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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: 197,043
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: 66,898
09-30-2005, 09:44 AM
1. ### What is Orthogonal contrast?

Whats the difference between your regular contrast and orthogonal contrast? Google search gives me to research papers that are beyond me. My notes...

• Replies: 2
• Views: 31,309
07-16-2012, 11:21 PM
2. ### H0: μ≥18.1 ,H1: μ<18.1, x̄ = 16.8 , s = 4.7?

Given that level of significance is 0.1, how do I A)find sample size( not sure if i need to find this but i think i do,im really confused on how...

• Replies: 1
• Views: 31,233
07-21-2010, 03:28 PM
3. ### Variance of product of two random variables

Hi, I want to find the variance of the product of two random variables normally distributed with common mean and variance. X, Y normally...

• Replies: 2
• Views: 30,958
10-04-2008, 06:04 AM
4. ### Finding a P-value

The questions: Use technology to find the P-value for a right-tailed test with n=26 and test statistic t=1.219 Use technology to find the...

• Replies: 3
• Views: 30,955
08-11-2008, 09:53 PM
5. ### Why regression estimate for dummy coded variable exceeds “1”?

Hi, I’m puzzled about interpreting one category of a multinomial regression analysis which shows “male” with an estimate of 1.47. I don’t...

• Replies: 4
• Views: 30,606
02-02-2012, 02:48 PM
6. ### Factor Analysis/Prinicpal Component Analysis: Reporting to APA Style

Hello All, Desperate for help! I've performed a principal component analysis on a pilot study of a questionnaire I created. I have removed poor...

• Replies: 1
• Views: 30,557
02-12-2008, 03:16 PM
7. ### Bêta and Alpha ...

Hi, I'm reading a paper and I find this in the Statistical Analyses section: Before initiating the study, a sample size was calculated...

• Replies: 1
• Views: 30,408
02-12-2009, 01:26 PM
8. ### Reporting results of Tukey-Kramer posthoc test

My question is probably not the typical query this forum receives, but hopefully there are some researchers on here who can help me. I actually...

• Replies: 3
• Views: 30,351
02-07-2011, 05:08 PM
9. ### Questions about Tukey's HSD/Scheffe Test

I heard Tukey Test can be used for unequal sample sizes. My assumption is that you must use some kind of weighted average of n for all groups....

• Replies: 7
• Views: 30,255
05-12-2008, 06:14 PM
10. ### Kurtosis - Example to calculate, Help Please!

Ok, hope people have PATIENCE with me here...I am doing some stat calculations, but I am NOT a statistician, so please bear with me. Please don't...

• Replies: 5
• Views: 30,214
01-03-2013, 01:25 PM
11. ### Z-score for Skewness and Kurtosis

Hi, I have a sample of data (about a hundred numbers) and I would like to roughly estimate whether they follow a normal distribution or not. From...

• Replies: 3
• Views: 30,207
08-10-2006, 11:46 PM
12. ### Fisher's Exact test in SPSS - help please?

Dear All, I am currently trying to do Fisher's exact tests on SPSS V20 as I had been advised this is correct test to undertake. What I am trying...

• Replies: 3
• Views: 29,800
05-30-2012, 03:37 PM
13. ### Decile equation?

Hello, I'm currently enrolled in Stats at the local university. Our book doesn't really do a good job at explaining how to figure Deciles, other...

• Replies: 5
• Views: 29,238
09-10-2008, 10:49 PM
14. ### Building a QQ plot manually in excel

Dear All, I have the following information: Observations *** Frequency YYY Cum Freq ZZZ Expected Cum Freq ??? (Total...

• Replies: 1
• Views: 29,237
08-13-2009, 11:04 AM
15. ### age is scale data in spss BUT what if the ages are grouped??? is it then ordinal?

Hi, I know that age is a scale measurement in spss but if i have ages that are groupef for example; 1= <20 2=21-30 3=31-40 4= > 40 is...

• Replies: 1
• Views: 28,989
03-27-2011, 08:34 AM
16. ### Identifying outliers in non-normally distributed data

Hello, I've been searching for a method for identify outliers for quite some time now. The complication is that I cannot assume that my data is...

• Replies: 4
• Views: 28,966
12-27-2009, 04:54 PM
17. ### Least Significant Difference, Calculate in Excel?

Anyone know how to figure out this enigma? I've looked at formulas for Least Significant Difference (LSD), and I can't seem to figure out how to...

• Replies: 0
• Views: 28,927
03-13-2008, 07:14 PM
18. ### Are chi squred tests always 1-tailed or 2 tailed?

Suppose we wanted to test whether 2 categorical variables are related as folllows: H0: The two variables are not related HA: The two variables ARE...

• Replies: 4
• Views: 28,892
11-11-2010, 07:35 PM
19. ### Standard deviation with only a mean and a percentage value.

I ask alot of questions on here and I hope not to annoy. Since my questions deal with obscure problems hopefully it will make it so others don't have...

• Replies: 5
• Views: 28,827
06-06-2012, 11:58 AM
20. ### Making sense of Chi-square and Cramer's V

I read a lot about chi-square tests that do not ever talk about Cramer's V (or comparable stat), but if I'm understanding correctly, it seems like a...

• Replies: 1
• Views: 28,825
05-27-2009, 09:04 PM
21. ### Comparing two values for significance

Looking for a little assistance please. I need to determine whether or not there is a statistical significant difference (p<0.05, with CI of 95%)...

• Replies: 4
• Views: 28,786
03-14-2010, 01:19 PM
22. ### Goodness of Fit , R squared or Chi squared?

Hello all, Having a bit of difficulty understanding when to use or which to use to give a quantative analysis for a goodness of fit measure on...

• Replies: 2
• Views: 28,740
11-17-2010, 02:21 PM
23. ### Difference between within-subjects effects, and within-subjects contrasts?

I've run a repeated measures ANOVA of some data, looking at the change in an outcome measure in 10 subjects outcome over time. SPSS tells me that...

• Replies: 3
• Views: 28,649
10-08-2008, 01:38 PM
24. ### Confidence interval for median

The question is: A traffic warden notes the time cars have been illegally parked after their metered time has expired. For 16 offending cars...

• Replies: 9
• Views: 28,614
10-12-2010, 09:58 AM
25. ### Find the P-value for the indicated hypothesis test.

A medical school claims that more than 28% of its students plan to go into general practice. It is found that among a random sample of 130 of the...

• Replies: 0
• Views: 28,594
09-23-2007, 02:50 PM
26. ### Kruskal-Wallis and multiple comparisons

Hello all, I've run a Kruskal-Wallis analysis (in SAS) and found there is a significant difference between the groups. Therefore, I would like to...

• Replies: 4
• Views: 28,581
06-02-2009, 11:56 PM
27. ### Normal Distribution Overlap

Is there a way that I can calculate the probability that a data point would fall in the region where two normal distributions with different means...

• Replies: 17
• Views: 28,354
07-18-2017, 02:24 AM
28. ### Factor Analysis-Why Rotation Failed?

Hello, I try to perform factor analysis using SPSS, varimax. But the Rotation failed and come up this message: "Rotation failed to converge in...

• Replies: 3
• Views: 27,964
03-22-2012, 01:36 PM
29. ### Chi Squared for Ordinal level Data ??

Hi all Please could someone explain to me in what circumstances you can use Chi squared with ORDINAL level data? I have collected data which...

• Replies: 6
• Views: 27,319
08-24-2012, 02:11 AM
30. ### Calculate the exact P-Value for an F-Test by hand

Does anyone know the algorithm, formula, or procedure to calculate the exact p-value for an F-test by hand? I already know how to find out what...

• Replies: 2
• Views: 27,142
09-07-2011, 09:38 PM
31. ### Best fit, standard deviation, and R2

Hi, I am wondering if someone can help me with a fairly basic question. I am looking at whether power, linear, or exponential curves fit a set of...

• Replies: 3
• Views: 27,117
02-19-2013, 03:11 PM
32. ### Repeated measures design, DF or n - 1 or n - 2

I know that, for an independent measures design the df is n - 2. But what about for a repeated measures design? I am guessing n - 1 but not exactly...

• Replies: 3
• Views: 27,025
03-17-2010, 12:52 PM
33. ### (Binominal proportions) confidence interval – which formula to use?

Hey, I got a quick question regarding confidence intervals. For a Rasch analysis I have to perform independent t-tests (it’s done to check for...

• Replies: 2
• Views: 26,902
11-12-2012, 06:30 AM
34. ### Standard error of the sample standard deviation

Hi, all Does anyone let me know the formula for "the standard error of the sample standard deviation" when no specific distribution is assumed for...

• Replies: 5
• Views: 26,781
06-10-2010, 08:50 PM
35. ### converting standard error (regression coefficient) to standard deviation.

Hi guys, I have a regression output where I'm given the standard error of both the intercept and the gradient (X co-efficient). I'm required to...

• Replies: 5
• Views: 26,640
10-28-2010, 06:04 PM
36. ### Prove var(s^2) = 2sigma^4/(n-1)

I am trying to prove var(s^2) = 2sigma^4/(n-1) for N(u, sigma^2) where S^2= sumof(xi-xbar)^2/(n-1) I tried var(s^2) = E - E^2 I have already...

• Replies: 5
• Views: 26,315
02-01-2011, 09:26 PM
37. ### Need help in excel with right tail??

Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead. Exceptions are...

• Replies: 11
• Views: 26,306
08-21-2008, 12:59 PM
38. ### Autocorrelation Function: How to interpret an acf plot?

Hi there, I'm trying to understand how to interpret an autocorrelation function plot. I've been trying to find resources that explain how they are...

• Replies: 0
• Views: 26,292
05-31-2011, 06:07 AM
39. ### Logistic Regression - How to interpret a Exp(b)= 0

Hi all, I'm working on a project and keep getting caught up with how to interpret my results. I've found lots of info on how to interpret...

• Replies: 32
• Views: 26,089
05-03-2013, 04:45 AM
40. ### interpretation of t-test result

Hi, could you please take a look at the image below and explain for me what the followings mean? 1. hypothesized mean difference 2. t-stat...

• Replies: 1
• Views: 25,918
03-08-2009, 01:27 PM
41. ### Rates vs Percentage

What is the rule of thumb for when to report a rate vs. a percentage? For example, if you want to show trends from year to year in the...

• Replies: 1
• Views: 25,915
09-09-2010, 12:49 PM
42. ### Residuals v.s errors

What is the difference between a residual and an error? Is it wrong to say an error is the difference between the data points and a fitted line...

• Replies: 3
• Views: 25,888
09-28-2011, 12:56 PM
43. ### Mean of residuals = 0

Hey im having trouble proving the mean of the residuals must always be zero. Can someone help me with this? Thanks :D

• Replies: 2
• Views: 25,842
05-12-2009, 08:28 AM
44. ### Need major help in this statistics problem

When looking at my text book. To answer the A, B, and C. at the bottom, we had to refer to our previous question in our book to help us with the...

• Replies: 17
• Views: 25,450
05-27-2008, 07:59 PM
45. ### Confidence Intervals for Skewed right distribution.

We have compiled data and made a histogram where n = 91,800. The average is 0.14098, the standard deviation is 0.143945, kurtosis is 8.23115, and...

• Replies: 3
• Views: 25,391
07-18-2008, 02:57 PM
46. ### reading F Table values

After using the F test using formula / where q is the number of beta values taken out ( that was 2) and k = number of parameters in the...

• Replies: 3
• Views: 25,390
08-21-2008, 01:41 PM
47. ### série temporelle

Bonjour, Dans le cadre de ma formation je dois réaliser une étude statistique à partir d'une base de données (sur n'importe quel sujet) Je suis...

• Replies: 1
• Views: 25,239
05-02-2013, 04:04 PM
48. ### ANOVA - Greenhouse Geisser

Hey folks, I'm just a little bit confused and hope someone might can help me: I'm working on the statistics part of my thesis and performed...

• Replies: 4
• Views: 25,132
Oak
03-02-2016, 11:05 AM
49. ### Dummy variables, standard deviation, standard error

Hi everyone, I am a PhD student in economics and i would like to know your opinions on the following problem. What is the meaning of the...

• Replies: 1
• Views: 25,089
02-04-2008, 10:56 AM
50. ### Normalizing standard deviation

Greetings! This is a simple question, I think, but one that I am too rusty now to deduce a clear answer to. If I have a mean (m) and associated...

• Replies: 3
• Views: 25,083
01-11-2013, 09:34 PM
51. ### non-parametric two way ANOVA

Hello, I'm so glad i found this site! I am wondering whether anyone knows of what non-parametric test i could use as equivalent to a two way...

• Replies: 7
• Views: 25,004
11-21-2008, 11:41 AM
52. ### T-test versus ANOVA

Hi all, I have two groups that I need to compare on several different dependent variables. I am wondering why I would choose to use a one-way...

• Replies: 17
• Views: 24,862
03-06-2014, 03:03 PM
53. ### Lower Limit and Upper Limit Confidence Levels

I am having trouble with a set of homework questions revolving around upper and lower limit confidence levels. Here is an example of what I mean: ...

• Replies: 1
• Views: 24,771
08-09-2007, 05:52 PM
54. ### Mixed Repeated Measures ANOVA - some questions

I have run an experiment and am analysing the results using a mixed RM ANOVA in SPSS. I have two queries, which I hope you can help me with. I...

• Replies: 7
• Views: 24,623
05-19-2009, 08:55 PM
55. ### table of critical Q-value

I am searching for a table of critical Q-values for n=100 (or more). Anyone can help me? thank you!

• Replies: 4
• Views: 24,530
08-11-2008, 10:38 AM
56. ### Assigning weights to variables

Hi all, I'm not a statistician, but just trying to get help on an analysis I'm running, so I apologize ahead of time if this question is basic,...

• Replies: 4
• Views: 24,483
06-11-2011, 02:57 PM

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