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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: 196,665
    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: 66,688
    09-30-2005, 09:44 AM Go to last post
  1. Question on Taguchi Method

    Hi, I had a question on the dummy treatment technique in the Taguchi method. Suppose I am downgrading a 3 level column into a 2 level column by...

    Started by subrataray‎, 05-24-2007 10:06 AM
    • Replies: 0
    • Views: 1,974
    05-24-2007, 10:06 AM Go to last post
  2. Problem- fluctuating negative control

    Hi, I have what sounds to me like a simple question that I just want to hear some opinions on. I'm trying to quantify changes in gene expression...

    Started by afolkl‎, 05-24-2007 09:13 AM
    • Replies: 0
    • Views: 1,687
    05-24-2007, 09:13 AM Go to last post
  3. This has to be simple if you know what you're doing?

    I have two data sets with very different magnitudes. The first data set ranges from 2000 to 40000. The second data set ranges from 20 to 500. I...

    Started by stevebar‎, 05-23-2007 03:22 PM
    • Replies: 1
    • Views: 2,661
    05-24-2007, 07:52 AM Go to last post
  4. Question Stuck on Acceptance Sampling

    Hi, I'm studying stats independently so don't have a teacher to ask how to finish this question. Any help would be much appreciated. Before being...

    Started by Statstastic‎, 05-23-2007 10:29 AM
    • Replies: 0
    • Views: 2,138
    05-23-2007, 10:29 AM Go to last post
  5. Which statistical test?

    Hi I have an exam on Monday and am trying to work out on practice question we received in class. It asks us to identify and match the appropriate...

    Started by ams‎, 05-18-2007 01:17 AM
    • Replies: 1
    • Views: 2,674
    05-21-2007, 07:15 PM Go to last post
  6. What's the point in T scores?

    Hi all, I have a questionnaire thay converts raw scores to T scores (scores with a mean of 50 and std. dev of 10). I have run some analyses and...

    Started by Kat‎, 05-16-2007 09:16 AM
    • Replies: 1
    • Views: 2,393
    05-19-2007, 09:25 PM Go to last post
  7. Which statistical test should I use

    In an experiment to test the hypothesis of group polarization there are two groups of 120 militarists and 80 pacifists. Both groups were asked to...

    Started by felix9999‎, 05-18-2007 06:16 AM
    • Replies: 1
    • Views: 2,504
    05-19-2007, 05:57 PM Go to last post
  8. Measurements of biodiversity

    When considering the biodiversity of an aquatic system after a human caused disaster (chemical spill) what would be a adequate measure of...

    Started by shift_540‎, 05-18-2007 02:00 AM
    • Replies: 1
    • Views: 2,587
    05-18-2007, 04:19 AM Go to last post
  9. Unhappy Survey Response Problem

    I hope someone will help me with this. The problem I have to work out is a scenario involving a survey. Let's say a survey is administered to 985...

    Started by Blogma‎, 05-16-2007 11:53 AM
    • Replies: 1
    • Views: 2,838
    05-16-2007, 11:48 PM Go to last post
  10. stat problem

    Suppose that your sister is a Floridian orange farmer. She followed a particular orange growing method (i.e. certain type of fertilizer, irrigation...

    Started by tiannagal4u‎, 05-16-2007 04:01 PM
    • Replies: 0
    • Views: 2,080
    05-16-2007, 04:01 PM Go to last post
  11. autoregression, autocorrelation

    Hi, I am estimating the following regression which contains lagged dependent variables and lagged indepedent variables and I am worried about the...

    Started by sun‎, 05-16-2007 11:35 AM
    • Replies: 0
    • Views: 3,069
    05-16-2007, 11:35 AM Go to last post
  12. Generating Random Numbers

    Hi guys i have a couple of Qs regarding generating random numbers: 1. Suppose you are given only 3 very basic tools: a uniform random number...

    Started by wlmi‎, 05-16-2007 06:57 AM
    • Replies: 0
    • Views: 2,894
    05-16-2007, 06:57 AM Go to last post
  13. Help needed on problem, URGENT! Thanks in advance.

    I'm stuck on figuring otu the mechanism required to solve these sample mean problems when you need to compare two different samples. Check it...

    Started by kellan‎, 05-15-2007 12:43 AM
    • Replies: 2
    • Views: 5,182
    05-16-2007, 03:49 AM Go to last post
  14. Real-life Ballot problem

    Wonder if anyone can help me. There has been an oversubscription of applications for tickets for a major sporting event so the organisers have...

    Started by flagpolecorner‎, 05-15-2007 01:04 PM
    • Replies: 0
    • Views: 3,188
    05-15-2007, 01:04 PM Go to last post
  15. Which test?

    I have been doing some research into sleep quality. I have two groups of people, labelled as good and bad. Each person has filled in Using the...

    Started by Confuzzled‎, 05-15-2007 10:26 AM
    • Replies: 0
    • Views: 2,133
    05-15-2007, 10:26 AM Go to last post
  16. Artificially create biased sample for low response

    Hi all, I am building a binary 0/1 logistic model where the response rate is very low (0.6%, 77000 out of 12000000). One suggestion was to...

    Started by anindya_mozumdar‎, 05-15-2007 09:29 AM
    • Replies: 0
    • Views: 2,271
    05-15-2007, 09:29 AM Go to last post
  17. Recommended Text

    Hello all! I am an undergrad who is wrapping up my BA in a few weeks and I am going to be attending graduate school in the Spring of 08; majoring...

    Started by statsnoviceGRRR‎, 05-05-2007 11:12 PM
    • Replies: 3
    • Views: 5,315
    05-15-2007, 01:13 AM Go to last post
  18. Unhappy please help

    I've been looking over some problems to see what tests and techniques i need to use but it's been a long while since i've worked on statistics, so...

    Started by stat84‎, 05-08-2007 02:51 PM
    • Replies: 1
    • Views: 1,684
    05-14-2007, 03:55 AM Go to last post
  19. Suitable statistic test

    Hello, I have been reading a scientific journal and I want to check the statistical significance between two groups in their results. I have the...

    Started by sunflower‎, 05-10-2007 09:54 AM
    • Replies: 1
    • Views: 2,679
    05-14-2007, 03:45 AM Go to last post
  20. Probability Question

    Urn 1 has 2 white balls and 4 red balls. Urn 2 has 2 white balls and 1 red ball. a ball is then randomly picked from urn 1 and placed into urn 2...

    Started by amavadia‎, 05-11-2007 06:38 PM
    • Replies: 2
    • Views: 2,435
    05-14-2007, 03:24 AM Go to last post
  21. Please Help

    Hi I have a problem at work. I don't know why I got it but there you go. I work in a hospital and we are changing how we provide care. This...

    Started by scotchpie‎, 05-14-2007 03:20 AM
    • Replies: 0
    • Views: 1,986
    05-14-2007, 03:20 AM Go to last post
  22. Talking ANOVA - Post Hoc Testing Problem.. Help!!

    Good Morning all, This is my first post.. I am so excited that this forum exists.. I am running an ANOVA at the moment, with a DV, and 3 IV's....

    Started by Leigh26‎, 05-12-2007 09:04 PM
    • Replies: 0
    • Views: 2,140
    05-12-2007, 09:04 PM Go to last post
  23. Basic Probability

    I need some help getting started with this question..... There N quantity of tourists on a bus and there are n quantity of children amongst them....

    Started by Kaliningradlad‎, 05-08-2007 06:23 AM
    • Replies: 2
    • Views: 2,789
    05-12-2007, 08:50 AM Go to last post
  24. I need a Professional statistician for answering the following question How I canProf

    Hello, every body, First of All I would like to introduce myself; I am a researcher in the field of plant physiology who do not have enough...

    Started by normalman‎, 05-10-2007 02:20 AM
    • Replies: 0
    • Views: 1,680
    05-10-2007, 02:20 AM Go to last post
  25. Variance/Normal Distributions

    I am currently in a psych tests and measurements class. I have a couple of questions that I can't figure out or find in the book. They are multiple...

    Started by shae13v‎, 01-26-2006 10:04 AM
    • Replies: 11
    • Views: 5,185
    05-09-2007, 10:38 AM Go to last post
  26. Question AS Statistics - Time Series Analysis (S2)

    Hello all My teacher was teaching us Time Series Analysis qiute a while ago and when he was explaining it i didn't understand properly and didn't...

    Started by aadd‎, 05-09-2007 10:24 AM
    • Replies: 0
    • Views: 4,170
    05-09-2007, 10:24 AM Go to last post
  27. Comparing two lines?

    Hey all, I'm just having a little trouble figuring out how to do this...I have a linear regression line, and am trying to statistically compare it...

    Started by ThePensive‎, 05-08-2007 02:55 PM
    • Replies: 0
    • Views: 2,645
    05-08-2007, 02:55 PM Go to last post
  28. Conditions Number, Collineartiy detection

    :shakehead Is there someone who can help me how to use the condition numbers for multicollinarity detection ????

    Started by sokol‎, 05-07-2007 03:16 PM
    • Replies: 0
    • Views: 2,039
    05-07-2007, 03:16 PM Go to last post
  29. study abroad

    hi to all, planstudyabroad.com are providing online free consultancy services for foreign education to all around the world. i got much useful...

    Started by allisfriend23‎, 05-07-2007 08:57 AM
    • Replies: 0
    • Views: 1,621
    05-07-2007, 08:57 AM Go to last post
  30. Additional Exercise for the book - A Course in Large Sample Theory" by Ferguson.

    The link is: http://www.math.ucla.edu/%7Etom/LST/lst.html I need help in solving some problems in section 5, 8, and 14. Does anyone have the...

    Started by sweetie‎, 05-06-2007 07:33 PM
    • Replies: 0
    • Views: 2,506
    05-06-2007, 07:33 PM Go to last post
  31. Finding Sample Standard Deviation

    Given this information, how would you know the sample standard deviation? 1) Your company has a contract to provide 3,000,000 bolts to a Chinese...

    Started by Mike87T‎, 05-06-2007 06:09 PM
    • Replies: 0
    • Views: 2,137
    05-06-2007, 06:09 PM Go to last post
  32. what is the minimum sample size for standard deviation?

    Hi. Just a quick question. Can you perform a standard deviation test if n=2? Thank you.

    Started by megano‎, 05-05-2007 05:20 PM
    • Replies: 0
    • Views: 7,115
    05-05-2007, 05:20 PM Go to last post
  33. Multicolinearity, eigenvalues

    How to find out the variables involved in a sets of multi-collinearity by the mean of the eigenvalues and condition number ?

    Started by sokol‎, 05-05-2007 03:23 PM
    • Replies: 0
    • Views: 2,031
    05-05-2007, 03:23 PM Go to last post
  34. Question How do I calculate tolerance values in a ANOVA?

    I need to understand how to hand calculate the tolerance values that are shown in an ANOVA table. This value has something to do with the multiple...

    Started by DOE Student‎, 05-04-2007 05:38 PM
    • Replies: 0
    • Views: 4,875
    05-04-2007, 05:38 PM Go to last post
  35. Statistical project

    Dear all, I have a small statistical project for my Intro to Statistics class. And I have decided to choose to interpret and compare markets in...

    Started by Ecce Homo‎, 05-04-2007 03:21 PM
    • Replies: 0
    • Views: 1,890
    05-04-2007, 03:21 PM Go to last post
  36. Help with Satorra & Bentler

    I have a problem regarding Satorra & Bentler: Could anyone give a precise explanation of SB statistics and what it tends to do if there is excess...

    Started by Everest‎, 05-04-2007 07:04 AM
    • Replies: 1
    • Views: 2,418
    05-04-2007, 02:20 PM Go to last post
  37. Chi-square

    The chi-squares are all of the form nc. Two situations: a) If the model does not hold, c converges to a positive constant C when sample size goes...

    Started by chidude‎, 05-04-2007 07:17 AM
    • Replies: 0
    • Views: 2,469
    05-04-2007, 07:17 AM Go to last post
  38. A test for a 'buffer' hypothesis

    Just wondered if anyone knows how I can test the hypothesis: 'Higher levels of Job Control act as a buffer against fatigue related to Job Demands' ...

    Started by Macka‎, 05-03-2007 10:26 PM
    • Replies: 0
    • Views: 1,504
    05-03-2007, 10:26 PM Go to last post
  39. How to determine whether 2 slopes are different when they are correlated?

    Hi! Let's say I have a variable "A" that I believe measures a trait, say, "greed". I show 2 groups of pictures (say, 10 pics in each group) to...

    Started by Hanshananigan‎, 05-03-2007 09:05 AM
    • Replies: 0
    • Views: 2,281
    05-03-2007, 09:05 AM Go to last post
  40. Hypothesis Testing Help!

    If anyone could help me out with this, I'd appreciate it. Looking at the increase in nicotine levels from 1998(1.72mg) to 2004(1.89mg) here. One...

    Started by Dante5609‎, 05-02-2007 05:31 PM
    • Replies: 1
    • Views: 2,406
    05-03-2007, 07:37 AM Go to last post
  41. Help with effect size on repeated measures

    Hi, I need some help on effect size on project I'm doing. Let me explain about the project. I measure the jump height on 30 men and 30 women at 7...

    Started by jmanqr‎, 05-02-2007 08:26 PM
    • Replies: 0
    • Views: 3,159
    05-02-2007, 08:26 PM Go to last post
  42. Test for differences in proportions?

    Hello! I conduct a survey in which I have a very large (approximately 800,000 records) set of numerical data (the data is financial data ...

    Started by Julie99‎, 05-02-2007 05:57 PM
    • Replies: 0
    • Views: 2,512
    05-02-2007, 05:57 PM Go to last post
  43. Stats Problem Help

    I am reviewing some old stats work to freshen up for a new job..They gave me some review stuff and this was one of the questions I am somewhat stuck...

    Started by Mike87T‎, 05-02-2007 09:16 AM
    • Replies: 0
    • Views: 2,336
    05-02-2007, 09:16 AM Go to last post
  44. Gold standart

    I have to devices Gold standard (PH) New Device 5.4 5.2 5.4 5.1 7 ...

    Started by ledamir‎, 05-02-2007 06:17 AM
    • Replies: 0
    • Views: 1,935
    05-02-2007, 06:17 AM Go to last post
  45. Normal Distribution

    Hi there , Im new to this forum. Does anyone know where I canfind notes on normal distribution? JAmes

    Started by jnm008‎, 05-02-2007 05:31 AM
    • Replies: 0
    • Views: 1,808
    05-02-2007, 05:31 AM Go to last post
  46. An interesting Bayesian question

    Suppose a random sample of size n is from uniform distribution U(0, exp(gamma)), suppose the prior distribution of gamma is N(a, b), how to find the...

    Started by sweetie‎, 05-02-2007 12:05 AM
    • Replies: 0
    • Views: 1,695
    05-02-2007, 12:05 AM Go to last post
  47. Help:Chi squared for homogeneity or goodness-of-fit?

    OK, I have removed the old message.

    Started by markmarkmark‎, 05-01-2007 06:14 PM
    • Replies: 0
    • Views: 3,214
    05-01-2007, 06:14 PM Go to last post
  48. Smile bonferroni's multiple comparison

    hi, do i have to use bonferroni's multiple comparison adjustment when i am doing analyses on multiple measurment of the same speciemn? thanxx

    Started by mia‎, 05-01-2007 10:22 AM
    • Replies: 0
    • Views: 2,856
    05-01-2007, 10:22 AM Go to last post
  49. Significance (research gone wrong, please help!)

    my convinience sample size was 148, i distributed questionnares (made up of rating scales) to all those in the sample. i had a response rate of 25. ...

    Started by ka_day‎, 04-30-2007 09:03 AM
    • Replies: 0
    • Views: 2,343
    04-30-2007, 09:03 AM Go to last post
  50. Independent t-test

    Alright I've really been struggling with this one so maybe I can find some help here. If, with the use of the independent t test, the null...

    Started by Joshu‎, 04-27-2007 11:51 PM
    • Replies: 1
    • Views: 4,360
    04-30-2007, 07:49 AM Go to last post
  51. please help... retaking an exam on t scores,

    Hi, I'm new here. I found this place on Google after two days of studying like mad and not understanding anything. well, sort of. Let me...

    Started by raefactor‎, 04-14-2007 09:18 PM
    • Replies: 2
    • Views: 2,226
    04-29-2007, 03:14 PM Go to last post
  52. another stats question

    the mahi rent-a-car company is intgerested in estimating the mean number of miles its cars areg driven on a particular holiday. it has 23000 cars...

    Started by equery‎, 04-29-2007 02:46 PM
    • Replies: 0
    • Views: 2,282
    04-29-2007, 02:46 PM Go to last post
  53. stats question

    can anyone help me with following Jim's chocolate chip cookies advertise an average of 5 chocolate chips per cookie. let x be the number of...

    Started by equery‎, 04-29-2007 02:40 PM
    • Replies: 0
    • Views: 2,246
    04-29-2007, 02:40 PM Go to last post
  54. Paired T-Test & Cross Validation

    I understand how to calculate the paired t-test but how should things be done differently if you're using 10 fold cross-validation? Also if I...

    Started by terminator‎, 04-29-2007 12:08 PM
    • Replies: 0
    • Views: 3,118
    04-29-2007, 12:08 PM Go to last post
  55. Question reporting linear mixed effects

    Hello, I am fitting a linear mixed effects model to data of a psycholinguistic experiment in which participants had to rate the naturalness of...

    Started by Tiepies‎, 04-29-2007 04:37 AM
    • Replies: 0
    • Views: 4,563
    04-29-2007, 04:37 AM Go to last post
  56. Mann whitney U help!

    Hiya, I have done 5 seperate mann whitney u tests, but I am having trouble finding the significance of my results. One book says to use the same...

    Started by fat_pie‎, 04-28-2007 09:06 AM
    • Replies: 0
    • Views: 5,028
    04-28-2007, 09:06 AM Go to last post
  57. Bowker

    How can I make a Bowker test in either spss or R? Please help, urgent! Thanks in advance Daniel

    Started by dani‎, 04-28-2007 08:47 AM
    • Replies: 0
    • Views: 1,958
    04-28-2007, 08:47 AM Go to last post
  58. Tests for Proportions

    :wave: In a hypothesis test for a proportion, why isn't it necessary to apply a continuity correction when converting phat to a z value?

    Started by JanNY47‎, 04-27-2007 09:38 AM
    • Replies: 0
    • Views: 2,358
    04-27-2007, 09:38 AM Go to last post
  59. Help!! Need advice on calculating percentiles

    Hi - Hoping I can get some opinions on the method we are using to calculate percentiles. I work with a small non-profit - I need to calculate...

    Started by jhall251‎, 04-25-2007 10:16 AM
    • Replies: 2
    • Views: 8,145
    04-26-2007, 02:20 PM Go to last post
  60. Help: Stats Project

    The project is to run regression analysis on 2 stocks compared to the S&P 500 and then do a write up about it. I did the regression analysis on excel...

    Started by StatsKills‎, 04-26-2007 12:00 AM
    • Replies: 2
    • Views: 3,605
    04-26-2007, 09:06 AM Go to last post

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