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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: 196,988
    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: 66,870
    09-30-2005, 09:44 AM Go to last post
  1. SPSS: in regression test interaction between a continuous and a within subjects var

    I have a SPSS analysis question regarding how to use regression to test for a moderator in a 2 x 2 design when the 2 x 2 design has both a between...

    Started by helwegm‎, 09-05-2008 12:47 PM
    • Replies: 2
    • Views: 11,642
    09-22-2008, 04:13 PM Go to last post
  2. Probability plot: calculating the confidence interval

    Hi, I need to program a function that displays a probability plot for a normal distribution with a confidence interval. I could find sufficient...

    Started by tilo‎, 07-03-2008 03:11 AM
    • Replies: 4
    • Views: 11,612
    07-03-2008, 09:55 AM Go to last post
  3. MANOVA: Can dependent variables correlate each other?

    Hi, I have 2 groups of animals. An animal was tested in a cage. The cage was divided into 4 different locations. I scored the duration the animal...

    Started by Yoshi‎, 05-20-2011 04:54 AM
    • Replies: 4
    • Views: 11,582
    05-24-2011, 08:53 AM Go to last post
  4. Red face Likert scale statistical analysis

    Hi, I am doing research using a questionnaire which uses likert scale ratings. There are 8 different hypotheses and the questionnaire is set up so...

    Started by jimmy41324‎, 04-05-2011 11:48 AM
    analysis, likert scale, statistics
    • Replies: 9
    • Views: 11,565
    04-07-2011, 10:04 AM Go to last post
  5. Why do degrees of freedom matter?

    I work with Generalised Linear Models and we use use tests such as chi squared test and the AIC test to compare how good models are. These tests are...

    Started by amsbam1‎, 12-12-2013 12:34 PM
    • Replies: 6
    • Views: 11,554
    12-12-2013, 02:30 PM Go to last post
  6. Finding IRQ from standard deviation and normal distribution

    Here's my problem. Any help or insight would be greatly appreciated: A report provided a standard deviation on waiting time to single room ...

    Started by lansell‎, 09-30-2011 12:06 AM
    irq, normal distribution, standard deviation
    • Replies: 3
    • Views: 11,547
    09-30-2011, 06:42 PM Go to last post
  7. Simplifying variance and standard deviation formulas

    I am having a problem figuring how to simplify the std variation formula and variance formula. I need to figure what I would use in place of X, in a...

    Started by phly32‎, 06-16-2006 03:48 PM
    • Replies: 1
    • Views: 11,529
    06-28-2006, 04:52 PM Go to last post
  8. Prob Distribution plot in SPSS

    Hi All I am quite surprised that I am not able to get the probability distribution plot in SPSS. I spent quite some time on google and other...

    Started by bsaikrishna‎, 01-22-2011 08:38 PM
    • Replies: 3
    • Views: 11,529
    01-25-2011, 10:26 PM Go to last post
  9. Multiple Regression negative p-values. Help Needed Please.

    This is for a term paper for an undergraduate independent study course. I am using MS Excel 2007 and its Analysis Toolpack. I am performing...

    Started by sl12‎, 05-12-2012 04:02 AM
    • Replies: 3
    • Views: 11,514
    05-14-2012, 09:35 AM Go to last post
  10. Inference about a Population Proportion - Margin of Error and Sample Size

    Last one :) Q: An automobile manufacturer would like to know what proportion of its customers are not satisfied with the service provided by...

    Started by mackerbuddy‎, 12-04-2005 04:19 AM
    • Replies: 3
    • Views: 11,511
    12-04-2005, 10:20 PM Go to last post
  11. Mann Whitney calculator

    Hi, I'm having some problems useing Mann Whitney U test. I've used Win Pepi in the past but for some reason it won't calculate this problem for...

    Started by Bekkasin‎, 06-29-2011 08:37 AM
    • Replies: 1
    • Views: 11,508
    06-30-2011, 11:43 AM Go to last post
  12. 2-Sample or Matched Pairs Test??

    A group of forty male patients at a certain hospital were randomly chosen. This group is then randomly divided into two groups. Group A received...

    Started by jakeddong‎, 05-11-2011 03:38 PM
    • Replies: 3
    • Views: 11,493
    05-11-2011, 10:36 PM Go to last post
  13. Question HELP! - Statistical Significance Problem

    The manufacturer of a daily dietary supplement claims that its product will help people lose weight. The company obtains a random sample of 950 adult...

    Started by istew9‎, 07-15-2010 01:47 PM
    • Replies: 8
    • Views: 11,492
    07-16-2010, 12:32 PM Go to last post
  14. MLE of 1/theta

    I'm stuck on the third part of this question, I think I know how to find the maximum likelihood estimate of theta, but I don't really know what it...

    Started by NicolaR‎, 05-19-2009 10:09 AM
    • Replies: 4
    • Views: 11,483
    05-19-2009, 10:30 PM Go to last post
  15. Statistics 350 Final Studying Help!

    I'm trying to study for my stat 350 final that is tomorrow, i'm getting through the stuff but have ran into a problem that I hardly know where to...

    Started by tjwor‎, 05-14-2009 09:36 PM
    • Replies: 3
    • Views: 11,481
    05-15-2009, 02:44 PM Go to last post
  16. Cronbach Alpha reliability

    I computed cronbach alpha reliability for 14 items 52 cases. it is -1.71!!! The SPSS says: "The value is negative due to a negative average...

    Started by Humphrey‎, 10-24-2006 04:57 AM
    • Replies: 1
    • Views: 11,479
    02-27-2011, 07:17 PM Go to last post
  17. Question Transformation then Standardization...?

    Hi, I was wondering if anyone could answer what is probably quite an obvious question... I've got a dataset with 9 variables, of which I am...

    Started by MCG‎, 12-16-2005 11:30 AM
    • Replies: 3
    • Views: 11,463
    12-18-2005, 12:10 PM Go to last post
  18. class width

    What is the class width of the fourth class? Im a little lost. Is it the difference between two consecutive lower class limit? Im not sure because...

    Started by lolo619‎, 02-06-2007 10:41 AM
    • Replies: 1
    • Views: 11,455
    06-19-2010, 09:38 PM Go to last post
  19. Finding Standard Deviation

    Hello everyone. I am new here, so excuse me if I sound a little too noobish. I am currently faced with the current problem on my homework. It isn't...

    Started by PhatKroger10‎, 12-06-2011 12:05 AM
    2 Pages
    1 2
    • Replies: 23
    • Views: 11,452
    12-06-2011, 02:48 AM Go to last post
  20. Find the P-Value. Use it to test the claim.

    For healthy adults, the mean pH of arterial blood plasma is 7.4. Assume that pH for blood plasma is normally distributed. A new arthritis drug is...

    Started by Spartan2014‎, 04-10-2011 07:49 PM
    • Replies: 3
    • Views: 11,442
    04-10-2011, 09:24 PM Go to last post
  21. weighted least squares confidence interval

    Hi there, I am new and hoping to use the site right and you get to see my first question! I am interested in constructing a 95% confidence...

    Started by leo nidas‎, 08-23-2008 01:27 PM
    • Replies: 2
    • Views: 11,437
    08-25-2008, 12:50 PM Go to last post
  22. Practical significance

    The difference between two mean values is 103 units p-value is 0.00001 at alpha=0.05 95% confidence interval is (50, 150) difference of 100 units...

    Started by _joey‎, 08-07-2012 06:58 AM
    3 Pages
    1 2 3
    • Replies: 41
    • Views: 11,436
    08-08-2012, 12:15 PM Go to last post
  23. Demographic Data Comparison

    I am trying to find a statistical test to determine the difference between two samples of demographic data. Here's a simple example: Sample 1:...

    Started by DataComparer‎, 09-09-2009 04:11 PM
    • Replies: 1
    • Views: 11,421
    09-09-2009, 10:43 PM Go to last post
  24. Unhappy Need help ! Maximum Likelihood Estimator

    Anyone please help me understand this question i`ve been trying it since the last 3 hours... please guide me through it solution... Q. Let X...

    Started by salk87‎, 05-01-2008 04:58 AM
    • Replies: 4
    • Views: 11,416
    05-02-2008, 09:31 AM Go to last post
  25. Pre-post test comparison on Likert data

    I have Likert scale data based on students' self-rating on several course related skills. They rated themselves at the beginning of the course and...

    Started by fredbeth‎, 05-05-2010 12:45 PM
    • Replies: 2
    • Views: 11,414
    05-05-2010, 02:22 PM Go to last post
  26. Correlational design using nominal/ordinal data

    I have a problem that I've been struggling with for some time now. I can't find a standard, non-parametric test that seems to deal with this type of...

    Started by Zenid‎, 01-28-2012 10:04 AM
    2 Pages
    1 2
    • Replies: 27
    • Views: 11,395
    02-03-2012, 08:30 AM Go to last post
  27. Is the distribution of chi-square values is normally distributed?

    Is the distribution of chi-square values is normally distributed?

    Started by Sky84‎, 07-26-2010 01:16 AM
    • Replies: 2
    • Views: 11,380
    07-26-2010, 10:35 AM Go to last post
  28. Confidence Interval One-tailed Test

    Hi, I'm working on a problem for work where a client of ours wants to analyze the use of mobile devices on which they deploy our software. They...

    Started by fretallack‎, 05-20-2011 01:30 PM
    • Replies: 11
    • Views: 11,374
    10-22-2013, 03:54 AM Go to last post
  29. How to Convert from Nominal to Interval

    Hi all... Please guide me...how i can convert nominal scale to interval scale. TQ

    Started by sherry07‎, 12-24-2011 11:32 AM
    • Replies: 6
    • Views: 11,371
    12-25-2011, 11:08 AM Go to last post
  30. ANCOVA violating homoscedasticity

    I've come across a problem in ANCOVA that I can't seem to figure out. I have a sample size of over 600 people. I've got a 2 (male vs female) x 3...

    Started by dfedele84‎, 10-19-2010 10:30 PM
    • Replies: 14
    • Views: 11,351
    02-20-2011, 11:56 AM Go to last post
  31. how use SPSS for calculate dunn test??

    hi. I need to calculate "dunn test" for my data with SPSS software. can ou help me??

    Started by simabs2‎, 04-26-2013 11:40 AM
    • Replies: 1
    • Views: 11,327
    04-26-2013, 12:28 PM Go to last post
  32. Benford's Law: Z-score Formula

    In an archived edition of Journal of Accountancy, an article was published on Benford's Law that included an Excel spread that determines Benford...

    Started by Auditor1‎, 11-03-2007 08:02 PM
    • Replies: 1
    • Views: 11,325
    11-05-2007, 04:24 AM Go to last post
  33. [SOLVED] Time Series vs Repeated Measures

    I'm trying to dabbling in HLM/Multi level models a bit. I come across the terms Time Series Design and Repeated Measures Design frequently. ...

    Started by trinker‎, 01-17-2012 09:58 AM
    • Replies: 3
    • Views: 11,320
    01-17-2012, 05:32 PM Go to last post
  34. 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: 11,301
    12-19-2009, 10:33 AM Go to last post
  35. Exclamation t-test vs ANOVA

    I have received 200 replies to my questionnaire. Based on the responses, I have 80 repsonses from companies based in Australia, whereas the rest are...

    Started by samd69‎, 05-02-2009 02:12 AM
    • Replies: 4
    • Views: 11,262
    05-02-2009, 10:42 PM Go to last post
  36. Power, effect size, sample size explanation

    Would someone please explain or provide a link to an explanation for the following quote: When planning a study, practicing researchers specify an...

    Started by lph2005‎, 02-22-2009 09:47 PM
    • Replies: 3
    • Views: 11,212
    12-13-2010, 03:58 PM Go to last post
  37. How to calculate area of histogram under normal curve

    Hi, Is there is a easy way to calculate the percentage of the histogram under normal curve? I remember that I used to calculate it when I was in...

    Started by pwij2‎, 08-18-2010 05:31 AM
    • Replies: 3
    • Views: 11,209
    08-18-2010, 04:20 PM Go to last post
  38. definition of deviance

    Hi, I have a problem with definition of deviance. In my case I need this for a logistic regression. In Wikipedia or Dobson (A introduction to...

    Started by giordano‎, 02-11-2009 06:17 AM
    • Replies: 1
    • Views: 11,204
    02-11-2009, 05:33 PM Go to last post
  39. Fisher's Z Transformation

    The correlation coefficient between end-systolic volume and end-diastolic volume for the 11 male patients was found to be 0.9666. Using Fisher's Z...

    Started by girugamesh‎, 05-20-2009 07:50 PM
    • Replies: 3
    • Views: 11,186
    05-20-2009, 08:54 PM Go to last post
  40. When to assume Normality

    I am working with a rather large sample (approximately 120). Typically, I would not have any issues justifying normality due to the large sample size...

    Started by lancearmstrong1313‎, 10-15-2011 04:21 PM
    assumptions, normality, sample size
    • Replies: 10
    • Views: 11,177
    10-15-2011, 07:43 PM Go to last post
  41. comparing skewness of two distributions

    I have two (sample) distributions, and I need to test if the skewness of the two distributions is different from each other. Is there a standard...

    Started by sac‎, 06-19-2012 07:38 PM
    • Replies: 4
    • Views: 11,173
    06-20-2012, 02:57 PM Go to last post
  42. How to type stats symbols in word

    Hey guys, simple question, not directly related to statistics but I am trying to copy this Chi squared equation into word from a pdf but it won't let...

    Started by 11jono11‎, 02-14-2011 02:57 PM
    • Replies: 4
    • Views: 11,160
    02-14-2011, 06:00 PM Go to last post
  43. A Soldier in Combat need help with Discussion (Monty Hall)

    Can anyone please tell me in Statistics with the following A number of years ago, there was a popular television game show called "Let's Make a...

    Started by Deshun1970‎, 03-19-2011 06:26 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 11,135
    03-21-2011, 03:26 PM Go to last post
  44. help please!

    Scores this year on the SAT Mathematics test (SAT-M) for students taking the test for the first time are believed to be normally distributed with...

    Started by saramariah‎, 06-29-2010 03:10 AM
    • Replies: 2
    • Views: 11,095
    06-29-2010, 10:56 AM Go to last post
  45. Exclamation When to use Fisher's exact test

    I am working on some statistical issues for work, and have encountered resistance to use of the Fisher's exact test in some cases. They are saying...

    Started by dfrisch‎, 07-24-2008 11:18 PM
    • Replies: 1
    • Views: 11,082
    07-25-2008, 01:09 AM Go to last post
  46. When to assume equal/unequal variances?

    When doing a t-test between two samples, when should I assume their variances are equal and when should I assume they are unequal? Here's my...

    Started by Orngarth‎, 12-16-2009 08:07 PM
    • Replies: 2
    • Views: 11,079
    12-17-2009, 03:01 AM Go to last post
  47. Simple Random Sample vs Random Sample

    Problem: "A computer company employs 100 software engineers and 100 hardware engineers. The personnel manager randomly selects 20 of the software...

    Started by kuthaman‎, 06-26-2012 10:44 AM
    problem, random sample, simple random sample
    • Replies: 6
    • Views: 11,069
    06-26-2012, 04:33 PM Go to last post
  48. Need some helps with my homework please...

    first i want to say hi, my name is jose, and what a cool lil site you guys got here!!! im having some issues with my stats hw, there are like 12...

    Started by Kidcaffeine‎, 05-01-2008 08:15 AM
    • Replies: 2
    • Views: 11,064
    05-02-2008, 06:28 AM Go to last post
  49. Moment Generating Function help

    Can anyone help me with this problem? If Y has a binomial distribution with n trials and probability of success p, show that the moment-generating...

    Started by statnoob‎, 10-05-2010 09:46 AM
    • Replies: 2
    • Views: 11,056
    10-06-2010, 12:46 PM Go to last post
  50. About weighted kappa!

    Hi I want to measure the intra-examiner agreement (reliability) for ordinal data using weighted kappa I used MedCalc and it gave me 2...

    Started by ONSO‎, 12-29-2009 10:26 AM
    • Replies: 4
    • Views: 11,054
    01-03-2010, 01:02 AM Go to last post
  51. standard error of ratio of coefficients

    hi all, I am interested in the ratio of two regression coefficients. Is it possible to obtain a standard error for such a ratio? eg: I...

    Started by dragonflyFZX‎, 02-01-2007 08:07 AM
    • Replies: 2
    • Views: 11,045
    02-05-2007, 12:48 AM Go to last post
  52. Linear vs. Quadratic in Comparisons - Why?

    Hello, I have a set of data for the level of antioxidants in tea, with two variables (water temperature of either 70 or 90 degrees, and steeping...

    Started by junglerat2‎, 01-21-2007 12:28 AM
    • Replies: 2
    • Views: 11,043
    01-29-2007, 09:16 PM Go to last post
  53. Help with comprehending output from proc reg

    So I just ran my very first regression and the data output is pasted below (I've also attached the .txt file) ...

    Started by david_q‎, 02-11-2012 01:12 PM
    3 Pages
    1 2 3
    • Replies: 32
    • Views: 11,041
    02-13-2012, 02:11 PM Go to last post
  54. Thumbs up Ti-83 for Anova & Tukey Tests

    I found a ti-83 program written by James D. Jones at <http://people.richland.edu/james/ti82/download.html> that does ANOVA test and then Tukey-Kramer...

    Started by ealeql‎, 10-23-2010 05:18 PM
    • Replies: 2
    • Views: 11,017
    10-23-2010, 08:35 PM Go to last post
  55. Question transforming negatively skewed data then running tests

    Hello! I want to do a paired t-test on some data. 1 of my pair isn't normally distributed and has a negative skew. I reverse scored it then ran a...

    Started by mizmiz‎, 04-03-2009 09:14 AM
    • Replies: 2
    • Views: 11,008
    04-07-2009, 06:23 AM Go to last post
  56. Chi square ok for questionnaire responses?

    Hi, A friend has asked me for some help with statistical analysis of responses to a questionnaire that she conducted as part of her dissertation....

    Started by BJ82‎, 04-02-2009 06:52 AM
    • Replies: 2
    • Views: 11,001
    04-03-2009, 03:04 PM Go to last post
  57. Categorical and ordinal scale....chi square?

    Hi I am seeking help on this issue. I have a categorical variable namely gender (male x female) and an ordinal variable about perception of a...

    Started by Mohamed Afifi‎, 08-20-2012 04:12 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 11,001
    08-24-2012, 01:28 PM Go to last post
  58. Confidence Interval Problems (unknown S.D.)

    Problem 1: {Exercise 8.17} The International Air Transport Association surveys business travelers to develop quality ratings for transatlantic...

    Started by Silverfox‎, 11-21-2007 08:11 PM
    • Replies: 0
    • Views: 10,987
    11-21-2007, 08:11 PM Go to last post
  59. Smile Hypothesis

    Question:Identify the null hypothesis, alternative hypothesis, test statistic, P-value, conclusion about the null hypothesis, and final conclusion...

    Started by DennyHamlinlover‎, 10-28-2007 11:59 AM
    • Replies: 1
    • Views: 10,984
    10-28-2007, 05:26 PM Go to last post
  60. How to calculate Pvalue of allele frequencies of two groups using Fisher's exact test

    I would like to know how to calculate P value of the allele frequencies of two different groups using Fisher's exact test. Following are the data :...

    Started by drharishc‎, 07-28-2012 12:06 PM
    • Replies: 3
    • Views: 10,964
    08-04-2012, 10:35 AM Go to last post

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