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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: 197,315
    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: 67,061
    09-30-2005, 09:44 AM Go to last post
  1. I need help on this question

    There are __________ possible ways that eight pictures can be hung on a wall.:yup:

    Started by HeatherBelle09‎, 06-28-2007 09:16 AM
    • Replies: 1
    • Views: 1,934
    06-29-2007, 02:19 AM Go to last post
  2. Red face I need some help with this one.....please

    :confused: Box A contains the numbers 1, 2, 3, and 4. Box B contains the numbers 5, 6, 7, and 8. A number is first drawn from Box A and then another...

    Started by HeatherBelle09‎, 06-28-2007 02:41 PM
    • Replies: 1
    • Views: 4,256
    06-29-2007, 02:13 AM Go to last post
  3. More help.....

    :( The staff at a small company includes: 4 secretaries, 20 technicians, 4 engineers, 2 executives, and 50 factory workers. If a person is selected...

    Started by HeatherBelle09‎, 06-28-2007 02:42 PM
    • Replies: 1
    • Views: 1,668
    06-29-2007, 02:12 AM Go to last post
  4. So confused.........

    First one........ In a second grade class containing 14 girls and 7 boys, 2 students are selected at random to give out the math papers. What is the...

    Started by HeatherBelle09‎, 06-28-2007 02:45 PM
    • Replies: 0
    • Views: 5,585
    06-28-2007, 02:45 PM Go to last post
  5. Still need some help......

    :( A business has seven locations to choose from and wishes to rank only the top three locations. How many different ways can this be done? and...

    Started by HeatherBelle09‎, 06-28-2007 02:43 PM
    • Replies: 0
    • Views: 1,963
    06-28-2007, 02:43 PM Go to last post
  6. Variance and Covariance

    My question could be very easy or not. Sorry about two quenstions my level of english an my ignorancy. I want to now why when we estimate the...

    Started by EconometricEngel‎, 06-28-2007 09:28 AM
    • Replies: 1
    • Views: 2,028
    06-28-2007, 02:37 PM Go to last post
  7. IQ scores

    Assume that adults have normally distributed IQ scores with a mean of 100 and a standard dviation of 15. Find the probability that a randomly...

    Started by lolo619‎, 06-28-2007 08:42 AM
    • Replies: 1
    • Views: 4,019
    06-28-2007, 12:01 PM Go to last post
  8. Exclamation IntrArater Reliability

    Can I calculate intrarater reliability using a single measure within a multiple subject system design? Can intrarater reliability be found without...

    Started by christina M‎, 06-19-2007 01:54 AM
    • Replies: 1
    • Views: 4,086
    06-27-2007, 07:16 PM Go to last post
  9. Quality Assurance in Materials Manufacturing

    Hey Everyone, So i have been given this task to try and quantify the changes seen due a certain material manufacturing process. I.e. i have Sample...

    Started by koji1324‎, 06-25-2007 11:29 AM
    • Replies: 1
    • Views: 2,252
    06-26-2007, 08:59 PM Go to last post
  10. Does this compound extend the model organism's lifespan?

    Hello, I am testing an experimental drug on snails in a small pilot study. The compound has the desired effect in vivo that we are looking for. ...

    Started by Subtle Guest‎, 04-23-2007 09:06 AM
    • Replies: 3
    • Views: 2,439
    06-25-2007, 07:38 PM Go to last post
  11. Repeated Measures vs. Randomized Groups

    Can someone please explain to me why tests of significance are more powerful if they can use correlated repeated measures rather than randomized...

    Started by Sandybar‎, 06-25-2007 03:42 PM
    • Replies: 2
    • Views: 3,315
    06-25-2007, 04:53 PM Go to last post
  12. 3-option poll and significance

    Is it possible to test for significance in this situation? As part of my summer internship required for school, I had to poll employees at the...

    Started by Beth08‎, 06-14-2007 02:00 PM
    • Replies: 2
    • Views: 2,737
    06-25-2007, 01:05 PM Go to last post
  13. Simple question, difficult problem

    Hi, First I have to admit that my knowledge in statistics is very basic. I'm a surgeon (that explains the reason). I'm trying to conduct a...

    Started by bennyorit‎, 06-20-2007 11:50 PM
    • Replies: 3
    • Views: 2,431
    06-25-2007, 01:58 AM Go to last post
  14. Stat questions

    A custom bicycle manufacturer has had to deal with an increased rate of returned bicycles in recent months. Customers are returning bikes because...

    Started by vball35‎, 06-24-2007 11:01 PM
    • Replies: 0
    • Views: 2,479
    06-24-2007, 11:01 PM Go to last post
  15. how do you combine standard errors into one

    I would like to display some data in a bar graph. Each column on the x-axis is composed of two values to give a larger total. I have standard errors...

    Started by plis‎, 06-24-2007 02:17 PM
    • Replies: 0
    • Views: 5,107
    06-24-2007, 02:17 PM Go to last post
  16. 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: 3,472
    06-23-2007, 03:29 PM Go to last post
  17. 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: 2,122
    06-22-2007, 08:30 PM Go to last post
  18. 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: 4,513
    06-21-2007, 11:28 AM Go to last post
  19. 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: 5,835
    06-20-2007, 05:43 AM Go to last post
  20. 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: 4,727
    06-20-2007, 05:32 AM Go to last post
  21. 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: 4,050
    06-19-2007, 08:38 PM Go to last post
  22. 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: 4,309
    06-19-2007, 08:49 AM Go to last post
  23. 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: 3,848
    06-19-2007, 12:13 AM Go to last post
  24. test-retest reliability & sample size

    deleted msg, wrong forum

    Started by gga‎, 06-18-2007 05:52 PM
    • Replies: 0
    • Views: 5,756
    06-18-2007, 05:52 PM Go to last post
  25. 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: 3,320
    06-18-2007, 04:52 PM Go to last post
  26. 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: 4,302
    06-18-2007, 04:05 PM Go to last post
  27. 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: 4,205
    06-18-2007, 12:48 PM Go to last post
  28. 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: 6,452
    06-18-2007, 08:52 AM Go to last post
  29. 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: 3,977
    06-18-2007, 01:32 AM Go to last post
  30. 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: 2,480
    06-17-2007, 06:04 PM Go to last post
  31. 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: 2,472
    06-17-2007, 10:46 AM Go to last post
  32. 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: 5,104
    06-17-2007, 10:34 AM Go to last post
  33. 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: 3,238
    06-14-2007, 10:51 AM Go to last post
  34. 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: 7,241
    06-14-2007, 01:20 AM Go to last post
  35. 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: 2,476
    06-13-2007, 10:04 AM Go to last post
  36. 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: 1,883
    06-13-2007, 05:26 AM Go to last post
  37. 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: 1,950
    06-13-2007, 05:14 AM 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: 2,664
    06-12-2007, 08:21 PM Go to last post
  39. 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: 3,444
    06-12-2007, 08:20 PM Go to last post
  40. 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: 3,947
    06-12-2007, 06:01 PM Go to last post
  41. 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: 1,913
    06-12-2007, 09:52 AM Go to last post
  42. 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: 2,408
    06-09-2007, 03:13 AM Go to last post
  43. 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: 2,844
    06-09-2007, 01:28 AM Go to last post
  44. 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: 5,281
    06-07-2007, 10:40 PM Go to last post
  45. 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: 3,977
    06-07-2007, 09:56 PM Go to last post
  46. 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: 6,561
    06-07-2007, 09:12 AM Go to last post
  47. 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: 6,097
    06-07-2007, 03:15 AM Go to last post
  48. 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: 5,151
    06-06-2007, 05:56 PM Go to last post
  49. 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: 2,182
    06-06-2007, 12:02 PM Go to last post
  50. 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: 2,394
    06-06-2007, 11:50 AM Go to last post
  51. 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: 3,145
    06-06-2007, 09:44 AM Go to last post
  52. 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
  53. 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: 3,878
    06-04-2007, 01:23 PM Go to last post
  54. 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: 3,036
    06-04-2007, 10:16 AM Go to last post
  55. 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: 4,098
    06-03-2007, 11:29 PM Go to last post
  56. 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: 2,720
    06-03-2007, 01:02 PM Go to last post
  57. 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: 5,005
    06-03-2007, 07:25 AM Go to last post
  58. 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: 2,451
    06-03-2007, 02:11 AM Go to last post
  59. 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: 3,018
    06-02-2007, 08:45 PM Go to last post
  60. 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: 1,554
    06-02-2007, 08:30 PM Go to last post

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