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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: 200,368
    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: 68,582
    09-30-2005, 09:44 AM Go to last post
  1. How do you find a P-Value from a T-Test?

    Hi, I'm a student at Virginia Tech taking Biostat. With a T-Test, how do I find the P-Value using a t-table (df) and a z-table (z)? I have an...

    Started by CTrozado‎, 05-01-2008 09:07 PM
    • Replies: 5
    • Views: 777,175
    10-18-2009, 12:01 PM Go to last post
  2. What F value stands for in ANOVA analysis?

    Hi everyone, When I do ANOVA test, I notice in the output many values among them P, F values. Could somebody please tell me what F value in...

    Started by statser‎, 03-02-2009 05:08 AM
    • Replies: 11
    • Views: 317,671
    05-27-2015, 08:09 AM Go to last post
  3. Using Z table confusion

    Hello, Can someone please tell me when to use z cumulative table or when to use z table value starts from 0 or when do you use 1-z value. I am...

    Started by radhesave123‎, 10-22-2008 09:05 AM
    • Replies: 3
    • Views: 287,880
    10-22-2008, 10:56 AM Go to last post
  4. Exclamation How to calculate P-value?

    Hi, i have searched on talkstat and on internet as well but I could find the method of calculating a p-value by hand, all I am getting is p-value...

    Started by SadieKhan‎, 11-12-2010 12:34 PM
    • Replies: 4
    • Views: 258,083
    11-12-2010, 02:53 PM Go to last post
  5. Question What does the forumla Σ(x-xbar)/((n-1)v^(3/2)) calculate?

    What does the following formula calculate? Thanks

    Started by tuna‎, 11-14-2009 10:24 AM
    • Replies: 11
    • Views: 244,750
    11-15-2009, 03:25 PM Go to last post
  6. And help with this one too….

    Suppose the yearly rainfall totals for a city in northern California follow a normal distribution with a mean of 18 inches and standard deviation of...

    Started by jhutchings‎, 09-07-2011 10:30 AM
    • Replies: 1
    • Views: 217,933
    09-07-2011, 10:42 AM Go to last post
  7. Use a t-test to test the claim about the population mean µ at the given level of ...

    Use a t-test to test the claim about the population mean µ at the given level of significance significance a using the given sample statistics. ...

    Started by BROOKIREDD‎, 04-19-2011 07:55 PM
    • Replies: 2
    • Views: 201,141
    04-19-2011, 10:03 PM Go to last post
  8. Difference between standard deviation and standard error

    Hi, what exactly is the difference between the SD and SE? I read through the wikipedia article but dont really understand the difference. Can...

    Started by beginner‎, 11-30-2009 05:14 AM
    confidence interval, standard deviation, standard error
    • Replies: 8
    • Views: 178,477
    09-03-2014, 11:48 AM Go to last post
  9. Quick questions…

    1. can count data (integers) be used in linear regression?* 2. Can the mean value of many sample of integers be classed as a continuous variable?...

    Started by Layo909‎, 12-04-2011 08:16 AM
    • Replies: 6
    • Views: 174,645
    12-05-2011, 04:35 AM Go to last post
  10. Class width

    I am doing a self-learning class in Statistics and in my book, which I've just started, it shows a definition for class width as the following: ...

    Started by frailjar7‎, 05-12-2008 11:56 AM
    • Replies: 2
    • Views: 151,411
    05-12-2008, 10:32 PM Go to last post
  11. likelihood function for random effects mode‏l

    Can someone give hints on how to formulate a likelihood function for random effects model? y_ij=mu_i+b_j+e_ij, where i=1, 2 are the mean before and...

    Started by hehe1223‎, 04-03-2011 08:30 PM
    • Replies: 2
    • Views: 147,383
    04-03-2011, 08:40 PM Go to last post
  12. Unhappy Help! How to interpret t-tests/t values?

    Hello, I'm a journalist researching a story for a mental health publication. A number of studies I'm looking at give their results in terms of "t...

    Started by KristieR‎, 10-22-2008 12:52 PM
    • Replies: 11
    • Views: 136,154
    10-31-2008, 09:28 AM Go to last post
  13. Why is Z0.05 = 1.645?

    I'm using a standard normal table from back of my text, and I can't find 1.645 anywhere. If anything, shouldn't it be 0.4801? What am I missing?...

    Started by hanelliot‎, 04-25-2009 11:56 AM
    • Replies: 2
    • Views: 132,157
    04-25-2009, 02:09 PM Go to last post
  14. Quartiles in a normal Distribution

    how would one find quartiles in a normal distrubtion? im just confused as to what im supposed to look for i know the mean/median/q2 in this case...

    Started by dee‎, 10-02-2005 10:07 PM
    • Replies: 5
    • Views: 126,900
    08-12-2013, 04:39 AM Go to last post
  15. Adjusted R squared interpretation

    I've always had the adjusted R squared interpretation explained to me in the following way (quoted from wikipedia) Adjusted R2 is a modification...

    Started by nathanwands‎, 07-03-2009 11:59 AM
    • Replies: 1
    • Views: 119,286
    07-03-2009, 12:51 PM Go to last post
  16. Calculating Probability from the Mean, and Standard Deviation

    If anyone may be able to give me a little insight into how I would go about answering this question I would greatly appreciate it. This is the...

    Started by aunistudent‎, 11-07-2009 01:40 PM
    • Replies: 8
    • Views: 116,164
    11-08-2009, 04:30 PM Go to last post
  17. Kaplan–Meier plot: What statistical tests to perform?

    Hi, I am working on a class project and wanted some suggestions on what statistical tests would be appropriate for analyzing the data that was...

    Started by stealthcobalt‎, 05-01-2011 07:20 PM
    • Replies: 1
    • Views: 109,924
    05-01-2011, 09:55 PM Go to last post
  18. Welch–Satterthwaite equation: proof or derivation?

    Hi, I'm studying now the Welch's t-test in which we use the Welch–Satterthwaite equation to calculate the degrees of freedom of the approxiamate...

    Started by advmc‎, 07-17-2010 02:52 PM
    • Replies: 3
    • Views: 109,913
    07-18-2010, 01:19 PM Go to last post
  19. standard deviation of multiple sample sets

    I'm trying to determine the standard deviation of multiple sample sets (measurements A, B, C taken on 3 different days), for which I know the means...

    Started by shoes‎, 02-07-2009 09:55 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 101,552
    09-07-2014, 01:28 AM Go to last post
  20. Question Why degrees of freedom=0 for Hosmer–Lemeshow test?

    As part of some research for my dissertation I ran a multiple logistic regression. I was left with a regression model with only one predictor...

    Started by Clairept‎, 07-28-2012 11:02 AM
    • Replies: 7
    • Views: 100,942
    07-28-2012, 07:57 PM Go to last post
  21. Standard error v standard deviation

    What is the difference between Standard error v standard deviation, please? Thank you

    Started by qim‎, 12-07-2008 12:35 PM
    • Replies: 5
    • Views: 100,749
    06-12-2011, 03:35 PM Go to last post
  22. conducting a two-sided test at the α= 0.05 level of significance

    Hey guys i assume this is probably a really basic question, but its giving me trouble. I have only recently taken up stat study and have a limited...

    Started by Reels‎, 05-24-2010 12:11 AM
    • Replies: 5
    • Views: 99,257
    05-24-2010, 01:17 AM Go to last post
  23. absolute versus relative frequencies in χ2 testing

    Dear forum members, I am looking at two different sequences of events (s1, s2) of different length (l1, l2). Each event in the sequence can be of...

    Started by voronoi‎, 12-17-2009 01:35 AM
    • Replies: 0
    • Views: 98,999
    12-17-2009, 01:35 AM Go to last post
  24. Someone puts Cohen's d in a nutshell, please

    Hi, I came across Cohen's d statistic and I would very appreciate if anyone could provide me with a brief explanation of it and with an example...

    Started by gianmarco‎, 09-02-2010 10:26 AM
    • Replies: 7
    • Views: 98,267
    06-15-2013, 05:17 PM Go to last post
  25. Post advantages and disadvantages of correlation coefficient

    Hi all, ive been looking at a quetion that says "What is the correlation coefficient, what information does it provide about the way two variables...

    Started by Mosphaitus‎, 08-18-2008 06:12 AM
    • Replies: 1
    • Views: 89,518
    08-18-2008, 08:38 AM Go to last post
  26. finding p-value from F distribution table

    Sorry if I'm creating too many threads, this will be the last (before the test). I'm doing hypothesis test for multi-regression model, and I need...

    Started by hanelliot‎, 06-21-2009 02:02 PM
    • Replies: 3
    • Views: 87,806
    07-26-2012, 10:34 PM Go to last post
  27. The Normal Approximation to the Binomial Distribution

    We can use the normal distribution as a close approximation to the binomial distribution whenever n*p >= 5 and nq >= 5. The mean of the binomial...

    Started by JohnM‎, 03-16-2006 08:36 AM
    • Replies: 1
    • Views: 87,253
    10-22-2008, 05:09 PM Go to last post
  28. Question 3x3 within subjects categorical design – Chi-square inappropriate?

    As a final report for an experimental methodologies class, I have gathered data from a self-constructed experiment on categorical attribution. The...

    Started by RasmusHoell‎, 01-10-2011 10:53 AM
    • Replies: 0
    • Views: 85,587
    01-10-2011, 10:53 AM Go to last post
  29. How to do ANOVA test analysis in Excel 2007?

    Hi everybody, I'm new in this forum and in statistics analysis too, hoping that somebody could help me and I'll really be grateful. I don't...

    Started by statser‎, 02-05-2009 10:51 AM
    • Replies: 11
    • Views: 83,566
    07-06-2009, 10:49 PM Go to last post
  30. Exponential PDFS

    Hey, I need some help with the below questions, any help would be great. Thanks. The length of time in minutes, Y, that a customer spends in line...

    Started by Taka‎, 04-21-2008 10:32 PM
    • Replies: 8
    • Views: 83,498
    04-23-2008, 06:10 AM Go to last post
  31. a theorem about pôwer transformation

    Hi, while studying on Montgomery's Design and Analysis of experiments, i saw a theorem without proof of which I don't find the correct references....

    Started by advmc‎, 08-09-2010 02:43 PM
    • Replies: 1
    • Views: 83,168
    08-09-2010, 03:11 PM Go to last post
  32. Unhappy when to assume equal variances?

    Q:Explain in your own words how you determine whether you assume equal variances or not. Why is it important to do this? I know how/when to apply...

    Started by SadieKhan‎, 07-23-2010 03:12 PM
    • Replies: 7
    • Views: 81,099
    07-25-2010, 08:45 AM Go to last post
  33. difference between ANOVA and T-test

    Hello, my teacher asked me last week if you can use ANOVA to investigate the relation between two variables instead of the unpaired T-test which...

    Started by Leslie‎, 02-07-2008 09:19 AM
    • Replies: 6
    • Views: 80,182
    12-09-2010, 11:18 AM Go to last post
  34. t-Test help: Two-Sample - Difference between assuming equal vs. unequal variances?

    Hello all, I'm needing some help here. I'm trying to figure out whether or not my statistics problem would use the "t-Test: Two-Sample...

    Started by bryan‎, 01-24-2013 02:31 PM
    • Replies: 7
    • Views: 79,163
    01-25-2013, 01:15 AM Go to last post
  35. alpha? p-value?

    Hi everyone, I am very confused with p-value and alpha. I do appreciate your help. Please take a look at the following questions and answers: ...

    Started by jessicaf‎, 05-08-2006 10:54 PM
    • Replies: 7
    • Views: 79,012
    01-03-2012, 09:09 AM Go to last post
  36. Difference between RMS & Standard Deviation

    Hi there, I am trying to figure out the difference between RMS and Standard Deviation. Are they two ways of saying the same thing? I understand...

    Started by tja26‎, 02-13-2006 05:24 AM
    • Replies: 2
    • Views: 69,958
    02-13-2006, 09:56 AM Go to last post
  37. What does a positive t-statistic mean?

    I just worked out a t-statistic for a hypothesis and I got 2.5. When I did the same hypothesis test with random values I ended up with 0.94. Is...

    Started by land144‎, 10-22-2008 02:44 AM
    • Replies: 2
    • Views: 68,643
    10-22-2008, 10:11 AM Go to last post
  38. When to use Z scores or t scores?

    Hi everyone, I have lots of trouble with Z scores and t scores........A lot of times we are given the standard deviation; however, the question...

    Started by jessicaf‎, 05-07-2006 11:12 PM
    • Replies: 3
    • Views: 67,756
    05-09-2006, 06:35 PM Go to last post
  39. One-way ANOVA or Chi².

    Hey guys, I'm busy with a market research case for school and my team is in doubt on which analysis to use. It's important to note that it's not a...

    Started by Dekadez‎, 11-30-2012 11:06 AM
    • Replies: 3
    • Views: 66,312
    12-03-2012, 06:03 AM Go to last post
  40. Comparing 2 percentages - how?

    Hi again guys, I need to compare two percentages. I have the percentage 12% and the percentage 38.5% I need to state if they are significantly...

    Started by laura marie‎, 04-21-2009 06:51 AM
    • Replies: 4
    • Views: 66,230
    04-21-2009, 09:08 PM Go to last post
  41. Please, help me with Cohenƒ2 effect size at linear mixed model

    I analyzed the effect of different genotypes on the appetite supression of the treatment using a mixed-effects model. My fixed factors are gene...

    Started by Estela‎, 02-09-2012 09:00 PM
    • Replies: 0
    • Views: 65,921
    02-09-2012, 09:00 PM Go to last post
  42. How to interpret Jarque Bera results

    Dear all, When I test my data for normality of distribution, I obtain the Jarque Bera value of 280 and a p-value of 0. What does this mean? ...

    Started by LillyLawson‎, 06-23-2010 04:59 AM
    • Replies: 1
    • Views: 65,444
    06-23-2010, 06:19 AM Go to last post
  43. Reporting the skewness statistic in text

    I am writing up my dissertation and need to report a skewness statistic of one of my variables because it is just outside the accepted range to be...

    Started by mandymooples‎, 09-04-2008 07:02 AM
    • Replies: 5
    • Views: 65,266
    01-23-2011, 05:45 PM Go to last post
  44. Help interpreting a statistical symbol "Φ"

    Hello, Please excuse my ignorance - novice. I am currently reading a paper - 'Non-parametric estimators of effect size' by Larry V. Hedges and...

    Started by Shamvir‎, 09-24-2011 06:06 PM
    effect size, median, nonparamtric
    • Replies: 3
    • Views: 63,632
    09-25-2011, 06:04 AM Go to last post
  45. Arrow What is 'Significance F' and what is its forumula?

    My prof is giving us an ANOVA table to fill in with limited data and he pointed to significance f. I thought it was nothing or could find it on my...

    Started by sweetheart‎, 08-07-2010 05:39 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 62,524
    08-08-2010, 12:47 PM Go to last post
  46. Convert z-score to t-score?

    Hi, Is there a standard formula for converting z-scores to t-scores? I found something online that said t = 10z + 50, but I wasn't sure if that's...

    Started by unipsychologist‎, 09-20-2009 07:23 PM
    • Replies: 5
    • Views: 62,407
    06-05-2011, 12:12 PM Go to last post
  47. Consistent MLE of a U(0, θ)

    So the question is: Let X1,.., Xn ∼ U(0, θ). Show that the MLE is consistent. Hint: Let Y=max {X1,... ,Xn}, for any c, P(Y <c)=P(X1 <c,X2...

    Started by calculuskid1‎, 02-09-2013 04:19 PM
    • Replies: 11
    • Views: 59,800
    02-09-2013, 09:14 PM Go to last post
  48. Question calculating means and standard deviation from confidence interval

    Is there anyway to calculate mean and standard deviation if we are given the 95% confidence interval? I have the following interval 1.339-13.833 I...

    Started by Katherine‎, 01-30-2007 04:47 PM
    • Replies: 2
    • Views: 59,541
    01-31-2007, 05:53 PM Go to last post
  49. I don't know how to tell if something is significant or not

    I don't know how to tell if a value passes the critical region or not. What does it mean if something is significant at the .01 level? How do I tell?...

    Started by rhapsody24‎, 10-10-2011 06:04 PM
    • Replies: 7
    • Views: 58,153
    10-11-2011, 10:45 PM Go to last post
  50. Standard deviation of the Ratio of two means

    Hi, guys I have two sets of data: A and B. I want to calculate a ratio of average(A)/average(B). I wonder if there is a way to get the...

    Started by shanshuiii‎, 03-02-2011 05:34 PM
    • Replies: 7
    • Views: 56,873
    07-08-2012, 09:36 AM Go to last post
  51. Negative effect size?

    Hi, I calculated the effect size for the results of Mann-Whitney U tests but some of them are negative. I was double checking the formula and how...

    Started by statn00b‎, 12-15-2011 11:09 AM
    • Replies: 9
    • Views: 56,723
    12-15-2011, 02:15 PM Go to last post
  52. Probability of a Type II error

    I can't seem to figure out how to obtain the probability of type 2 errors from this question. A researcher is conducting a hypothesis test to...

    Started by bobby big dog malone‎, 09-20-2008 02:12 PM
    • Replies: 7
    • Views: 56,636
    09-22-2008, 06:11 PM Go to last post
  53. What does K stand for in an ANOVA procedure?

    I am currently finding the different values that will help me find the value of the ANOVA from a set of data. I am currently trying to find MSTR. Its...

    Started by l0v3n‎, 06-07-2008 03:53 PM
    • Replies: 1
    • Views: 56,517
    06-07-2008, 03:57 PM Go to last post
  54. Need help with point estimate problem

    The problem is 459 selected light bulbs were tested in a laboratory, 291 lasted more than 500 hours. Find a point estimate of the true proportion of...

    Started by maharriso‎, 11-02-2006 11:03 AM
    • Replies: 3
    • Views: 56,427
    10-26-2011, 08:19 AM Go to last post
  55. Correlate a continuous with a binary variable

    Hey everyone. I have a simple problem and was hoping to get your advice with. I am trying to correlate a continuous variable with a binary one....

    Started by Itai‎, 09-12-2011 09:52 AM
    binary, correlation, statistic
    • Replies: 7
    • Views: 54,129
    02-08-2012, 09:43 PM Go to last post
  56. non-parametric post-hoc tests

    Hi, Does anyone know what the proper non-parametric post-hoc test to use with multiple groups? (3, 4, 5). We have run the Kruskal-Wallis anova so...

    Started by JennJoy‎, 05-30-2008 09:47 AM
    • Replies: 7
    • Views: 53,785
    02-24-2011, 07:46 PM Go to last post
  57. Question about Pairwise significance and (in)equality

    Assume that I did a post-hoc test and I found that the means of Group X is not significantly different from Group Y and Group Z, and Group Y is...

    Started by this_barb‎, 05-16-2008 10:11 PM
    • Replies: 4
    • Views: 52,791
    05-24-2008, 08:35 AM Go to last post
  58. Negative Cronbach’s Alpha

    Hi to all, I have a question about the Cronbach’s Alpha. The value that I got is -.30 which is negative! And I found this comment on the spss...

    Started by ghada8888‎, 09-03-2012 07:29 AM
    • Replies: 3
    • Views: 52,550
    09-05-2012, 06:24 AM Go to last post
  59. T-Test and unequal sample sizes

    I am currently interning for a manufacturing company that makes knee implants. I was asked to do a T-test on some test data. There was sterilization...

    Started by Azndude51‎, 06-29-2009 01:50 AM
    • Replies: 1
    • Views: 51,506
    06-29-2009, 05:44 AM Go to last post
  60. Likert Scale Analysis

    Hello all, I am looking to apply a statistical test to some Likert data. My survey responses were scaled 1 to 5 (strongly disagree to strongly...

    Started by theswits‎, 07-04-2006 04:08 PM
    • Replies: 4
    • Views: 50,944
    07-11-2006, 12:00 AM Go to last post

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