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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: 196,608
    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: 66,642
    09-30-2005, 09:44 AM Go to last post
  1. How to resolve "the null hypothesis" question?

    Design a decision rule to test the hypothesis that a coin is fair if a sample of 72 tosses of the coin is taken and if a level of significance of...

    Started by daotuan85‎, 04-07-2016 04:33 AM
    • Replies: 0
    • Views: 876
    04-07-2016, 04:33 AM Go to last post
  2. 3 x 2 Repeated measures ANOVA question

    Hello, I'm doing a study in which I'm looking into the effects of three different repeated sprint training modes on performance, whilst also...

    Started by lightwelter‎, 04-06-2016 02:41 PM
    • Replies: 0
    • Views: 1,015
    04-06-2016, 02:41 PM Go to last post
  3. Test similar to Chi-Sqaured?

    I know nothing about statistics but I want to find out if responses to one question in my survey influences responses to another. Unfortunately my...

    Started by Eyak‎, 04-06-2016 02:06 PM
    • Replies: 0
    • Views: 833
    04-06-2016, 02:06 PM Go to last post
  4. Documenting two different statistic outcomes...

    As part of a wider effort / project I am currently trying to figure out if there is a statistically significant difference between the two ear canal...

    Started by se33‎, 04-04-2016 12:29 PM
    • Replies: 1
    • Views: 977
    04-06-2016, 10:27 AM Go to last post
  5. Analysing multiple independent variables (continous and discrete data) using ANOVA

    To provide some context to my question, I have been tasked with identifying features that have an effect on sales for a company. This company owns 6...

    Started by chrish6754‎, 04-06-2016 08:05 AM
    • Replies: 0
    • Views: 957
    04-06-2016, 08:05 AM Go to last post
  6. Is the Null Hypothesis ... ?

    If the alternative hypothesis is mu>13 then what is the null? Is it a) mu<=13 or b) mu=13 I've seen both a) & b) so what's the rationale for...

    Started by mathprof‎, 04-04-2016 06:37 PM
    null hypothesis
    • Replies: 3
    • Views: 1,266
    04-06-2016, 06:14 AM Go to last post
  7. Lightbulb How To Set A Target?

    Hi all, First of all I'm happy being a member of this great forum. I'm a team leader in call centre industry and have some targets that...

    Started by Tarek Abdel Fadeel‎, 04-05-2016 06:11 AM
    • Replies: 1
    • Views: 921
    04-05-2016, 04:26 PM Go to last post
  8. puzzle problem.

    Hello, trying to solve this problem for academic conference we are planning. - Attendees are divided equally into 8 groups (A-H). - Each group...

    Started by experiencetransformation‎, 04-05-2016 01:04 PM
    permutations, stats help
    • Replies: 0
    • Views: 1,104
    04-05-2016, 01:04 PM Go to last post
  9. Two sample t test proof problem

    Can someone please explain the reasoning behind this? Verify that the two sample t test at the level of alpha of H0:ux=uy versus Ha: ux=\uy...

    Started by Blueberrybunny‎, 04-05-2016 03:35 AM
    • Replies: 1
    • Views: 1,329
    04-05-2016, 10:15 AM Go to last post
  10. Statistics with different number of stimuli

    Hy, I must compare three groups with the same size (20 subjects for each group). I administered a test of emotion decoding (the stimuli are photo of...

    Started by matnet‎, 04-05-2016 03:12 AM
    • Replies: 0
    • Views: 917
    04-05-2016, 03:12 AM Go to last post
  11. chi square with percentages

    Hello I have two sample with a very different size (n=42 and n=282) and I only know the percentages of the dependent variable (with 8 levels). ...

    Started by matnet‎, 03-25-2016 07:57 AM
    • Replies: 6
    • Views: 2,251
    04-05-2016, 03:04 AM Go to last post
  12. Indecision about a time series analysis

    Hello people, I would like to ask for you help about my analysis. I explain it briefly : I have daily insect captures from a set of traps located...

    Started by Kjian‎, 04-04-2016 03:36 AM
    • Replies: 2
    • Views: 1,099
    04-05-2016, 02:47 AM Go to last post
  13. Chi-square post hoc?

    Hello I have been researching various options to interpret output for a 3 x 2 chi-square, as although I can confidently determine that my chi-square...

    Started by statto‎, 03-21-2016 12:31 PM
    • Replies: 4
    • Views: 2,635
    04-04-2016, 11:38 AM Go to last post
  14. Subscripts following F-values?

    As part of my masters project, I am required to report F-values to display the main effects of an ANOVA. When going through the relevant literature,...

    Started by lightwelter‎, 04-03-2016 10:41 AM
    • Replies: 2
    • Views: 1,601
    04-04-2016, 07:04 AM Go to last post
  15. 2-Group comparison on proportions?

    I work at a company that has full-time and part-time employees. Sometimes we have to ask people to come to work on a day off. We offer generous...

    Started by Trolle‎, 04-01-2016 02:06 PM
    • Replies: 3
    • Views: 1,625
    04-04-2016, 06:50 AM Go to last post
  16. Compute an asymptotic interval with an approximation (Delta method)

    Dear all, I am performing an analysis where I need to calculate the percent attenuation between two CI (of OR or RR or HR) Essentially, I have a...

    Started by Dusan Petrovic‎, 04-03-2016 07:27 AM
    • Replies: 1
    • Views: 1,504
    04-04-2016, 02:49 AM Go to last post
  17. Priori power calculation

    I'm about to conduct a study as part of my PhD and am a bit confused on my supervisors advice on conducting a priori power calculation to determine...

    Started by lightwelter‎, 04-02-2016 11:18 AM
    • Replies: 4
    • Views: 984
    04-03-2016, 10:10 AM Go to last post
  18. Finding the mean and standard deviation with only percentile data?

    Assuming the data is normal, how do I find the mean and std deviation? I have the following: 10th percentile - 75,174 25th percentile - 81,627...

    Started by jro‎, 04-01-2016 10:39 PM
    • Replies: 3
    • Views: 1,256
    04-02-2016, 07:04 PM Go to last post
  19. Comparing hours worked between two groups

    I am trying to compare the hours worked during a 3 month time frame for two groups of people, male and female. What I want to tell is if there is...

    Started by waffer‎, 03-31-2016 03:57 PM
    • Replies: 1
    • Views: 1,019
    04-01-2016, 06:50 AM Go to last post
  20. Imputing missing values thanks to correlated data ?

    Hello everyone, I'm new here, nice to meet you :) As English is not my native language, I apologise if I'm not always clear, please don't hesitate...

    Started by Kjian‎, 03-14-2016 05:00 AM
    • Replies: 9
    • Views: 1,753
    04-01-2016, 04:26 AM Go to last post
  21. Chi squared

    I am measuring if a number of different parameters of two populations changed with time Male (24 changed, 13 did not change) Female (32 changed, 5...

    Started by jsmith613‎, 03-31-2016 02:51 PM
    • Replies: 4
    • Views: 1,596
    04-01-2016, 04:15 AM Go to last post
  22. f distribution

    I've wrote some things down but I'm unsure of what to do next. Can anyone help stir me in the right direction? I've provided how I got the value...

    Started by asilvester635‎, 03-31-2016 01:53 PM
    • Replies: 1
    • Views: 1,542
    03-31-2016, 01:59 PM Go to last post
  23. Normal distribution

    Hi guys, I'm a newbie here. My question is the following. Are the following set of values normally distributed? 26, 33, 65, 28, 34, 55, 25,...

    Started by narayanan‎, 03-29-2016 03:24 AM
    • Replies: 7
    • Views: 2,496
    03-30-2016, 07:22 PM Go to last post
  24. What stat test to use when comparing against a control?

    Hey guys, I've done an experiment where a participant ingested alcohol and did reaction time tests (every 15 minutes while it was eliminated). I...

    Started by Maluras‎, 03-28-2016 10:43 PM
    • Replies: 2
    • Views: 1,427
    03-30-2016, 03:53 PM Go to last post
  25. Confidence Interval

    The equation for the relationship between the amount of body fat (Y ) to 3 predictors, which are triceps skinfold thickness (X1), thigh circumference...

    Started by eunkum‎, 03-30-2016 03:37 PM
    • Replies: 0
    • Views: 763
    03-30-2016, 03:37 PM Go to last post
  26. Effect size for ANCOVA?

    Hi everyone, Maybe I'm not looking in the right places, but I'm having a really hard time finding out how to do an effect size for ANCOVA in...

    Started by DefenceDoom‎, 03-28-2016 04:31 PM
    • Replies: 2
    • Views: 987
    03-30-2016, 11:49 AM Go to last post
  27. how to forcast sales data(other techniques besides moving averages?)

    I'm new to the idea of forcasting, so want to get some inputs as I'm just experimenting with the data and going through a beginners book. I have...

    Started by semidevil‎, 03-29-2016 04:47 PM
    • Replies: 1
    • Views: 932
    03-29-2016, 05:20 PM Go to last post
  28. What figures to report and which tool to use?

    Dear All I asked 200 people a multiple-choice question with four possible answer options and received the following responses: Option A: 2...

    Started by Remster‎, 03-29-2016 04:48 AM
    • Replies: 0
    • Views: 762
    03-29-2016, 04:48 AM Go to last post
  29. Factor analysis completed but shows diff factors in subscales to authors

    hi there I have conducted a factor analysis (well I think I did this correctly - that could be another question) as per the author/creator of a...

    Started by Twilsoncrow‎, 03-28-2016 06:39 PM
    • Replies: 0
    • Views: 828
    03-28-2016, 06:39 PM Go to last post
  30. Red face What stat test to perform on non-parametric nominal data between several groups

    Hi everyone :wave: I hope this is the right forum for this thread. Anyways, I'll cut the chase: I need to assess statistical differences of...

    Started by redbull02‎, 03-28-2016 03:43 PM
    independent variables, nominal data analysis, non-parametric test
    • Replies: 0
    • Views: 864
    03-28-2016, 03:43 PM Go to last post
  31. Very high coefficents and odds ratios

    Hello, I have conducted a logistic regression and the results are for me a bit surprising. As you can see in attachement, I have seven...

    Started by russel2000‎, 03-26-2016 09:02 AM
    • Replies: 4
    • Views: 1,809
    03-28-2016, 03:20 PM Go to last post
  32. naive questions

    Hi, I am currently learning Machine Learning. I have couple of questions. 1.)what is the difference between statistical models and machine learning...

    Started by chakravarty456‎, 03-28-2016 05:40 AM
    • Replies: 2
    • Views: 1,727
    03-28-2016, 11:19 AM Go to last post
  33. Handle questionnaires/survey data

    Hi! How do I best take care of survey data, in Excel or SPSS? Let´s say I have a questionnaire with 15 questions (3 background variables: gender,...

    Started by Jonix‎, 03-27-2016 07:31 AM
    • Replies: 4
    • Views: 1,994
    03-27-2016, 06:27 PM Go to last post
  34. Logistic regression interpretation for an idiot

    Hi. I'm not a statistician.... more of an statistidiot. I have been trying for some time to understand logistic regression interpretation but am...

    Started by Toivo‎, 11-15-2015 05:06 PM
    • Replies: 9
    • Views: 1,587
    03-26-2016, 07:37 AM Go to last post
  35. Question K-means++ Question

    What is set X of input instances for K-means++ with the following property? For any p > 0 there is a set of points x ∈ X such that K-means++ with...

    Started by bbman2007‎, 03-26-2016 12:17 AM
    k-means++
    • Replies: 0
    • Views: 1,124
    03-26-2016, 12:17 AM Go to last post
  36. What do I do when the chi-square assumption is violated

    Hello, I am looking at data to see if there is a correlation between an Independent nominal variable (3 level) and a hypothesized dependent...

    Started by greathl21‎, 01-22-2016 02:30 PM
    • Replies: 3
    • Views: 4,030
    03-25-2016, 05:43 PM Go to last post
  37. is this difference significant?

    Hello! I'm new to this forum, so I'm not sure if this question is a silly one. I'm on a team at work that is using an employee satisfaction survey to...

    Started by jimmytwotimes‎, 03-18-2016 10:31 AM
    • Replies: 3
    • Views: 1,513
    03-25-2016, 04:06 PM Go to last post
  38. Contradiction: '‘Estimation of fixed effects’ vs ‘Type III test fixed effects'?

    Hi there, I’m trying to evaluate if there is an effect of a treatment (3 levels) on coffee plants height over 10 different periods of time. Plants...

    Started by Libellule‎, 03-25-2016 11:04 AM
    mixed model
    • Replies: 0
    • Views: 1,895
    03-25-2016, 11:04 AM Go to last post
  39. How to plot market risk premium and stock risk premium on SPSS

    Sorry, but I am totally new on SPSS. I have a homework where I am supposed to plot (from a data set) the market risk premium and a stock's risk...

    Started by Sanchesos‎, 03-25-2016 08:09 AM
    • Replies: 0
    • Views: 1,344
    03-25-2016, 08:09 AM Go to last post
  40. Stats hw help please

    Below are a group of numbers that represent given vote counts from an election: 31 132 8550 17 10 2270 55 1492

    Started by capranica‎, 03-23-2016 11:51 PM
    • Replies: 0
    • Views: 905
    03-23-2016, 11:51 PM Go to last post
  41. Mad = 0

    Hello, I'm trying to use Median Absolute Deviation as a way of determining outliers using this article as a guide. ...

    Started by theroro‎, 03-22-2016 04:08 PM
    mad
    • Replies: 5
    • Views: 1,935
    03-23-2016, 10:50 PM Go to last post
  42. Z Test or Chi2?

    Hi, I have a difficulty rationalising which test to use and would appreciate any advise here! Thanks a million in advance! Basically, i have 2...

    Started by nec‎, 03-22-2016 06:27 PM
    • Replies: 4
    • Views: 1,204
    03-22-2016, 07:51 PM Go to last post
  43. The Central Limit Theorem

    The image contains the problems and the solution. In the calculation, 0.027, which is the difference between the mew and the x-bar changed from 0.027...

    Started by asilvester635‎, 03-22-2016 01:50 PM
    • Replies: 1
    • Views: 1,485
    03-22-2016, 02:39 PM Go to last post
  44. 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: 2,602
    03-22-2016, 02:06 PM Go to last post
  45. What kind of statistical method to use?

    Good day, I have plenty of summed calls from patients. They summed by month from 2010 to 2014 year. Patients are man or woman only (as...

    Started by tim999‎, 03-22-2016 09:38 AM
    • Replies: 0
    • Views: 975
    03-22-2016, 09:38 AM Go to last post
  46. Ranking

    Hi Can someone help me! I have two sets of data one is the total cost and other is units of activity e.g Total cost. ...

    Started by Bakerwe3‎, 03-22-2016 02:04 AM
    • Replies: 0
    • Views: 897
    03-22-2016, 02:04 AM Go to last post
  47. Regression

    Hi there, I'm exploring the relationship between GDP/capita and voter turnout in European countries. I have looked at Pearson's correlation...

    Started by markhowe‎, 03-21-2016 02:32 PM
    • Replies: 0
    • Views: 1,229
    03-21-2016, 02:32 PM Go to last post
  48. Creating a statistical dataset within specified parameters

    Hi, Got an assignment due this week and stumped on this one question: I need a dataset: x = −5, s = 1, g = 0 and k = 0 Where x= mean,...

    Started by needstatshelpover‎, 03-21-2016 08:35 AM
    • Replies: 1
    • Views: 2,001
    03-21-2016, 08:44 AM Go to last post
  49. Statistical testing for part of total return

    Hey guys, I am doing an M&A event study, where I've distinguished two types of mergers. As a next step, I have calculated the total return following...

    Started by Vend1301‎, 03-20-2016 05:29 PM
    • Replies: 0
    • Views: 1,200
    03-20-2016, 05:29 PM Go to last post
  50. i need help in some research work.

    i need to write some research paper i need help in that matter can someone please help topic is Analysis of Variance in Normality ( based on...

    Started by malko‎, 03-01-2016 11:08 AM
    • Replies: 5
    • Views: 2,170
    03-20-2016, 11:43 AM Go to last post
  51. 25th percentile of right-skewed and left-skewed distribution

    Hi All, Is it possible to have two lists of numbers with the same number of elements and same average, where one has a left-skewed distribution and...

    Started by atoga‎, 03-19-2016 04:52 PM
    distribution, percentile, skewed distribution
    • Replies: 0
    • Views: 1,193
    03-19-2016, 04:52 PM Go to last post
  52. Which test to use for testing normality?

    Hi, I need to help to choice of test for normality. I have a really large dataset which contain aproximately 180 000 observations and 5 variables...

    Started by russel2000‎, 03-19-2016 12:44 PM
    • Replies: 5
    • Views: 1,777
    03-19-2016, 03:16 PM Go to last post
  53. Z-Confidence Interval Procedure

    Say we are trying to estimate a population mean by using a confidence interval when the population standard deviation is known, hence a Z interval...

    Started by StilloftheNight‎, 03-19-2016 10:50 AM
    • Replies: 1
    • Views: 1,294
    03-19-2016, 11:27 AM Go to last post
  54. sawtooth crash pattern detection

    I am working on some gaming playing data, and want to detect the sawtooth crash pattern (which means the player has a sharp drop in gaming wager...

    Started by fengyuwuzu‎, 03-18-2016 11:16 AM
    • Replies: 1
    • Views: 1,180
    03-18-2016, 10:55 PM Go to last post
  55. Reverse Scoring in SPSS

    Hi! I'm currently doing data analysis on a study I've had to conduct for my degree coursework. We've used 2 questionnaires and I will be doing a...

    Started by coopa025‎, 03-18-2016 09:47 AM
    reverse scoring, statistics
    • Replies: 0
    • Views: 2,935
    03-18-2016, 09:47 AM Go to last post
  56. 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: 1,997
    03-18-2016, 09:42 AM Go to last post
  57. Probability formula quiz

    Which of the 24 formulae below represents the probability that all k genes are mutant in at least 1 person, where: n = number of people (sample...

    Started by KelvinS‎, 03-17-2016 07:24 PM
    • Replies: 3
    • Views: 1,386
    03-17-2016, 07:47 PM Go to last post
  58. Power of Two (Ordering Policy)?

    The optimal time between replenishments, T*, is found to be 5.9 weeks. Using a week as a base unit of time and following the Power of Two Policy,...

    Started by cassidy328‎, 03-17-2016 02:34 PM
    • Replies: 0
    • Views: 3,231
    03-17-2016, 02:34 PM Go to last post
  59. What would you classify an "operational decision" for a DC?

    You run a distribution center that distributes different brands of cell phones to retailers in the area. You need to tackle inventory decisions that...

    Started by cassidy328‎, 03-17-2016 01:39 PM
    • Replies: 2
    • Views: 1,632
    03-17-2016, 02:26 PM Go to last post
  60. Unique Solution.

    Is the following statement true that : "To get unique solution of each parameter in a model, number of equations must be greater than or equal to...

    Started by Cynderella‎, 03-17-2016 12:36 AM
    factorial analysis, mle, system of equations
    • Replies: 1
    • Views: 1,289
    03-17-2016, 02:13 AM Go to last post

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