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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. 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: 66,663
    09-30-2005, 09:44 AM Go to last post
  2. 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: 196,642
    07-16-2014, 11:01 AM Go to last post
  1. Desparately need help

    I have a stat problem that I need to get in by the end of the day and I have no clue how to start it! Here's the problem: During one of the...

    Started by tobby‎, 12-12-2006 02:06 PM
    • Replies: 0
    • Views: 2,220
    12-12-2006, 02:06 PM Go to last post
  2. How to calculate log mean standard deviation of two numbers?

    I have a journal paper which says they calculated coefficient of variations based on log mean average (LMA) values. Now, I know that log mean average...

    Started by kpj‎, 12-12-2006 02:14 PM
    • Replies: 0
    • Views: 4,554
    12-12-2006, 02:14 PM Go to last post
  3. Confidence Interval: Adjusted Wald Method

    If I am conducting an experiment on 10 people and all 10 performed a task successfully, I want to know how to determine the confidence interval. I...

    Started by erand‎, 12-12-2006 12:11 PM
    • Replies: 4
    • Views: 16,758
    12-12-2006, 04:59 PM Go to last post
  4. Peak over threshold (POT)method

    I am trying to understand how the POT method works in estimating extreme events. Does anyone have an idea?

    Started by Naomikreinz‎, 12-12-2006 05:26 PM
    • Replies: 0
    • Views: 4,924
    12-12-2006, 05:26 PM Go to last post
  5. Wilcoxon signed rank test help

    Hi - I have data that I wish to perform this statistical test upon but there are a few things i am unsure about, i hope somebody can help! The...

    Started by Aaron‎, 12-13-2006 12:14 AM
    • Replies: 0
    • Views: 4,041
    12-13-2006, 12:14 AM Go to last post
  6. Question Does this finding seem odd to you? Help!

    I need some advice. I am finding strange bivariate correlations among my vairables of interest... there are strong patterns of findings that appear...

    Started by merry‎, 12-12-2006 01:36 PM
    • Replies: 1
    • Views: 2,879
    12-13-2006, 02:36 AM Go to last post
  7. Correlation and Regression on Excel?

    HOW?! a. Draw scatter plot for the variables b. Compute the value of the correlation coefficient. c. State the hyptothesis. 12. A medical...

    Started by benchiefjr‎, 12-10-2006 07:58 PM
    • Replies: 6
    • Views: 4,163
    12-13-2006, 02:48 AM Go to last post
  8. Please help!

    Hi, I have a question: in a hierarchical regression when subsequent variables (X3 and X4) that are added later on results in the original variable...

    Started by 12345‎, 12-13-2006 01:08 AM
    • Replies: 1
    • Views: 2,244
    12-13-2006, 03:09 AM Go to last post
  9. probability density function of dependent variables

    Hi, I am currently trying to derive the joint probability density function for two random dependent variables each with a marginal distribution...

    Started by daniellem‎, 12-12-2006 11:42 PM
    • Replies: 1
    • Views: 5,426
    12-13-2006, 03:17 AM Go to last post
  10. Hypothesis Testing

    Need to know the test that will be performed on the following question: The data comprises hours devoted to patient care per week for...

    Started by thedeath‎, 11-04-2006 03:08 AM
    2 Pages
    1 2
    • Replies: 26
    • Views: 8,443
    12-13-2006, 03:39 AM Go to last post
  11. Question Respondents belong to >1 group-what do I do??

    I am using a chi-square test to look for group differences in assessment use between four organizations bound by ethics codes. Some of the...

    Started by hstanbridge‎, 12-12-2006 07:57 PM
    • Replies: 1
    • Views: 2,229
    12-13-2006, 03:51 AM Go to last post
  12. Please Help..(check answers)

    Can someone help me on these statistic questions. (FYI:i am not really good with probability..) 1.Family size can be represented by the random...

    Started by Stunt101‎, 12-11-2006 07:24 PM
    • Replies: 2
    • Views: 3,993
    12-13-2006, 06:04 AM Go to last post
  13. level of significance

    A researcher claims the mean IQ of students in the Faculty of Medicine exceeds that of students in other faculties. It is known that the mean IQ of...

    Started by sweetx‎, 12-06-2006 08:53 PM
    • Replies: 1
    • Views: 3,643
    12-13-2006, 06:16 AM Go to last post
  14. Which test should I use?

    Hi everyone, some help please? I have performed 8 chemical experiments in which the result of each is a percentage. 4 were done under 1 condition...

    Started by thedude‎, 12-13-2006 08:39 AM
    • Replies: 3
    • Views: 2,321
    12-14-2006, 02:18 AM Go to last post
  15. Confused with the wording Ho H1 claim

    At a small college it was reported that no more then 20% of the students commute more then 10 miles. A random sample of 100 students showed that 24...

    Started by trumancollege‎, 12-13-2006 04:07 AM
    • Replies: 2
    • Views: 4,043
    12-14-2006, 06:07 AM Go to last post
  16. need clarification to an earlier post/reply

    Hi ...I would like clarification on one point from a reply I got from JohnM. I replied to his reply asking for clarification - but have not heard...

    Started by ehb23‎, 12-14-2006 06:10 AM
    • Replies: 0
    • Views: 2,015
    12-14-2006, 06:10 AM Go to last post
  17. help with streamflow data

    I have a several-step problem here and not sure how to go about it. Any advice would be appreciated. I have streamflow data (daily average...

    Started by ariklee‎, 12-14-2006 04:16 PM
    • Replies: 0
    • Views: 2,005
    12-14-2006, 04:16 PM Go to last post
  18. Comparing Correlations/Regressions?

    Hi, I just have a quick question: I am doing a bit of EDA on some biodiversity data in regards to species richness of various taxa in relation to...

    Started by revolutiondeathsquad‎, 12-14-2006 04:20 PM
    • Replies: 0
    • Views: 1,990
    12-14-2006, 04:20 PM Go to last post
  19. Multicollinearity - Variance Inflation Factors

    Hi I am doing a linear regression coursework project and am having some difficulties I hope someone can help me with. I am analysing the VIFs for...

    Started by csd8254‎, 12-15-2006 08:12 AM
    • Replies: 0
    • Views: 2,844
    12-15-2006, 08:12 AM Go to last post
  20. Non zero P value for T test

    Here is a basic question. A person I know has a dataset with two columns. When they do a normality test for each column, it passes. One they do a...

    Started by RandyLewisKemp‎, 12-14-2006 03:33 PM
    • Replies: 2
    • Views: 2,824
    12-15-2006, 08:25 AM Go to last post
  21. Advice on type of test to use

    Hi guys. I have performed a study looking a 2 groups of people and how a particular blood test may be related to a disease. My two groups are 1)...

    Started by osiris‎, 12-13-2006 11:03 AM
    • Replies: 1
    • Views: 2,358
    12-15-2006, 06:31 PM Go to last post
  22. Regression Equation question

    Can you tell me, if you have a regression equation with two partial regression coefficients (slopes), can you guestimate the p-values for each...

    Started by achancemtg‎, 12-13-2006 03:15 PM
    • Replies: 1
    • Views: 2,639
    12-15-2006, 06:33 PM Go to last post
  23. Test for proportion

    Hi. Example 1: Say I have a sample of rolls of a dice which may be 'uneven' Say I have 10000 rolls, 1000 came up 1, 1000 came up 2, 2000 came up...

    Started by naivesincerity‎, 12-15-2006 10:56 AM
    • Replies: 2
    • Views: 2,577
    12-17-2006, 07:59 AM Go to last post
  24. Conditional Pobability

    _ _ Can anyone tell me how to calculate P(AB) , P(A), and P(B/A) when all I have _ is P(B) ...

    Started by Cassius‎, 12-17-2006 06:40 AM
    • Replies: 3
    • Views: 2,281
    12-17-2006, 08:09 AM Go to last post
  25. Help?!

    I have a few questions that I'm not sure how to approach, or why it's wrong (or what is the correct answer for that matter. To begin: I have no...

    Started by Edward‎, 12-17-2006 08:58 PM
    • Replies: 0
    • Views: 1,712
    12-17-2006, 08:58 PM Go to last post
  26. Smile Test Question help

    Dear friends:o , I have been given the opportunity to get some extra credit points from a test I recently took (points which are desperately...

    Started by Foro‎, 12-16-2006 07:10 PM
    • Replies: 3
    • Views: 2,080
    12-18-2006, 12:34 AM Go to last post
  27. Confirmatory Factor analysis

    Perhaops this question is a little too advanced for this forum, but I will give it a try. I am doing CFA in AMOS and I am getting rather bad fit...

    Started by deram‎, 12-18-2006 05:02 AM
    • Replies: 0
    • Views: 2,510
    12-18-2006, 05:02 AM Go to last post
  28. Help!

    I have been working on this for almost 24 hours! Can someone please help me with this problem... here's what i have gotten so far: this is for...

    Started by mkelly‎, 12-17-2006 02:56 PM
    • Replies: 1
    • Views: 2,054
    12-18-2006, 02:30 PM Go to last post
  29. Binomial Distribution, I think HELP!!!

    I have a problem that states: An insurance company will insure a $75,000 Hummer for its full value against theft at a permium of $1,500 per year....

    Started by Tflipp‎, 12-14-2006 04:38 PM
    • Replies: 1
    • Views: 6,292
    12-18-2006, 03:14 PM Go to last post
  30. 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: 9,522
    12-19-2006, 07:23 AM Go to last post
  31. Kolmogorov-Smirnov Z - how to calculate effect size??

    Hi there, A similar question to Laura's- how do I calculate effect sizes for the Kolmogorov-Smirnov Z? Is the Z value given by SPSS what I need,...

    Started by Arekushia‎, 12-19-2006 07:32 AM
    • Replies: 0
    • Views: 8,761
    12-19-2006, 07:32 AM Go to last post
  32. How large a sample do I need?

    I want to test a postcard. I have a list of 15,000 names, 4,000 of whom have already signed up for information. I want to mail an offer to some...

    Started by rrosenwald‎, 12-18-2006 03:57 PM
    • Replies: 1
    • Views: 3,307
    12-19-2006, 03:02 PM Go to last post
  33. standard normal distribution/ PLEASE HELP

    I have this question: Men are eligible for this club if they are 74in tall. what percentage of men are eligible to join the club. also the mean of...

    Started by agirl‎, 12-19-2006 09:21 PM
    • Replies: 2
    • Views: 4,906
    12-20-2006, 04:28 PM Go to last post
  34. Test of Significance

    Hello, I performed a small experiment for my biology class, where I compared pulse rate after running on 2 legs, and pulse rate after running on 4...

    Started by AlexKom‎, 12-16-2006 02:04 PM
    • Replies: 3
    • Views: 2,577
    12-20-2006, 05:08 PM Go to last post
  35. Determing sample size

    Any help appreciated!!! What is the formula I need to use if I want to determine sample size for an unknown population (the number of workers)...

    Started by jewlb123‎, 12-20-2006 06:17 PM
    • Replies: 0
    • Views: 1,967
    12-20-2006, 06:17 PM Go to last post
  36. Hypothesis Test

    I am trying to understand the hypothesis test - specifically, which side of the normal curve the rejection region should lie and what my answer...

    Started by NnmB35‎, 12-20-2006 01:06 PM
    • Replies: 1
    • Views: 1,965
    12-20-2006, 10:20 PM Go to last post
  37. Another proportion question-help much appreciated

    Say I know 3000 people were canvassed by a political party, 2200 of them went out to vote. Of the 7000 not canvassed, 4000 went to vote. What...

    Started by naivesincerity‎, 12-17-2006 10:10 AM
    • Replies: 2
    • Views: 2,424
    12-21-2006, 08:46 AM Go to last post
  38. Comparing two proportions in dependent samples

    Hello, I am interested in comparing the precision of two classification models, A and B, when I have only the following information: The number...

    Started by Gaston‎, 12-21-2006 09:08 AM
    • Replies: 0
    • Views: 6,292
    12-21-2006, 09:08 AM Go to last post
  39. strenght of relationship and nonlinearity of r

    If one goes from r (correlation coefficient) 0.2 to 0.3 (0.1 difference) or from 0.8 to 0.9 (same difference) the strenght of the relationship is not...

    Started by Dio777‎, 12-21-2006 11:38 PM
    • Replies: 0
    • Views: 3,095
    12-21-2006, 11:38 PM Go to last post
  40. Chance

    I am not exactly sure of the correct statistical method to execute this problem" A fair coin was flipped 10 times, compute the chance that the...

    Started by kanga‎, 12-19-2006 10:20 PM
    • Replies: 2
    • Views: 2,179
    12-22-2006, 12:53 AM Go to last post
  41. degress of freedom aren't explained well

    Why do we divide with n-1 instead of n, when population variance is estimated from the sample? Yes, sample will have less variability, so our...

    Started by Dio777‎, 12-21-2006 11:32 PM
    • Replies: 2
    • Views: 2,740
    12-26-2006, 01:41 PM Go to last post
  42. Correlation. Im stuck, Pls help

    Im in desperate need and im stuck: Can someone plsease tell me where im going wrong with this question. Calculate the sample correlation between...

    Started by sweetx‎, 12-20-2006 11:15 PM
    • Replies: 3
    • Views: 2,408
    12-27-2006, 05:39 PM Go to last post
  43. Help needed for spatial statistics - linearity problem

    I am a final year Environmental Geoscience BSc student, currently engaged in a dissertation project on synsedimentary fracturing in carbonates. I...

    Started by Adibaba‎, 12-28-2006 05:59 AM
    • Replies: 0
    • Views: 1,718
    12-28-2006, 05:59 AM Go to last post
  44. statistics, pls help im stuck

    Question A major financical institution would like to predict its loan degault rate based on the interest rate it charges. A random sample of...

    Started by tameika‎, 12-27-2006 06:40 PM
    • Replies: 2
    • Views: 2,380
    12-29-2006, 11:25 AM Go to last post
  45. Comparing multiple catagories care progress

    I would like to track the success and progress of care given for a severly disabled child. Layout example I thought would be good. 1=poor...

    Started by Mobrien703‎, 12-29-2006 07:25 PM
    • Replies: 0
    • Views: 1,944
    12-29-2006, 07:25 PM Go to last post
  46. Which Statistical Methoded work best???

    I would like to track the success and progress of care given for a severly disabled child. Layout example I thought would be good. 1=poor...

    Started by Mobrien703‎, 12-29-2006 09:47 PM
    • Replies: 0
    • Views: 1,879
    12-29-2006, 09:47 PM Go to last post
  47. Independent samples T Test or Chi-Square

    Hello! I'm writing masters degree and cannot decide which method to use. :confused: Hypothesis 1:

    Started by ynos‎, 12-29-2006 12:40 PM
    • Replies: 3
    • Views: 5,177
    12-30-2006, 05:09 PM Go to last post
  48. Help! One-way within-subjects ANOVA & retrospective power analysis...

    Hey, I'd really appreciate any help you could give me on this. Basically, my design is w-s, one IV, 3 levels looking at word recall and...

    Started by Lisejane‎, 12-22-2006 11:44 AM
    • Replies: 1
    • Views: 3,413
    12-30-2006, 05:20 PM Go to last post
  49. Normal Distribution Help

    Question: The probability that a person has an unlisted telephone number is 0.15. The district manager of a political action group is phoning...

    Started by Bishop‎, 12-29-2006 05:02 PM
    • Replies: 2
    • Views: 2,598
    12-31-2006, 09:43 AM Go to last post
  50. Question How to detect 'secondary' correlations

    As part of a Phase I SBIR study, we ran some experiments using human subjects. Without bothering with the specifics, we had a group of people...

    Started by groston‎, 01-01-2007 03:31 PM
    • Replies: 0
    • Views: 1,969
    01-01-2007, 03:31 PM Go to last post
  51. Question Central limit theorem

    It's been years since I've taken a statistics course. I recall taking several of them. But, apparently I took them to little good effect, since a...

    Started by bmccarty‎, 01-02-2007 12:04 AM
    • Replies: 1
    • Views: 3,245
    01-02-2007, 12:22 AM Go to last post
  52. Hypothesis Testing Help

    I have read everything I can on hypothesis testing but I am struggling with this one question. I just need someone to explain it to me. Just where I...

    Started by statflyguy‎, 01-01-2007 04:03 PM
    • Replies: 1
    • Views: 2,797
    01-02-2007, 02:21 AM Go to last post
  53. Lightbulb Durbin Watson statistic

    Hi all, I would like to calculate DW critical values (up and down) for 5200 samples. I have got 3rd, 4th, 5th and 6th order polinomial equations....

    Started by mezgageza‎, 01-02-2007 10:45 AM
    • Replies: 1
    • Views: 4,587
    01-02-2007, 11:11 PM Go to last post
  54. Any help would be greatly appreciated

    I am desperate for help as my dissertation has to be handed in very soon and i am totally baffled with the data analysis section. I have carried...

    Started by gepworth‎, 01-02-2007 11:33 AM
    • Replies: 3
    • Views: 3,068
    01-03-2007, 05:58 AM Go to last post
  55. is there a way to type mathematical expressions in this forum?

    hi, Is there a way to type mathematical formulas - definite integrals, subscrips, superscripts, bars etc. in the posts? If yes, could you give an...

    Started by fencing‎, 01-02-2007 10:21 PM
    • Replies: 2
    • Views: 2,174
    01-04-2007, 11:44 AM Go to last post
  56. Finding Correllation B/W Education & Income

    So I've got this research assignment, on finding correlations. And I've found some data tables on Statscan for free. My thesis is that those of...

    Started by ///‎, 01-04-2007 04:09 PM
    • Replies: 0
    • Views: 2,597
    01-04-2007, 04:09 PM Go to last post
  57. Piecewise versus fitting to a distribution

    Question: When defining a set of data...is it "better" or more valid to use actual percentages within a set range or to fit the data to a...

    Started by Mrbrown878‎, 01-04-2007 05:09 PM
    • Replies: 0
    • Views: 2,695
    01-04-2007, 05:09 PM Go to last post
  58. Predicting Sales

    Hello All, I am new here just began my career after leaving college. I work at an ice arena as the concessions manager. I have a theory that...

    Started by codyConcessionaire‎, 01-05-2007 12:02 PM
    • Replies: 0
    • Views: 2,666
    01-05-2007, 12:02 PM Go to last post
  59. Normal Approximation to the Binomial Dist

    More than 200 billion grocery coupons are distributed each year for discounts exceeding $84 billion. However, according to a report in USA Today,...

    Started by Bishop‎, 01-02-2007 11:37 AM
    • Replies: 3
    • Views: 4,562
    01-06-2007, 02:38 AM Go to last post
  60. ANCOVA Power calculation?

    Hi. I would be very grateful if anyone could tell me how to do a power calculation for an Analysis of Covariance study design. I have Cohen's tables,...

    Started by jvh76‎, 01-06-2007 07:26 AM
    • Replies: 0
    • Views: 5,838
    01-06-2007, 07:26 AM Go to last post

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