last post
  30. Path analysis, mediational model (including repeated measures)?

    Hello, everyone! I am having an interesting research question but unfortunately, I cannot come up with the right statistical model to test it. I...

    Started by Lukas123‎, 09-07-2017 01:33 PM
    • Replies: 3
    • Views: 281
    09-07-2017, 09:08 PM Go to last post
  31. Repeated measures ANOVA but non parametric & missing values

    I am trying to compare a matched cohort of repeated measures (continuous variables) - within each treatment arm with 5 time points comparing to...

    Started by lyncra‎, 09-06-2017 02:36 PM
    • Replies: 3
    • Views: 304
    09-07-2017, 09:34 AM Go to last post
  32. Question Analyzing skewed data, how to determine % spread and variation? Testing method error

    Hello everyone, I'm trying to determine the overall error of a measurement method by comparing it to the true value. I have a set of data which...

    Started by Prostocat‎, 08-31-2017 02:40 PM
    measurement error
    • Replies: 9
    • Views: 556
    09-06-2017, 11:47 PM Go to last post
  33. How to test if gender impacts mortality rates when already considering age

    Hi, I am currently working on a research project where I'm analysing the impact of different factors on mortality. I have the past 10 years of...

    Started by Mary12‎, 09-06-2017 01:32 PM
    mortality, multivariate, p value, test of difference, test of significance
    • Replies: 4
    • Views: 551
    09-06-2017, 04:12 PM Go to last post
  34. 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: 452
    09-06-2017, 03:09 PM Go to last post
  35. Post Making a Hypothesis test for independent and dependent variables

    Hello I have trouble on making the hypothesis test(especially making a Null hypothesis), I have tried all the calculating process but still...

    Started by minhpro2611997‎, 09-04-2017 06:54 AM
    • Replies: 0
    • Views: 275
    09-04-2017, 06:54 AM Go to last post
  36. ANOVA on different metrics

    Hi everyone! Hoping you can help me with a question. I am doing a paper for university. I did a test on a group of people so as to measure their...

    Started by pmcarosella‎, 09-03-2017 09:15 AM
    • Replies: 3
    • Views: 384
    09-03-2017, 02:28 PM Go to last post
  37. Comparing three metrics statistics

    Hi there, I am doing an analysis on the time it took for a group to do the same task on three different websites. I got the time it took on each...

    Started by pmcarosella‎, 09-03-2017 10:28 AM
    • Replies: 0
    • Views: 269
    09-03-2017, 10:28 AM Go to last post
  38. Whether to use z test or t test

    hi team, I got the following question given below. According to me this should be solved using z test as the sample size is more than 30. But they...

    Started by simisreedharan‎, 08-31-2017 02:18 AM
    hypothesis test, t test, z test
    • Replies: 5
    • Views: 436
    08-31-2017, 11:02 AM Go to last post
  39. 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: 641
    08-31-2017, 10:56 AM Go to last post
  40. What is the reason behind getting unbiased and efficient estimator by ranked set samp

    In ranked set sampling (RSS), we select n random sets, each of size n. Then we choose the largest unit from the 1st set, 2nd largest from the 2nd...

    Started by user1234‎, 08-31-2017 08:56 AM
    rank order data analysis, rank-order data, ranking, sampling
    • Replies: 4
    • Views: 297
    08-31-2017, 10:41 AM Go to last post
  41. Post Forming a null and alternative hypothesis and then testing it.

    I am given the following data: Observation Wage 1 $8.75 2 $10.00 3 $10.25 4 $6.50 5 $15.00 6 $10.00 7 $8.00

    Started by nelsonschrader‎, 08-30-2017 08:22 AM
    alternative, homework, null, significane
    • Replies: 6
    • Views: 372
    08-30-2017, 07:01 PM Go to last post
  42. I need help figuring out type of analysis for duration of therapy and adverse outcome

    Hi everyone, I have a prospective cohort of 90 subjects who were previously on drug X (duration of drug X = "varx"), now on drug Y and followed...

    Started by blocksteady‎, 08-28-2017 04:13 PM
    • Replies: 9
    • Views: 472
    08-29-2017, 02:36 PM Go to last post
  43. Question Urgent!

    Hello there :) It's probably really straight forward but I'm having a very hard time trying to find a relationship between variables. I have an...

    Started by BrainyO‎, 08-27-2017 11:47 AM
    brainfart, correlation, statistics
    • Replies: 1
    • Views: 391
    08-28-2017, 10:36 AM Go to last post
  44. Post URGENT! Reviewing SPSS output

    Hi guys, I'm needing help with figuring out my results for logistic regression, I have to get this in to my supervisor in 6 hours and I'm freaking...

    Started by Serena‎, 08-26-2017 09:12 PM
    logistic regression, statistics, urgent
    • Replies: 3
    • Views: 637
    08-27-2017, 05:44 PM Go to last post
  45. which model to use? Help for newbie

    Hello! I am trying to determine which model would be best to use to solve the following problem. I am looking at the occurrence of patient to patient...

    Started by kate062127‎, 08-25-2017 12:06 PM
    • Replies: 2
    • Views: 556
    08-25-2017, 02:05 PM Go to last post
  46. Help please - what tests do I need to do?

    Hi, I'm struggling to figure out which tests I need to do for my project. I have two things I need to do. 1) I need to know whether males and...

    Started by bobolococo234‎, 08-25-2017 04:31 AM
    • Replies: 4
    • Views: 620
    08-25-2017, 01:11 PM Go to last post
  47. Help!! to analyse the data using statistics

    hi everyone!!i need to explain statistics model in my assignment and i have no idea about statistics. i have been going thorough all those model...

    Started by deadhunter‎, 08-24-2017 04:45 AM
    statisitcs help needed
    • Replies: 1
    • Views: 434
    08-24-2017, 10:17 AM Go to last post
  48. Explaining Variation in the Simple Linear Regression Model

    For one data point, how can the variation explained by the regression line exceed the total variation? Here the blue line represents the mean of...

    Started by StilloftheNight‎, 08-21-2017 05:32 AM
    • Replies: 3
    • Views: 362
    08-23-2017, 07:52 PM Go to last post
  49. one way ANOVA

    I have a question as well.. In a one way - analysis of variance, when the in - between variance is high and the within variance is low, how would...

    Started by Emilyb0511‎, 08-22-2017 11:27 AM
    • Replies: 1
    • Views: 406
    08-23-2017, 04:32 AM Go to last post
  50. Inter-assay variability

    Hi everyone, I am currently working on my MSc thesis and have talked myself around in circles and have gotten completely lost. I am trying to...

    Started by stacey_b‎, 08-22-2017 02:16 PM
    • Replies: 0
    • Views: 791
    08-22-2017, 02:16 PM Go to last post
  51. general Question

    Hi Guys, I have a question regarding my upcoming exam. I am practising with Multiple Choice questions. There is one question that confuses me: ...

    Started by Emilyb0511‎, 08-20-2017 07:07 AM
    • Replies: 2
    • Views: 373
    08-22-2017, 11:23 AM Go to last post
  52. Sample Size Calculation

    Hi, New to the stats so apologies in advance. Is it possible to use a sample size calculation to find the delta to determine if values from...

    Started by Tim_1‎, 08-21-2017 12:30 PM
    • Replies: 2
    • Views: 367
    08-21-2017, 05:24 PM Go to last post
  53. Talking spss and likert scale

    Hi,wondering if you can help. I am using a likert scale which does not give much information as to how to analyse the score. In theory, the...

    Started by p160‎, 08-20-2017 03:42 PM
    likert scale analysis, spss
    • Replies: 1
    • Views: 387
    08-20-2017, 06:02 PM Go to last post
  54. Sampling Distribution

    Hi Guys, I hope you can help me out to figure what I am doing wrong... I have the answer to the exercise and I don't get how I find something...

    Started by Aminalek‎, 08-20-2017 05:53 AM
    • Replies: 0
    • Views: 241
    08-20-2017, 05:53 AM Go to last post
  55. Reject or Accept?

    I am a student in my 2nd year of university studying marine biology and doing a retake this Tuesday - sadly none of the answers for the past papers...

    Started by bryonycostello‎, 08-19-2017 10:07 AM
    • Replies: 0
    • Views: 296
    08-19-2017, 10:07 AM Go to last post
  56. Question How is this calculated

    On page 128 there is a table showing how much 'life misery' can be reduced by eliminating different issues - such as poverty and mental illness. But...

    Started by Birkjaer‎, 08-18-2017 02:19 AM
    • Replies: 1
    • Views: 491
    08-18-2017, 07:54 AM Go to last post
  57. Question Post-hoc power analysis for a Welch ANOVA and also a Kruskal-Wallis test.

    I planned to analyse some data with several ANOVAs (I have many different dependent variables), but much of the data violates the ANOVA assumptions,...

    Started by ble_21‎, 08-16-2017 10:31 AM
    eta squared, kruskal wallis, omega squared, power, welch
    • Replies: 7
    • Views: 510
    08-18-2017, 05:52 AM Go to last post
  58. Testing assymetry between 2 models with F-test

    Hello, I would like to know whether it is acceptable to use a general linear F-test, supposed to compare two models (a full model and a restricted...

    Started by naelwing‎, 08-18-2017 02:11 AM
    • Replies: 1
    • Views: 462
    08-18-2017, 03:08 AM Go to last post
  59. Species abundance statistical comparison assistance

    Hi, I am new to statistics and needing to apply a relevant statistical test to the following question: Is the presence/abundance of species X...

    Started by Tam_123‎, 08-16-2017 08:28 PM
    • Replies: 2
    • Views: 386
    08-17-2017, 06:15 AM Go to last post
  60. Name Research: Between and Within Subjects

    First time poster here, trying to remember stats from grad school 10 years ago. I'm running a naming survey with 20 names and 1600 respondents. I...

    Started by Yaro‎, 08-16-2017 03:20 PM
    • Replies: 1
    • Views: 334
    08-16-2017, 05:11 PM Go to last post

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