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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: 196,702
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: 66,727
09-30-2005, 09:44 AM
1. ### 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: 14,913
02-27-2009, 05:22 AM
2. ### Critical z value problem

Need help with this problem Assume that the data has a normal distribution and the number of observations is greater than fifty. Find the...

• Replies: 2
• Views: 8,192
02-15-2009, 10:35 AM
3. ### Nonparametric Stats

Why do the numbers 3,6, and 12 always appear in nonparametric stats?

• Replies: 2
• Views: 2,819
12-15-2008, 03:42 AM

In two - way ANOVA, why does the MS carry along the interaction effect in Model II, but not in Model I (i.e. why does the interaction effect (when it...

• Replies: 2
• Views: 2,693
12-18-2008, 03:42 PM
5. ### Basic t score question

Is it ok to have a t-score that is negative? If it is negative, when looking at the t score table do I look at the number as a positive? Thanks

• Replies: 2
• Views: 20,246
12-18-2008, 10:05 PM
6. ### Sample size for normality tests and transforming data to normal distribution

hey, im trying to transform a set of biological count data (not normally distributed) into a normal distribution. The data is all similar to the...

• Replies: 2
• Views: 5,847
12-22-2008, 12:01 AM
7. ### Non Parametric alternative to a Mixed Measures ANOVA

Hi All, I am wondering if you can help me out with a problem i am having. Firstly, i have a single between subjects IV (gender) and then two...

• Replies: 2
• Views: 24,255
12-31-2008, 02:09 AM
8. ### LSDs when you can't do ANOVA?

I have a bizarre question, and curious about what other people think. Bear with a bit of an explanation here. My understanding is, if you do a one...

• Replies: 2
• Views: 2,541
01-04-2009, 11:19 AM
9. ### Testing a hypothesis

Hi I think I'm in trouble with a quite simple hypothesis testing. The question is: A company claim that their employees handle 40 orders per...

• Replies: 2
• Views: 2,011
01-07-2009, 03:24 AM
10. ### SPSS Post Hoc Tests

Hi all Stats enthusiasts! This is my first time as a new user to TalkStats and I'm really excited to get some of your opinions and help. I use...

• Replies: 2
• Views: 4,826
01-07-2009, 03:27 AM
11. ### variance and covariance need to clarify!

Hi, There is an example in an article where the author calculates variance and covariance, but I can't understand how (I'm novice in the topic). The...

• Replies: 2
• Views: 2,803
01-11-2009, 01:12 PM
12. ### Please need urgent help regarding t-test

We have a research wherein we need to determine the significant different between the entry and exit assessment. So we utilized the t-test. we were...

• Replies: 2
• Views: 1,948
01-12-2009, 12:03 PM
13. ### Method for identification of identical time series needed

I am looking for a solution to the following problem: There is a pool of about 150 different time series. Each series contains default...

• Replies: 2
• Views: 2,562
01-12-2009, 11:55 AM
14. ### Proper Statistics Test

This is a problem I ran across at my job. I have ABSOLUTELY no statistics experience so that might explain if this problem is exceedingly simple: ...

• Replies: 2
• Views: 2,751
Axl
01-28-2009, 03:29 PM
15. ### Autocorrelation with S-Plus

Hi, I have a series of data organized by location (x) and test value (y). I want to make an autocorrelation function for those data using S-Plus. Is...

• Replies: 2
• Views: 3,584
01-23-2009, 10:33 PM
16. ### Help on explaining Conflicting F test and t test results!

Could someone please explain to me how an F test could lead to an insignificant result while a t test lead to significant results. I know the...

• Replies: 2
• Views: 6,057
01-16-2009, 10:20 AM
17. ### showing p-value

Hello: It has been a while since I visited the forum. I have a problem I would like some input on if anyone is so minded. Suppose a researcher...

• Replies: 2
• Views: 1,657
01-19-2009, 08:09 PM
18. ### HELP:: Meaning of LOD score in Genetics Testing

First, a little bit about how a LOD score is calculated. What you basically do is take the probability of a set of events happening if there is no...

• Replies: 2
• Views: 5,531
01-21-2009, 01:36 PM
19. ### What are the most important approaches to statistical decision?

So far, the criteria of statistical decision I have committed myself to learning are: maximum expected utility, maximum utility under most probable...

• Replies: 2
• Views: 2,309
01-21-2009, 12:48 AM
20. ### new to stat.. likert scale and ttest

hi, i really need help.. how do i analyze the result of a likert scale? i am using a 5pt likert scale and my questions are categorized and each...

• Replies: 2
• Views: 2,630
01-22-2009, 05:22 PM
21. ### Repeated Measures - unequal time points across groups

Hi everyone, I need to compare two groups. Group 1 will take drug X for 12 months and Group 2 will take drug X for 8 months. They will be given...

• Replies: 2
• Views: 4,183
01-22-2009, 08:44 PM
22. ### frequency table for histogram

im taking an online statistics course and im stuck. can anyone help?? the chart for the problem is this: DS1 Gender Monthly Income Education...

• Replies: 2
• Views: 2,915
01-27-2009, 07:29 AM
23. ### validity of correlation

Hi, I'm hoping someone can help me with a problem with correlations I've encountered with my research. I use an instrument that gives out 4...

• Replies: 2
• Views: 2,803
01-27-2009, 01:16 AM
24. ### Serial correlation

I executed a regression by using Eviews, the DW stats were about 0.25. It means the presence of serial correlation in errors. Could someone help me...

• Replies: 2
• Views: 2,098
02-01-2009, 07:16 AM
25. ### Statistical tests for non-normal population

Hello everyone, My name is Jesse. My background is in pure mathematics and computer science (i.e., lots of discrete math) so statistics falls...

• Replies: 2
• Views: 5,404
01-31-2009, 06:46 PM
26. ### What test to use?

Hi I'm doing experiement on the usage of system I deploy. 107 users involve. In the experiment I monitor a usage on the features provided on:...

• Replies: 2
• Views: 1,861
nma
02-04-2009, 04:51 PM
27. ### Just a wee question..

Hello!! I am stuck! Stats has never been my strong point, but I have mangaged to get a few tests done using minitab! so fingers crossed that they...

• Replies: 2
• Views: 1,708
02-05-2009, 08:59 AM
28. ### T test/Hypothesis testing homework, NEED help understanding this steps!!

:shakeheadThis is the assignment I am having difficulty with. I do not simply want the answers, I really want to understand how to do this. It's...

• Replies: 2
• Views: 5,955
02-03-2009, 03:06 PM
29. ### nonparametric equivalent for a between subjects ANOVA

Hello, I am currently conducting analysis for a 2x2 independent ANOVA with each independent variable having two levels. I need to conduct a...

• Replies: 2
• Views: 6,704
02-04-2009, 02:21 PM
30. ### Confused Again

I have to give it in N(mean, standard deviation). I don't even know where to start :(. Maybe I have to compare the percentages and the months to...

• Replies: 2
• Views: 2,880
02-05-2009, 06:55 AM
31. ### What's the initial value of a(t) in a SARMA models

Hello,Guys: I've fitted the data into a S-ARIMA(p,d,q)*(P,D,Q) models using R. Where p=1,d=0,q=1; P=0,D=1,Q=1; and the seasonal period S=45. ...

• Replies: 2
• Views: 2,603
02-11-2009, 10:27 PM
32. ### Understanding the equation to calculate variation

Hello, I am confused by the equation used to obtain variation. summation of: ((X-bar - Xi)^2)/(n-1) Why do we divide by n-1 and not n? ...

• Replies: 2
• Views: 5,140
02-09-2009, 10:24 AM
33. ### Comparing two groups of percentages

Hello! First a bit of background: I am trying to compare the performance of two groups of people (A and B) on various simple tasks that require...

• Replies: 2
• Views: 8,944
02-12-2009, 05:01 AM
34. ### Confidence Interval Gamma Dist

Does anyone knows the equation for the Confidence Interval of a Gamma Distribution?

• Replies: 2
• Views: 6,625
02-16-2009, 01:20 PM
35. ### Interpreting Mann Whitney in VASSAR

Hi, I was wondering if somebody could please help me with interpreting the output of Mann Whitney in VASSAR, as I am used to using SPSS, and the...

• Replies: 2
• Views: 2,844
02-20-2009, 01:50 AM
36. ### Intra oberservation

Hi there, I am have measured 100 different things 3 times each and got different measurements each time. I have tried to research intra...

• Replies: 2
• Views: 2,742
02-20-2009, 10:47 AM
37. ### Interaction Effect

Hi, I am using a 2 x 2 WS Anova. Here's some background Info- IV #1 - 2 levels IV # 2 - 2 levels DV - response time Main effect of IV 1 -...

• Replies: 2
• Views: 2,547
02-20-2009, 02:06 PM
38. ### 2-way ANOVA variable problem..

Hi, if anybody has any suggestions please let me know, myself and my dissertation partner cannot figure this out! So, we have two independent groups...

• Replies: 2
• Views: 2,098
02-23-2009, 05:56 AM
39. ### graphs to represent data

Hello, I have IQ scores for 2 matched-sample groups (exposure to stimulating music before the testing and no exposure) and the n for each group is...

• Replies: 2
• Views: 2,279
02-24-2009, 01:30 AM
40. ### Likert data question

I am a student who has administered an attitude survey on a 5-point Likert scale to students at two different colleges in the same sport. First, I...

• Replies: 2
• Views: 3,404
02-26-2009, 04:16 AM
41. ### Probabilities...need help

A student government states that 80% of all favor an increase in student sample to subsidize a new recreational area. a random sample of n=25...

• Replies: 2
• Views: 2,808
02-24-2009, 06:04 AM
42. ### New to Stats - normal distribution question

Hi all, I am analysing some data. I have collected data from 15 subjects, giving a preference score for how good a piece of music sounds in a...

• Replies: 2
• Views: 3,126
02-26-2009, 10:26 PM
43. ### Normal Distribution help please

Hello, I am stuck with how to create a table/graph for the following problem: According to Investment Digest ("Diversification and the...

• Replies: 2
• Views: 3,105
03-16-2009, 11:50 AM
44. ### probability..i think i have the right idea..help

The avg lenght of time required to complete a college acheivment test was found to be equal 70 min with a standard diviation of 12 min. when should...

• Replies: 2
• Views: 2,094
03-01-2009, 11:35 PM
45. ### comparing different sample sizes

I need to carry out an independent samples t-test, but the samples are of different sizes (12 & 14), do I need to carry out a non parametric...

• Replies: 2
• Views: 8,152
03-02-2009, 03:46 PM
46. ### Proving statistically beyond a reasonable doubt?

If I toss a 12-sided die 112 times, what are the chances of any number coming up 32 times... and any number not coming up at all? Can we assume...

• Replies: 2
• Views: 3,498
03-04-2009, 12:15 AM
47. ### Factor Analysis - eigenvalues

I was just wondering whether it is true that factor values are the eigenvalues of the factors? Thanks very much for your help!

• Replies: 2
• Views: 3,997
03-04-2009, 12:31 PM
48. ### Im stuck on confidence interval

:( Please help. Im trying to figure this out and no go. Q: A pharmaceutical company analyses a specimen from each batch of pain reliever to verify...

• Replies: 2
• Views: 1,668
03-06-2009, 10:27 AM
49. ### Excel Help

So, I miss one day of class to go visit my fiance's AF recruiter and now I'm behind two homework assignments. I've got a professor who doesn't really...

• Replies: 2
• Views: 2,825
03-07-2009, 12:44 PM
50. ### This is horrible I have no clue what I'm doing I'm going to fail everything ever

..........

• Replies: 2
• Views: 2,200
03-07-2009, 07:23 PM
51. ### regression on censored data

Hi everyone. I am trying to do statistical analysis on censored data. I have paired data: for each stream flow measurement I have a bacteria count...

• Replies: 2
• Views: 2,673
03-11-2009, 05:50 PM
52. ### help with critical value approach

hi all, having a problem with my stats assignment, using critcal value approach, conduct an appropriate test at significantt level of 0.05 to...

• Replies: 2
• Views: 3,342
03-14-2009, 09:23 PM
53. ### Advantages to using Ratios

• Replies: 2
• Views: 6,177
03-15-2009, 10:19 AM
54. ### Rounding in statistics

I am pretty new to statistics and I keep making silly mistakes with the rounding rules. I have been asked to round a few numbers off to 2 decimal...

• Replies: 2
• Views: 3,186
03-19-2009, 01:34 AM

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