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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: 197,089
    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: 66,920
    09-30-2005, 09:44 AM Go to last post
  1. Nonparametric test choice for skewed data

    Hello, My first thread on the board... I posted this to the SPSS-X list , but thought this forum may be more appropriate. I was wondering if...

    Started by n_knight‎, 03-05-2006 04:42 AM
    • Replies: 8
    • Views: 9,832
    01-12-2007, 04:05 PM Go to last post
  2. Skewness of a sum of independent lognormal variables?

    Hey, I have a set of lognormally distributed independent variables X1,...,Xn each with different E and Var for k=1,2...n. (So each Xk has its own...

    Started by TheNewbie‎, 11-12-2010 08:04 AM
    • Replies: 7
    • Views: 9,826
    11-12-2010, 07:10 PM Go to last post
  3. Question regarding finding midpoints, relative frequency and cumulative frequency

    I was given a list of numbers as listed below: 91 472 279 249 530 376 188 341 266

    Started by BROOKIREDD‎, 04-02-2011 09:48 AM
    • Replies: 8
    • Views: 9,826
    04-02-2011, 01:58 PM Go to last post
  4. Interpreting the results of Kruskal-Wallis QUESTION

    If I have used Kruskal-Wallis to compare 3 data sets of diameter values for 3 different populations of trees, and the results are significant...

    Started by utahensis‎, 02-04-2012 05:26 PM
    interpreting results, kruskal-wallis
    • Replies: 4
    • Views: 9,822
    02-04-2012, 07:41 PM Go to last post
  5. Interquartile range: Why add 1 to the sample size

    My understanding is that the interquartile range is calculated by taking the difference between the (N+1)*0.75th observation and the (N+1)*0.25th...

    Started by FluffyStats‎, 10-30-2010 02:37 PM
    • Replies: 1
    • Views: 9,816
    10-30-2010, 02:52 PM Go to last post
  6. sample means and probability

    Seventy million pounds of trout are grown in the U.S. every year. Farm-raised trout contain an average of 32 grams of fat per pound, with a standard...

    Started by melshine‎, 03-25-2008 04:07 PM
    • Replies: 1
    • Views: 9,813
    03-25-2008, 07:25 PM Go to last post
  7. What are reverse confidence intervals?

    Can someone just give me a brief overview of how these differ from regular confidence intervals? I can't find anything on google. Never heard of...

    Started by c2q‎, 04-06-2011 04:02 PM
    • Replies: 6
    • Views: 9,813
    04-08-2011, 03:00 PM Go to last post
  8. Deck of cards and probability (non replacement)

    Hi can someone help me Im stuck. When selecting cards from a deck without replacement: What is the probability that the first card is a four and...

    Started by keithb‎, 03-07-2009 02:21 PM
    • Replies: 8
    • Views: 9,810
    11-11-2010, 09:40 PM Go to last post
  9. Help Regarding Standard Deviation in SPSS

    Hi, I am working on a HR Project. This is my situation: 14 Questions, all are objective type, they have five options: 1=Strongly disagree,...

    Started by vipinkr3‎, 05-15-2011 09:42 AM
    • Replies: 3
    • Views: 9,807
    05-16-2011, 12:44 AM Go to last post
  10. Relatively easy hw problem

    The problem seems relatively easy. No big formula is required (i think?) Well, this is the question A newspaper article about the results of a...

    Started by sony_v‎, 11-17-2010 02:42 AM
    • Replies: 2
    • Views: 9,801
    11-17-2010, 04:05 AM Go to last post
  11. confused..Kruskal-Wallis!,mutipe Mann-Whitney!,ANOVA!

    Hi everyone I’m doing a research on three different diseases I’m measuring a protein in theses diseases using an ordinal score The scores are...

    Started by ONSO‎, 12-05-2009 09:52 AM
    • Replies: 7
    • Views: 9,792
    12-06-2009, 09:21 AM Go to last post
  12. The other formula for SD

    We all know the formula for SD But I recall a pal of mine long long ago showing me another formula for working out SD that - he argued - was far...

    Started by Philyuko‎, 01-13-2009 09:00 AM
    • Replies: 7
    • Views: 9,766
    01-01-2013, 03:36 PM Go to last post
  13. Contrasts in R for two-way and three-way interactions

    I am new to using R and have just performed some mixed effect models which have significant 2-way and 3-way interactions. My question is now that I...

    Started by jmike‎, 07-11-2011 04:32 PM
    contrasts, mixed effect, r-project
    • Replies: 8
    • Views: 9,765
    07-14-2011, 07:31 AM Go to last post
  14. Expected Value of normally distributed random variables

    Given two independent random variables Y and W. Where Y is distributed as N(0,1) and W is distributed as N(0.100). a) Show that E = 1 and E = 0...

    Started by alias‎, 10-30-2011 12:01 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 9,743
    11-03-2011, 08:06 PM Go to last post
  15. Standard Error for Percent Change

    Would greatly appreciate some assistance calculating the standard error for a percent change, so that I can construct 95% confidence intervals and...

    Started by ts0707‎, 07-03-2008 02:43 PM
    • Replies: 0
    • Views: 9,742
    07-03-2008, 02:43 PM Go to last post
  16. Practical regression issue - correlated regressors

    Hi guys, I have a business problem where I'm trying to run a linear multivariate regression model to predict a profit variable with some internal...

    Started by statguy_33‎, 05-11-2010 05:15 AM
    • Replies: 2
    • Views: 9,730
    05-11-2010, 06:53 PM Go to last post
  17. nonparametric test percentages?

    I have a data set that doesn't fulfil the assumptions of normal distribution and equal variances. SInce it's percentage values, the recommended...

    Started by saraelf‎, 06-24-2010 02:11 PM
    • Replies: 8
    • Views: 9,722
    06-28-2010, 05:01 PM Go to last post
  18. Matched Pair vs non-pooled t test

    I'm a little bit confused as to when we would do a matched pair test and when we do a non-pooled t-test? I know that in order for us to do a matched...

    Started by Pineapple‎, 04-28-2008 02:01 AM
    • Replies: 1
    • Views: 9,719
    04-30-2008, 06:57 PM Go to last post
  19. Question about beta coefficient and p value

    Hi, I conducted univariable linear regression. One of the variables has resulted in a zero beta coefficient and the significance is <0.02. How...

    Started by devi‎, 06-20-2009 06:06 PM
    • Replies: 3
    • Views: 9,718
    06-22-2009, 06:09 PM Go to last post
  20. Help Please...

    I have my book which is sort of like Greek to me, but I have read the chapter several times, and tried to work some of the problems, but the examples...

    Started by Esadler38chick‎, 11-17-2005 07:49 PM
    2 Pages
    1 2
    • Replies: 26
    • Views: 9,707
    05-19-2008, 11:23 PM Go to last post
  21. Expected Value of X

    I'm asked to find the excpected value of x-bar, but I'm not sure what method to use here. The information I have: According to AAA, the average cost...

    Started by 402_Bill‎, 11-21-2006 08:47 PM
    • Replies: 1
    • Views: 9,707
    11-22-2006, 11:27 AM Go to last post
  22. mean signed and unsigned (absolute) error

    Hi, I'm trying to compare several computational chemistry methods with an experimental method, and some of the statistics of choice are the mean...

    Started by heathdwatts‎, 06-03-2010 11:38 AM
    • Replies: 0
    • Views: 9,690
    06-03-2010, 11:38 AM Go to last post
  23. Confidence interval ratio of variances

    Hi guys..I simply don't know where to start and my book isn't helpful at all (it doesn't mention this)....please help! A study was undertaken to...

    Started by blackjesus13‎, 10-29-2008 06:25 PM
    • Replies: 12
    • Views: 9,681
    10-30-2008, 01:25 PM Go to last post
  24. Statistics - Comparing Dose Response Curves

    So I've got a stats question for anyone who can help; "You are testing the effects of a new drug that has been synthesized as an example of a...

    Started by PBnJams‎, 10-23-2012 02:21 AM
    • Replies: 4
    • Views: 9,680
    10-25-2012, 05:31 AM Go to last post
  25. Interpretation of a oneway random-effects Intraclass Correlation Coefficient (ICC)

    I'm working with the following setup: I have two different judges rating suitability on a Likert-type rating scale for n subjects. The judges are not...

    Started by Metaphor‎, 10-28-2008 01:01 AM
    • Replies: 2
    • Views: 9,676
    10-28-2008, 07:35 PM Go to last post
  26. sampling distribution

    i have been trying to do this for while, but couldnt figure out how. AUTO ACCIDENTS A study of rush hour traffic in San Francisco counts the...

    Started by annabananaa‎, 01-13-2007 07:54 PM
    • Replies: 3
    • Views: 9,673
    01-17-2007, 05:48 PM Go to last post
  27. Question Computation of Mean/Average Z-Scores

    Hello, EDIT: I am having trouble uploading my .xls file. I also tried putting the .xls into a .zip but I will always receive an error message. How...

    Started by sectas‎, 08-30-2011 05:22 PM
    z-score, zscore
    • Replies: 1
    • Views: 9,664
    08-30-2011, 05:42 PM Go to last post
  28. Levene's Test for Equality of Variances

    Hello everyone, Would you please help me in the computation of F-ratio in Levene's Test for Equality of Variances for two groups,i.e. in t-test? I...

    Started by Azin‎, 08-01-2011 05:21 PM
    • Replies: 1
    • Views: 9,657
    08-01-2011, 06:01 PM Go to last post
  29. Using SPSS to calculate P value? How to do it?

    I'm using the SPSS software, and I have been given two columns of data e.g. one column for weight and the other for height how would I go about...

    Started by romeor2k‎, 04-09-2013 05:37 AM
    • Replies: 1
    • Views: 9,656
    04-09-2013, 09:54 AM Go to last post
  30. Question Help me out: Computing SE CV SED LSD

    Dear All, In calculating standard error of mean (SE) and coefficient of variation (CV) for summary table of means exported to excel from SAS anova...

    Started by analyst‎, 09-13-2006 08:19 AM
    • Replies: 0
    • Views: 9,639
    09-13-2006, 08:19 AM Go to last post
  31. Statistics with R - absolute beginner

    Could any recommend where to start with learning R. Which websites/books/videos explain R in the simplest possible manner?

    Started by Layo909‎, 05-28-2011 03:13 AM
    3 Pages
    1 2 3
    • Replies: 35
    • Views: 9,622
    09-20-2011, 10:40 AM Go to last post
  32. Statistic problem consiting of Student t-test problem

    Hi, I'm stuck on a question and was wondering if you guys could help me. This is the problem I have a question about: This question continues on...

    Started by Emawk‎, 03-04-2006 09:55 PM
    • Replies: 12
    • Views: 9,618
    03-08-2006, 08:04 PM Go to last post
  33. tukey or scheffe in post hoc after ANOVA

    hi, i have question on one way ANOVA. in my lecture notes it was stated only tukey . but is it ok also When the three groups are not of equal...

    Started by nurul‎, 10-13-2010 09:44 AM
    • Replies: 2
    • Views: 9,606
    10-13-2010, 10:27 AM Go to last post
  34. Question Expectation of reciprocal of a Normal Distribution

    Let X~N(a,b) How can I calculate E(1/X) ?

    Started by mirkamali‎, 09-08-2009 04:36 PM
    • Replies: 5
    • Views: 9,599
    09-09-2009, 12:03 AM Go to last post
  35. Could someone please check my answer.

    High school students who take the SAT mathematics exam a second time generally score higher than on their first try. The change in score has a...

    Started by Jerryberry‎, 01-04-2006 01:37 AM
    • Replies: 1
    • Views: 9,584
    01-04-2006, 07:53 AM Go to last post
  36. Lightning Strikes statistics question

    I can't figure out this problem The number of lightning strikes on a square kilometer of open ground in a year has a mean of 6 and a standard...

    Started by farshyfaroo‎, 03-30-2009 02:46 AM
    • Replies: 5
    • Views: 9,582
    03-30-2009, 12:54 PM Go to last post
  37. variance of log(s^2)

    Y1,...,Yn are i.i.d. random variables from N(mu, sigma^2) distribution. s^2 = sum/(n-1) , where i = 1,...,n Find var(log(s^2)) My approach:...

    Started by zzzc‎, 11-17-2010 12:57 PM
    • Replies: 2
    • Views: 9,579
    12-01-2010, 11:18 AM Go to last post
  38. S.O.S. - effect size indexes for nonparametric tests

    Hi there folks, I am carrying out a study (repeated measures design) employing nonparametric statistics ( Friedman's and Wilcoxin signed rank...

    Started by ladylaura‎, 12-12-2006 08:28 AM
    • Replies: 1
    • Views: 9,574
    12-19-2006, 07:23 AM Go to last post
  39. Showing Beta Distribution is from Exponential family

    I've been trying to show that the beta distribution is from the exponential family. So far i have: f(y│μ,φ)=Γ(φ)/Γ(μφ)Γ((1-μ)φ) y^(μφ-1)...

    Started by ctam000‎, 08-18-2010 08:03 AM
    • Replies: 2
    • Views: 9,564
    06-22-2011, 08:50 AM Go to last post
  40. P-value when one data set has all zero values

    Hi Forum :) I am currently comparing data sets of insects caught in pitfall traps from two sites with Mann-Whitney tests. There are 20 samples in...

    Started by Entomologist‎, 11-10-2011 10:14 AM
    2 Pages
    1 2
    • Replies: 20
    • Views: 9,561
    11-15-2011, 11:37 PM Go to last post
  41. One-tailed Mann Whitney U test

    Hi Everyone I am attempting to analyze data that I have collected in the field for my senior thesis. I have been advised to use a Mann Whitney U...

    Started by sws22‎, 11-15-2011 11:32 PM
    • Replies: 2
    • Views: 9,557
    11-17-2011, 05:38 PM Go to last post
  42. Tukey results

    I was wondering if anyone could provide any assistance in showing me how to report Tukey HSD test results in a table, e.g., what test statistic to...

    Started by Leyritz‎, 03-26-2006 11:45 AM
    • Replies: 1
    • Views: 9,556
    03-27-2006, 11:52 AM Go to last post
  43. Critical values for cointegration test?

    Does anybody know where I can find critical values for the cointegration test? I need to know the critical values corresponding to how many...

    Started by Akavall‎, 08-17-2007 02:21 PM
    • Replies: 2
    • Views: 9,551
    08-18-2007, 10:17 AM Go to last post
  44. Stratified Samples ???

    Hi, I'm having some trouble with this question. The question asks Stratified samples are widely used to study large areas of forest. Based...

    Started by jena2007‎, 09-11-2006 11:11 PM
    • Replies: 4
    • Views: 9,542
    09-17-2006, 07:45 PM Go to last post
  45. Mann Whitney U - P Value of 0.0000

    Good Afternoon all, I am using a Mann Whitney U to compare two populations the data ranges from (-2 to 2). I have already done this on 4...

    Started by n1477‎, 05-09-2013 07:52 AM
    mann-whitney test, mann-whitney u, p value
    • Replies: 9
    • Views: 9,539
    05-11-2013, 02:33 PM Go to last post
  46. Mann-Whitney U Test or One-way ANOVA - Welch F test?

    I have two groups (Site 1 and Site 2) and would like to look at differences between the sites. The data violates assumptions of homogeneity of...

    Started by klm‎, 11-14-2011 09:58 AM
    • Replies: 6
    • Views: 9,534
    11-18-2011, 03:35 AM Go to last post
  47. Expected Value of AB

    Let A=f(x)=(3/8)x^2 where 0<=x<=2 B=g(x)=(1/4)x^3 where 0<=x<=2 I need to find Cov(A,B), I know Cov(A,B) = E-EE, but how to calculate E??

    Started by howfly24‎, 05-15-2011 04:24 AM
    • Replies: 4
    • Views: 9,532
    05-18-2011, 01:31 PM Go to last post
  48. Unhappy Doubt on partial correlation SPSS output

    Hello there, I'd need some help interpreting the output of a partial correlation analysis. The background is quite simple: I have two group of...

    Started by lndtrp‎, 01-24-2011 10:23 PM
    controlling variable, partial correlation
    • Replies: 7
    • Views: 9,528
    01-27-2011, 10:31 AM Go to last post
  49. Controlled Variable, replication, and randomization

    Hi all, I'm stuck on this homework question dealing with the topics mentioned in the title of this thread. The quality control department of a...

    Started by raphytaffy‎, 09-17-2010 11:58 AM
    • Replies: 0
    • Views: 9,508
    09-17-2010, 11:58 AM Go to last post
  50. Pearson correlation coefficient P-value statistic?

    Original question: How was the P-value for the Pearson correlation coefficient calculated? What is the number of degrees of freedom of the test...

    Started by alexgoh‎, 12-19-2010 01:50 PM
    • Replies: 1
    • Views: 9,503
    12-19-2010, 01:55 PM Go to last post
  51. Chi square test, expected frequency less than 5

    Please someone help me out. I have three independent group data (Group A, B, and C), which sample size is 128, 100, and 31. Among those, the...

    Started by sammy0131‎, 07-03-2010 03:40 PM
    • Replies: 5
    • Views: 9,501
    07-06-2010, 10:52 AM Go to last post
  52. How to find level of confidence?

    Say I have upper bound and lower bound of a confidence interval and I know standard deviation too.how can I deduct level of confidence from this...

    Started by SadieKhan‎, 10-05-2010 10:51 PM
    • Replies: 2
    • Views: 9,463
    10-06-2010, 03:51 AM Go to last post
  53. finding p-value when F-value and df's are known

    Websites like this: http://www.danielsoper.com/statcalc/calc07.aspx gives you exact p-value when u enter F-value, and df's. Is there any way we can...

    Started by hanelliot‎, 02-24-2010 12:46 AM
    • Replies: 3
    • Views: 9,459
    02-24-2010, 05:30 AM Go to last post
  54. Significance (t-statistic)

    I'm not sure how to answer this one: Q: You are testing Ho: mu = 0 against Ha: mu (does not equal) 0 based on an SRS of 20 observations from a...

    Started by mackerbuddy‎, 12-04-2005 03:29 AM
    • Replies: 3
    • Views: 9,451
    12-04-2005, 10:22 PM Go to last post
  55. t test in excel

    HI there, I am trying to compare the means from 2 independant groups in excel. I am using excel 2003 and dont have any of the data anaylsis add...

    Started by vanessa‎, 11-23-2008 10:37 PM
    • Replies: 2
    • Views: 9,447
    11-26-2008, 03:14 PM Go to last post
  56. Teaching yourself statistics

    I couldn't find a similar topic in Search so I'd appreciate any feedback you can share. I want to teach myself statistics and probability. I...

    Started by Kovacs‎, 04-24-2010 02:20 PM
    • Replies: 6
    • Views: 9,426
    05-04-2010, 02:06 AM Go to last post
  57. Calculating Confidence Intervals for survey results

    Hello I have what is probably a fairly basic question! I am conducting a number of surveys looking at expenditure behaviour of audiences at an...

    Started by timberland20‎, 03-04-2010 08:35 AM
    • Replies: 2
    • Views: 9,424
    03-23-2010, 01:11 AM Go to last post
  58. How to find the 70th percentile and Q3

    Ok so lets say that N(4,3) how would I find the 70th percentile and Q3. I know that the values would be something like (-5, -2, 1,4,7,10,13) based on...

    Started by nati1459‎, 11-23-2011 07:12 PM
    • Replies: 4
    • Views: 9,421
    11-25-2011, 01:32 AM Go to last post
  59. Finding a least squares fit for f(x)=A*cos(Bx)

    Hello, I'm trying to derive the solutions for the estimates of A and B for the equation f(x)=A*cos(Bx) or ...cos(Bx+C) using least squares. I have...

    Started by leaf man‎, 07-03-2008 07:45 PM
    • Replies: 5
    • Views: 9,399
    07-06-2008, 11:37 PM Go to last post
  60. Should i use ancova or anova? One continuous variable and one categorical variable.

    I have one dependent variable that is continuous. It is the score on a particular achievement test. I have two independent variables. One categorical...

    Started by kelvarnsen‎, 03-26-2013 10:19 AM
    ancova, anova
    • Replies: 13
    • Views: 9,399
    03-27-2013, 09:29 AM Go to last post

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