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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: 196,713
    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: 66,732
    09-30-2005, 09:44 AM Go to last post
  1. Sampling distributions related to normal distribution

    iid=independent and identically distributed This is the model answer to a question which is unlikely to be wrong. I don't understand the part...

    Started by kingwinner‎, 01-14-2009 12:37 AM
    • Replies: 7
    • Views: 3,578
    01-16-2009, 04:53 AM Go to last post
  2. Mixed Repeated Measures ANOVA - some questions

    I have run an experiment and am analysing the results using a mixed RM ANOVA in SPSS. I have two queries, which I hope you can help me with. I...

    Started by garywood84‎, 01-17-2009 07:23 PM
    • Replies: 7
    • Views: 24,538
    05-19-2009, 08:55 PM Go to last post
  3. Comparing 2 regression models

    Hello, I've estimated two regression models: 1. y=ax 2. y= ax + b I guess the question I'm trying to address is whether adding a constant...

    Started by pontipilat‎, 01-17-2009 12:42 PM
    • Replies: 7
    • Views: 4,688
    01-19-2009, 04:24 PM Go to last post
  4. Beta distribution

    Hi, Could you please advise how to estimate the 95% confidence interval for the mean if the data which follows a beta distribution? Thank you...

    Started by schmidt1‎, 01-24-2009 08:29 AM
    • Replies: 7
    • Views: 12,642
    01-26-2009, 03:32 PM Go to last post
  5. Question Help please! Homogeneity of variance violated

    Hi all, I'm in need of help - I'm trying to run a one-way ANOVA with 4 groups and I've just realised that the homogeneity of variance is violated. ...

    Started by princesszelda‎, 01-25-2009 10:10 PM
    • Replies: 7
    • Views: 13,932
    01-26-2009, 06:38 AM Go to last post
  6. My null-hypothesis

    Hi, I'm trying to test a hypothesis of a relationship y = b0 + b1x + b2z NOT including z. In other words, I'm trying to show that z = 0. What...

    Started by pontipilat‎, 01-26-2009 08:25 PM
    • Replies: 7
    • Views: 3,298
    01-26-2009, 10:04 PM Go to last post
  7. Statistical Significance

    Hi I'm kinda new at statistics. I was wondering if it would be correct to say that the response rate that you get back from a survey is...

    Started by apdragon‎, 01-29-2009 02:29 PM
    • Replies: 7
    • Views: 4,497
    01-30-2009, 04:35 PM Go to last post
  8. What Constitutes "better"?

    I have this problem for homework: I'm not sure what it's asking. Does it want me to find the largest area and base the best life span on that...

    Started by WhoCares357‎, 02-02-2009 08:43 PM
    • Replies: 7
    • Views: 3,916
    02-02-2009, 11:32 PM Go to last post
  9. Probability help...

    Hey, I'm new here and somewhat new to statistics. I have been doing a bit of homework lately, and have been stuck on a relatively simple problem and...

    Started by johnny butt‎, 02-10-2009 02:03 AM
    • Replies: 7
    • Views: 5,039
    02-11-2009, 02:39 AM Go to last post
  10. Help with finding appropriate statistical method

    Hello, I'm doing research on diet effects. There were 3 measurements (1,2,3) of two groups (diet group which used diet tehniques, and control...

    Started by ynos‎, 02-25-2009 02:57 PM
    • Replies: 7
    • Views: 3,335
    03-10-2009, 11:15 AM Go to last post
  11. Not sure what to 'do' with my data

    Hi all, this is my first post here and I have a real pushing-my-luck question! Basically I have no idea what I want to ‘find’ in my data. I am...

    Started by laura marie‎, 03-13-2009 10:00 AM
    • Replies: 7
    • Views: 2,518
    03-14-2009, 08:59 AM Go to last post
  12. Looking Up / Interpreting p Value for z values

    Hi all, Another question. May be a silly question but my brain often gets tangled when going from book to application. After hours of...

    Started by Fred‎, 04-09-2009 10:52 AM
    • Replies: 7
    • Views: 7,369
    04-14-2009, 05:47 AM Go to last post
  13. What stats test do I need to find a correlation/association/relationship?

    Hello, I have a question I am hoping someone can help me with. I am trying to see if there is association with a particular disease and an...

    Started by medstudent1‎, 04-15-2009 02:44 PM
    • Replies: 7
    • Views: 3,752
    04-18-2009, 01:37 AM Go to last post
  14. binary logistic regression: distribution of the dependent variable

    Hi, I would like to know if the number of observation in each category of the dependant variable can produce wrong results when you do a binary...

    Started by N3M0‎, 04-24-2009 04:42 AM
    • Replies: 7
    • Views: 6,105
    05-02-2009, 11:31 AM Go to last post
  15. Significantly the same?

    How do you test if two groups are significantly the same? When you do a significance test of two groups and p<.05, we can be confident that they...

    Started by nickleby‎, 05-26-2009 09:36 AM
    • Replies: 7
    • Views: 7,218
    05-28-2009, 08:26 PM Go to last post
  16. Survey Size

    I have taken statistics before in college and grad school (MBA), but I am so foggy. I have a simple 10 question survey I am administering in Survey...

    Started by aquabella47‎, 06-12-2009 06:30 PM
    • Replies: 7
    • Views: 6,013
    06-16-2009, 09:27 PM Go to last post
  17. What to do when interaction occurrs

    Hi all, I have a question about interaction when running an ANOVA. Here is a summary of my test: measuring machine accuracy under 2 treatments...

    Started by roryg‎, 07-01-2009 06:18 PM
    • Replies: 7
    • Views: 3,680
    07-02-2009, 02:53 PM Go to last post
  18. Help me please ... How to calculate the next element

    Hello, My boss has just asked me to come up with a formula which allows me to calculate the dow jones odds. I have all the dow jones values since...

    Started by arkguil‎, 08-04-2009 07:45 AM
    • Replies: 7
    • Views: 4,168
    08-11-2009, 08:29 AM Go to last post
  19. Help! Correlation between Categorical Data & Interval data

    Hi, I am looking for some basic stats help and would appreciate any and all feedback! Thank you in advance! 1. I am trying to correlate...

    Started by Frenz5iron‎, 08-06-2009 11:32 AM
    • Replies: 7
    • Views: 22,529
    08-11-2009, 02:36 PM Go to last post
  20. two way ancova problem

    I have to analyze a set of data, and while I know roughly what I'm doing, I am having some problems making conclusions. I will outline the data and...

    Started by boogers‎, 09-28-2009 08:44 AM
    • Replies: 7
    • Views: 8,427
    09-28-2009, 02:39 PM Go to last post
  21. Standard Error Question!

    Hi all, I have a sample of 200 cars (45 bmw, 35 saab, 55 audi & 65 toyota). I am supposed to find the standard error. Standard Error =...

    Started by canon14‎, 10-05-2009 06:36 AM
    • Replies: 7
    • Views: 3,185
    10-08-2009, 06:17 AM Go to last post
  22. When SD is calculated from SE

    I have a question about what the standard deviation means when it's calculated from the standard error. Here's the scenario: I'm looking at a...

    Started by Barnzilla‎, 10-07-2009 08:23 AM
    • Replies: 7
    • Views: 5,487
    10-07-2009, 07:48 PM Go to last post
  23. Interpreting linear correlation

    Hello, This may be a trivial (or naive) question, but I would appreciate your input. I'm working on a company text for a presentation (I didn't...

    Started by arkona‎, 10-28-2009 04:25 PM
    • Replies: 7
    • Views: 4,347
    10-30-2009, 12:46 PM Go to last post
  24. F-test

    The problem is about comparing two investments and see if A has a higher standard deviation than B in return. σ_a= 1,73864 and σ_b=1,28369 F...

    Started by mandarine‎, 10-29-2009 04:54 PM
    • Replies: 7
    • Views: 2,459
    10-31-2009, 07:59 AM Go to last post
  25. Correlation (data need to be normall distributed?)

    Hi, today, I read through the chapter 'correlation' and there it is stated: the condition to apply either regression or correlation is that...

    Started by beginner‎, 11-14-2009 12:35 PM
    • Replies: 7
    • Views: 21,197
    11-22-2009, 07:12 PM Go to last post
  26. Explain standard deviation formula

    Hi all, We take the square root of variance to get the standard deviation, right? And the reason is that variance units are in square terms....

    Started by beemzet‎, 11-28-2009 05:34 PM
    • Replies: 7
    • Views: 9,186
    09-12-2010, 12:44 PM Go to last post
  27. Interpreting chi square results

    Would appreciate help interpreting this contingency table and chi square results (not real data, just for illustration purposes). Trying to see if...

    Started by jawon‎, 12-04-2009 07:33 PM
    • Replies: 7
    • Views: 11,261
    12-19-2009, 10:33 AM Go to last post
  28. 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: 9,776
    12-06-2009, 09:21 AM Go to last post
  29. Question j curve ?

    Hi, Hoping somebody can help. I am looking at some exam results. They reach a ceiling and the resulting histogram is ski jump shaped ? Can I treat...

    Started by mattforfree‎, 12-31-2009 04:05 PM
    • Replies: 7
    • Views: 3,297
    01-03-2010, 11:47 AM Go to last post
  30. What are the popular journals in statistics?

    Hi all, I am wondering whether anyone can give me a list of those popular journals in the statistics. Or a search engine is even more helpful. ...

    Started by ygao‎, 01-03-2010 11:54 PM
    • Replies: 7
    • Views: 4,578
    01-05-2010, 03:23 AM Go to last post
  31. Which paper proposed chi square distribution?

    Hi all, I am wondering who is the first one to discover the chi square distribution and what paper he/she published? Thx in advance. yg

    Started by ygao‎, 01-05-2010 01:38 PM
    • Replies: 7
    • Views: 5,418
    01-05-2010, 05:15 PM Go to last post
  32. Warning message in Regression analysis

    Hi there, I am working on my stats for my masters degree and am running a regression and receive the following message: "For models with your...

    Started by LearningStats6‎, 01-09-2010 07:49 PM
    • Replies: 7
    • Views: 16,252
    01-10-2010, 11:26 AM Go to last post
  33. how to use ANOVA in excel-Please HELP!

    Hi, I need to use 2way ANOVA in excel but I always get the error of "input range contains non-numeric data". I am guessing this happens because I...

    Started by baris‎, 03-04-2010 05:49 PM
    • Replies: 7
    • Views: 18,698
    05-08-2010, 12:52 AM Go to last post
  34. difference in overall satisfaction with different types of vehicles purchased

    hi, I am new to statistics and was looking for guidance re the below. I am confused as to which statistical test i should run to examine the...

    Started by bob123‎, 03-12-2010 01:25 AM
    • Replies: 7
    • Views: 4,560
    03-12-2010, 06:50 AM Go to last post
  35. Shapiro-Wilk test for large samples

    Hi all, does anyone know a routine with which to calculate the Shapiro-Wilk test statistic and corresponding p-values for sample sizes of >10000?...

    Started by choschech‎, 03-22-2010 04:36 PM
    • Replies: 7
    • Views: 15,043
    03-25-2010, 04:21 PM Go to last post
  36. TI calculator

    Am trying to buy a new calculator for stats, I have a TI 82 but it seems rather limited as we advance in the book. Any recommendations for a more...

    Started by gg4bella‎, 05-06-2010 11:23 PM
    • Replies: 7
    • Views: 3,293
    05-08-2010, 01:04 PM Go to last post
  37. Need some help with comparison

    Hello, The first question is: I've got a sample (39 samples) of IQ from men and women, now we have to decide whether there is a significant...

    Started by Barry1337‎, 06-22-2010 04:55 AM
    • Replies: 7
    • Views: 3,462
    06-22-2010, 01:58 PM Go to last post
  38. correct use of chi-square?

    Hi, I have hit rates for five categories (A-E), each under three conditions (x,y,z). (Please see attached table.) I'm wondering whether I...

    Started by composer‎, 06-27-2010 12:29 PM
    • Replies: 7
    • Views: 2,927
    07-01-2010, 10:24 AM Go to last post
  39. Very simple question

    What is the best way to determine something as simple as finding out whether the following test grades are improving (in a sequence): 46, 52,...

    Started by abelian‎, 06-29-2010 01:54 PM
    • Replies: 7
    • Views: 2,803
    06-30-2010, 09:56 AM Go to last post
  40. Question p and F value confusion!!!

    Hi, I am hoping someone can explain why when i run an ANOVA at 95% the F>f(crit) and p<0.05, but when i ran it again at 99% the F<f(crit) but...

    Started by sqrt‎, 07-07-2010 09:10 PM
    • Replies: 7
    • Views: 6,412
    07-11-2010, 07:48 PM Go to last post
  41. Comparing percentages

    Hi, this is my first post on here so I hope it's in the right place! I have been doing some research using a large hospital database. I want to...

    Started by lauri195‎, 07-18-2010 02:53 PM
    • Replies: 7
    • Views: 12,496
    07-19-2010, 07:48 PM Go to last post
  42. 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: 78,734
    07-25-2010, 08:45 AM Go to last post
  43. Fair Coin... Chi square or binomial?

    Hello all, this is my first post, so please be gentle with me. When testing whether a coin is fair or not, is it correct to use the binomial...

    Started by TheDuck‎, 08-28-2010 09:03 PM
    • Replies: 7
    • Views: 18,501
    08-29-2010, 01:24 PM Go to last post
  44. i need you opinion

    i would like to ask: if i have a some independent variables and i want to do the bivariant analysis to test their association an outcome...

    Started by nurul‎, 09-15-2010 04:53 AM
    • Replies: 7
    • Views: 2,979
    09-18-2010, 05:28 AM Go to last post
  45. Binomial Distribution

    Hello All, I have a basic question regarding binomial distribution. A survey is taken from 1,000 people. 625 answered yes and 375 answered no....

    Started by bej0520‎, 09-16-2010 11:42 AM
    • Replies: 7
    • Views: 3,159
    09-16-2010, 02:24 PM Go to last post
  46. Residual error estimate

    Consider a regression model: E(Y|x) = \alpha + \beta x + \epsilon where \epsilon ~ N(0, {\sigma}^2) . Find a point estimate of ...

    Started by madara123‎, 09-17-2010 08:25 PM
    • Replies: 7
    • Views: 7,286
    09-17-2010, 10:25 PM Go to last post
  47. 68-95-99.7 rule

    I have finally figured out the standard deviation and think I am getting the hang of distribution on a bell-shaped curve. What I don't understand...

    Started by jenclark242‎, 09-24-2010 08:59 AM
    • Replies: 7
    • Views: 5,795
    09-27-2010, 12:39 PM Go to last post
  48. Binomial or Poisson dist.?

    Testing for a disease. has 0.02 probability of giving a false-positive reading and probability of 0.03 of giving a false-negative result. (a...

    Started by gator78‎, 10-17-2010 07:50 PM
    • Replies: 7
    • Views: 4,501
    10-24-2010, 05:20 PM Go to last post
  49. Test Hypothesis

    If a test hypothesis has a Type 1 error probability of .05 this means? a if the null hypothesis is true we dont reject if 5% of the time b if the...

    Started by jprescottjr‎, 11-03-2010 10:02 PM
    • Replies: 7
    • Views: 4,919
    11-04-2010, 12:47 AM Go to last post
  50. mid-class values

    The following table gives the ages in completed years of 141 persons in a town involved in road accidents during a particular year. Ages (years):...

    Started by furor celtica‎, 11-07-2010 04:26 AM
    • Replies: 7
    • Views: 9,370
    11-12-2010, 08:18 AM Go to last post
  51. 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: 9,785
    11-12-2010, 07:10 PM Go to last post
  52. ANOVA testing!

    Your professor is interested in how to effectively teach statistics to undergraduates so he randomly selects 21 students from the undergraduate...

    Started by mtton‎, 11-15-2010 01:06 PM
    • Replies: 7
    • Views: 4,562
    11-15-2010, 09:25 PM Go to last post
  53. Likert Scale Analysis - How to?

    Greetings, I am new to Talk Stat and could use some help. Background: I did a survey on the effects of ISO 9000 on business performance using a...

    Started by stammx‎, 11-28-2010 09:33 PM
    • Replies: 7
    • Views: 7,847
    11-30-2010, 12:47 AM Go to last post
  54. Testing for differences between correlations

    I'm looking to correlate three measurements of participants with a fourth variable, yielding three non-independent correlation coefficients. I would ...

    Started by jwallin‎, 12-02-2010 05:17 PM
    • Replies: 7
    • Views: 3,581
    12-03-2010, 12:24 AM Go to last post
  55. T test

    Hi, So I have been working hard on a project. However, I am a little stuck. For the question, " How well did students’ estimates of ‘how many...

    Started by loathesome‎, 12-03-2010 01:12 AM
    • Replies: 7
    • Views: 3,497
    12-03-2010, 02:46 AM Go to last post
  56. Random variables problem

    Hello all. I'm having a lot of trouble with several of the problems on my latest stat homework. Up until now I've understood almost everything, but...

    Started by player‎, 12-06-2010 08:54 PM
    • Replies: 7
    • Views: 4,187
    12-07-2010, 10:27 AM Go to last post
  57. two mean sample hypothesis testing

    Hi i need help with this question. In a study by Mino et. al. (2006), 50 workers in high-stress jobs were randomly split between a stress-management...

    Started by Math085‎, 12-07-2010 11:04 PM
    • Replies: 7
    • Views: 2,993
    12-08-2010, 12:52 AM Go to last post
  58. outliers

    Hi, I know Median and Mode aren't effected by outliers but which of these is least affected by extreme values? Thanks

    Started by SadieKhan‎, 12-09-2010 04:14 AM
    • Replies: 7
    • Views: 4,072
    12-10-2010, 12:02 PM Go to last post
  59. lognormal

    How do I find the p50 value in a lognormal distribution given p10 and p90 using excel/@RISK ??

    Started by stat_RA‎, 01-14-2011 04:09 PM
    • Replies: 7
    • Views: 10,767
    01-15-2011, 05:59 AM Go to last post
  60. Normal and Standard normal distributed variable

    What is the benefit of switching from a normal distributed variable to standard normally distributed variable ?

    Started by johny_5‎, 01-18-2011 08:29 AM
    • Replies: 7
    • Views: 7,498
    01-20-2011, 04:56 AM Go to last post

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