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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### 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...

• Replies: 1
• Views: 197,007
07-16-2014, 11:01 AM
2. ### 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)...

• Replies: 0
• Views: 66,879
09-30-2005, 09:44 AM
1. ### Regression analysis with a proportion for the dependent variable

Hi, i want to run a regression analysis for some data I have. The dependent variable is a proportion, and the independent variables are all...

• Replies: 9
• Views: 33,199
04-30-2012, 04:05 AM
2. ### List of recommended stats books

Stats novice here but enthusiast. What would be a list of books you would expect any BS in statistics to have. I have my list culled from uiuc's...

• Replies: 9
• Views: 12,409
01-16-2012, 02:10 PM
3. ### what shall I learn in order to understand logit models?

Hello, I am an accounting student. i only did a unit in statistics covering basic topics such as basic probability, discrete probability...

• Replies: 9
• Views: 4,144
07-19-2011, 02:54 AM
4. ### Simpson's diversity index - comparing 2 sites

I need to compare the Simpson's Diveristy Index of 2 sites. For each site I have collected beetles using pitfall traps - 20 traps per site. Using...

• Replies: 9
• Views: 18,489
07-21-2011, 12:47 AM
5. ### Test for multiple means in a dataset

In a dataset of arbitrary size what type of test could I apply to say with confidence that there are actually multiple smaller datasets present? ...

• Replies: 9
• Views: 4,386
08-01-2011, 06:00 PM
6. ### Seems simple but I don't remember how to solve?

Given a normal distribution with a mean of 100 and a standard deviation of 10, what is the probability that X > 112?

• Replies: 9
• Views: 3,446
08-07-2011, 12:06 AM
7. ### Intepretation of regression estimates based on data from census

I'm a bit curious about how to interpret confidence intervals of parameter estimates that comes from regression models (multiple regression and...

• Replies: 9
• Views: 6,718
08-10-2011, 02:34 PM
8. ### Comments on Distribution of Data

I would want to know how to give proper comments on the spread of data through the use of graph and frequency polygon. I have done some search before...

• Replies: 9
• Views: 3,772
09-01-2011, 05:55 PM
9. ### Real life question, probably very basic, but not sure where to start

I'm working with some data sets ... let's call it variable "A", a lab result, vs time in days. I think A decreases with time, and would like to...

• Replies: 9
• Views: 2,007
09-08-2011, 02:05 PM
10. ### Pretest-Posttest Data Analysis....Help needed urgently

My research topic is based on comparison of the Effects of Traditional and Modern teaching techniques on Students’ Attitude and Achievement in...

• Replies: 9
• Views: 14,899
10-11-2011, 10:43 AM
11. ### t-distibution simulation

How might one calculate the probability P(X<=x) drawn from 10,000 t-random numbers? This may involve utilizing computing software, but I'm more...

• Replies: 9
• Views: 2,683
10-02-2011, 02:39 PM
12. ### Chi square help

Hi I have a variable x which could have been given a value between 1 and 30 by 189 people. Running chi square suggests that the results are not due...

• Replies: 9
• Views: 4,271
11-02-2011, 04:41 AM
13. ### estimating non-truncated parameters (source distribution) from truncated data

Hi all, I have a question regarding ‘truncated’ data. Say, for example, I’m making buttons with a certain thickness, and the process gives a...

• Replies: 9
• Views: 6,127
11-16-2011, 02:35 PM
14. ### sample size unequal probabiity

how do you decide what n should be for a survey with unequal probability selection if you specify a margin of error of 3 percent? im interested in...

• Replies: 9
• Views: 2,211
12-03-2011, 03:42 AM
15. ### Sequential AIC model selection

Hi there, when running a model selection using AIC, am I allowed to do sequential AIC model selections? Example: I have a dependent variable (X)...

• Replies: 9
• Views: 6,848
12-14-2011, 12:10 PM
16. ### 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...

• Replies: 9
• Views: 54,776
12-15-2011, 02:15 PM
17. ### The importance of calculus and matrix/linear algebra in understanding statistics

Hey all, I'm currently in a stats class that teaches the course (right now with a focus on correlation and linear regression) in a very...

• Replies: 9
• Views: 8,044
02-08-2012, 12:03 AM
18. ### One question reliability... have you ever heard of?

Hi I know this may seems silly to ask about but I have to !! I want to know if there is something like checking the reliability of just one...

• Replies: 9
• Views: 2,693
02-10-2012, 09:46 AM
19. ### Does having too many variables in a regression affect the R^2 result?

Right now I have 1 variable that I need to predict the outcome of and 18 possible independent variables. When I ran the analysis, the R^2 value was...

• Replies: 9
• Views: 9,235
02-15-2012, 02:00 PM
20. ### Non-normality persisting after various transformations

Hi, I am using SPSS18. I am comparing a psychological treatment (n=26) to a control (n=32), but at the moment I'm still doing data cleaning and...

• Replies: 9
• Views: 2,413
02-23-2012, 12:12 AM
21. ### Theory testing

Hi guys (First Post, woop!) Im currently attempting to draft a PhD proposal investigating the role of optimism in Seligman's Well Being Theory but...

• Replies: 9
• Views: 1,877
03-06-2012, 02:06 PM
22. ### Really Basic A level Statistics Test. (Multiple Choice)

1) ‘Cluster sampling’ is a term given to one method of (a) Selecting random numbers using excel (b) Probabilistic sample selection...

• Replies: 9
• Views: 6,345
03-08-2012, 04:01 AM
23. ### How to check association between an interval variable & nominal variable?

There is a collection of data of 2000 patients. I want to know the age of onset of Diabetes (an interval variable) has any relationship to the...

• Replies: 9
• Views: 7,334
12-06-2012, 07:30 PM
24. ### Kmeans clustering

Every time I run the same calculation with the same number of cluster setting, I got different members in the cluster. What is the most reasonable...

• Replies: 9
• Views: 2,417
03-22-2012, 04:50 AM
25. ### single-case study

Dear friends, I am running a single case study. I am collecting correct and incorrect responses on two similar tests in 3 moments in time. I would...

• Replies: 9
• Views: 4,110
05-05-2012, 09:49 AM
26. ### Yes/No Questionnaire Analysis

Hey all. I'm having issues trying to figure out how to record and analyze some data I've collected. Here's the short story: 8 kids took before and...

• Replies: 9
• Views: 16,998
05-08-2012, 05:36 PM
27. ### The wheat and chessboard problem

So I'm watching the tv show Numbers and they ask a problem called the Wheat Chessboard Problem which basically says: (see this wiki link about...

• Replies: 9
• Views: 5,933
05-22-2012, 01:43 PM
28. ### Qualitative understanding of Logistic Regression

I've been thinking hard about logistic regression, and I'm having some difficulty with the notion of "odds ratio" here. For each factor, I get an...

• Replies: 9
• Views: 1,687
05-25-2012, 12:46 PM
29. ### Sample coefficient of correlation

Okay, suppose that I have n pairs of (Xi,Yi) of random variables X and Y. Between these n pairs of values (Xi,Yi), I am given the information that...

• Replies: 9
• Views: 3,208
08-07-2012, 11:56 AM
30. ### Correcting unbalanced design

I have ten replicates (bird's nests) that I have observed and made counts of the food that is going into the nests using cctv cameras. Unfortunately...

• Replies: 9
• Views: 2,614
08-06-2012, 05:32 PM
31. ### Permanova with covariate

Dear all, I have designed a permanova analysis with covariate. It is a 1factorial design 1 Factor: Site (6 levels). 1 Covariate (Algal...

• Replies: 9
• Views: 5,411
08-22-2012, 04:23 PM
32. ### Help on results interpretation plz.

Hi all So I finally found out how to do what I wanted in SPSS in terms of tests but now I just wanted to check I was interpreting the data...

• Replies: 9
• Views: 2,637
08-23-2012, 05:45 AM
33. ### ANOVA terminology

I am reviewing for comps and I am confused about the difference between a factorial and crossed design. In both cases they appear to have each level...

• Replies: 9
• Views: 1,437
08-22-2012, 04:15 PM
34. ### 2 groups with ratio(s); How to test between-/within-group differences?

Hi statistics community I am wondering if anyone could please give me advice on my rather simple (I assume) statistical problem. I am working...

• Replies: 9
• Views: 3,308
08-31-2012, 02:38 PM
35. ### Sample Size.. to generalize sample out to the population

Hi all, Here, I ask your advise to overcome this, currently, I am working on master research, the aim of the research is to study the users...

• Replies: 9
• Views: 8,889
08-29-2012, 12:53 AM
36. ### Regarding supremum

Hi guys, I hope everyone's been doing well. I have a quick question. Figured someone could answer without much effort. I know that with...

• Replies: 9
• Views: 1,886
09-28-2012, 12:45 AM
37. ### Skewness and non-normally distributed data - Question.

Hello everyone, this is actually my first post as I have just discovered this amazing forum for talking about statistics. I've read through the...

• Replies: 9
• Views: 4,148
10-21-2012, 09:01 PM
38. ### Confusing Sampling Distribution Problem

Ok, I was understanding how to work sampling distribution problems until I came to this one, and I cannot figure out how to do it for the life of me:...

• Replies: 9
• Views: 5,204
10-31-2012, 09:20 PM
39. ### Distributions of random variables

I have been sweating over these problems for 4 hours - can someone please help? Let Z1,...,Zn be identically independently distributed ~N(0,1)...

• Replies: 9
• Views: 1,884
10-18-2012, 01:24 PM
40. ### not sure of statistical test, probably some kind of ANOVA

Hi all, I am not sure how to proceed given my data. I would appreciate if anyone could suggest a design. I tested the acceleration responses...

• Replies: 9
• Views: 1,765
11-27-2012, 09:23 PM
41. ### Show that a sample size is too small for reliable results?

Hi, I have a simple question about sample sizes I was hoping someone could help me with: A test subject drinks from 4 different glasses of water...

• Replies: 9
• Views: 3,363
11-21-2012, 02:05 PM
42. ### 4 continuous IVs predicting a single binary DV

Like the title says... I have 4 continuous IVs, whose combined effects (i.e. interactions possible) should predict a binary DV (possible values 1...

• Replies: 9
• Views: 2,021
12-14-2012, 07:44 PM
43. ### When is the distribution abnormal, judging from the mean, median and modus?

I have a poll data table with which be filled with between two and six thousand entries (one entry contains some 30 data). It is a table in SQL, a...

• Replies: 9
• Views: 2,468
05-02-2013, 05:30 AM
44. ### Chi-Square and Uniform distributions: Where are they prevalent?

Hey all. I'm in a pinch on a study and am needing to track down a source which will help me to identify in what areas of research data are organized...

• Replies: 9
• Views: 3,381
12-28-2012, 01:34 PM
45. ### Any suggestions?

I am using Systat 13.1 to predict the influence of tobacco use on blood flow. Tobacco use is an independent binary variable (1,0, yes/no) and blood...

• Replies: 9
• Views: 1,123
12-31-2012, 03:23 PM
46. ### Compare 2 lists for statistical significance , which test to select ?

I have 2 lists, a list that bought books and a list of readers that read those books. The lists are not coming from the same population . So the...

• Replies: 9
• Views: 3,953
01-02-2013, 09:16 AM
47. ### confused on which statistic test to use for a Questionnaire

Hi I was wondering if any one could help me with which statistical test to use for my dissertation. Basically i have conducted a questionnaire using...

• Replies: 9
• Views: 1,896
04-04-2013, 04:10 AM
48. ### Unequal sample sizes?

Hi, what do you have to consider when using unequal sample sizes? How does it differ from using equal sizes? As an example, I have Group 1:...

• Replies: 9
• Views: 4,886
04-15-2013, 10:38 AM
49. ### 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...

• Replies: 9
• Views: 9,525
05-11-2013, 02:33 PM
50. ### Estimate the unknown parameters

How we could estimate the parameters of non-linear combination of Normal Distribution Random Variables? Thank you

• Replies: 9
• Views: 1,799
BGM
06-17-2013, 12:01 PM
51. ### Null Hypothesis Rules: Can no difference be the alternative hypothesis?

For his dissertation a colleague has developed a software tool and has the expectation (hypothesis) that people can complete the task with the...

• Replies: 9
• Views: 3,342
06-19-2013, 09:30 AM
52. ### Interpreting sensitivity and specificity with corresponding PPV and NPV

Hello, I have calculated sensitivities, specificities with pos and neg predictive values for different cutoff values of two biomarkers. What i...

• Replies: 9
• Views: 3,531
08-15-2013, 02:43 PM

Suppose you wish to test the following hypotheses: Ho: p <= 0.25 and Ha: p > 0.25. If the proportion observed in a random sample of 100 items...

• Replies: 9
• Views: 2,693
09-04-2013, 03:33 PM
54. ### Confidence level vs Confidence Interval

I am getting really confused on the confidence level/confidence interval distinction. Most examples I see on the net pair off a 95% confidence...

• Replies: 9
• Views: 4,502
BGM
09-12-2013, 12:59 PM

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