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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. 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: 66,829
    09-30-2005, 09:44 AM Go to last post
  2. 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: 196,909
    07-16-2014, 11:01 AM Go to last post
  1. Talking ANOVA and Chi Square Questions! Please Help! :)

    Can you please help me figure out if the following questions are ANOVA or Chi Square? I have completed them to what I think is right, but I am not...

    Started by alexis747‎, 03-17-2009 06:21 PM
    • Replies: 5
    • Views: 4,763
    03-17-2009, 10:14 PM Go to last post
  2. Dependent and Independent Variables...Please help! :)

    Never mind, I got help, thanks anyways.

    Started by alexis747‎, 03-21-2009 10:58 PM
    • Replies: 0
    • Views: 2,531
    03-21-2009, 10:58 PM Go to last post
  3. Regression Questions!

    Hello everyone! I have a couple of questions regarding regression!! How would you plot a regression line on a graph with only: i. y-intercept...

    Started by alexis747‎, 03-23-2009 08:51 PM
    • Replies: 0
    • Views: 2,426
    03-23-2009, 08:51 PM Go to last post
  4. Quick Multiple Choice Question! :) Can I have your opinion Please?

    My question is: Which of the following is true of the correlation coefficient (r)? a) It has units of both x and y (I know this one is incorrect...

    Started by alexis747‎, 03-24-2009 06:49 PM
    • Replies: 1
    • Views: 2,308
    03-24-2009, 07:08 PM Go to last post
  5. Red face Tips for Differentiating Between Tests! Please! :)

    Hello! I have my final exam for my statistics course this week (Tuesday) and for one section we are required to differentiate between the...

    Started by alexis747‎, 04-12-2009 02:52 PM
    • Replies: 1
    • Views: 2,105
    04-13-2009, 05:48 PM Go to last post
  6. Need help on this easy problem?

    In July 1994 and again in April 2005, the Gallup Poll asked separate random samples of 1015 adults about their opinions on working parents. The table...

    Started by alexk‎, 04-28-2011 06:39 AM
    • Replies: 1
    • Views: 4,053
    04-28-2011, 01:09 PM Go to last post
  7. What should my next step be?

    Here's the problem, I know it's a linear regression t test for slope, but I'm stuck on how to get it started. Here's the data: Researchers at the...

    Started by alexk‎, 04-28-2011 07:57 PM
    • Replies: 2
    • Views: 2,633
    04-28-2011, 08:41 PM Go to last post
  8. Smile Combined salary

    Hi! There is a problem: The following computer output comes from weekly salary information for a small company. Gender N Min Q1...

    Started by AlexKom‎, 11-23-2005 04:55 PM
    • Replies: 2
    • Views: 4,470
    11-23-2005, 07:50 PM Go to last post
  9. Red face A basketball team problem

    Hello! Please help me in this problem: A basketball team with 11 players of different heights trades its shortest player to another team for a...

    Started by AlexKom‎, 11-23-2005 12:02 AM
    • Replies: 1
    • Views: 4,689
    11-23-2005, 12:14 AM Go to last post
  10. Arrow What re-expression to use?

    Hello! I) I can't understand, how can I determine what re-expression to use in order to linearize the scatterplot by just looking at the...

    Started by AlexKom‎, 11-24-2005 09:46 PM
    • Replies: 1
    • Views: 3,077
    11-27-2005, 07:50 PM Go to last post
  11. Randomization

    Hello! There is a problem: Which of the following sources of bias is eliminated by randomization? a) Researchers have a desired outcome in...

    Started by AlexKom‎, 11-25-2005 11:36 PM
    • Replies: 1
    • Views: 3,695
    11-26-2005, 12:08 AM Go to last post
  12. 1970 Draft Lottery

    And also I have a trouble with this: Based on the box plots, which statement is correct? a) There seems to be no relationship between birth month...

    Started by AlexKom‎, 11-25-2005 11:51 PM
    • Replies: 1
    • Views: 4,699
    11-26-2005, 12:12 AM Go to last post
  13. Transforming the data

    Hello! I can't understand: In order to transform the data to make it appear more linear, how can I choose what transformation to use, if I don't...

    Started by AlexKom‎, 11-27-2005 12:05 PM
    • Replies: 8
    • Views: 5,023
    11-27-2005, 10:40 PM Go to last post
  14. Experiment

    Hello! I have a question: In the experiment I have 4 treatments: 1)regular wash cycle/cold water 2)Delicate wash cycle/hot water 3)Regular/hot...

    Started by AlexKom‎, 11-30-2005 06:17 PM
    • Replies: 1
    • Views: 2,910
    11-30-2005, 06:20 PM Go to last post
  15. The confidence interval

    I have a question: I am confused, What is the confidence interval?

    Started by AlexKom‎, 11-30-2005 06:46 PM
    • Replies: 1
    • Views: 2,531
    11-30-2005, 08:42 PM Go to last post
  16. Smile Multiple Choice Question

    Hello! Here is the problem: A group of eight people work on the 5th floor of the building.They all decide they want to lose weight by...

    Started by AlexKom‎, 12-10-2005 08:09 PM
    • Replies: 4
    • Views: 13,493
    12-10-2005, 09:25 PM Go to last post
  17. Multiple choice

    Hello, I have some questions: A researcher wants to determine the mean income of adults in a particular state. She decides to tae a random sample...

    Started by AlexKom‎, 01-12-2006 11:11 PM
    • Replies: 4
    • Views: 8,539
    01-13-2006, 08:47 AM Go to last post
  18. Histogram

    Hello, I have a question: What obvious information do histograms give. For example, I know that scatterplots show the strength and the direction...

    Started by AlexKom‎, 03-27-2006 11:23 PM
    • Replies: 6
    • Views: 4,384
    07-31-2014, 11:54 AM Go to last post
  19. Test of Significance

    Hello, I performed a small experiment for my biology class, where I compared pulse rate after running on 2 legs, and pulse rate after running on 4...

    Started by AlexKom‎, 12-16-2006 02:04 PM
    • Replies: 3
    • Views: 2,596
    12-20-2006, 05:08 PM Go to last post
  20. Question Stanine calculation

    Hey all, I have been trying to solve this problem without success, thus I'm calling for Help :( Problem: There are 103 Italian provinces ranked...

    Started by AlexM‎, 01-29-2006 09:34 AM
    • Replies: 3
    • Views: 6,436
    01-29-2006, 12:28 PM Go to last post
  21. Question regarding log transformations.

    I am doing a statistics project for my class and the question reads as follows: "Fit a linear model that could be used to answer whether or not a...

    Started by alexparij‎, 11-11-2012 06:26 PM
    • Replies: 1
    • Views: 1,414
    11-17-2012, 06:46 PM Go to last post
  22. Data Extrapolation for SEM

    Hi, I have a data of n=50. Is there any way in which I can extrapolate or simulate the data to n=2000, in order to carry out Structural equation...

    Started by alexpjoy‎, 08-17-2016 05:56 AM
    • Replies: 4
    • Views: 1,567
    09-07-2016, 03:10 PM Go to last post
  23. Generate samples from distribution

    How can I generate the samples from 0.5*delta(0.35)+0.5*delta(0.25)? Thanks in advance, Alex

    Started by AlexSmith‎, 02-22-2011 01:27 AM
    • Replies: 3
    • Views: 5,174
    02-22-2011, 07:44 AM Go to last post
  24. Question GOLF scorecards combinations?

    I have not find the answer in Google or elsewhere hope some one will help me find the right answer The question is about GOLF scorecards...

    Started by Alexstat‎, 02-29-2016 11:19 PM
    • Replies: 0
    • Views: 902
    02-29-2016, 11:19 PM Go to last post
  25. Permanova with covariate

    Dear all, I have designed a permanova analysis with covariate. It is a 1factorial design 1 Factor: Site (6 levels). 1 Covariate (Algal...

    Started by alexthomaswolf‎, 08-19-2012 08:06 AM
    • Replies: 9
    • Views: 5,409
    08-22-2012, 04:23 PM Go to last post
  26. Non-parametric testing

    Hello everyone! I am a student doing her master thesis. I have never studied or used statistics, but have been advised to do for my thesis. Let...

    Started by AlexTht‎, 07-22-2015 05:32 AM
    • Replies: 0
    • Views: 709
    07-22-2015, 05:32 AM Go to last post
  27. Is Chi Square the right test to use?

    Dear all, I am having a bit of trouble figuring out which test to perform in the following case: In my eye-tracking study participants are...

    Started by Alex_Ringo‎, 07-01-2011 05:14 AM
    categorical data analysis, chi square, fisher exact test, frequency, nominal variable
    • Replies: 2
    • Views: 2,266
    07-01-2011, 07:08 AM Go to last post
  28. Finding the AR and MA using ACF and PACF

    Hey, I mtrying to use ACF and PACF to find how how to specify an arma model, My textbooks says: AR(p) model: ACF tails off, PACF cuts off...

    Started by alf‎, 04-20-2012 12:38 PM
    • Replies: 3
    • Views: 10,928
    04-23-2012, 04:52 PM Go to last post
  29. Interpret some time series plots(residuals, qq, ljung box)

    Hey, I'm trying to fit a sarima model to some unemployment data suing R and wit one of the models I got this plot(see attachment). stadardized...

    Started by alf‎, 04-26-2012 01:56 PM
    • Replies: 2
    • Views: 3,025
    04-27-2012, 08:54 AM Go to last post
  30. Taking expectation of average^2

    Let x_1, x_2,...., x_n be observations from a weakly stationary time series where E(x_t) = mu. I want to find the expectaion of(periodogram with...

    Started by alf‎, 05-19-2012 11:59 AM
    • Replies: 3
    • Views: 1,565
    05-20-2012, 03:05 PM Go to last post
  31. Student need help with vetting school work

    Hi will someone be kind enough to please help me vet my school work please.?? There are still portion that I am uncertain of what to do. And I...

    Started by alfabahrain‎, 09-20-2008 09:56 PM
    • Replies: 0
    • Views: 1,900
    09-20-2008, 09:56 PM Go to last post
  32. Is t-student enough for comparing these?

    Hello, I'd like to compare two methods of measuring compounds quantity on chromatography paper, which we may call method A and method B (kind of...

    Started by alfalfa‎, 11-10-2015 08:17 PM
    • Replies: 3
    • Views: 1,589
    11-11-2015, 08:23 AM Go to last post
  33. Question Comparing two measuring methods ?

    Hi, I'd like to compare two devices to measure viscosity (like using two different kinds of weighing scales) on 6 different materials. Each...

    Started by alfalfa‎, 11-19-2015 04:09 AM
    • Replies: 3
    • Views: 1,558
    11-20-2015, 02:49 AM Go to last post
  34. Exclamation reading Bland-Altman plot

    Hello, this is the plotting of about 200 double measurements (measured 200 samples with 2 different methods). Could I consider the 2 methods...

    Started by alfalfa‎, 11-19-2015 09:32 PM
    • Replies: 1
    • Views: 1,208
    11-20-2015, 08:06 AM Go to last post
  35. Finding the average of percentage increase of data in a tabular form

    Hi guys I need some help on which method is the best to use in calculating the average of percentage increase

    Started by Alfiegenius‎, 03-15-2017 01:28 AM
    • Replies: 0
    • Views: 909
    03-15-2017, 01:28 AM Go to last post
  36. How do determine min sample size for auditing medical claims by medical records?

    I have a sampling methodology question I'm in need some statistical expertise with: I'm trying to determine how to calculate the minimum sample...

    Started by alfields326‎, 05-24-2010 05:26 PM
    • Replies: 3
    • Views: 10,911
    08-17-2010, 10:15 AM Go to last post
  37. Exclamation How do we obtain the frequencies (fi) from a table that shows only the percentages?

    I have to calculate R concentration ratio: Investment Type____________________Percentage Government Bonds___________________________55...

    Started by Alfieri132‎, 05-17-2011 03:20 PM
    • Replies: 2
    • Views: 1,726
    05-17-2011, 03:51 PM Go to last post
  38. Nominal data - how thick am I?!!!

    Help needed!!! I'm currently completing my dissertation on sustainable procurement - looking at the buying practices of staff and suppliers to my...

    Started by Ali‎, 10-23-2006 10:59 AM
    • Replies: 0
    • Views: 2,639
    10-23-2006, 10:59 AM Go to last post
  39. A Question on Percentiles

    Hi All, I have a question on percentiles. I have some data that is in 5 minute intervals. Each 5 minute period has an average time in seconds that...

    Started by ali13‎, 07-30-2007 05:49 AM
    • Replies: 2
    • Views: 2,771
    08-09-2007, 04:48 AM Go to last post
  40. unequal sample sizes

    Hello there, Please can anyone help me here? I've been lead to understand that it's dodgy to do a 2 x 2 anova when the 4 resulting subgroups have...

    Started by Ali59‎, 11-10-2009 10:07 AM
    • Replies: 0
    • Views: 5,305
    11-10-2009, 10:07 AM Go to last post
  41. problems proving the 4th moment for discrete, cont. cases

    X is a random variable with moments, E, E, E, and so forth. Prove the following is true for i) X is discrete, ii) X is continuous E^4 = E(X^4) -...

    Started by alias‎, 10-07-2011 09:26 PM
    • Replies: 8
    • Views: 4,382
    10-09-2011, 10:48 AM Go to last post
  42. Expected Value of normally distributed random variables

    Given two independent random variables Y and W. Where Y is distributed as N(0,1) and W is distributed as N(0.100). a) Show that E = 1 and E = 0...

    Started by alias‎, 10-30-2011 12:01 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 9,712
    11-03-2011, 08:06 PM Go to last post
  43. Derive Expected Value of Yhat

    Yhat = 1/n Derive E(Yhat) and show that Var(Yhat) = ((1.25σ^2)/n) I don't know how to work with the constants to get the Expected Value and...

    Started by alias‎, 11-04-2011 12:54 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 8,346
    11-06-2011, 05:50 AM Go to last post
  44. Sampling Estimates

    Course: Sampling Methodology A university has 807 faculty members. For each faculty member, the number of refereed publications was recorded. This...

    Started by alias‎, 01-23-2012 02:26 PM
    • Replies: 1
    • Views: 5,668
    01-23-2012, 07:50 PM Go to last post
  45. Find the required sample size

    Given info: cost1=$4, σ1=10, W1=N1/N=0.4 cost2=$9, σ2=20, W2=N2/N=0.6 The first part of this question asks for the values of n1/n and n2/n that...

    Started by alias‎, 02-04-2012 08:35 PM
    • Replies: 0
    • Views: 1,231
    02-04-2012, 08:35 PM Go to last post
  46. Find the required sample size

    Stratified Sampling Question given info: cost1=$4, σ1=10, W1=N1/N=0.4 cost2=$9, σ2=20, W2=N2/N=0.6 The first part of this question asks for the...

    Started by alias‎, 02-05-2012 05:03 PM
    • Replies: 0
    • Views: 1,194
    02-05-2012, 05:03 PM Go to last post
  47. Bias of the ratio estimator for pop. mean

    I need to explain why the ratio estimator of the population mean is biased or unbiased. I am fairly certain that it is a biased estimator but I...

    Started by alias‎, 03-04-2012 09:04 PM
    • Replies: 2
    • Views: 2,123
    03-04-2012, 10:32 PM Go to last post
  48. Question Non-parametric analysis question - please help!

    Hi. Cool forum btw - just what I need! :) I have agonised over this for while. I have two lots of questionnaire data - for one study this is...

    Started by alias grace‎, 06-08-2006 07:07 AM
    • Replies: 9
    • Views: 3,412
    06-19-2006, 10:07 PM Go to last post
  49. Forget how to normalize to a range

    I used to know how... I want to normalize a set of data to -2.5 to 2.5, but I only remember how to do between 0 and 1, any help or references would...

    Started by alias123‎, 01-26-2015 06:04 AM
    • Replies: 1
    • Views: 1,541
    01-26-2015, 08:17 AM Go to last post
  50. Non-normality persisting after various transformations

    Hi, I am using SPSS18. I am comparing a psychological treatment (n=26) to a control (n=32), but at the moment I'm still doing data cleaning and...

    Started by Alice‎, 02-22-2012 06:34 PM
    • Replies: 9
    • Views: 2,410
    02-23-2012, 12:12 AM Go to last post
  51. Outliers and 5% trimmed means vs true mean

    Hi, I have a few categorical (likert scale) variables that each have 1 univariate outlier (z-score > 2.88 two tailed). I am considering recoding...

    Started by Alice‎, 02-26-2012 07:24 PM
    • Replies: 6
    • Views: 8,051
    02-26-2012, 09:39 PM Go to last post
  52. Transformations - variables at different time points

    Hi, I am going to be looking at variables (e.g. levels of depression) over different time points (T1-T2). If the variable for depression at T2 has...

    Started by Alice‎, 02-26-2012 10:21 PM
    • Replies: 1
    • Views: 2,855
    02-26-2012, 10:56 PM Go to last post
  53. Box's M not being shown

    Hi, Does any one know what this error means in a Manova: "Box's Test of Equality of Covariance Matrices is not computed because there are fewer...

    Started by Alice‎, 03-29-2012 07:32 PM
    • Replies: 0
    • Views: 1,608
    03-29-2012, 07:32 PM Go to last post
  54. Comparing frequency data - repeated measures

    Hi, I am using SPSS and wanting to compare post-test frequency data (frequency of dysfunction) to follow-up frequency data, for the treatment...

    Started by Alice‎, 06-22-2012 02:01 AM
    • Replies: 1
    • Views: 5,155
    07-31-2012, 07:49 PM Go to last post
  55. Can i do a t-test after Tukey post hoc?

    Hello just wondering if this is acceptable or whether it's just gonna cause a type-1 error. I have used One-way ANOVA and then Tukey post hoc to...

    Started by Alice1436‎, 04-13-2013 05:59 AM
    • Replies: 8
    • Views: 2,837
    04-14-2013, 06:33 AM Go to last post
  56. Really Basic A level Statistics Test. (Multiple Choice)

    1) ‘Cluster sampling’ is a term given to one method of (a) Selecting random numbers using excel (b) Probabilistic sample selection...

    Started by Alice15492‎, 03-07-2012 04:27 PM
    a level, sampling, simple, statistics test
    • Replies: 9
    • Views: 6,339
    03-08-2012, 04:01 AM Go to last post
  57. Red face Binomial expectation E(X|X>1)

    General case: X~B(n,p) I could integrate the product of x and pmf from 1 to infinity and divide it by the integral of just pmf from 1 to infinity...

    Started by AliceBaker‎, 10-16-2017 02:03 PM
    binomial, conditional expectation, conditional variance, expectation
    • Replies: 1
    • Views: 151
    10-16-2017, 04:20 PM Go to last post
  58. Help with non-linearity (log odds and predictor) in logistic regression - next steps

    Hi, I posted this previously in the wrong section of the forum . . . I think it belongs here. I'm new to modelling and logistic regression, so I...

    Started by AliceMiles‎, 03-05-2017 01:23 AM
    • Replies: 1
    • Views: 1,180
    03-05-2017, 02:56 AM Go to last post
  59. Question Probability density function question

    Hey, If someone can help me with the question im about to post i'll be very grateful. Even if its just the formulae. Question: Suppose the...

    Started by Alicia‎, 04-24-2008 01:46 AM
    • Replies: 1
    • Views: 5,739
    04-24-2008, 02:15 PM Go to last post
  60. Unhappy Bivariate Normal Distribution

    Hello! I am trying to figure out how to prove that - given that (X1,X2) has a bivariate normal distribution and each is a standard normal...

    Started by alicia7‎, 09-24-2010 05:55 PM
    • Replies: 3
    • Views: 4,544
    09-28-2010, 09:45 PM Go to last post

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