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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. Average salary paid to teachers and expenditures per pupil are two commonly used

    measures of tha amount of money spent on education. Pay:Amount of pay in thousands Spend:Average amount spent per student in thousands State ...

    Started by tomkkk‎, 01-28-2012 09:20 PM
    • Replies: 1
    • Views: 1,238
    01-28-2012, 09:36 PM Go to last post
  2. 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: 2,541
    11-25-2012, 06:09 AM Go to last post
  3. Average vs 99.9% of samples less than

    Hi I have a question that is far beyond my mathematical abilities. I work for an IT firm and I need to be able to explain the relationship...

    Started by duncanr‎, 02-26-2008 04:22 PM
    • Replies: 3
    • Views: 2,608
    02-28-2008, 02:13 AM Go to last post
  4. Averages

    hello, I am struggling with these two questions, would appreciate some help with it: 1. In a set of squares, the average length of a side is...

    Started by Yankel‎, 07-04-2013 04:16 AM
    • Replies: 0
    • Views: 1,148
    07-04-2013, 04:16 AM Go to last post
  5. Averaging Across Subjects or Trials

    Hello everyone: This is a ridiculously easy question that I'm slightly ashamed to ask but I've gotten into arguments about it with a few people...

    Started by chainhomelow‎, 02-28-2014 01:45 PM
    • Replies: 0
    • Views: 589
    02-28-2014, 01:45 PM Go to last post
  6. Averaging Averages

    Yes, I know it can be mathematically dodgy, but...I have spreadsheets of household water use data, which is given to me in AverageLiters per Day per...

    Started by heather_s‎, 06-07-2009 02:22 AM
    • Replies: 0
    • Views: 2,404
    06-07-2009, 02:22 AM Go to last post
  7. averaging data but excluding spurious figures

    Hi all Apologies in advance but I'm statistially naive. I have been collecting responses to questions in a number format and then need to collate...

    Started by salopian‎, 11-06-2014 11:43 AM
    • Replies: 2
    • Views: 1,325
    11-06-2014, 12:17 PM Go to last post
  8. Averaging Help

    I have a list of sizes and need to get an average but I have to give the larger sizes more weight. How do I do this? Thanks.

    Started by usha92‎, 03-09-2014 09:29 PM
    • Replies: 4
    • Views: 1,412
    03-10-2014, 10:11 AM Go to last post
  9. Averaging regression coefficients for 50 regression , how to report t statistic ??

    hi i have estimated same regression equation for 50 stocks, i need to report the cross sectional average of the regression coefficients, how can i...

    Started by NEWTOSTATA‎, 04-01-2013 08:38 PM
    averaging averages, cross sectional, regression coefficient, t-statistic
    • Replies: 3
    • Views: 2,871
    04-04-2013, 09:41 AM Go to last post
  10. Averge and Dispersion

    Below are listed the rates of abortion per 100,000 women for 13 US states in 1973 and 1975. Describe what happened to these distributions over the...

    Started by raheelkhosa‎, 01-23-2012 01:09 AM
    • Replies: 1
    • Views: 1,766
    01-23-2012, 01:21 AM Go to last post
  11. Awerage growth rate (3 years) - which method?

    Hello! I am intending to perform independent samples T Test, between two groups of companies in comparing average annual growth rate in years...

    Started by ynos‎, 01-21-2007 08:30 PM
    • Replies: 1
    • Views: 2,645
    01-27-2007, 06:02 PM Go to last post
  12. Axiom of regularity

    Dear people, I was wondering what the following sentence actually means: Every non-empty set A contains an element B which is disjoint from A....

    Started by Mkkl‎, 02-04-2013 10:26 AM
    • Replies: 0
    • Views: 692
    02-04-2013, 10:26 AM Go to last post
  13. Back to back stem and leaf plot

    Hi, I am trying to compare 2 distributions and I like the idea of back to back stem and leaf plot. Anybody knows of a software that might do that?...

    Started by mousme‎, 12-22-2009 10:43 AM
    • Replies: 2
    • Views: 13,824
    12-22-2009, 11:36 PM Go to last post
  14. Back transformation from Log transformation

    Hello. I have quite big size of data(N=75000) with long tail. It appear to follow Lognormal or Gamma distribution. But not significant in...

    Started by yschoi‎, 08-14-2009 06:25 AM
    • Replies: 0
    • Views: 5,876
    08-14-2009, 06:25 AM Go to last post
  15. Question Back transformation of p-values

    Hi everybody, I am currently working with some raw data which are not normally distributed (ND). I have now transformed the data with squareroot...

    Started by kimmieb‎, 06-07-2016 07:33 AM
    • Replies: 2
    • Views: 1,880
    06-08-2016, 04:18 PM Go to last post
  16. Backing out standard errors on regression betas from Least Significant Differences

    I'm trying to do a meta-regression analysis on the effect of a certain treatment on crop yields. There are tons of papers reporting effects, and I...

    Started by andrewcd‎, 02-24-2012 01:17 PM
    • Replies: 2
    • Views: 1,936
    02-24-2012, 02:09 PM Go to last post
  17. Backing up from data

    Hi all, I have results from a test done several years ago, however I don't have the dataset used, and would like to back up to it (or get a...

    Started by Avitra‎, 01-31-2013 11:40 AM
    • Replies: 0
    • Views: 891
    01-31-2013, 11:40 AM Go to last post
  18. Badly need assistancr L Regression

    Dear JohnM, It looks everything is falling on you. I badly need assistance on this issue which I am putting up for the third time. Please help out....

    Started by dave‎, 10-10-2006 10:25 AM
    • Replies: 0
    • Views: 1,758
    10-10-2006, 10:25 AM Go to last post
  19. balanced and unbalanced design

    Please kindly help me, my project topic is "A COMPARATIVE STUDY ON BALANCED AND UNBALANCED DESIGN IN EXPERIMENTAL DESIGN" i will really appreciate...

    Started by ibnquasale‎, 05-18-2011 11:14 AM
    • Replies: 4
    • Views: 5,182
    05-18-2011, 11:47 AM Go to last post
  20. Balancing Contribution to Data Set from Sources

    Hi there, I haven't touch stats in a while, and needs a hint on the mathematical term on what it is that I am actually doing so I can further...

    Started by CenTiSoN‎, 04-17-2010 12:42 AM
    • Replies: 4
    • Views: 2,508
    05-03-2010, 02:22 AM Go to last post
  21. balls of different colors

    Here is a question: A bag contains 100 balls. We randomly take 5 balls out the bag, and we find that the 5 balls have 3 different colors (e.g.,...

    Started by coyote‎, 05-01-2014 12:56 AM
    • Replies: 0
    • Views: 830
    05-01-2014, 12:56 AM Go to last post
  22. Bandwidth selection for kernel density estimation

    Hi all, I'm looking to perform a kernel density estimation on a set of 40 locations. At first I used LSCV as the bandwidth, however it seems to...

    Started by mr_bennyc‎, 01-22-2012 11:47 AM
    • Replies: 0
    • Views: 1,086
    01-22-2012, 11:47 AM Go to last post
  23. Bar charts/graphs

    HI everyone, I am using SPSS 14. I have multiple variables that contain information on the presence/absence on a number of subtypes of a symptom...

    Started by cheshirecat‎, 06-09-2009 03:47 AM
    • Replies: 0
    • Views: 2,338
    06-09-2009, 03:47 AM Go to last post
  24. Bar plot, 4 nominal and 2 scale variables

    Hi I want to create a special bar plot. I have four nominal variables, let's call them "Examination year", "Hospital", "Machine" and "Diagnosis"....

    Started by sandblov‎, 10-15-2013 03:45 AM
    • Replies: 2
    • Views: 1,617
    10-23-2013, 06:23 AM Go to last post
  25. Bartlet and KMO

    Hello everyone, I am new memeber in this site. I have a question. I would like to do exporatory factor analysys. Before doing it, it si...

    Started by katarina‎, 08-25-2015 06:01 AM
    • Replies: 3
    • Views: 1,290
    08-26-2015, 08:05 AM Go to last post
  26. baseball fun

    The Atlanta Braves have a batting avg of mew = .287 with a s = .025. One of the sports trainers asked the batters to start wearing amber colored sun...

    Started by saige30‎, 06-30-2008 11:01 PM
    • Replies: 1
    • Views: 2,296
    06-30-2008, 11:30 PM Go to last post
  27. Baseline measure IV as control ok to use in regression model?

    Hi there, I want to see if my independent variable (IV) induced over 1-week can predict my dependent variable (DV) over 1-week. I have also the...

    Started by Charlotte27‎, 01-20-2014 03:35 PM
    • Replies: 5
    • Views: 1,348
    01-21-2014, 01:24 PM Go to last post
  28. Basic - Mean or median?

    Hello all, Quite a basic question here, but just looking for other opinions. When deciding which measure of central tendency to use, I tend to...

    Started by Linguist_‎, 07-31-2011 01:08 PM
    • Replies: 8
    • Views: 3,971
    08-02-2011, 02:03 AM Go to last post
  29. Basic ANOVA question

    Hello, I'm new to statistics and want to analyse a simple data set. I want to show that the expression level of a gene changes by increasing the...

    Started by iced_eax‎, 07-24-2010 08:45 AM
    • Replies: 3
    • Views: 2,858
    07-24-2010, 11:41 AM Go to last post
  30. basic ANOVA questions

    I do not have a strong background in stats, and am having a hard time figuring out which is the right way to test for significant differences. I...

    Started by smit3695‎, 07-21-2010 03:50 PM
    • Replies: 1
    • Views: 4,589
    07-21-2010, 10:09 PM Go to last post
  31. Basic averages question

    I am trying to work out the total average from a set of 5 averages. See below: Class 1: Total number of weeks = 12 Total number of hours =...

    Started by GF23‎, 05-07-2015 07:29 AM
    • Replies: 2
    • Views: 1,376
    05-08-2015, 03:01 AM Go to last post
  32. Basic biostats ques.

    I've got a few questions to ask for help since I'm new to this topic and kinda loathes it, it's so confusing! Maybe it's because it's too logical,i'm...

    Started by schahiidah‎, 05-25-2012 08:11 AM
    • Replies: 1
    • Views: 1,748
    05-25-2012, 12:23 PM Go to last post
  33. Basic concept: degrees of freedom

    Can someone please explain what this really means? Also, what does adjusting the R-squared for degrees of freedom mean? Thanks.

    Started by StatsClue‎, 01-04-2012 09:05 PM
    • Replies: 2
    • Views: 2,578
    01-04-2012, 09:42 PM Go to last post
  34. Basic correlation question

    Hello there, I've been asked to look at some data in SPSS for work. I don't normally do anything very complex, I'm more of an IT person so I would...

    Started by mm8995‎, 07-17-2007 10:03 AM
    • Replies: 3
    • Views: 2,534
    07-19-2007, 01:19 AM Go to last post
  35. Unhappy Basic count analysis Help! Please!

    Hi, I'm trying to analyse some basic count data - analyse/portray differences the data in five categories, of which 3 have n=10 and 2 have...

    Started by tmc98‎, 09-22-2014 04:08 PM
    • Replies: 1
    • Views: 1,380
    09-24-2014, 06:55 AM Go to last post
  36. Basic Expectation

    hi guys, this problem looks simple but tricky. give it a try. Q. Suppose X1 and X2 are real-valued random variables with f as their common...

    Started by RoX@r‎, 05-28-2012 11:29 AM
    • Replies: 7
    • Views: 2,228
    05-28-2012, 01:20 PM Go to last post
  37. Unhappy basic help needed for Chi-square

    Hello all, I feel embarassed even having to ask this, but I'm not much of a numbers person, and I've worked myself into a corner. I would...

    Started by MathIdiot‎, 01-29-2011 04:08 PM
    • Replies: 4
    • Views: 4,148
    01-30-2011, 02:08 PM Go to last post
  38. Basic high school correlation coefficient help

    Question + info: http://i.imgur.com/iyBWi2i.png In question 3, the correlation coefficient I get is the exact same as in question 2... Therefore...

    Started by touran‎, 02-04-2017 05:36 AM
    coefficient, correlation, log
    • Replies: 0
    • Views: 1,114
    02-04-2017, 05:36 AM Go to last post
  39. Basic Index Question...help please

    Hi, The answer to the following question is $1400. Is this answer a mistake? I can't seem to get it! Thank you kindly for your help! --Peter ...

    Started by pcampin‎, 12-11-2011 03:58 PM
    • Replies: 1
    • Views: 1,263
    12-11-2011, 04:16 PM Go to last post
  40. Basic IV/DV help

    I'm from a social science background, so I thought that my current research study was going to be more straightforward, but I can't seem to even get...

    Started by Linguist_‎, 11-10-2011 11:55 AM
    • Replies: 0
    • Views: 1,616
    11-10-2011, 11:55 AM Go to last post
  41. Basic Lottery Question

    In Lotto 6-53, there is a box with 53 balls, numbered 1 to 53. Six balls are drawn at random without replacement from the box. You win the grand...

    Started by requiems‎, 02-27-2009 11:47 AM
    • Replies: 1
    • Views: 5,400
    02-27-2009, 02:15 PM Go to last post
  42. Basic marginal distribution question.

    So given the joint probability density function fXY(x,y) = 1/2 * x*y with x ranging from 0 to 2 and y from 0 to x find FY|X(y|x) I understand the...

    Started by tmcarthur123‎, 11-19-2013 10:17 AM
    • Replies: 0
    • Views: 902
    11-19-2013, 10:17 AM Go to last post
  43. Basic Measurement Error when calculating the Mean

    Hi all, I have a question about measurement error and how it can play a role when calulating the error of the mean. I have an automated process...

    Started by cp51‎, 12-16-2014 12:01 PM
    • Replies: 6
    • Views: 1,834
    12-19-2014, 12:12 PM Go to last post
  44. Basic Normal linear Combination problem

    I sold my stat textbook and I'm punching myself in the face for forgetting some of the basics. If you have three independent variables, X1, X2...

    Started by whittle041‎, 01-28-2012 12:24 AM
    • Replies: 1
    • Views: 1,534
    01-28-2012, 12:44 AM Go to last post
  45. 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
  46. Basic probability help

    Mechanical Engineering reported on the need for wireless networks to monitor the quality of industrial equipment. For example, consider Eaton Corp.,...

    Started by beccaspends‎, 02-26-2017 06:01 PM
    probability, statistics
    • Replies: 2
    • Views: 1,649
    02-26-2017, 08:02 PM Go to last post
  47. Basic Probability Question

    You estimate the probability that she will answer this question correctly to be 0.8. You estimate the probability you will answer this question...

    Started by the_chemist‎, 01-13-2011 04:22 PM
    • Replies: 2
    • Views: 3,251
    01-13-2011, 06:37 PM Go to last post
  48. Basic question

    Hi When I have a dataset {x} consisting of N measurements, and I find the standard deviation by the standard expression sigma^2 = (1/N) * sum {...

    Started by Niles‎, 09-12-2011 01:52 PM
    • Replies: 7
    • Views: 2,072
    09-14-2011, 11:48 AM Go to last post
  49. basic question

    Dear all, I am studying the 3 approaches (A, B and C) 47 Spanish public universities from the 17 Spanish states (somes states have more than one...

    Started by paulalee‎, 10-11-2011 03:56 PM
    • Replies: 2
    • Views: 1,809
    10-12-2011, 05:33 AM Go to last post
  50. Basic question

    Suppose my null hypothesis is “Not more than 50% person prefer milk” and alternate hypothesis is “More than 50% (or majority) prefer milk”. Actually...

    Started by RCS‎, 01-18-2015 02:08 AM
    binomial test, hypothesis test, survey analysis
    • Replies: 1
    • Views: 1,407
    01-18-2015, 07:49 AM Go to last post
  51. Basic question

    Suppose you had a pile of 120 million red and blue jelly beans where 20 out of every 100,000 of them were red jelly beans. And suppose you moved ten...

    Started by Alpine‎, 07-22-2015 11:12 PM
    • Replies: 2
    • Views: 1,112
    07-23-2015, 08:49 PM Go to last post
  52. Basic question about correlation

    I'm trying to build an econometric model and have a basic question: Suppose corr(X,Y)=0.5 and corr(X,Z)=0.5, where X, Y, and Z are RVs. Is the...

    Started by EastCoastDoctoral‎, 11-30-2006 09:19 AM
    • Replies: 1
    • Views: 1,929
    12-04-2006, 01:08 AM Go to last post
  53. Basic question about correlation calculations

    hi all, i need an urgent help about correlation calculations. assume that, i have two time series data sets, Each contains 100 days (numbers),...

    Started by cem babaeren‎, 05-30-2012 12:30 AM
    correlation
    • Replies: 1
    • Views: 1,481
    06-04-2012, 12:34 AM Go to last post
  54. basic question about normality and equal variance

    Ok so I have a dataset with normal residuals, but unequal variance. I still ended up with unequal variance after transformations. Do I have to use a...

    Started by frugi‎, 02-20-2010 05:03 PM
    • Replies: 4
    • Views: 3,628
    02-20-2010, 11:16 PM Go to last post
  55. Basic question about variance

    Hi! First time poster, hello all! My question is as follows: a symmetrical dice is tossed ten times. What is the expected value and variance? ...

    Started by Leso‎, 06-06-2013 02:29 AM
    • Replies: 4
    • Views: 1,643
    06-06-2013, 08:21 AM Go to last post
  56. Basic Question about Weight Average

    This is a pretty simple question and I'm wondering how to go about finding a solution. I have the following data. ttt =...

    Started by amathew‎, 05-08-2013 10:20 AM
    • Replies: 0
    • Views: 881
    05-08-2013, 10:20 AM Go to last post
  57. Basic question on dealing with nominal IVs

    Hi all Let's imagine we have 3 columns: Country (with 30 levels, but entirely nominal), GDP (continuous) and voter turnout (continuous) How...

    Started by drewmac‎, 03-10-2016 02:25 PM
    • Replies: 3
    • Views: 1,888
    03-11-2016, 06:16 AM Go to last post
  58. Basic question regarding Logistic regression using census data

    Instead of using sampled data, if I use census data to perform Logistic regression, what is the meaning of z-value? Are all coefficients valid...

    Started by yamamoto‎, 08-19-2013 09:35 AM
    • Replies: 1
    • Views: 1,355
    08-19-2013, 09:48 AM Go to last post
  59. Basic question regarding methods

    Anyone: 1. How many different statistical methods/tests are there? Hundreds? thousands? (ANOVA, chi-square, etc.) 2. Why are there so many...

    Started by Suzy‎, 03-15-2006 08:39 PM
    • Replies: 3
    • Views: 1,921
    03-18-2006, 05:28 PM Go to last post
  60. Basic question...how to calculate minimum sample size with complete population data

    Hello, out-of-practice stats guy here. A business question I have is what is the minimum sample size I need to accurately measure revenue per...

    Started by Wolfram‎, 01-23-2015 12:05 PM
    • Replies: 1
    • Views: 1,602
    01-28-2015, 03:09 PM Go to last post

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