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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: 196,702
    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: 66,727
    09-30-2005, 09:44 AM Go to last post
  1. p-value method

    I am having trouble with this question, I am a little confused about the 'p-value approach'. I thought that I should find the pooled variance and...

    Started by sarah169‎, 11-22-2008 04:45 AM
    • Replies: 0
    • Views: 3,620
    11-22-2008, 04:45 AM Go to last post
  2. Hypothesis testing, t-test?

    First post, and yes it's homework help, I'm just drawing a complete blank as to how to approach this: Our prof has said that we always make...

    Started by Dyoksyn‎, 11-21-2008 05:13 PM
    • Replies: 0
    • Views: 3,101
    11-21-2008, 05:13 PM Go to last post
  3. Stats Help Please!

    Hi All, I have a question from my boss I just cannot answer. In my job, we have a 6% decrease of injuries on the workforce in our data. The...

    Started by Caliboi‎, 11-21-2008 04:31 PM
    • Replies: 1
    • Views: 2,352
    11-21-2008, 04:55 PM Go to last post
  4. Question non-parametric two way ANOVA

    Hello, I'm so glad i found this site! I am wondering whether anyone knows of what non-parametric test i could use as equivalent to a two way...

    Started by anna57‎, 11-20-2008 05:32 AM
    • Replies: 7
    • Views: 24,929
    11-21-2008, 11:41 AM Go to last post
  5. GLM Gamma Assumptions

    Hi Everyone- When fitting a generalized linear model - say a log link and gamma distribution (errors), would one substitute the linear regression...

    Started by B_Miner‎, 11-13-2008 07:51 PM
    • Replies: 1
    • Views: 4,905
    11-21-2008, 08:30 AM Go to last post
  6. Unit Root

    Hello, I am required to test for a unit root using EViews statistical package. To do so I am using an Augmented Dickey-Fuller test. The package;...

    Started by Steve1001‎, 11-21-2008 03:18 AM
    • Replies: 0
    • Views: 3,799
    11-21-2008, 03:18 AM Go to last post
  7. Help with this one, please?

    Suppose certain coins have weights that are normally distributed with a mean of 5.358 g and a standard deviation of0.052 g. A vending machine is...

    Started by MotherBear1975‎, 11-20-2008 10:54 PM
    • Replies: 3
    • Views: 8,364
    11-21-2008, 01:03 AM Go to last post
  8. help with pearson problem

    Hi. I have a homework with a bunch of different problems that are not identified. Our job is to identify if they are pearson or spearman then...

    Started by better20‎, 11-20-2008 11:48 PM
    • Replies: 0
    • Views: 2,220
    11-20-2008, 11:48 PM Go to last post
  9. your opinion on a statistical procedure with ANCOVAs

    Hello, I was wondering if you could tell me whether you agree with this statistical analysis for my school paper. I have 3 groups with demographic...

    Started by bergier‎, 11-16-2008 05:29 PM
    • Replies: 2
    • Views: 1,994
    11-20-2008, 09:56 PM Go to last post
  10. How can I go deeper into ANOVA?

    I am doing some research on office work and where people look at work. I have one independent variable with four different levels, that is I had...

    Started by Parcival‎, 11-20-2008 10:25 AM
    • Replies: 1
    • Views: 1,916
    11-20-2008, 09:20 PM Go to last post
  11. Please Help with Test Questions

    hello guys i need your help with these questions,these are test review questions and i started to solve them but i need second thought on them....

    Started by Nesha‎, 11-20-2008 03:33 AM
    • Replies: 4
    • Views: 3,545
    11-20-2008, 07:35 PM Go to last post
  12. Finding P-value based on hypothesis

    Hey guys, so I'm not really good at math and I need some help understanding this problem if anyone would be so kind so help me with it. Null...

    Started by locoblonde08‎, 11-20-2008 05:36 PM
    • Replies: 0
    • Views: 1,968
    11-20-2008, 05:36 PM Go to last post
  13. Question p-value measurement

    Hi prospectively helpful folks, My gratitude for anyone who can help me, a statistics novice educated in the last hour by Wikipedia and other...

    Started by sadroit‎, 11-20-2008 11:29 AM
    • Replies: 2
    • Views: 2,579
    11-20-2008, 04:02 PM Go to last post
  14. Fitting a model with poisson errors to data with normal errors

    Hi, As part of my research, I am having to fit data, which has normal errors, with a model. Until now, I have been assuming that the model values...

    Started by melkor445‎, 11-20-2008 03:51 PM
    • Replies: 0
    • Views: 3,074
    11-20-2008, 03:51 PM Go to last post
  15. When to use 5pt vs. 7pt Likert Scale?

    I am working a survey for physicians, and am planning on utilizing a Likert Scale for an assessment. I've heard different things from a few...

    Started by nycIHC‎, 11-18-2008 01:56 PM
    • Replies: 4
    • Views: 10,485
    11-20-2008, 03:07 PM Go to last post
  16. Proper syntax in peer reviewed papers

    Hi, I have a question about how to properly write statistics in a peer reviewed scientific (non statistical) paper. If you were to say, 'such and...

    Started by somnum‎, 11-20-2008 10:43 AM
    • Replies: 1
    • Views: 1,916
    11-20-2008, 03:05 PM Go to last post
  17. What test to use?

    Hello! Can anyone enlighten me on this one. I am supossed to answer the following questions for an exam: 1. Does taking an SAT preparation...

    Started by Merlion‎, 11-19-2008 09:31 PM
    • Replies: 2
    • Views: 1,791
    11-20-2008, 10:19 AM Go to last post
  18. A question regarding the size of a sample

    Hello everyone! these days I am working with seemingly unrelated regression to improve the efficiency of my results. Now, I am wondering how...

    Started by nelson‎, 11-20-2008 09:20 AM
    • Replies: 0
    • Views: 1,786
    11-20-2008, 09:20 AM Go to last post
  19. Probability question- Help Im stuck

    Question: A group of 100 people exhibited the following blood types: A20 B24 AB10 O46 If one person is selected at random, what is the probability...

    Started by sweetx‎, 11-19-2008 11:18 PM
    • Replies: 1
    • Views: 2,802
    11-20-2008, 07:50 AM Go to last post
  20. Studentised range value

    Hi, I am part of the way through conducting a Tukey hsd test and now require my studentised range critical value (qt). My problem: My df's and...

    Started by UK2008‎, 11-19-2008 12:27 PM
    • Replies: 4
    • Views: 4,144
    11-19-2008, 04:05 PM Go to last post
  21. What Statistical Test do I use?

    Can someone please help... I need to test my research hypothesis by having SPSS conduct the appropriate statistical analysis, the problem is I am...

    Started by seanponders‎, 11-19-2008 12:01 PM
    • Replies: 5
    • Views: 2,569
    11-19-2008, 03:29 PM Go to last post
  22. beginner, very quick question!

    Hello, isn't it always the way you get work and crash at the first hurdle.. I'm estimating an equation using data that is already in log form -...

    Started by wonderchick‎, 11-19-2008 10:29 AM
    • Replies: 0
    • Views: 1,856
    11-19-2008, 10:29 AM Go to last post
  23. Using normal to approximate binomial

    "After changing to newer healthier food oils, the company claims that 97 out of 100 people cannot detect a difference in taste between the new and...

    Started by endeavor‎, 11-18-2008 09:00 PM
    • Replies: 1
    • Views: 7,925
    11-19-2008, 09:23 AM Go to last post
  24. Regression Analysis

    I am writing a report for my Key Skills Tutorial and the instructions specifically ask me to use regression analysis for the data i was provided. ...

    Started by d.g.aspinall‎, 11-12-2008 07:55 PM
    • Replies: 4
    • Views: 2,728
    11-19-2008, 05:18 AM Go to last post
  25. Comparing rank orders

    OK ... I have a 15 items overall ... I have two lists of 10 items (column A and column B) Some items do not appear in column A, and some do not...

    Started by Philyuko‎, 11-18-2008 05:58 PM
    • Replies: 0
    • Views: 3,022
    11-18-2008, 05:58 PM Go to last post
  26. Sampling from variables with known probability distribution functions

    Greetings, everyone! Here comes another of my irritating questions, divided in parts. Help will be greatly appreciated... 1. Let us presume that...

    Started by Navaak‎, 11-18-2008 09:00 AM
    • Replies: 0
    • Views: 2,554
    11-18-2008, 09:00 AM Go to last post
  27. Thumbs up Ti 84 and weighted descriptive stats

    Hi Im really gettin frustrated here and I know some amazing person will help. I have a class where i constantly get problems like this: ...

    Started by ksnapp‎, 11-15-2008 11:08 AM
    • Replies: 9
    • Views: 4,631
    11-18-2008, 08:03 AM Go to last post
  28. what formula do you use

    The mean length of stay of Employees in a dangerous industry is 16.7 months. One hundred randomly selected employees at my brothers cafe had a mean...

    Started by sunstone‎, 11-16-2008 04:09 PM
    • Replies: 3
    • Views: 3,954
    11-18-2008, 12:35 AM Go to last post
  29. Estimation and confidence intervals questions?

    Hi there! I'm new here, and have a few questions concerning the last few chapters we've been covering in my intro to stats course. I'm absolutely...

    Started by badatthis‎, 11-17-2008 01:12 PM
    • Replies: 1
    • Views: 2,618
    11-17-2008, 10:14 PM Go to last post
  30. Regression advice needed for power technology cost analysis

    Hi, As part of a project we need to do an analysis of the capital costs of different technologies that exist across the power spectrum - such as...

    Started by DaMooseDog‎, 11-17-2008 07:21 AM
    • Replies: 0
    • Views: 2,244
    11-17-2008, 07:21 AM Go to last post
  31. Question Which test to use?

    I have a very small dataset of proportions. Which test would I use to compare 3 values for one group to 3 values for another group? My data looks...

    Started by xtina.i‎, 11-17-2008 03:55 AM
    • Replies: 0
    • Views: 1,425
    11-17-2008, 03:55 AM Go to last post
  32. Question chi-squared appropriate?

    I am working on a project trying to determine the likelihood of recurrence of an ocular disease in a sample of 50 patients. I'm new to statistics...

    Started by kathmandu2008‎, 11-17-2008 01:08 AM
    • Replies: 0
    • Views: 1,854
    11-17-2008, 01:08 AM Go to last post
  33. Independence or homogeneity?

    I am confused if these two problems are either independence or homogeneity: 1. data is given to us that shows levels of education attained by age...

    Started by wany23‎, 11-15-2008 04:51 PM
    • Replies: 1
    • Views: 2,241
    11-16-2008, 11:39 PM Go to last post
  34. Question regarding Single waiting line and Multiple waiting lines at the banks

    The listed values are waiting times (in minutes) of customers. Bank A (Single waiting line) 6.5, 6.6, 6.7, 6.8, 7.1, 7.3 7.4, 7.7, 7.7, 7.7...

    Started by Thakur‎, 11-16-2008 04:52 PM
    • Replies: 0
    • Views: 2,990
    11-16-2008, 04:52 PM Go to last post
  35. Goodness of fit (particular problem)

    The following table shows the distribution of weekly salaries for samples of 100 women and 100 men in a large company. Salary...

    Started by sashimi‎, 11-16-2008 05:59 AM
    • Replies: 1
    • Views: 2,173
    11-16-2008, 04:31 PM Go to last post
  36. What are the benefits of Variance and Standard Deviation

    Dear Friends, Please let me know the benefits of Variance and Standard Deviation. What all, I can do using Variance and Standard Deviation. How...

    Started by Thakur‎, 11-15-2008 01:49 PM
    • Replies: 4
    • Views: 18,348
    11-16-2008, 11:03 AM Go to last post
  37. Question Difference between one-tail and two-tail t test

    Hey I am a newbie here. Think in real simple terms. I am having trouble understanding the differnece between one-tail and two-tail t tests....

    Started by cheywind‎, 11-15-2008 03:34 PM
    • Replies: 2
    • Views: 10,713
    11-16-2008, 09:55 AM Go to last post
  38. Error calculation for best fit line

    I have a question regarding the calculation of errors from a line of best fit in log space. At the moment the errors I am getting seem unreasonably...

    Started by chris251‎, 11-16-2008 08:29 AM
    • Replies: 0
    • Views: 5,822
    11-16-2008, 08:29 AM Go to last post
  39. Correlation

    I have 2 sets. I formed 5000 random groups of sizes ranging from 2 to 100 per group from the 1st set (sample size:4991)and then computed the average...

    Started by 12345678‎, 11-16-2008 04:24 AM
    • Replies: 0
    • Views: 2,684
    11-16-2008, 04:24 AM Go to last post
  40. chi-sq help

    ok i have this problem Do these data suggest there are significant differences in opportunities for black and Hispanic Americans who have completed...

    Started by wany23‎, 11-14-2008 03:20 AM
    • Replies: 3
    • Views: 2,352
    11-15-2008, 04:24 PM Go to last post
  41. Help with Principal Component Analysis

    Hi All Can Principal Component Analysis be used to discover what variables explain variability in a set of data from a dose response experiment...

    Started by enriquezudaire‎, 11-15-2008 11:43 AM
    • Replies: 0
    • Views: 4,132
    11-15-2008, 11:43 AM Go to last post
  42. Help with HLM

    Can anybody help me by telling whether the following data IS suitable form HLM? Variable 1: Three regions (of the world) Variable 2: Several...

    Started by Philyuko‎, 11-10-2008 02:37 PM
    • Replies: 13
    • Views: 4,408
    11-15-2008, 10:12 AM Go to last post
  43. Correlation among Correlations

    I know correlation between AB, AC as 0.91 and -0.45 respectively. Also standard deviation of three variables (A, B, and C) are given as 6.2, 8, and...

    Started by esandun‎, 11-14-2008 05:02 AM
    • Replies: 6
    • Views: 5,514
    11-15-2008, 05:54 AM Go to last post
  44. Wilcoxon vs Friedman? help

    Hello everyone, I'm new to this site. I'd just quickly like to say how useful this site has been. I've been reading through posts for the last 3...

    Started by roses‎, 11-14-2008 08:21 PM
    • Replies: 0
    • Views: 4,395
    11-14-2008, 08:21 PM Go to last post
  45. re: zero in confidence interval but p-value < alpha

    Hello. I would be very much appreciative of any help in this issue. The problem involves the difference of means of 2 dependent samples. The null...

    Started by la_pork‎, 11-14-2008 03:16 PM
    • Replies: 7
    • Views: 9,911
    11-14-2008, 07:27 PM Go to last post
  46. Red face Problem of high correlation between some of predictors to be used in StepW regression

    Hi All, I was supposed to do a stepwise regression to predict the crop cover using satellite image indices, Soil types and Soil geomorphogenetic...

    Started by Mobushir riaz Khan‎, 11-14-2008 08:04 AM
    • Replies: 1
    • Views: 2,361
    11-14-2008, 02:04 PM Go to last post
  47. Comparing differences by age when the IV is continuous: Please help

    Hi I have done some work analysing a number of research questions. I now want to go back across all of these questions and see whether respondents...

    Started by gemma7‎, 11-14-2008 09:33 AM
    • Replies: 2
    • Views: 1,873
    11-14-2008, 11:42 AM Go to last post
  48. Smile simple slopes in 3-way moderated regression

    Hi I am trying to work out how to do simple slopes test for a three way moderated regression. Here is how my data set looks: IV 1: dichotomous...

    Started by Donna‎, 11-12-2008 12:25 PM
    • Replies: 4
    • Views: 7,248
    11-14-2008, 11:39 AM Go to last post
  49. stepwise regression

    Hi everyone, A quick couple of questions regarding stepwise regression: a)how can you have variables added to the model that become insignificant...

    Started by billyn‎, 11-14-2008 09:23 AM
    • Replies: 0
    • Views: 2,588
    11-14-2008, 09:23 AM Go to last post
  50. Exponential smoothing

    Hello guys, im a uni student and have been put on a module that has alot of maths in it and ive never done maths in any other modules so im looking...

    Started by richtheman87‎, 11-11-2008 10:20 AM
    • Replies: 14
    • Views: 5,190
    11-14-2008, 06:52 AM Go to last post
  51. The variance of variance

    Hello all I am investigating variances between projected and actual costs in my workplace and plan to implement a solution to reduce the spread...

    Started by coogsy‎, 11-13-2008 06:47 PM
    • Replies: 0
    • Views: 2,768
    11-13-2008, 06:47 PM Go to last post
  52. level of significance Calculator Problem

    I need help with this question, Im studying for a test and this was an example problem. ( I already have the answers, im just trying to figure out...

    Started by cooltee13‎, 11-12-2008 04:26 PM
    • Replies: 3
    • Views: 14,359
    11-13-2008, 06:36 PM Go to last post
  53. Non-Parametric Testing

    Hello, My data set is not normalized and any transformations (lg10, sqrt) I have done have only made it worse. That said, I have turned to the...

    Started by jbullydawg‎, 11-13-2008 05:17 PM
    • Replies: 1
    • Views: 2,826
    11-13-2008, 06:28 PM Go to last post
  54. Question Stat S2 level Question

    An indoor tennis centre has five courts which are booked by members of the public, usually over the telephone. Demand for each hour in the...

    Started by Sig‎, 11-13-2008 12:24 PM
    • Replies: 1
    • Views: 2,053
    11-13-2008, 12:28 PM Go to last post
  55. Question Normal distribution, Confusing. Please help

    Weekly demand for packs of a certain make of chocolate trifle at a major supermarket store has a Normal distribution with mean of 200 and standard...

    Started by Sig‎, 11-13-2008 10:44 AM
    • Replies: 0
    • Views: 1,482
    11-13-2008, 10:44 AM Go to last post
  56. Logistic Regression--HELP and THANK YOU

    Hi. My thesis is on using 5 measurements to use the proximal end of the tibia to determine ***. I'm using SPSS Free Version 17. My dependent...

    Started by sash‎, 11-11-2008 07:48 PM
    • Replies: 1
    • Views: 2,223
    11-13-2008, 07:45 AM Go to last post
  57. Question how to determine Beta and power

    I have worked on this problem for so long, that I am now confusing myself. Any help you can give me, would be appreciated. I am not looking for...

    Started by dogsmk‎, 11-12-2008 10:35 PM
    • Replies: 0
    • Views: 1,750
    11-12-2008, 10:35 PM Go to last post
  58. Thumbs up quick question

    2 questions, ill tell you what ive done so far. i) For the survey results below, for 300 students, find the p-value for the test of the null...

    Started by jgao_net‎, 11-12-2008 08:39 PM
    • Replies: 0
    • Views: 2,131
    11-12-2008, 08:39 PM Go to last post
  59. Greyhound betting

    I am a greyhound betting man and would appreciate some statistical advice. I bet with a betting exchange company on the internet.The type of bet I...

    Started by meanman‎, 11-12-2008 01:33 PM
    • Replies: 0
    • Views: 2,318
    11-12-2008, 01:33 PM Go to last post
  60. Right test?

    Hi guys, I am not sure I am testing the right way!? I have a sample with the number of order insertions for 30 different stocks for a complete...

    Started by tylerdurden1‎, 11-12-2008 06:32 AM
    • Replies: 4
    • Views: 1,992
    11-12-2008, 10:21 AM Go to last post

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