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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: 197,128
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: 66,938
09-30-2005, 09:44 AM
1. ### Nonparametric 3 factor ANOVA

I am trying to find a nonparametric equivalent for 3 within subject factors ANOVA test. I checked Friedman test, but all the examples that I found...

• Replies: 3
• Views: 10,310
05-07-2013, 10:14 AM
2. ### R question/Command to calculate Confidence Interval of a Mean?

Does anyone know what command I should use in R for a confidence interval test on a one-sample mean? I know the command to estimate the...

• Replies: 2
• Views: 10,308
01-04-2012, 08:58 AM
3. ### sample proportion of a binomial distribution

All, I am trying to figure out the probability (using a binomial distribution) that a sample proportion (4/100) will be greater than or equal to...

• Replies: 17
• Views: 10,292
01-31-2010, 04:43 PM
4. ### Effect Size for mixed model (SPSS)

OK ... linear mixed models for SPSS do not provide an effect size. There is no sum of squares, SD etc. for the usual suspects. I've read some stuff...

• Replies: 1
• Views: 10,273
06-22-2010, 05:21 AM
5. ### Covariance of Multinomial Trials

The problem is to find the covariance of N_i and N_j where N_1, N_2,...,N_r are multinomial random variables. It is known that the marginal...

• Replies: 1
• Views: 10,264
01-13-2013, 02:20 AM
6. ### How to prove the formula for leverage/diagonal of H matrix?

hii =1/n+(Xi-Xbar )^2/Sxx

• Replies: 1
• Views: 10,261
BGM
12-12-2010, 02:04 AM
7. ### Regression Analysis Margin of Error

I have this question: Data were collected from 10 male patients in hospital after they had suffered a heart attack. The following table shows the...

• Replies: 1
• Views: 10,259
06-02-2010, 02:22 AM
8. ### I Need Help

All, I am struggling with Statistics in all areas. I'm great with numbers, however, I'm lost with this. Can someone help? Here are the following...

• Replies: 6
• Views: 10,257
11-03-2005, 12:41 PM
9. ### home work help/my answers are not matching the options

The grade point averages for 10 randomly selected high school students are listed below.Assume the grade point average are normally distributed. 2.0...

• Replies: 2
• Views: 10,244
04-13-2008, 07:50 AM
10. ### Single item indicators in SEM (AMOS)

Hello Im using AMOS for structural equation modeling. My current model has 6 latent constructs that are each measured by 2-4 observable...

• Replies: 2
• Views: 10,215
12-17-2009, 05:39 AM
11. ### Partial eta squared

For my thesis I need to refer to a document which contains the standards as to which values of partial eta squared are considered low, medium or...

• Replies: 5
• Views: 10,213
09-04-2013, 09:34 AM
12. ### What test to use?

Hi there I have data in a 2x3 table, and want to test for significance. Over half of the cells in the table have values less than 5. If it were...

• Replies: 3
• Views: 10,207
01-28-2010, 02:26 AM
13. ### average of two means from the same data?

I've been given two means from the same data set (split into people who said yes and no) from this i have to find the mean of the total of the data....

• Replies: 2
• Views: 10,166
10-01-2006, 08:19 AM
14. ### OLS Intercept Standard Error

How do you calculate the standard error of the intercept in OLS regression analysis? The excel regression analysis output has the intercept's...

• Replies: 1
• Views: 10,161
11-14-2009, 06:07 PM
15. ### When to report the Levene test?

Hi all, I'm stuck on two questions, basically don't know whether I should report the Levene tests or not. Both designs are between subjects...

• Replies: 1
• Views: 10,152
03-18-2009, 04:20 PM
16. ### Help on Permutations and Combinations

Hi all, I've been working on two problems that are really stumping me, and would really appreciate some help. Here are the problems and how I...

• Replies: 2
• Views: 10,148
07-10-2012, 01:20 PM
17. ### Median with "tied values"

Hi all, My first stats course was almost 20 years ago. I'm starting again and have come across a calculation for median that I've never seen...

• Replies: 21
• Views: 10,147
11-20-2011, 02:07 PM
18. ### Observed and expected

It may be a very silly question, but I have trouble conceptualizing these two terms. I had this contingency table with 2 rows and colums. Is...

• Replies: 3
• Views: 10,143
02-12-2006, 05:24 PM
19. ### Howa To categorize a continious variable

Hi everybody, I am a new member in your forum, hope everyone is going well, and hope that you can help me for this simple question : How...

• Replies: 4
• Views: 10,143
11-27-2010, 11:05 AM
20. ### Mann Whitney test interpretation

Hello I conducted Mann Whitney test to see if there is a significant difference in the duration spent by two groups (x,y) in a country ,and found...

• Replies: 1
• Views: 10,142
10-13-2010, 01:06 AM
21. ### Testing joint significance

Hi I have a set of data with observations on two scores: a measure of worker pay, and a measure of IQ. I am representing group averages for...

• Replies: 0
• Views: 10,142
10-26-2010, 10:29 AM
22. ### Analysis of simple yes/no data?

Hello. I am dealing with choice data (dependent variables are 'correct' or 'incorrect' choice), and am unsure of the analysis. I have 2 experimental...

• Replies: 1
• Views: 10,136
02-23-2009, 04:44 PM
23. ### Meaning of a Statistically Significant Intercept

Greetings: I have been attempting to define the meaning of a statistically significant intercept in multiple regression. I have searched the Web...

• Replies: 7
• Views: 10,124
05-13-2013, 05:58 PM
24. ### Forecasting MA(1) process

Suppose x_{t} = w_{t} + \theta w_{t-1} where w_t is white noise with variance \sigma_{w}^2 Derive the minimum mean square error one-step forecast...

• Replies: 3
• Views: 10,120
02-24-2013, 12:29 PM
25. ### Need Help..not sure which formula to use.

Hey everyone! I have a homework problem that I am stuck on. Here it goes: A researcher at a major hospital wishes to estimate the proportion of...

• Replies: 4
• Views: 10,119
07-23-2010, 03:39 PM
26. ### moderator? mediator? confounder?

Hello, Are moderator variable and mediator variable both types of confounding variables? What how are moderators different from mediators?

• Replies: 1
• Views: 10,082
09-20-2009, 03:38 AM
27. ### sample standard deviation from population standard deviation?

Hello :) My question is: The number of hours spent watching TV by students in the week before finals has a normal distribution with unknown mean...

• Replies: 1
• Views: 10,076
10-16-2010, 09:04 AM
28. ### Business Stats Project - where to find data set

Hi, I have an MBA group project which requires us to: 1. Identify a business problem 2. Design an experiment using ANOVAs (min of 2...

• Replies: 3
• Views: 10,065
08-18-2008, 02:24 AM
29. ### Nested ANOVA with unequal sample sizes

Hello, I am writing because I am unsure as to whether I can perform a nested ANOVA with unequal sample sizes. I have two main groups: subject type...

• Replies: 5
• Views: 10,045
01-05-2010, 06:09 PM
30. ### Negative Lower Limits

Hello. I am new to the forum, but am taking Business Statistics II and will probably become a frequent visitor here. My question is, in figuring...

• Replies: 4
• Views: 10,037
06-01-2012, 03:10 PM
31. ### confidence interval and sampling size accuracy confusion.

Hi, I have to find the best interpretation of a confidence interval and I am kind of stuck, i always explain my confidence interval something like,...

• Replies: 5
• Views: 10,034
11-15-2010, 12:49 PM
32. ### Survey Question - Multiple Options & how to calculate percentages

I need to know what the most staistically sound calculation of percentages is for the following: I have a survey question that has multiple...

• Replies: 0
• Views: 10,030
05-16-2008, 09:23 AM
33. ### true mean

Hi can you help me with another question please. i have been given the critical dimension of a random sample of 16 auto crankshafts measured in mm...

• Replies: 1
• Views: 10,025
01-20-2006, 04:03 PM
34. ### I cant figure out the number of classes

from these numbers I have to make a six column f/d table 30 26 16 23 22 10 8 15 16 23 29 30 22 15 24 9 5 4 15 24 21 24 16 14 21 13 6 2 23 29 24...

• Replies: 9
• Views: 10,012
10-12-2008, 02:19 PM
35. ### Logistic regression versus chi square test for RCT data

Hi My understanding of statistics is basic and mostly on an applied level, but now I have come into a discussion with my project leader and I'm...

• Replies: 10
• Views: 10,011
03-17-2013, 03:46 AM
36. ### A big problem for smart people

I have two possibilities; X1 and X2. The question is: If you know that X1 gives you 0 then what does X2 give you? I set up a table: ...

• Replies: 0
• Views: 10,005
09-25-2009, 02:03 PM
37. ### Probability of a Mailing Machine

I need some real serious help. This is the problem I need to finish. A technician services mailing machines at companies in the Phoenix area....

• Replies: 4
• Views: 9,990
10-09-2005, 05:53 PM
38. ### scatterplot apa style?

I dont have my APA manual with me (stuck in qld floods) and have an assignment due in tomorrow. I am wanting to put my scatterplot as a figure in my...

• Replies: 0
• Views: 9,978
01-12-2011, 07:03 PM
39. ### normal vs nonnormal distribution??

Hi, we just learned about the nonnormal distribution in class today, but I'm afraid that I'm still a little confused. I'm stuck on this problem: ...

• Replies: 1
• Views: 9,977
07-23-2008, 08:13 PM
40. ### parametric or non parametric

Hi, I was wondering if you could help me with my problem. I have obtained some data from a lab experiment i have conducted, but I do not know if my...

• Replies: 3
• Views: 9,970
03-26-2009, 04:54 PM
41. ### Chebyshev’s theorem

Standardize the data 10, 21, 23, 27, 27, 29, 30, 32, 33, 40, then identify the percentage of observations that fall within k = 2.0 standard...

• Replies: 5
• Views: 9,959
02-27-2014, 04:27 AM
42. ### What statistical analyses to use? How age influences bone density

So I have a variable, lets say Bone density in older adults. I have200+ participants ranging from 50-80 years and with its respective bone...

• Replies: 7
• Views: 9,955
03-18-2014, 03:04 AM
43. ### Difficulty distinguishing between discrete and continuous data

I have been trying for ages to solve this question, been looking up on the internet and various forums all of which have yielded conflicting results...

• Replies: 1
• Views: 9,950
08-12-2010, 12:00 AM
44. ### re: zero in confidence interval but p-value < alpha

Hello. I would be very much appreciative of any help in this issue. The problem involves the difference of means of 2 dependent samples. The null...

• Replies: 7
• Views: 9,948
11-14-2008, 07:27 PM
45. ### Nominal - Interval and Ordinal - Interval analyses

I'm trying to help out a friend who is finishing up a report on the results of a survey she conducted on domestic violence in a minority population,...

• Replies: 3
• Views: 9,940
10-27-2009, 12:35 PM
46. ### Symbol for Regression Test

Hi, I am looking for the symbol used for linear regression analysis tests. I know Chi Square is 'X squared', and correlation coefficient is 'r',...

• Replies: 2
• Views: 9,931
01-13-2011, 08:32 PM
47. ### Formula to calculate sample size in Pearson's correlation

Dear Teachers and friends, hi. i am from Malaysia, UKM student, occupational therapy student. i now writing my final year thesis. i now looking...

• Replies: 0
• Views: 9,922
02-04-2009, 06:54 AM
48. ### Comparison of two geometric means

Dear All, Is there any statistical test to compare two geometric means of two different groups?? Or any other alternative method to compare?? ...

• Replies: 1
• Views: 9,914
06-01-2009, 03:10 AM
49. ### F-test with 6 dummy variables. What is the formula?

Hi everybody, I am working on an assignment, and I am now stuck at a question that I can not understand clearly: "onduct an F-test for the...

• Replies: 5
• Views: 9,904
03-27-2011, 01:38 PM
50. ### Test for linear trend

Could anyone please offer some advice on how to test for linear trend. I am conducting a case control study looking at the associatio between folate...

• Replies: 3
• Views: 9,887
07-19-2009, 06:17 PM
51. ### Sample size for mean with unknown standard deviation?

I'm looking for a sample size for an experiment I'm doing. There isn't available data to get a standard deviation (looking at coefficient of friction...

• Replies: 3
• Views: 9,875
11-28-2010, 10:57 AM
52. ### What are the advantages of the mean squared error versus the mean absolute error?

I understand the formulas for each, but don't understand the advantages of using one over the other. If you could provide a situation that would...

• Replies: 2
• Views: 9,870
07-16-2014, 10:26 AM
53. ### Mean split vs. median split

Hi, Could anyone please explain to me what the exact difference between Mean split and median split? And which one much recommended? Many...

• Replies: 6
• Views: 9,865
03-27-2014, 03:57 PM
54. ### IID vs IIA; mixed vs conditional vs multinomial logit models

I am reading books on categorical data analysis. are the assumption of indepently and identically distributed (errors terms) and independence of...

• Replies: 7
• Views: 9,855
10-11-2011, 08:30 PM
55. ### two sample z test for proportions

Hello! I am in need of some help! I am trying to run a 2 sample z test for proportions for my project and I think I did it right using my TI-83...

• Replies: 3
• Views: 9,838
06-29-2009, 06:50 AM

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