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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: 66,912
    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: 197,077
    07-16-2014, 11:01 AM Go to last post
  1. Question ranges of both variables in correlation

    We are looking at frequency of practice (x) and performance (y) across trials. We have two ways of computing practice x and performance y. One way ...

    Started by dianne‎, 11-11-2008 12:41 PM
    • Replies: 2
    • Views: 2,664
    11-11-2008, 04:45 PM Go to last post
  2. Post Regression, help?

    In the following regression, X = weekly pay, Y = income tax withheld, and n = 35 McDonald’s employees. (a) Write the fitted regression equation. ...

    Started by trbyrd2001‎, 11-11-2008 06:11 PM
    • Replies: 0
    • Views: 2,456
    11-11-2008, 06:11 PM Go to last post
  3. Exclamation sampling distributions

    following cardiac surgery, patients are encouraged to exercise regularly (assuming that reg exercise is defined as exercising on 3 or more days a...

    Started by santashelper‎, 11-11-2008 04:32 PM
    • Replies: 1
    • Views: 2,656
    11-11-2008, 08:27 PM Go to last post
  4. Appropriate data for ANOVA?

    Hey all, I am beginning a study of gesturing. My research question is whether participants employ gestures in ways that are sensitive to recipient...

    Started by jwallin‎, 11-10-2008 02:01 AM
    • Replies: 5
    • Views: 2,590
    11-11-2008, 10:16 PM Go to last post
  5. significance level help

    It is commonly accepted that the mean temperature of humans is 98.6 F. The CEO has nothing better to do but measure the temperatures of 26 department...

    Started by sunstone‎, 11-12-2008 09:47 AM
    • Replies: 0
    • Views: 2,354
    11-12-2008, 09:47 AM Go to last post
  6. 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: 2,010
    11-12-2008, 10:21 AM Go to last post
  7. 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: 2,355
    11-12-2008, 01:33 PM Go to last post
  8. 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: 2,152
    11-12-2008, 08:39 PM Go to last post
  9. 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: 1,760
    11-12-2008, 10:35 PM Go to last post
  10. 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: 2,230
    11-13-2008, 07:45 AM Go to last post
  11. 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: 1,503
    11-13-2008, 10:44 AM Go to last post
  12. 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: 2,070
    11-13-2008, 12:28 PM Go to last post
  13. 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: 2,857
    11-13-2008, 06:28 PM Go to last post
  14. 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: 14,393
    11-13-2008, 06:36 PM Go to last post
  15. 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: 2,803
    11-13-2008, 06:47 PM Go to last post
  16. 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: 5,209
    11-14-2008, 06:52 AM Go to last post
  17. 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: 2,626
    11-14-2008, 09:23 AM Go to last post
  18. 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: 7,284
    11-14-2008, 11:39 AM Go to last post
  19. 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: 1,886
    11-14-2008, 11:42 AM Go to last post
  20. 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: 2,368
    11-14-2008, 02:04 PM Go to last post
  21. 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: 9,944
    11-14-2008, 07:27 PM Go to last post
  22. 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: 4,418
    11-14-2008, 08:21 PM Go to last post
  23. 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: 5,549
    11-15-2008, 05:54 AM Go to last post
  24. 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: 4,428
    11-15-2008, 10:12 AM Go to last post
  25. 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: 4,168
    11-15-2008, 11:43 AM Go to last post
  26. 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: 2,382
    11-15-2008, 04:24 PM Go to last post
  27. 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: 2,713
    11-16-2008, 04:24 AM Go to last post
  28. 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: 5,851
    11-16-2008, 08:29 AM Go to last post
  29. 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: 10,791
    11-16-2008, 09:55 AM Go to last post
  30. 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: 18,407
    11-16-2008, 11:03 AM Go to last post
  31. 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: 2,201
    11-16-2008, 04:31 PM Go to last post
  32. 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: 3,015
    11-16-2008, 04:52 PM 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: 2,261
    11-16-2008, 11:39 PM Go to last post
  34. 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: 1,870
    11-17-2008, 01:08 AM Go to last post
  35. 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: 1,433
    11-17-2008, 03:55 AM Go to last post
  36. 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: 2,262
    11-17-2008, 07:21 AM Go to last post
  37. 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: 2,645
    11-17-2008, 10:14 PM Go to last post
  38. 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: 4,011
    11-18-2008, 12:35 AM Go to last post
  39. 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: 4,661
    11-18-2008, 08:03 AM Go to last post
  40. 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: 2,576
    11-18-2008, 09:00 AM Go to last post
  41. 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: 3,055
    11-18-2008, 05:58 PM Go to last post
  42. 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: 2,754
    11-19-2008, 05:18 AM Go to last post
  43. 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: 7,939
    11-19-2008, 09:23 AM Go to last post
  44. 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: 1,867
    11-19-2008, 10:29 AM Go to last post
  45. 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: 2,598
    11-19-2008, 03:29 PM Go to last post
  46. 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: 4,194
    11-19-2008, 04:05 PM Go to last post
  47. 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: 2,833
    11-20-2008, 07:50 AM Go to last post
  48. 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: 1,792
    11-20-2008, 09:20 AM Go to last post
  49. 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: 1,849
    11-20-2008, 10:19 AM Go to last post
  50. 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: 1,940
    11-20-2008, 03:05 PM Go to last post
  51. 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: 10,528
    11-20-2008, 03:07 PM Go to last post
  52. 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: 3,106
    11-20-2008, 03:51 PM Go to last post
  53. 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: 2,601
    11-20-2008, 04:02 PM Go to last post
  54. 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: 1,991
    11-20-2008, 05:36 PM Go to last post
  55. 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: 3,562
    11-20-2008, 07:35 PM Go to last post
  56. 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: 1,937
    11-20-2008, 09:20 PM Go to last post
  57. 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: 2,000
    11-20-2008, 09:56 PM Go to last post
  58. 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: 2,252
    11-20-2008, 11:48 PM Go to last post
  59. 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: 8,412
    11-21-2008, 01:03 AM Go to last post
  60. 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: 3,852
    11-21-2008, 03:18 AM Go to last post

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