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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: 66,761
    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: 196,763
    07-16-2014, 11:01 AM Go to last post
  1. 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: 2,141
    05-23-2007, 10:29 AM Go to last post
  2. 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: 2,678
    05-24-2007, 07:52 AM Go to last post
  3. 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: 1,690
    05-24-2007, 09:13 AM Go to last post
  4. 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: 1,979
    05-24-2007, 10:06 AM Go to last post
  5. Smile getting yihat

    i have worked out the yi from a regression curve and i know that the yihat is the number predicted on the curve but how do i get it from using yi...

    Started by carl19_87@hotmail.com‎, 05-25-2007 10:46 AM
    • Replies: 0
    • Views: 2,108
    05-25-2007, 10:46 AM Go to last post
  6. need help...please

    Greetings, I'm studying stats independently online from my university so don't have a teacher to ask how to finish these question. Any help would...

    Started by PRESTIGE_350GT‎, 05-24-2007 02:52 PM
    • Replies: 1
    • Views: 1,979
    05-26-2007, 06:45 AM Go to last post
  7. Calculating Quality Level for a product

    Hi how can i calculate the overall quality level in ppm for a product in the month. this product produced in batches and these batches have...

    Started by exxol90‎, 05-28-2007 02:56 AM
    • Replies: 2
    • Views: 3,221
    05-28-2007, 02:01 PM Go to last post
  8. Data analysis question

    Suppose I had a set of mice that I induced an injury, and then looked for recovery based on a drug. I would split the group into treated and control...

    Started by jackRamsey‎, 05-29-2007 09:38 AM
    • Replies: 0
    • Views: 2,058
    05-29-2007, 09:38 AM Go to last post
  9. Question 2 Way ANOVA or lots of T-tests!!! Just cant get my head round it!!!!

    Hi everyone, I really cant get my head round which test i am supposed to use and every time i think i have it sorted in my head, i change my mind,...

    Started by mbxhjl‎, 05-30-2007 03:02 AM
    • Replies: 1
    • Views: 2,484
    05-31-2007, 11:41 AM Go to last post
  10. statistically compare two rates

    -The previous thread was difficult to read- I am currently working on a project and have calculated two injury rates. I am looking to get a p-value...

    Started by chrism‎, 05-31-2007 01:18 PM
    • Replies: 0
    • Views: 3,943
    05-31-2007, 01:18 PM Go to last post
  11. Which test to compare two populations

    Hi All, New to this forum as I just need some human input re this question. I have googled and read, gone over all my stats notes form Uni but...

    Started by mysterymouse‎, 05-31-2007 10:21 PM
    • Replies: 1
    • Views: 2,510
    06-01-2007, 11:15 AM Go to last post
  12. Collapsing rules for a 3 way ANOVA

    Hi I'm trying to analzye some data, and I want to be sure that I am doing it correctly. Here is the situation. I have a 3 way interaction that is...

    Started by thoughtsofugh2‎, 06-01-2007 03:31 PM
    • Replies: 0
    • Views: 4,654
    06-01-2007, 03:31 PM Go to last post
  13. Breakdown point ???

    what is the breakdown point of each of the following estimators. 1) the sample mean 2) The sample median 3) the least squares estimator of the...

    Started by sokol‎, 06-01-2007 03:38 PM
    • Replies: 0
    • Views: 2,971
    06-01-2007, 03:38 PM Go to last post
  14. Question Test for outliers

    I have a set of concentrations of lead in soil from samples taken at random (spatially) across a 20m x 20m area. The data fit a normal distribution...

    Started by FRA‎, 06-02-2007 07:50 AM
    • Replies: 0
    • Views: 5,311
    06-02-2007, 07:50 AM Go to last post
  15. When to declare a "dead heat" when testing ads?

    So I do a bit of online advertising for different websites. I always alternate between two slightly different ads to see which on gets the higher...

    Started by MK.Jackson‎, 05-29-2007 12:29 AM
    • Replies: 2
    • Views: 2,129
    06-02-2007, 11:58 AM Go to last post
  16. anova

    Two students performed a penny toss experiment, repeatedly tossing 20 pennies and counting the heads that appeared. The results look odd and you...

    Started by jmrapo‎, 06-02-2007 08:30 PM
    • Replies: 0
    • Views: 1,542
    06-02-2007, 08:30 PM Go to last post
  17. Finding the p-values of the intercept and slope (regression)

    From my simple made-up dataset. 1 12 5 17 7 23 8 9 9 14 I performed a simple regression analysis.

    Started by excoder‎, 06-02-2007 08:45 PM
    • Replies: 0
    • Views: 2,979
    06-02-2007, 08:45 PM Go to last post
  18. Need help with case in statistics

    Hi there! I have just received a case analysis which will in part be basis for my coming exam in statistics. There are no restrictions concerning...

    Started by eraserhead‎, 06-02-2007 11:55 AM
    • Replies: 1
    • Views: 2,431
    06-03-2007, 02:11 AM Go to last post
  19. Filling in missing values

    I subscribed to TalkStats less than an hour ago. This isn't a homework question, so I hope that's OK. I embarrassed to say I passed a college-level...

    Started by Johnny‎, 05-18-2007 07:53 AM
    • Replies: 3
    • Views: 4,958
    06-03-2007, 07:25 AM Go to last post
  20. Multinomial Distribution Trouble

    I have a homework problem as follows: "You have a deck of 52 cards and take out 35 cards, one-at-a-time with replacement. What is the probability of...

    Started by mandsrix‎, 06-03-2007 01:02 PM
    • Replies: 0
    • Views: 2,688
    06-03-2007, 01:02 PM Go to last post
  21. Likert Scale Analysis

    I am writing a paper that will have 10 questions; respondents will answer using a 5-Point Likert Scale. Try as I might, I can't figure out what type...

    Started by bohica‎, 06-03-2007 08:35 PM
    • Replies: 1
    • Views: 4,077
    06-03-2007, 11:29 PM Go to last post
  22. Smile inter-rater reliability question

    I'm trying to help a colleague and haven't done this kind of analyses in ages. Can't remember what might be best to use for inter-rater reliability....

    Started by statgirl72‎, 05-31-2007 11:45 AM
    • Replies: 2
    • Views: 3,009
    06-04-2007, 10:16 AM Go to last post
  23. matched or unmatched

    Hi everyone i'm in trouble well, in case-control study matched for age and sex only should i conduct matched or unmatched analysis? i need to...

    Started by Ghada‎, 06-04-2007 01:23 PM
    • Replies: 0
    • Views: 3,853
    06-04-2007, 01:23 PM Go to last post
  24. Moved: SPSS -Multinomial Logistic Regression

    Started by malaika‎, 08-04-2008 09:36 PM
    • Replies: -
    • Views: -
    06-04-2007, 02:36 PM Go to last post
  25. time series data question

    Hi All, I hope someone can help me with this. I am trying to analyse time-series data. I have three data collection points pre-intervention and...

    Started by JMc77‎, 06-06-2007 09:44 AM
    • Replies: 0
    • Views: 3,101
    06-06-2007, 09:44 AM Go to last post
  26. Comparing a sample with a mean

    I'm supposed to compare the increase in Oslo Stock Exchange with the increase in shares that were recommended at least 12 times. The increase in the...

    Started by eraserhead‎, 06-04-2007 02:52 AM
    • Replies: 1
    • Views: 2,377
    06-06-2007, 11:50 AM Go to last post
  27. Analysing variance

    Can anyone direct me to a suitable statistical test for the following? I want to evaluate the mean and variance for data from a nested survey...

    Started by astrofin‎, 06-05-2007 02:16 AM
    • Replies: 1
    • Views: 2,173
    06-06-2007, 12:02 PM Go to last post
  28. Analyzing Likert Scores

    Hi - from this thread you'll be able to ascertain my very low skill levels when it comes to statistics! Here is your chance to give me the answer and...

    Started by Varnesh‎, 06-06-2007 07:45 AM
    • Replies: 2
    • Views: 5,115
    06-06-2007, 05:56 PM Go to last post
  29. Finding standard deviation difference t-test?

    Ok, I know the to find the mean difference, it's basically, the mean of C1 - C2. But how where did the 2.38 in the StdDev come from? It's surely not...

    Started by excoder‎, 06-07-2007 03:15 AM
    • Replies: 0
    • Views: 6,058
    06-07-2007, 03:15 AM Go to last post
  30. statistics Books

    Hi everybody, I am new to this forum. I am a technical Analyst. I do analysis for Computer Systems using statistics. I am interested to learn...

    Started by NeerajDBA‎, 05-15-2007 12:56 AM
    • Replies: 10
    • Views: 6,524
    06-07-2007, 09:12 AM Go to last post
  31. Lightbulb Looking for contributors

    Do you have a background or interest in math or statistics? Do you enjoy helping people, especially beginners, understand a complex concept? ...

    Started by quark‎, 06-07-2007 09:56 PM
    • Replies: 0
    • Views: 3,956
    06-07-2007, 09:56 PM Go to last post
  32. Homewoek Question Help

    I am trying to help someone with a statistics problem. I have taken the course but can't remember a lot. Please let me know if you have any help. ...

    Started by lbdanielle‎, 06-07-2007 10:40 PM
    • Replies: 0
    • Views: 5,232
    06-07-2007, 10:40 PM Go to last post
  33. how to test mutual exlusion? (more than negative correlation)

    I have a dataset with more than a negative correlation - there is mutual exclusion going on. A scatter plot of the two variables of interest gives...

    Started by EricPeterson‎, 06-09-2007 01:28 AM
    • Replies: 0
    • Views: 2,802
    06-09-2007, 01:28 AM Go to last post
  34. Easy (?) question regarding Mean Reversion / Persistence

    Hi all, I am doing a simple regression with accounting data. I regress current earnings (E_t) on the earnings of the previous periods, i.e....

    Started by rtd‎, 06-06-2007 11:44 AM
    • Replies: 3
    • Views: 2,369
    06-09-2007, 03:13 AM Go to last post
  35. Stats for linguists

    Hi all. I've been working on my PhD for a year and a half now, and I'm still no further forward in understanding how statistics works. At the...

    Started by TheKingOfGlasgow‎, 06-12-2007 09:52 AM
    • Replies: 0
    • Views: 1,835
    06-12-2007, 09:52 AM Go to last post
  36. percentile rank

    I need to know with a mean of 500 and a standard deviation of 100 how I would find the percentile ranking for the top 10% of a group.... AAAAAAAAGGG

    Started by Griz‎, 06-12-2007 08:52 AM
    • Replies: 3
    • Views: 3,895
    06-12-2007, 06:01 PM Go to last post
  37. Relatively simple questions...

    I'm analyzing survey data from four different groups. Group 1, n=249 Group 2, n=216 Group 3, n=147 Group 4, n=33 I ran an ANOVA using a some...

    Started by qualresearcher‎, 06-12-2007 08:20 PM
    • Replies: 0
    • Views: 3,413
    06-12-2007, 08:20 PM Go to last post
  38. Demand/Supply estimate model help, please!

    hi, i'm attempting to create a demand estimate and supply model to measure HR data for class. The end reuslt to be able to predict exit/incoming...

    Started by isles1987‎, 06-12-2007 08:21 PM
    • Replies: 0
    • Views: 2,641
    06-12-2007, 08:21 PM Go to last post
  39. Segment Allocation

    Hi, I'm a new user to this forum so apologies if i've posted in the wrong area. My problem is to do with allocating segments to a database. A...

    Started by doncarlini‎, 06-13-2007 05:14 AM
    • Replies: 0
    • Views: 1,924
    06-13-2007, 05:14 AM Go to last post
  40. Significance tests

    Hi, I'm working on basic data profiles for sample groups - volume, proportion percentage and index to universe - and am using z-scores to define...

    Started by doncarlini‎, 06-13-2007 05:26 AM
    • Replies: 0
    • Views: 1,848
    06-13-2007, 05:26 AM Go to last post
  41. Simple Question

    If you wish to perform a simple linear regression on two variables but have no intuition as to which to use as the independent variable, which should...

    Started by ts04‎, 06-04-2007 10:12 AM
    • Replies: 5
    • Views: 2,448
    06-13-2007, 10:04 AM Go to last post
  42. Unhappy Chi- square and ANOVA journal examples

    HI There This is my first post, I have spent 2 days looking through my Ultrasound journals and online journals for examples of : ANOVA table...

    Started by rocco2‎, 06-14-2007 01:19 AM
    • Replies: 1
    • Views: 7,198
    06-14-2007, 01:20 AM Go to last post
  43. Average Hours

    We have the following data and we need to find average hours it takes to complete one item in CNC Item Quantity HOurs Applied Dept A 1 ...

    Started by agovindasamy‎, 06-08-2007 11:33 AM
    • Replies: 3
    • Views: 3,191
    06-14-2007, 10:51 AM Go to last post
  44. spatial statistics: bivariate (cross) k-function vs k-function difference

    Dear list, I want to assess if a series of cases (farms positive for a disease) are spatially clustered by comparing them to the general...

    Started by berto‎, 06-17-2007 10:34 AM
    • Replies: 0
    • Views: 5,047
    06-17-2007, 10:34 AM Go to last post
  45. Help Required with Course Work

    Hi, First post so here goes. I have some uni course work which I would appreciate a view on: We have been given a list of data and asked...

    Started by dogz111‎, 06-11-2007 02:58 PM
    • Replies: 4
    • Views: 2,449
    06-17-2007, 10:46 AM Go to last post
  46. Spearmans Rank question

    I am looking to test whether region (North / South) determines job satisfaction (graded 1 to 5). I have created the following table. Job...

    Started by dogz111‎, 06-17-2007 10:45 AM
    • Replies: 1
    • Views: 2,448
    06-17-2007, 06:04 PM Go to last post
  47. highest correlation

    How do I find the strongest correlation? Question:r=.32, r=.65, r=-.68, r=.57, r=-.49 I think the highest correlation is r=-.68. It shows a...

    Started by latonya1‎, 06-17-2007 12:23 PM
    • Replies: 2
    • Views: 3,946
    06-18-2007, 01:32 AM Go to last post
  48. power analysis / sample sizes for factorial designs

    Greetings, I'm interested in calculating the power (or sample sizes required for a power) for factorial designs. As an example, if I have a...

    Started by babucher‎, 05-24-2007 10:03 AM
    • Replies: 2
    • Views: 6,389
    06-18-2007, 08:52 AM Go to last post
  49. Converting scores to a metric

    Scores for the AAT are reported with a mean of 80 and a standard deviation of 8. Martina received a raw score of 84 on the math portion of the AAT. ...

    Started by latonya1‎, 06-17-2007 01:14 PM
    • Replies: 8
    • Views: 4,180
    06-18-2007, 12:48 PM Go to last post
  50. Question spearman's rho

    Hello I am working with a non random sample of mainly ordinal data and am using Spearman's rho to look at the relationships between variables. I...

    Started by pinky‎, 06-18-2007 04:05 PM
    • Replies: 0
    • Views: 4,266
    06-18-2007, 04:05 PM Go to last post
  51. Likert Scale Survey - Stats

    Question - I am using a likert scale survey to gather information for a correlational research question. What would be the appropriate data analysis...

    Started by rick917‎, 06-13-2007 09:06 PM
    • Replies: 1
    • Views: 3,276
    06-18-2007, 04:52 PM Go to last post
  52. test-retest reliability & sample size

    deleted msg, wrong forum

    Started by gga‎, 06-18-2007 05:52 PM
    • Replies: 0
    • Views: 5,714
    06-18-2007, 05:52 PM Go to last post
  53. Prediction Interval Question

    I'm working on a problem and need some help. Hope this is the right place. I ran a regression analysis on some data and came up with a model that...

    Started by xfilesfan‎, 06-18-2007 08:50 PM
    • Replies: 1
    • Views: 3,803
    06-19-2007, 12:13 AM Go to last post
  54. What is better: higher number of participants or identical participants?

    Dear all, I am a language teacher and currently conducting a research project into vocabulary acquisition. For this project, I had a setup of 1...

    Started by apricot crumble‎, 06-17-2007 08:38 PM
    • Replies: 5
    • Views: 4,266
    06-19-2007, 08:49 AM Go to last post
  55. Normal Distribution Question

    Need Help!!! Here is the problem: The National Center for Educational Statistics report that in the year ending 2003 some 400,000 students took...

    Started by latonya1‎, 06-16-2007 03:57 PM
    • Replies: 14
    • Views: 4,007
    06-19-2007, 08:38 PM Go to last post
  56. Democrats and Republicans

    Compute the test statistic used to test the null hypothesis that p1=p2. In a vote on the Clean Water bill, 41% of the 205 Democrats voted for the...

    Started by rzum‎, 06-19-2007 08:52 PM
    • Replies: 1
    • Views: 4,677
    06-20-2007, 05:32 AM Go to last post
  57. Dependent Data

    The differences between two sets of dependent data are -3, -21, -12, -3, -27. Find Sd. Thank you to anyone in advance! :)

    Started by avanbel2‎, 06-19-2007 08:54 PM
    • Replies: 1
    • Views: 5,797
    06-20-2007, 05:43 AM Go to last post
  58. Question chow test

    Hi everybody, I've got a problem with Chow Test about structural break... in fact on the base of my knowledge I think that this test can be used...

    Started by sciacallojo‎, 06-21-2007 11:28 AM
    • Replies: 0
    • Views: 4,479
    06-21-2007, 11:28 AM Go to last post
  59. Curve Fitting / Regression

    I've a system of equations of the form w(i)=a(i)*x1 + b(i)*x2 + c(i)*x3 + d(i)*x4 where a,b,c and d are observed/registered variables for each...

    Started by nirvana‎, 06-22-2007 08:30 PM
    • Replies: 0
    • Views: 2,096
    06-22-2007, 08:30 PM Go to last post
  60. Simple Problem

    Im looking to analyze a problem with data similar (but more complex) to the data below 111 111 111 111 111 111 111 101

    Started by MetS‎, 06-21-2007 03:19 PM
    • Replies: 3
    • Views: 3,439
    06-23-2007, 03:29 PM Go to last post

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