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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: 197,168
    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: 66,955
    09-30-2005, 09:44 AM Go to last post
  1. Average Tenure and Employee Attrition

    Hi All, My company's attrition rate is about 25%. A senior member of the organization believes that because the attrition rate is 25%, this means...

    Started by dbats‎, 11-25-2012 06:09 AM
    • Replies: 0
    • Views: 2,593
    11-25-2012, 06:09 AM Go to last post
  2. Help with inter-rate reliability calculation with multiple raters and nominal data

    I have 12 raters. Each of them is going to rate if a patient needs a certain diagnostic test. The answer is yes or no. I would like to calculate the...

    Started by Sophie500‎, 11-24-2012 11:01 PM
    • Replies: 0
    • Views: 1,937
    11-24-2012, 11:01 PM Go to last post
  3. Help finding probability with sample mean & standard deviation

    Can anyone help me on how to do this problem? I'm so confused

    Started by Laura123‎, 11-24-2012 07:48 PM
    • Replies: 2
    • Views: 2,130
    11-24-2012, 10:00 PM Go to last post
  4. Please assist with this question?

    In a recent survey by the Miami Mental Health Clinic, Miami's general population prevalence mental health illnesses yielded the following data: 21...

    Started by makusaki1337‎, 11-24-2012 08:23 PM
    • Replies: 2
    • Views: 1,778
    11-24-2012, 09:45 PM Go to last post
  5. Assess hedonic regression

    Hi, I'm going to be involved in an asssignment using hedonic regression on real estate appraisal. It is a part of an index for dwellings. My task...

    Started by opelastra‎, 11-24-2012 05:17 PM
    • Replies: 1
    • Views: 1,388
    11-24-2012, 05:18 PM Go to last post
  6. regression output

    dear all, if the t statistic is between +2 and -2, does it always mean that there is no relation between the two variables in the regression...

    Started by gihan‎, 11-24-2012 05:10 PM
    • Replies: 0
    • Views: 1,129
    11-24-2012, 05:10 PM Go to last post
  7. Not sure what I'm being asked!

    Hi all! I'm wondering if someone could help clarify a question in my stats assignment. I am quite confused about what I am being asked to do! ...

    Started by datura‎, 11-24-2012 04:09 PM
    • Replies: 0
    • Views: 1,178
    11-24-2012, 04:09 PM Go to last post
  8. Kruskal Wallis or One way analysis of variance- which is more suitable?

    Hello, I am currently working on an assignment which describes 2 clinical trial scenarios. I will outline both first: 1)Compare the...

    Started by StudiousEm‎, 11-23-2012 05:43 PM
    • Replies: 7
    • Views: 1,634
    11-24-2012, 01:59 PM Go to last post
  9. Doing a stats assignment with R. Would love some advice on what stats tests to run

    We've been given data for 9 different genomes of fruitfly. These have then been split into 3 groups based on their overall effect on the fly's...

    Started by Cam‎, 11-20-2012 05:23 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 3,334
    11-24-2012, 12:22 PM Go to last post
  10. Durbin-Watson of 1.97

    Hi there, I ran the Durbin-Watson test for my dataset. n = 744 (sample), k = 9 (variables) My result is a DW of 1.97. SPSS does not show...

    Started by fxen3k‎, 11-23-2012 03:18 AM
    durbin watson, durbin-watson, interpretation, test statistic
    • Replies: 6
    • Views: 1,968
    11-23-2012, 06:31 PM Go to last post
  11. P1 Exam Practice Update

    I now have a 10 question 1 hour practice test and a 20 question 2 hour practice test... I am working on creating some online practice tests to...

    Started by geniuslikeme‎, 11-23-2012 04:15 PM
    • Replies: 0
    • Views: 1,152
    11-23-2012, 04:15 PM Go to last post
  12. Data mining MS SQL 2012 vs. statistics in SPSS

    Guys! I'm doing a research about factors correlated with AV fistula (dialysis blood approach). I have 195 cases and used them for data mining with...

    Started by keops9876‎, 11-23-2012 04:14 PM
    • Replies: 0
    • Views: 2,529
    11-23-2012, 04:14 PM Go to last post
  13. Analyzing data. Unsure which test to use

    It has been a LONG time since my last stat course. Working on an experiment with a student in my science class who is looking at the effects of trace...

    Started by dwilliams‎, 11-23-2012 08:50 AM
    • Replies: 1
    • Views: 989
    11-23-2012, 01:00 PM Go to last post
  14. Population testing - Suitable Tests?

    Problem solved :-) Thanks.

    Started by BiscuitJohn‎, 11-22-2012 03:36 PM
    • Replies: 1
    • Views: 798
    11-22-2012, 04:50 PM Go to last post
  15. Application Specific: Strange behaviour of students T-test compared to std.dev plots

    Hello all, ******************************************************************** SEE THE FITH POST OF THIS THREAD TO GET A BETTER IDEA OF THE ISSUE...

    Started by ngio‎, 11-20-2012 12:15 PM
    • Replies: 7
    • Views: 1,745
    11-22-2012, 01:50 PM Go to last post
  16. Chi square and relative risk

    Hi, I am using Chi Square to test if two variables are associated with each other, I am also calculating the relative risk. Howver, does it...

    Started by kapa‎, 11-22-2012 04:24 AM
    • Replies: 0
    • Views: 3,045
    11-22-2012, 04:24 AM Go to last post
  17. Detecting outliers in Negative Binomial Regression

    Hi all! I am conducting a negative binomial regression for my statistics project. I have been looking online about how to detect outliers but am...

    Started by steph88‎, 11-21-2012 08:53 PM
    outliers, spss
    • Replies: 2
    • Views: 4,579
    11-22-2012, 03:30 AM Go to last post
  18. Which test should I use? Categorical variable vs continuous

    Hi! I have a set of data with the heights of individuals, and each individual is associated with a categorical variable (success/failure). I want...

    Started by sassal‎, 11-21-2012 12:21 PM
    • Replies: 5
    • Views: 937
    11-21-2012, 09:53 PM Go to last post
  19. P1 Exam Practice

    I am trying to make an online practice exam for people preparing for the p1 actuarial exam. I just set something up and I hope some of you may be...

    Started by geniuslikeme‎, 11-21-2012 02:36 PM
    • Replies: 2
    • Views: 1,550
    11-21-2012, 03:04 PM Go to last post
  20. Need some advice on normality and tests

    Hi, First I would like to thank you for this wonderful forum with lots of useful information :) I have two samples for which I'm trying to...

    Started by sika64‎, 11-20-2012 08:31 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 3,575
    11-21-2012, 02:32 PM Go to last post
  21. Show that a sample size is too small for reliable results?

    Hi, I have a simple question about sample sizes I was hoping someone could help me with: A test subject drinks from 4 different glasses of water...

    Started by Nimtrix‎, 11-21-2012 09:40 AM
    • Replies: 9
    • Views: 3,370
    11-21-2012, 02:05 PM Go to last post
  22. Binomial GLM- Remove one variable to see effect of another?

    For my assignment, we've essentially been given data on flies with 3 variables: Genome, Wing size, Mating outcome. We have a range of genomes, and...

    Started by Cam‎, 11-21-2012 12:36 PM
    • Replies: 0
    • Views: 790
    11-21-2012, 12:36 PM Go to last post
  23. Which test do I use?

    Hi, I'm struggling to figure out exactly which test I should use to test the following data: Group N % Low 203 50.09 Medium...

    Started by mr_bennyc‎, 11-21-2012 11:23 AM
    • Replies: 2
    • Views: 1,129
    11-21-2012, 11:43 AM Go to last post
  24. How many subjects are between X and Y cm tall?

    I have a group "G" of unknown size containing height values for men. I've been working with a sample from this group, and now I get the question: ...

    Started by Nimtrix‎, 11-21-2012 09:54 AM
    • Replies: 4
    • Views: 1,540
    11-21-2012, 11:18 AM Go to last post
  25. How do you find a 90% confidence interval???

    Independent random samples of n1 = 600 and n2 = 430 observations were selected from binomial populations 1 and 2, and x1 = 333 and x2 = 376 successes...

    Started by jessicasamide‎, 11-20-2012 11:58 PM
    • Replies: 1
    • Views: 2,701
    11-21-2012, 08:43 AM Go to last post
  26. Testing for similarity vs dissimilarity

    Hi all, I'm a grad student who uses stats a lot but who has very little formal training. Not sure if this is in the right forum, so feel free to...

    Started by Qroid_mtl‎, 11-20-2012 02:49 PM
    • Replies: 11
    • Views: 3,373
    11-21-2012, 08:37 AM Go to last post
  27. Subtract a known inaccuracy

    I'm stuck on a statistics problem that I'll use an example to describe. A person is hired to measure the length of 50 people. Because he's sloppy...

    Started by Russeldog‎, 11-21-2012 04:48 AM
    • Replies: 1
    • Views: 1,079
    11-21-2012, 05:01 AM Go to last post
  28. spss..comparing means

    I spent 50 hours on this project , polished it, shined it and escorted it to my professor only to find I mismanaged what i thought was the easiest...

    Started by bruthless77‎, 11-20-2012 09:40 PM
    • Replies: 1
    • Views: 959
    11-20-2012, 10:36 PM Go to last post
  29. 2 way ANOVA, multiple response variables.

    Hello everyone, I would like to perform a 2-factor anova test, but I have some doubts. I'm working with mice in which we assess multiple...

    Started by Dusan11‎, 11-20-2012 01:50 PM
    • Replies: 2
    • Views: 4,120
    11-20-2012, 05:59 PM Go to last post
  30. Quick question on reporting statistics on 2x2 ANOVA

    Hey guys! I just have a quick question regarding whether I've reported everything I need to for a 2x2 ANOVA. You can skip the description if it's too...

    Started by Nrwrit3r‎, 11-20-2012 04:46 PM
    • Replies: 0
    • Views: 2,145
    11-20-2012, 04:46 PM Go to last post
  31. Hypothesis Testing Question Help

    I've been lurking for some time now, soaking up knowledge, but now I'm stuck on finding p-values for the following question. Q: A board game...

    Started by zigzager‎, 11-18-2012 03:18 AM
    • Replies: 11
    • Views: 2,880
    11-20-2012, 04:37 PM Go to last post
  32. Error on the standard deviation, skewness & Kurtosis

    Dear all, Given a sample of N points extracted from a distribution, I would like to know how to estimate the error on the higher moments of the...

    Started by poi‎, 11-19-2012 05:02 AM
    error estimation, kurtosis, skewness, standard deviation, statistics
    • Replies: 3
    • Views: 4,299
    11-20-2012, 05:50 AM Go to last post
  33. How do you find the population mean?

    Find a 90% one-sided upper confidence bound for the population mean μ for these values. (Round your answers to two decimal places.) (a) n = 34,...

    Started by jessicasamide‎, 11-19-2012 09:02 PM
    • Replies: 1
    • Views: 2,975
    11-19-2012, 09:29 PM Go to last post
  34. combining estimate moe and translating into percentage

    Hey all, This is my first post, sooo glad I found you guys. All the information has been invaluable to me. I spent 15 mins or so trying to search...

    Started by cetch‎, 11-19-2012 09:39 AM
    • Replies: 3
    • Views: 2,325
    11-19-2012, 03:27 PM Go to last post
  35. Standard deviation of Sample vs. Standard deviation of mean

    Hi, I have a very basic confusion. What exactly is the difference between them? Can you also give a simple example? Thanks guys

    Started by Vatsa‎, 11-19-2012 02:35 PM
    standard deviation
    • Replies: 0
    • Views: 1,062
    11-19-2012, 02:35 PM Go to last post
  36. Post t-test vs. chi-square test; Sampling Size for educational study (Cochran equation)

    Hi there, I had a few questions relating to statistics in my study. I am a bit of a noob in stats so bear with me... The goal of my project is...

    Started by tloke‎, 11-19-2012 04:53 AM
    • Replies: 0
    • Views: 2,712
    11-19-2012, 04:53 AM Go to last post
  37. Help explaining median!

    Good morning, I'm currently speaking with members of the management at my place of work regarding a new method of measurement at my place of work....

    Started by Ioannes‎, 11-18-2012 05:37 AM
    • Replies: 1
    • Views: 1,915
    11-18-2012, 07:25 PM Go to last post
  38. Supposedly easy question

    Hi guys, I've been struggling with this supposedly easy question. I wonder whether you can help me with it. I ran an experiment with a...

    Started by moussamoussa‎, 11-17-2012 01:41 PM
    • Replies: 1
    • Views: 1,053
    11-18-2012, 05:52 AM Go to last post
  39. Question regarding log transformations.

    I am doing a statistics project for my class and the question reads as follows: "Fit a linear model that could be used to answer whether or not a...

    Started by alexparij‎, 11-11-2012 06:26 PM
    • Replies: 1
    • Views: 1,424
    11-17-2012, 06:46 PM Go to last post
  40. Exclamation Urgent simple question re One Way vs. Univariate ANOVA

    Hi. I'm trying to decipher some SPSS output. Using syntax, it ran a Univariate ANOVA. My question is, is this the same thing as a One Way ANOVA?? ...

    Started by Kidara‎, 10-05-2012 11:23 PM
    • Replies: 3
    • Views: 6,332
    11-17-2012, 06:42 PM Go to last post
  41. Unhappy Between Subjets Test Help

    Hi there, I am examining digit span and gist memory in older and younger groups, and also comparing groups on education level to see that has an...

    Started by kerrimaree‎, 11-16-2012 07:02 PM
    • Replies: 0
    • Views: 1,037
    11-16-2012, 07:02 PM Go to last post
  42. Cool Binomial Distribution

    I am in dire need of some help with binomial distribution! In a given year, the probability that an adult American male dies in a car accident is...

    Started by sea1893‎, 11-16-2012 03:45 PM
    binomial distribution, standard deviation
    • Replies: 0
    • Views: 1,382
    11-16-2012, 03:45 PM Go to last post
  43. Predicting Daily Revenue

    Hello -- first posting, I would greatly appreciate your help. I work for a smallish company that is very good at tracking data, but not so good at...

    Started by Gustafswede22‎, 11-16-2012 12:17 PM
    • Replies: 0
    • Views: 1,739
    11-16-2012, 12:17 PM Go to last post
  44. Spearman correlation & Bonferroni test‏

    Hello, I would like to ask your opinion about a stat test. I have computed a Spearman correlation between 13 variables (computing two variables at a...

    Started by satranq‎, 11-16-2012 06:20 AM
    • Replies: 1
    • Views: 32,810
    11-16-2012, 09:41 AM Go to last post
  45. Question help me to identify the no of employees i should use for my research

    I am supposed to do a project on employee turnover and particular company have 500 employees and their annual turnover is 12%. I need to know no...

    Started by ange88‎, 11-15-2012 02:29 AM
    • Replies: 2
    • Views: 2,165
    11-16-2012, 04:01 AM Go to last post
  46. Parasite data - currently using generalized linear models - which test to use?

    Hi, I have a problem deciding which approach to take towards my data. I am doing a small research project in which I check if the diet of Herring...

    Started by Estefania_v‎, 11-16-2012 03:54 AM
    • Replies: 0
    • Views: 1,498
    11-16-2012, 03:54 AM Go to last post
  47. Nested Data - is mixed effects modeling appropriate here?

    Hi! I'm trying to determine the most appropriate way to analyze a data set which comes from a nested experimental design. The basic setup is...

    Started by ttirrell‎, 11-15-2012 04:55 PM
    mixed effects model, nested data
    • Replies: 4
    • Views: 1,567
    11-16-2012, 02:08 AM Go to last post
  48. Finding the time-to-failure of a lightbulb?

    How would I find the time-to-failure of a lightbulb with a z-score of 1.25? I'm not sure what formula I would use... I'm also given the mean, the...

    Started by alphaville‎, 11-15-2012 10:16 PM
    • Replies: 0
    • Views: 1,219
    11-15-2012, 10:16 PM Go to last post
  49. What to do with this data

    HI I've complied this data 2012 2011 2010 2009 2008 2007 2006 2005 1ST 10.32 10.32 10.35 10.38 10.31 10.27 10.44 10.46...

    Started by BOD‎, 11-15-2012 07:10 PM
    • Replies: 1
    • Views: 1,203
    11-15-2012, 07:21 PM Go to last post
  50. Simple clarification needed for normal distributions and z-scores

    This is definitely a really dumb question, but it'd really help me out if someone could explain this to me. What is the difference between P(0 \leq Z...

    Started by oxycontiin‎, 11-15-2012 03:30 PM
    • Replies: 3
    • Views: 1,041
    11-15-2012, 04:06 PM Go to last post
  51. Question Stupid question: deriving standard dev from mean, C.I., and sample size

    So I'm trying to get a standard deviation value for a table of statistics that includes a mean, a 95% confidence interval, and a sample size. I am...

    Started by Syriloth‎, 11-15-2012 12:31 PM
    confidenceinterval, samplesize, standarddeviation
    • Replies: 1
    • Views: 1,403
    11-15-2012, 03:23 PM Go to last post
  52. Chi-Square GOF test results appear to change with size of sample

    Hi, I have not been able to find anything related to this topic on the web or on this site. I am not even sure what words to use in the search. So,...

    Started by edstahlman‎, 11-15-2012 12:47 PM
    • Replies: 2
    • Views: 1,610
    11-15-2012, 02:31 PM Go to last post
  53. Question Using probit model

    Could anybody explain to me how to work with a model based on probit analysis? I have for example a model like this: Z=-2,067-2,324x+3,213y+1,782v...

    Started by villek‎, 11-15-2012 02:17 PM
    probability estimate, probit
    • Replies: 0
    • Views: 1,072
    11-15-2012, 02:17 PM Go to last post
  54. How To Reject Null When Unequal Samples? Should I Use Welch's, ANOVA or What?

    Hello, I am in the 7th grade, working on a science fair project. I engineered an electronically enhanced vision device, which I call "XYZ...

    Started by Wendy12‎, 11-15-2012 09:04 AM
    anova, help please, help statistics question, what test
    • Replies: 0
    • Views: 1,840
    11-15-2012, 09:04 AM Go to last post
  55. Exclamation Comparing Survey Results

    I just recently administered two surveys testing the effectiveness of a product. Each survey consisted of the same 3 questions and were answered on a...

    Started by AGregg‎, 11-14-2012 10:28 PM
    correlation, significance, statistic, t-test, z-test
    • Replies: 0
    • Views: 3,683
    11-14-2012, 10:28 PM Go to last post
  56. Cluster Sampling and Standard Errors

    I looked around to find the answer on this site but did not find any, so I apologize if this has been discusses recently and would welcome...

    Started by Onhech‎, 11-14-2012 06:09 PM
    • Replies: 0
    • Views: 1,602
    11-14-2012, 06:09 PM Go to last post
  57. Sample Size

    Can you give a simple example on how to calculate sample size? What are the central ideas to understand this? Please help

    Started by shindy‎, 11-14-2012 04:54 PM
    • Replies: 0
    • Views: 869
    11-14-2012, 04:54 PM Go to last post
  58. Redistributing Budget

    I need to redistribute our budget based on what is left for the year. I am not allow to change our total budget number. FYI our fiscal year is July...

    Started by psrs0810‎, 11-14-2012 03:24 PM
    • Replies: 0
    • Views: 1,071
    11-14-2012, 03:24 PM Go to last post
  59. Simple Logistic Regression Help


    Started by chinatonez‎, 11-14-2012 11:54 AM
    • Replies: 4
    • Views: 1,276
    11-14-2012, 03:03 PM Go to last post
  60. Smile How to prove a non negative definite matrix has to be a variance-covariance matrix?

    I know this is a iff condition,and the reverse is easy to prove.But I am having some difficulty to prove that all non negative definite matrices are...

    Started by arsene_lady‎, 11-13-2012 07:08 AM
    multivariate analysis, probability theory, statistical analysis
    • Replies: 4
    • Views: 1,669
    11-14-2012, 02:09 PM Go to last post

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