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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: 197,285
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: 67,042
09-30-2005, 09:44 AM
1. ### mid-class values

The following table gives the ages in completed years of 141 persons in a town involved in road accidents during a particular year. Ages (years):...

• Replies: 7
• Views: 9,421
11-12-2010, 08:18 AM
2. ### Finding a least squares fit for f(x)=A*cos(Bx)

Hello, I'm trying to derive the solutions for the estimates of A and B for the equation f(x)=A*cos(Bx) or ...cos(Bx+C) using least squares. I have...

• Replies: 5
• Views: 9,418
07-06-2008, 11:37 PM
3. ### Effect size - cohen's d

Hi everybody Who can help I got involved in an experiment at my college working on heart rates in horses before and after training. I think the...

• Replies: 2
• Views: 9,395
07-26-2008, 10:50 AM
4. ### Help

My question is: Find the critical value Chi squared R corresponding to a sample size of 3 and a confidence level of 95 percent. I know that...

• Replies: 3
• Views: 9,386
11-04-2005, 05:25 PM
5. ### Relationship b/w correlation and skewness

Hello I am currently working on network project an i m finding out correlation b/w data. My project supervisor suggested that correlation...

• Replies: 3
• Views: 9,374
08-24-2008, 11:09 AM
6. ### Partial Eta squared - how large is it?

Hi! I need some help in interpreting the partial eta squared in a MANCOVA. I know that it accounts for the variavence on the DV due to de IV...

• Replies: 1
• Views: 9,371
04-26-2010, 09:59 PM
7. ### hypothesis testing

I need help learning this. I know how to come up with the null and alternative statements but i don't know how to determine which one is the the...

• Replies: 1
• Views: 9,364
01-28-2007, 11:24 AM
8. ### Experimental design...plz help !!

1) A corporation employs 2000 male and 500 female engineers. A stratified random sample of 200 male and 50 female engineers gives each engineer 1...

• Replies: 3
• Views: 9,359
11-05-2006, 11:32 PM
9. ### Chi-square (χ2) test a small dilemma

I used Chi-square (χ2) test to investigate the statistical significance of differences of opinion about the students offered the choice of...

• Replies: 0
• Views: 9,326
02-12-2014, 01:16 AM
10. ### Chisquared equivalent for 2x5 table?

Hi, I have a quick question re: analysing a dataset. The resulting table is 5 rows (a,b,c,d,e) and 2 columns (yes/no). I would like to determine...

• Replies: 9
• Views: 9,324
01-26-2009, 04:02 PM
11. ### what is the meaning of the N-1 in standard deviation

Hi Just to understand the role of N-1 in the standard deviation formula, I've done the following experiment. 1. Take a set of values and...

• Replies: 2
• Views: 9,321
01-21-2011, 10:19 AM
12. ### Testing the difference between two reliability statistics: ICC vs. kappa

Dear all, I would like to test if the interobserver reliabilities of two assessments differ significantly. The problem is: the assessments are...

• Replies: 1
• Views: 9,314
01-26-2009, 02:00 PM
13. ### [need help] example Variogram in excel

Hi All ! im newbie here ^^ I need example of creating variogram in excel.. Any help is very welcome. Thanking in advance. Kind regards,...

• Replies: 1
• Views: 9,310
03-10-2011, 12:33 PM
14. ### 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: 9,282
02-15-2012, 02:00 PM
15. ### Data will not normalize & need to run ANOVA

Hello, I have a set of data that I need to run a 2-way ANOVA on. My data is very highly skewed to the right, so it does not follow a normal...

• Replies: 6
• Views: 9,272
02-22-2013, 06:55 PM
16. ### Online Statistics Resources

Statistics textbooks: Concepts and Applications of Inferential Statistics HyperStat Online Electronic Statistics Textbook DIG Stats

• Replies: 1
• Views: 9,267
06-12-2012, 11:59 PM
17. ### statistics for dummies

Hi All: I am not a math person and know very littel about statistics. I have conducted an experiment by dividing my students randomly into two...

• Replies: 1
• Views: 9,266
01-15-2008, 01:44 AM
18. ### Significance level. Critical Value approach

Help please. All i need is to know what formula to use with this question and i will be ok. There are so many and i have been stuck for days. ...

• Replies: 3
• Views: 9,262
03-13-2009, 02:50 PM

Hi, I tried running factor analysis using correlations matrix as input data - used varimax to get orthogonal factors. How do I read the...

• Replies: 3
• Views: 9,247
12-29-2011, 10:10 AM
20. ### Calculating average annual percentage change for trend data

Hi I'm a student with prescription medication use data and I am analyzing trends in use between 1996 and 2005. Specifically, my data are...

• Replies: 0
• Views: 9,240
02-23-2009, 06:56 PM
21. ### Hypothesis testing???

Hi, I have a homework problem I need help with...if anyone could help or even point me in the direction of similar examples, I would be grateful! I...

• Replies: 16
• Views: 9,237
10-05-2014, 03:38 AM
22. ### Faster Binomial distribution

I have question to do that would require me to write out about a page of binomial distribution equations. I am wondering if there is a better way to...

• Replies: 6
• Views: 9,232
02-22-2011, 01:58 PM
23. ### Explain standard deviation formula

Hi all, We take the square root of variance to get the standard deviation, right? And the reason is that variance units are in square terms....

• Replies: 7
• Views: 9,227
09-12-2010, 12:44 PM
24. ### Multiple Regression: How to obtain VIF values from correlation coefficient

I understand that VIF = 1 / (1-R^2) If I only have the parameter estimates table with the intercept, X1, and X2 and also the correlation...

• Replies: 3
• Views: 9,204
10-28-2011, 09:13 AM
25. ### Theil U statIstic

Hey I was doing an assignment and my professor want Theil U stat for validation purpose of the forecasting that i have done .Can anyone please...

• Replies: 1
• Views: 9,203
10-02-2009, 11:15 AM
26. ### degrees of freedom for residuals in Anova

Hi, I want to establish if this method is correct to find the degrees of freedom for the anova residuals. say t treatments with r replicates. ...

• Replies: 6
• Views: 9,198
12-05-2009, 11:19 AM
27. ### Relation between gamma function and exponential function

Hi All, Can someone help me understand the relation between the gamma function and exponential function, please? Basically, I am trying to figure...

• Replies: 2
• Views: 9,195
04-27-2009, 10:39 AM
28. ### Confirmatory Factor Analysis: Appropriateness and interpretation

Greetings, all! I am working on the statistics for my dissertation, and while it seems that confirmatory factor analysis fits my needs based on...

• Replies: 2
• Views: 9,189
06-16-2011, 10:30 AM
29. ### 95% confidence interval help

How much money does the average professional football fan spend on food at a single football game? That question was posed to ten randomly selected...

• Replies: 8
• Views: 9,179
10-25-2006, 09:36 PM
30. ### Norms and standardization

As a starter, my question is very simple. How to apply norms and standardize a test. I have two tools - One with 120 items and another with...

• Replies: 20
• Views: 9,178
11-08-2010, 08:19 AM
31. ### tukee formula for outliers

what is it? can't find it.

• Replies: 1
• Views: 9,171
10-22-2007, 08:34 AM
32. ### Nonparametric version of MANOVA in SPSS

Does anyone know how to run a multiple DV nonparametric version of a MANOVA in SPSS? I see that you can select Analyze/Nonparametric Tests/K...

• Replies: 1
• Views: 9,167
07-16-2009, 11:32 PM
33. ### Cronbach's coefficient alpha

Hi, I'm calculating cronbach's coefficient alpha for items on a newly constructed test consisting of likert scale items. The frequency of...

• Replies: 4
• Views: 9,165
06-19-2009, 08:11 PM
34. ### Technical replicates vs. biological replicates

I've done a lot of reading on hypothesis testing and I can't find the answer to this question: What is the standard way to handle variation in...

• Replies: 2
• Views: 9,159
05-22-2008, 12:57 AM
35. ### Nonparametric equivalent for (factorial) MANOVA?

I once had some experience in SPSS/statistical testing, but now I really need it, I cannot seem to find the appropriate tests. I hope anyone can...

• Replies: 8
• Views: 9,154
07-08-2011, 08:40 AM

A study at a college in the west coast reveals that, historically, 45% of their students are minority students. If random samples of size 75 are...

• Replies: 6
• Views: 9,150
07-14-2010, 05:55 PM
37. ### What is oversampling?

Hi, Please help me understand this paragraph. "Your response rate is anticipated before you carry out your sample selection, so you need to...

• Replies: 2
• Views: 9,130
04-28-2011, 10:46 PM
38. ### Multiple, Single Sample t-tests (and Wilcoxon)

Hi everyone, I have an experiement with several groups of animals that have all received a different treatment and each group is subsequently...

• Replies: 3
• Views: 9,097
11-19-2009, 08:43 AM
39. ### Tukey's HSD formulas

I am analyzing real-world temperature data which came out significantly different in the ANOVAs. There seem to be two formulas for the Tukey's HSD...

• Replies: 2
• Views: 9,089
09-28-2010, 11:34 PM
40. ### urgent help required in stats

I need only explanation to these basic level questions for my son 1. The archaeological site of Tara is more than 4,000 years old. Tradition...

• Replies: 0
• Views: 9,080
07-15-2007, 09:31 PM
41. ### Winsorizing data

Hi there, I already checked the two other threads about winsorizing, but it didn't solve my problem. I have a dataset for OLS regression and...

• Replies: 2
• Views: 9,049
11-03-2012, 06:07 AM
42. ### Confidence Interval Help

Hello :) I have a question in my homework that states: "Lorraine computed a confidence interval for μ based on a sample size of 41. Since she...

• Replies: 3
• Views: 9,044
04-16-2014, 03:11 PM
43. ### t- and F- values of correlation efficients

What are the data sets that are used in finding t-value and F-value of correlation coefficients? If the correlation coefficient for X data set and Y...

• Replies: 11
• Views: 9,042
08-13-2010, 11:55 AM
44. ### kolmogorov smirnov interpretation significance level

Hi, I used the kolmogorov smirnov(K-S) test in order to determine if a experimental distribution fits a power law distribution. I get the...

• Replies: 0
• Views: 9,033
06-19-2009, 09:03 AM
45. ### AMOS - fit indices for nonnormal data

Dear all, I've am struggling on a CFA in AMOS conducted on multivariate nonnormal data. I want to identify the factorial structure that best...

• Replies: 3
• Views: 9,026
10-30-2012, 08:04 AM
46. ### Bayesian Statistics Question

My current state is that I am clueless and have no idea what to do with it. Could somebody provide me some knowledge of how to start with this?

• Replies: 51
• Views: 9,014
12-12-2011, 11:49 AM
47. ### Finding Quartiles in a normal distribution

How would one find quartiles in a normal distribution with mean and standard deviation other that (0,1)?

• Replies: 1
• Views: 9,014
03-24-2012, 10:54 AM
48. ### 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: 8,995
02-12-2009, 05:01 AM
49. ### Fisher's exact and Yates' correction for continuity

i got a bit confused, could any one remine me please, when to use Fisher's exact and Yates' correction for continuity in 2x2 tale with one or more...

• Replies: 2
• Views: 8,984
08-16-2010, 11:38 PM
50. ### ANOVA interactions,Tukey HSD

Hello I am analyzing behavioral data on face processing. This is a within-subject 3x2x2 design. When I run repeated-measure ANOVA, I obtain...

• Replies: 1
• Views: 8,974
09-17-2008, 09:15 AM
51. ### Writing results from transformed data - help needed asap

Hello Sorry if this is a silly question but I am fairly new to writing up reports using transformed data and would be very grateful if someone...

• Replies: 1
• Views: 8,970
08-28-2008, 08:06 PM
52. ### What is/are Latent Dimension(s)

In the following description of Discriminant Analyses, what is meant by "latent dimensions"? "It is a multivariate technique that considers the...

• Replies: 5
• Views: 8,963
08-18-2012, 07:24 PM
53. ### Data independent and identically distributed... How to prove it?

Hello everybody! I am running a frequency analysis of flood and wind speed, for which the data are assumed to be independent and identically...

• Replies: 3
• Views: 8,961
11-18-2011, 11:26 AM
54. ### confidence interval for covariance estimation

Is it possible to calculate the confidence interval for the sample covariance estimation of two random variables? The two random variables can be...

• Replies: 4
• Views: 8,954
06-01-2010, 01:56 PM
55. ### 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: 8,941
08-29-2012, 12:53 AM
56. ### Distribution of MLE

Hey guys how are you? I have the following question: Let X1,X2,...,Xn be a random sample from a Pareto distribution having pdf f(x|b)=...

• Replies: 30
• Views: 8,933
10-30-2011, 04:53 PM
57. ### Please someone help me

4. A political strategist believes that 58% of voters in a certain state support his candidate. He then commissions a poll of 600 voters and 53% of...

• Replies: 2
• Views: 8,924
11-13-2006, 12:29 AM
58. ### Comparing variable frequency in groups=help!

Hi, I am in need of desperate help. I have collected data consisting of frequencies of aggression in a group of chickens according to different...

• Replies: 4
• Views: 8,917
02-23-2011, 05:06 PM

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