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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: 196,824
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: 66,794
09-30-2005, 09:44 AM
1. ### Probability that sample mean is within the 1 unit of population mean?

Hello People, I am currently working on the following question: "A sample A is taken from the population. It is of size n1. Calculate the...

• Replies: 8
• Views: 14,939
11-13-2011, 05:42 PM
2. ### interpreting Kendall's W

Hello, first of all I want to say that this site is fantastic! I'm very glad I found a site that helps people with statistics problems. I hope you...

• Replies: 2
• Views: 14,931
02-27-2009, 05:22 AM
3. ### Deciphering linear, nonlinear and random relationships from scatter plots

Hello All!! This may sound not so bright and I hope none are too badly offended, but I can't for the life of me figure out if my hunches about...

• Replies: 4
• Views: 14,900
12-04-2008, 07:34 PM
4. ### 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: 14,871
10-11-2011, 10:43 AM
5. ### Fligner test vs Bartlett test for homoscedasticity

Hi all, I have an unexpected difference from the tests on homoscedasticity of the data performed with Fligner and Bartlett- In one case I get...

• Replies: 4
• Views: 14,829
06-10-2010, 11:29 AM
6. ### How to calculate composite scores?

Hi everyone, I know it's a bit embarassing to ask this question, but I hope someone can help :o I conducted a survey using four different...

• Replies: 2
• Views: 14,824
06-13-2008, 01:35 PM
7. ### Find standard deviation when there is no specific data

It is said, In order to profitably manufacture a product, you determine that you must have a scrap rate no greater than 5%. In other words, at...

• Replies: 5
• Views: 14,814
04-01-2012, 08:59 PM
8. ### derive R squared

For my econometrics class I have been asked to derive the R squared formula. Now I know the formula for R 2 1- sum of sq error/total sum of...

• Replies: 6
• Views: 14,809
10-04-2009, 07:24 PM
9. ### Non-significant Omnibus F with significant Post-hoc

In a 2x2 ANOVA with 2 levels for each of the IV's (example: gender-M/F and handedness-Left/Right): I get a non-significant omnibus F in a model...

• Replies: 9
• Views: 14,794
06-15-2010, 04:32 PM
10. ### Help with constructing a confidence interval

I'm taking an online stats class (probably a mistake but I'm going to make it). I have a question that I can't figure out because the help assistant...

• Replies: 2
• Views: 14,784
08-11-2008, 03:22 PM
11. ### How to combine single Likert items into one scale? (Time-sensitiv)

Hello, I have a very time-sensitive question: I am replicating a theory that uses 12 Likert items to measure three latent variables (4 items...

• Replies: 6
• Views: 14,730
07-31-2011, 02:24 PM
12. ### How to read F test table?

For the table http://www.stattools.net/FTest_Tab.php How do I read it? What is numerator degrees of freedom and denominator degrees of...

• Replies: 3
• Views: 14,667
02-15-2012, 01:41 PM
13. ### Assumption when using the mean and median

Hi, When I use the mean or the median on a set of data am I making any assumptions about the distribution of the data? Can I effectively use them...

• Replies: 2
• Views: 14,665
09-24-2009, 05:52 AM
14. ### Kruskal-Wallis test in SPSS

I have used The Kruskal-Wallis test to compare the performance on three groups of students. SPSS tells me that the null hypothesis can be rejected...

• Replies: 3
• Views: 14,637
04-29-2010, 06:05 PM
15. ### Post-hoc MANCOVA Tests in SPSS

Hi, SPSS won't allow me to run post-hoc tests on a MANOVA with covariates - how can I now interpret results following a significant Wilk's Lambda...

• Replies: 4
• Views: 14,621
08-17-2011, 01:26 PM
16. ### Fisher's Exact Test for determining correlation between variables

Hello all, My P.I. has presented me with a 2x2 contingency table and asked me to perform Fisher's Exact Test to determine whether a correlation...

• Replies: 14
• Views: 14,609
09-24-2012, 11:52 AM
17. ### linear by linear association test

I am having trouble finding what Linear by linear association tests are measuring. What do they mean?? I have one p-value that may be significant...

• Replies: 0
• Views: 14,588
10-22-2007, 12:24 PM
18. ### Mixed 2x2x2 ANOVA Advice

Hey guys, Just started a job as a research tech and part of job is statistical analyses and need your advice. I have analyzed this ANOVA but...

• Replies: 1
• Views: 14,569
04-15-2011, 08:14 AM

I’ve just picked up my thesis from a 3 year hiatus so things are (more than) a little rusty. I need some help with interpreting adjusted R squares. ...

• Replies: 4
• Views: 14,558
03-26-2011, 09:35 AM
20. ### Difference between one way ANOVA and within subjects ANOVA with one factor?

Hi there, Out of interest I set up tests to run both a between subjects one way ANOVA and a one factor, repeated measures ANOVA in SPSS. There...

• Replies: 2
• Views: 14,525
07-26-2010, 05:37 PM
21. ### T-test and large but unequal sample sizes

Hi, I'm working with a very large data set and would like to compare two independent populations. For the first population, I have approximately...

• Replies: 2
• Views: 14,499
04-05-2011, 04:03 PM
22. ### Presence/Absence data- test for differences between groups

Hello everyone, I want to figure out the differences in frequencies (presence) of heartwood rot in trees in three different zones. Each zone has...

• Replies: 6
• Views: 14,458
03-12-2012, 06:16 PM
23. ### Interpreting PERMANOVA interactions

I have a dataset from environmental dynamics of bacterial communities over time. My design has 3 factors: condition, year, and site. Condition and...

• Replies: 3
• Views: 14,439
11-24-2011, 03:13 PM
24. ### 15 Likert scale questions: How do I find the mean, median and mode?

Please Help! I need to find the mean the median and the mode and also use a t test to interpret my results between females and males in mate...

• Replies: 11
• Views: 14,412
12-18-2012, 03:03 AM
25. ### revisiting unbiased/biased sample variance/standard deviation

I am revisiting a question I have on the biased/unbiased nature of the sample standard deviation and variance. It was previously discussed in this...

• Replies: 3
• Views: 14,400
11-03-2008, 03:20 PM
26. ### Test of hypothesis at 2% level of significance

I would like to help answer this question: a mathematic journal recently reported the mean IQ of all statistics professors is at least 120. to test...

• Replies: 4
• Views: 14,381
08-05-2011, 01:17 PM
27. ### level of significance Calculator Problem

I need help with this question, Im studying for a test and this was an example problem. ( I already have the answers, im just trying to figure out...

• Replies: 3
• Views: 14,372
11-13-2008, 06:36 PM
28. ### How to transform non-normal data to normal

Hi! I want to compare the differences in the amount donated for charitable purposes between two demographic groups (I want to check for...

• Replies: 4
• Views: 14,365
09-09-2010, 02:11 PM
29. ### Measures of variability for very skewed data

Hi All, I've had a quick search through the forum and couldn't find an answer for this question, but I hope this isnt a repost anyway. As part...

• Replies: 3
• Views: 14,342
01-06-2010, 04:18 PM
30. ### Tukey table/chart

Can anyone help me with this? I'd like to carry out a Tukey test for comparing the mean of 27 samples (and the degree of freedom is 26)....

• Replies: 9
• Views: 14,325
07-11-2011, 06:00 PM
31. ### My first time with statistics - Chi Square help needed.

Hi guys, first post and first time EVER playing with statistics:eek: . I am looking for ways to summarise two sets of data I have collected. They...

• Replies: 1
• Views: 14,313
04-04-2008, 03:57 PM
32. ### how two nominal variables can correlate?

Hallo there, I do not understand how two nominal variables c.q. categories (c.q. non-numerical) can positively/negatively correlate with each other?...

• Replies: 6
• Views: 14,302
04-07-2009, 11:11 AM
33. ### How to prove the expectation and variance of a Continuous Uniform Distribution

Any help with these three questions would be very much appreciated: Consider a continuous random variable X from the Uniform distribution for x = ...

• Replies: 6
• Views: 14,270
08-03-2012, 02:03 AM
34. ### CHi square X2 to rule out differences between groups on demographics

Hi I was wondering if someone could please help me understand how Chi square helps me rule out differences between groups on the demographics of...

• Replies: 9
• Views: 14,174
03-08-2014, 09:14 PM
35. ### Relation between confidence interval, confidence level, and sample size

Hi I am penning down my theoretical understanding of confidence interval, confidence level, and sample size. Kindly let me know if this is correct...

• Replies: 1
• Views: 14,121
01-21-2011, 12:57 AM
36. ### Statistical Analysis that I can do with current data

Greetings folks! The issue: I have analysed the 61 patients' SNPs (Single Nucleotide Polymorphism). SNPs are just the variation in the nucleotide...

• Replies: 4
• Views: 14,044
02-26-2009, 03:09 AM
37. ### z table question

Hello everyone, I was hoping someone could shed some light on a question I have. A normal distribution with a mean of 80 and a standard...

• Replies: 5
• Views: 14,029
10-08-2008, 07:12 AM
38. ### Comparing distributions (Kolmogorov–Smirnov?)

I have two sets of data, S and T, both made up of people with a set of various attributes. S is much larger than T, and I would like to (a) draw a...

• Replies: 0
• Views: 14,029
07-22-2013, 11:24 AM
39. ### How important are the assumptions of ANOVA??

I am doing some research on the impact of retention harvesting on soil nutrients and have been told by someone at my work that I do not have to test...

• Replies: 2
• Views: 13,998
01-13-2011, 05:11 PM
40. ### 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. ...

• Replies: 7
• Views: 13,952
01-26-2009, 06:38 AM
41. ### Back to back stem and leaf plot

Hi, I am trying to compare 2 distributions and I like the idea of back to back stem and leaf plot. Anybody knows of a software that might do that?...

• Replies: 2
• Views: 13,886
12-22-2009, 11:36 PM
42. ### Chi˛

HI I don't understand something: Ex.: I have a question with a linkart scale: Are you agree with the following sentence I'm smart ! Not...

• Replies: 4
• Views: 13,883
10-09-2008, 10:44 AM
43. ### negative t-test value reported with a minus?

I know this is probably the easiest thing in the world to know, but I can't find the answer in any of my text books: when a t-test value is...

• Replies: 1
• Views: 13,883
04-13-2010, 10:57 AM
44. ### t test minimum sample size

hello i have a problem: i have to different expperiments yielding time values, the one done in triplicate the other in dublicate. now i wanted to do...

• Replies: 7
• Views: 13,859
05-04-2011, 08:43 PM
45. ### Two-way ANOVA and Tukey's HSD test

Hope someone can help me out... Is it acceptable to use Tukey's HSD test after estimating a two-way ANOVA randomized block design. All my stat...

• Replies: 1
• Views: 13,852
08-11-2009, 08:25 AM
46. ### Probability vs propensity

Hello, I like to think of myself as reasonably intelligent but this is a topic that I still haven't gotten my head around as many explanations...

• Replies: 4
• Views: 13,850
08-03-2010, 12:17 PM
47. ### A fundamental question!

First sorry for my first-grade English! If you are OK with it, please read on. Second, sorry that my question is so basic, but sometimes I see...

• Replies: 45
• Views: 13,839
01-25-2012, 05:57 AM
48. ### anova, Tukey post test, t test

HI all, and thanks in advance for any help you can give. I am analysing data coming out of genetic studies and have 5 groups to compare...

• Replies: 2
• Views: 13,797
08-04-2009, 12:05 PM
49. ### Calculating Test Statistic With Minitab

I am currently trying to solve a problem and am having great difficulty. It is a hypothesis test that asks if the population proportion is greater...

• Replies: 2
• Views: 13,788
11-05-2011, 06:27 AM
50. ### Margin of Error & Confidence Interval

Hi With increased confidence interval, confidence level increases - I understand this. However in Sampling, When we link confidence interval as...

• Replies: 3
• Views: 13,779
BGM
11-02-2011, 04:46 AM
51. ### Spearman's correlation: a continuous with a binary variable

Hi everyone. I'm pretty new to statistics so sorry for the dummy question :o I need some nonparametric statistics to correlate a binary variable...

• Replies: 9
• Views: 13,759
12-29-2013, 07:20 AM
52. ### Help with Pearson Correlation - PLEASE

I am still struggling with submitting my Thesis and Supervisor issues. I would appreciate some advice please. I have a sample size of 1089...

• Replies: 11
• Views: 13,717
12-12-2010, 01:59 AM
53. ### Help with quantitative/qualitative/discrete/continuous problem.

Hey Guys, I'm taking Statistics and am very confused. Even worse is that my textbook just confuses me more. I've got a problem set I've been...

• Replies: 1
• Views: 13,701
09-23-2008, 02:35 AM
54. ### ANOVA with unequal sample sizes

hello, I have a question about ANOVA. This is the output I received when testing the effect of 'opnop' on mmse1. opnop is divided in 4 groups,...

• Replies: 1
• Views: 13,674
02-01-2008, 02:54 PM

1. two samples from the same population both have M=84 and s^2=20, however one sample has n=10 and the other has n=20 scores. Both samples are used...

• Replies: 2
• Views: 13,637
11-12-2010, 04:06 PM

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