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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: 196,729
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: 66,736
09-30-2005, 09:44 AM
1. ### SEM: poor fit, large sample, a lot of DF with significant coefficients.

I am running an analysis of the influence of gender on a number of performance outcomes. My model is also moderated by the gender of the evaluator. ...

• Replies: 6
• Views: 3,210
05-14-2013, 09:01 PM
2. ### Likert scale for continuous selection/ranking

I am new to this forum and have limited statistical background from a business BOS 10 years ago. I need help to find an...

• Replies: 2
• Views: 1,297
05-14-2013, 06:23 PM
3. ### 2 way ANOVA post hoc tests SPSS

:wave:I have been using 2 way ANOVAs SPSS in base 15.0 to look at the effect of two fixed factors (treatment and brain region) on a dependent...

• Replies: 4
• Views: 10,510
05-14-2013, 02:53 PM
4. ### 2way anova problem

hello!!! im studying psychology and i have a problem in my dissertation.in my study i used 3x2 anova in order to examine the effect of colour...

• Replies: 3
• Views: 1,253
05-14-2013, 02:02 PM
5. ### So confused

Hi everyone, I have a statistics final coming up and I am always confused with Poisson, Binomial and Hyper-geometric. My teacher specifically...

• Replies: 5
• Views: 1,735
05-14-2013, 11:55 AM
6. ### compare two Beta coefficience between two different model.

I am running two regressions, each with the one independent variables (Y) but with two different dependent variables (X1, X2). examply: Y is...

• Replies: 1
• Views: 1,889
05-13-2013, 06:39 PM
7. ### 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: 10,062
05-13-2013, 05:58 PM
8. ### Statistical Assumptions

Okay i am not good with stats....thus this is the first part of my paper...I need help with stating the statistical assumption of the test. Also I...

• Replies: 1
• Views: 1,064
05-13-2013, 02:54 PM

Hi everyone , can you help me for my statistic homework ? Assume that your aim is to estimate the average height of the adult men in a city....

• Replies: 2
• Views: 1,190
05-13-2013, 10:40 AM

Hello , I started a Statistics class a few weeks ago and i'm still pretty lost. Could someone explain to me how I should resolve this following...

• Replies: 2
• Views: 1,329
05-13-2013, 08:21 AM
11. ### Relation algebra - matrix construction

Hi, In a DEA-software I have, I must construct logical weights. These weights are constructed as a matrix solution of relationships between the...

• Replies: 0
• Views: 917
05-13-2013, 01:52 AM
12. ### need help: ordinal data used as predictor for linear multiple regression analysis??

Part of my thesis tries to investigate the extent to which students "test Score" on the topic of electrical circuits in physic can be predicted from...

• Replies: 2
• Views: 1,163
05-12-2013, 11:35 PM
13. ### Motivational and Behavioral Classes for User Segmentation

Hi everyone, In the course of a research project with a sample size of > 1000, I intend to first group users in unique motivation/motive classes....

• Replies: 1
• Views: 1,023
05-12-2013, 10:50 AM
14. ### Likelihood Ratio Statistic & P-value

Good day everyone, and thank you for taking the time to look at my question. 1. The problem statement, all variables and given/known data ...

• Replies: 2
• Views: 2,003
05-12-2013, 09:28 AM
15. ### help with the decision about my Master....

Hi everyone... my name is John and i am from Greece.. i recently graduated from University of Pireaus, department of Statistics and Insurance...

• Replies: 2
• Views: 1,179
05-12-2013, 09:11 AM
16. ### Test for Independence

Use X^2 Test for Independence at the 5% L.O.S. Show your hypothesis, the test, state your conclusion... Show the matrix of the expected values and...

• Replies: 2
• Views: 1,269
05-12-2013, 09:00 AM
17. ### statistical test for a very small sample?

Hi everyone :wave:, I stumbled across this forum after some googling, and I must say very useful stuff you got here. I have a question about...

• Replies: 2
• Views: 1,888
05-12-2013, 07:39 AM
18. ### Propagation of uncertainity

I'm a cell biologist and struggling with a problem concerning the propagation of uncertainity. Since I'm no expert in statistics, I'll just start...

• Replies: 1
• Views: 1,593
05-12-2013, 02:50 AM
19. ### Testing for "Compensatory Adaption" or "Compensatory Substitution" effect

Hello Folks! Background: ----------------------------------------------- I surveyed telecommuters. Among other variables, I measured the...

• Replies: 0
• Views: 1,291
05-11-2013, 03:34 PM
20. ### Mann Whitney U - P Value of 0.0000

Good Afternoon all, I am using a Mann Whitney U to compare two populations the data ranges from (-2 to 2). I have already done this on 4...

• Replies: 9
• Views: 9,477
05-11-2013, 02:33 PM
21. ### Least Regression Line, The Coefficient of Deter....

Values of Car(\$1000) 20,10,26,12,19,22,13,16,25,8,10 Student GPA. 2.5 3.5 2.2 3.7 2.7 3.0 2.9 3.2 2.2 3.8 3.7 b)Give the Equation for the...

• Replies: 2
• Views: 1,776
PSG
05-11-2013, 01:26 PM
22. ### Clusters building from series of financial data

Hi everyone, First of all I need to tell you that I don't know many things about statistics - I work in finance. Currently I need to...

• Replies: 1
• Views: 1,187
05-11-2013, 06:28 AM
23. ### comparing two simple random variables

Hallo! My Homework subject: compare two independent random variables X=(X1, …, Xn ) and Y=(Y1, … , Ym) drawn from a normal distribution and...

• Replies: 0
• Views: 1,722
05-11-2013, 05:22 AM
24. ### shared variance

can anybody give me simple definition of this concept? Is it the same as covariance?

• Replies: 2
• Views: 19,516
05-10-2013, 12:02 PM
25. ### serious variable confusion

Ok, so the problem I'm having is that my tutor has been incredibly unclear about variables for the report we have to write. In class, she said X...

• Replies: 3
• Views: 2,149
05-10-2013, 06:13 AM
26. ### [Ordinary Least Squares Regression By Hand] Explanation help needed

Hi, I'm working on a problem that requires doing OLS by hand. I have the answers but I'm trying to understand why it uses certain formulas, which...

• Replies: 3
• Views: 1,756
05-10-2013, 02:37 AM
27. ### free throw problem

If a free throw shooter makes 80 out of 100, what is the probability that he makes atleast 85 free throws next time. I had one more question as...

• Replies: 1
• Views: 1,147
05-09-2013, 10:37 PM
28. ### Comparing means from two weighted data sets

Hi, I'm hoping I can get help with a problem. I have two survey data sets, one from 2006 and one from 2013, and I'd like to see whether there's...

• Replies: 0
• Views: 1,615
05-09-2013, 12:41 PM
29. ### Regression Poisson

Hi :wave:, first of all, sorry for my english, I'm not english. My question is a quite specific of a problem. I'm doing a regression of a Poisson...

• Replies: 6
• Views: 2,283
BGM
05-09-2013, 04:08 AM
30. ### Throwing die question

I have a question I was going to see if anyone could explain to me. If you roll a die 10 times, what is the probability that you roll a 6 at...

• Replies: 1
• Views: 1,146
05-08-2013, 10:49 PM
31. ### Can R-squares from simple linear regression models (for the same regressand) summed

Hi! I am Tusawar. I will be thankful to the person extracting some time to resolve my problem. PROBLEM Suppose we have the following 3 simple...

• Replies: 4
• Views: 1,518
05-08-2013, 06:19 PM
32. ### help with how to analyse my stats!

heya, I was hoping someone could give me some advice on the best way to carry out my stats analysis in my researc hproject. I will be showing...

• Replies: 5
• Views: 1,570
05-08-2013, 05:55 PM
33. ### Which statistical procedure to use (given standard deviations and means)?

Can someone please help me with this? Which statistical procedure could I use, and how could I set this up? A company operates four machines during...

• Replies: 0
• Views: 1,712
05-08-2013, 04:25 PM
34. ### Basic Question about Weight Average

This is a pretty simple question and I'm wondering how to go about finding a solution. I have the following data. ttt =...

• Replies: 0
• Views: 883
05-08-2013, 10:20 AM
35. ### Comparing fitness in populations under two schemes

I have two populations that vary in their ability to complete a task. At the end of each simulation run the mean of each population's fitness is...

• Replies: 4
• Views: 1,486
05-08-2013, 09:50 AM
36. ### Help finding confidence interval.

I've been struggling with this problem for some time. Any help would be appreciated. A superintendent of a school district believes that the...

• Replies: 1
• Views: 828
BGM
05-08-2013, 12:40 AM
37. ### T-test vs.Anova Help please!

I've had this data for so long and I just can't figure out how to analyze it. Please help. I have two groups of students; one group mentored at one...

• Replies: 1
• Views: 978
05-07-2013, 11:41 PM
38. ### Finding the obtained f from t.

Moo. Hey now brown cow.

• Replies: 4
• Views: 1,816
05-07-2013, 11:07 PM
39. ### Conservative Confidence Interval

Assume X~f(x;θ), θ>0 where f(x;θ)=x^(-θ) - (x+2)^(-θ). Derive a conservative one-sided upper 95% confidence interval for θ if x=5 is observed. ...

• Replies: 2
• Views: 1,239
05-07-2013, 06:53 PM
40. ### statistical analysis technique

Hi all, looking for some help in best analysis tool to use. I want to test the effects of multiple independent variables on one dependent...

• Replies: 2
• Views: 1,563
05-07-2013, 04:59 PM
41. ### Z value

I'm working on a problem that requires me to make a conclusion on possible defective products. I've done z values before but have not come across one...

• Replies: 5
• Views: 1,705
05-07-2013, 04:29 PM
42. ### Need help with a statistics problem.

I need to find the best time to goto the bus stop based on 123 Observable Data's. The data is based on two variables. Weather and Time The...

• Replies: 1
• Views: 1,192
05-07-2013, 03:13 PM
43. ### Principle Components Analysis and Cluster Analysis

Hi, I was wondering if you could all hep me decode the difference between both PCA and cluster analysis. As far as I can tell, PCA aims...

• Replies: 4
• Views: 2,479
05-07-2013, 03:12 PM
44. ### z-score formula when mean is not a solid value?

I'm having trouble setting up my formula because in this specific problem it's saying the mean is "greater than" 35. I know how to set up the formula...

• Replies: 3
• Views: 1,665
05-07-2013, 11:09 AM
45. ### tests for normal data

Hi, I posted some like my questions, but I didn't stay very clearly with my problem. I have some rows of data like 1 0 2 1 3 0 I need...

• Replies: 25
• Views: 6,689
05-07-2013, 10:27 AM
46. ### 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: 10,270
05-07-2013, 10:14 AM
47. ### Nonparametric alternative for Spearman's rho for correlation strength?

My question is as simple as it may be difficult: is there any other nonparametric test besides Spearman's rho to compute the correlation strength...

• Replies: 2
• Views: 1,679
05-07-2013, 05:39 AM
48. ### what statistical test should I use?

Hello everybody! The poor statistician that I am needs your help! I want to realize a survey based on Likert questions. What i want to know is...

• Replies: 3
• Views: 1,569
05-07-2013, 02:31 AM
49. ### OC Curve Program

One of my friends has asked me to help him write a program to calculate the "n" and "c" values (sampling size, accept number), only given...

• Replies: 0
• Views: 1,768
05-06-2013, 07:44 PM
50. ### A bit basic but....Help!

Honestly this problem put me into a stump. I'm used t having set of data values, but now I'm just confused on this. I am just starting statistics so...

• Replies: 1
• Views: 3,227
05-06-2013, 06:48 PM
51. ### Calculating Probability from Mean and standard deviation

Hello, im having difficulty in solving the following problem, Could anyone please solve this. Lifts usually have signs indicating their maximum...

• Replies: 2
• Views: 2,829
05-06-2013, 01:32 PM
52. ### coefficient of variation

I would like to check the reliability of my test retest study. Different raters measured height and weight twice (visits 1 week apart) on 5...

• Replies: 1
• Views: 1,518
05-06-2013, 11:58 AM
53. ### Repeated Measures ANCOVA - questions on covariates and output

Hello everybody, I need some help with a RM ANOVA or ANCOVA. I have to help an intern at my department with her analyses but don't the answers...

• Replies: 0
• Views: 1,527
05-06-2013, 10:46 AM
54. ### 2 x 2 data, statistical test

Hi, This is a simple question, but what is the appropriate statistical test for the following situation. ...

• Replies: 3
• Views: 1,783
05-06-2013, 06:28 AM
55. ### Estimation and Hypothesis Testing

Hey, I'm new here, hope this is the right spot for this. I was very good at understanding this information when we moved in sections because I knew...

• Replies: 1
• Views: 1,147
05-05-2013, 05:17 PM
56. ### Fractional Factorial Experiment Design

I know that to get the alias rows with the main factor effects, I use mod 2 multiplication with the main effects and the elements of the defining...

• Replies: 0
• Views: 880
05-05-2013, 01:06 PM
57. ### standardised indirect effects in multimediational analysis

Hi I have been using Andrew Hayes PROCESS to calculate indirect effects in a multimediational model. Is there a way to calculate standardized or...

• Replies: 0
• Views: 1,770
05-05-2013, 07:17 AM
58. ### Two different populations?

I posted a while ago about a project that I had to do and I think I got it but I have a question. I'm doing it on graduation rates in America...

• Replies: 1
• Views: 1,527
05-05-2013, 01:56 AM

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