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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### 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: 66,868
09-30-2005, 09:44 AM
2. ### 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: 196,982
07-16-2014, 11:01 AM
1. ### Analysis of three difference samples

Hi there, I have surveyed three separate populations frome which I have obtained fairly representative samples. One was a stratified sample (as...

• Replies: 0
• Views: 1,928
max
05-24-2006, 04:30 AM
2. ### Question about multivariate regression results

I'm a PhD candidate working with my dissertation data in organizational theory. I'm having trouble understanding my data results and have a few...

• Replies: 0
• Views: 2,509
05-24-2006, 01:45 PM
3. ### transformations of explanatory variable

If you look at the residuals for some response variable y regressed on some explanatory variable x and you see some pattern, e.g. the residuals seem...

• Replies: 0
• Views: 3,302
05-28-2006, 12:55 AM
4. ### Confused on Exponential PDF

Hi, I am a bit confused on the Exponential prob density function. I am clear on a simple problem involving a poisson arrival mechanism and how to...

• Replies: 0
• Views: 1,866
05-28-2006, 04:13 AM
5. ### Hypothesis Testing Problem

Hi again. I have a quick question regarding hypothesis testing. Below is the question that I'm working on: On a national standardized reading...

• Replies: 3
• Views: 7,110
05-29-2006, 09:13 AM
6. ### Confused on Exponential PDF

Hi, I am a bit confused on the Exponential prob density function. I am clear on a simple problem involving a poisson arrival mechanism and how to...

• Replies: 0
• Views: 2,010
05-30-2006, 01:07 AM
7. ### Large Sample Tests

I need help with this question. Can anyone help explain how the answers below were obtained. Thanks in advance. The frequency distribution of...

• Replies: 0
• Views: 2,522
05-30-2006, 01:47 PM
8. ### Confidence Intervals

Hello. Can someone explain to me the factors that affect the width of confidence intervals? I know that N size affects it, but what about the...

• Replies: 0
• Views: 2,990
05-30-2006, 03:35 PM
9. ### hmwk problem - need help

One day, it suddenly occurs to you that students at Western seem to be taller than the national average, which you know to be 66 inches. To test your...

• Replies: 1
• Views: 1,633
05-31-2006, 12:10 PM
10. ### 2 Problems - HELP!!!

:confused: new to this whole stats thing , and ive been going over these 2 questions for ages and cant come to a conclusion , someone plz help ,...

• Replies: 0
• Views: 2,371
06-02-2006, 03:13 AM
11. ### Coefficients Intervals

Hello people, I need ideas about this question: let x1,x2,...,xn be a random sample: x1,x2,...,xn ~ N(myu, sigma^2) ( myu is known ) and let...

• Replies: 0
• Views: 1,650
06-02-2006, 03:56 PM
12. ### division problem

Pourpose: I need the solution for a problem in my B. tech project. Hi all, I have 'n' numbers between 0 and 1 .... and there sum 'S' is known...

• Replies: 0
• Views: 2,264
06-05-2006, 01:45 AM
13. ### Z Vlaue Formula

Hello: I am currently working on a homework assignment. I have done most of the work, but I need some proofread. Are my z values correct? Do I...

• Replies: 2
• Views: 3,592
06-06-2006, 12:08 PM
14. ### Need help with manova

Can someone please explain what a manova is and give an example of 2x3 design? Also, would a study comparing anxiety and depression (2 dependent...

• Replies: 0
• Views: 2,574
06-06-2006, 08:39 PM
15. ### confidence interval

I have a project that i have to present to the class before our teacher teaches the material, and hopefully someone can help me out. You surveyed...

• Replies: 1
• Views: 2,971
06-06-2006, 11:02 PM
16. ### factor analysis of single item variables possible?

Hi everyone, I am extremely rusty in my stats know-how. Is it possible to correctly interpret a factor analysis of variables that are each...

• Replies: 0
• Views: 4,248
06-10-2006, 11:36 PM
17. ### Solve for Z

Hi all, I cant get my head around how to rearange this formula so as to solve for z. Can someone help please? A set by step would be good not...

• Replies: 0
• Views: 2,244
06-11-2006, 03:03 AM
18. ### Need to clarify something

I wanted to do a project on ethnicity in the different states of the U.S. Like whether one ethnicity prefers to go towards a certain region more. I...

• Replies: 0
• Views: 1,949
06-11-2006, 06:12 AM
19. ### Interaction Effect Test Methods

Hie, i would like to test interaction effect for my moderator variable (personality type - in total 9 types) on the independent variables (stressors...

• Replies: 0
• Views: 2,743
Nee
06-12-2006, 01:15 PM
20. ### Regression

hi people, I have an exam coming in a couple of weeks and I am stuck with this one....: let y=b0+b1x+E a linear regression model. the linear...

• Replies: 0
• Views: 1,966
06-12-2006, 03:39 PM
21. ### p-value help

Hi there. I need help with a question assigned to me about p-values. The problem is: A company advertises that its fuel additive will improve gas...

• Replies: 1
• Views: 1,780
06-12-2006, 11:23 PM
22. ### question about surveys for conservation program?

Hello, I am running a survey for a marine conservation program an was hoping to get some help on how to analyse the results. I am running a marine...

• Replies: 0
• Views: 1,883
06-13-2006, 04:56 AM
23. ### Hypothesis testing w/ equality of variances F distribution

For example when we have a equality of variances (with the F DISTRIBUTION), against a 2 sided test, H: O^2=O^2 against that the variances that are...

• Replies: 0
• Views: 2,695
06-13-2006, 03:34 PM
24. ### Stats dummy needs help!!

I am wanting to prove an objective that an event happened near 100%. I have a random sample of 60. Total population is 1,000. Any help would...

• Replies: 0
• Views: 1,972
06-13-2006, 03:47 PM
25. ### I'm so lost on population variances!!

Hello, Suppose a company is making a product. They want a maximum variance of .0001 inches. Assume a sample size of 15 products has a standard...

• Replies: 0
• Views: 1,920
06-13-2006, 08:55 PM
26. ### Reliability analysis

Hi, i have a test with only 5 dichotomous items. the test has been given to 25 people. Its avery easy test with the mean of 4.32 out of 5 and...

• Replies: 0
• Views: 4,362
06-14-2006, 11:07 AM
27. ### Basic stats!!!

Hi there, I need some advice on simple stats which I am taking up again (after ten years!) in the context of a study that involves a test...

• Replies: 4
• Views: 3,456
06-14-2006, 10:56 PM
28. ### MGF and Maximum Likelihood Estimation - need help!

Hi all, I'm new to the forums and delighted to have discovered this website! I am currently studying for a Higher Certificate in Statistics and...

• Replies: 1
• Views: 3,176
06-15-2006, 11:57 PM
29. ### Regression question

If I have two IV's, A and B and a third IV, C which is the sum of A and B - in general is fitting C equivalent to fitting A and B? For a set of...

• Replies: 0
• Views: 2,321
06-19-2006, 10:48 AM

Hi. Cool forum btw - just what I need! :) I have agonised over this for while. I have two lots of questionnaire data - for one study this is...

• Replies: 9
• Views: 3,412
06-19-2006, 10:07 PM
31. ### Random effects results using LME in R

Hi. Anyone know how to interpret the Random Effects results below I get from a LME analysis using the R stats package? Thanks...

• Replies: 0
• Views: 3,508
06-21-2006, 10:54 AM
32. ### Test to use for series comparison

I have a silly example to illustrate something that I am looking into, but I don't want to give up what I'm after just yet. So indulge the stupidity...

• Replies: 0
• Views: 2,437
06-21-2006, 02:17 PM
33. ### Nonparametric tests to support parametric tests

hi people, i am new here so excuse my 'innocence' in statistics. I was wondering if someone could tell me if i am on the right track. In my...

• Replies: 3
• Views: 7,569
06-21-2006, 11:00 PM
34. ### randam variable problem

• Replies: 0
• Views: 3,783
06-22-2006, 06:46 AM
35. ### Regression: When the intercept is zero.

Hi, When the intercept is zero y= bx + e How do i plot the value of sum of squares function for enough values of the sllope parameter in the...

• Replies: 0
• Views: 4,365
06-24-2006, 08:25 PM
36. ### parametric vs non-parametric 4 beginners

Hi. Hopefully simple analysis that I've been staring at for so long I've forgotten the basics. Masters research in medicine. 28 patients, each...

• Replies: 1
• Views: 2,971
06-24-2006, 10:53 PM
37. ### Not the standard Power Calculation for Regressions?

With 3 predictors, 120 items and total R^2 of 0.48, my analysis has adequate power using the standard power calculation that uses effect size, sample...

• Replies: 0
• Views: 2,172
06-26-2006, 04:16 AM
38. ### Validity

:confused: Ok, I hope you guys can help me again. Last time you were a BIG help. I feel like this is a stupid question, but I am just not getting...

• Replies: 2
• Views: 3,853
MLS
06-26-2006, 10:37 AM
39. ### completely randomized ANOVA

Forty eight subjects were randomly assigned to one of 4 treatment conditions in a study of different methods of coping with statistics exam anxiety....

• Replies: 1
• Views: 3,317
06-26-2006, 03:04 PM
40. ### Linear Regression

hello, I need a help understanding what to do here: let the linear model be: y=b0+b1x+w ( b0 and b1 refers to beta0 and beta1, while w...

• Replies: 1
• Views: 2,640
06-26-2006, 03:16 PM
41. ### adjusted residuals or standardized residuals?

Hi, I am performing chi-square analyses for my dissertation data and am wondering about appropriate "post-hoc" analyses when chi-square values are...

• Replies: 2
• Views: 15,136
06-27-2006, 03:58 PM
42. ### Simplifying variance and standard deviation formulas

I am having a problem figuring how to simplify the std variation formula and variance formula. I need to figure what I would use in place of X, in a...

• Replies: 1
• Views: 11,529
06-28-2006, 04:52 PM
43. ### Likert scale testing

I've got a likert scale: 1 2 3 4 5 I want to proof that a significant amount of respondents filled out 3 > How do I test this? I know how...

• Replies: 0
• Views: 2,843
06-28-2006, 05:37 PM
44. ### Gray Paths in LISREL

Hi all, I'm wondering if anyone can tell me what the gray paths mean in LISREL. I've looked and looked, and I can't find an answer! No matter...

• Replies: 1
• Views: 2,441
06-28-2006, 05:41 PM
45. ### Am I doing this ANOVA right?

Hi, although I am doing graduate work I am totally new to stats and its doing my head in! Please try to answer in plain english! I am planning...

• Replies: 1
• Views: 1,718
06-29-2006, 05:23 PM
46. ### mean & std deviation

I am getting lost on this for some reason, Heres the problem: Find the mean and standard deviation of the given frequency table: Age...

• Replies: 3
• Views: 2,307
06-30-2006, 10:31 PM
47. ### hierarchical regression

Hi all. I hope someone can help me because stats is definitely not my thing. I am trying to analyze some of my data for a paper and am a little...

• Replies: 3
• Views: 4,046
07-05-2006, 10:46 AM
48. ### Sample Standard Deviation

I was given a population standard deviation but i need to find the sample standard deviation from it. My mean is 12 My st. dev is .11 My sample...

• Replies: 0
• Views: 3,663
07-05-2006, 02:01 PM
49. ### .05 level of significance?!!!

can someone please help me out? i just need the formula. i have no idea how to even start this problem! =( once i can figure out values for X then i...

• Replies: 0
• Views: 7,042
07-06-2006, 02:12 PM
50. ### Help!!!!!!

I have been trying to figure out these problems all week and the assignment is due tomorrow! I went to the on campus tutoring center and they...

• Replies: 0
• Views: 2,322
07-06-2006, 07:58 PM
51. ### Residuals

I am working on Chapter 5 of my dissertation, and I want to make sure that I am right about this. My questions concerns residuals in my crosstab...

• Replies: 0
• Views: 4,331
07-07-2006, 01:15 PM
52. ### Residuals

I am working on Chapter 5 of my dissertation, and I want to make sure that I am right about this. My questions concerns residuals in my crosstab...

• Replies: 0
• Views: 3,140
07-07-2006, 01:30 PM
53. ### parametric or non parametric?

Hi, I need a help. # 1 I tested the two same product but different brand for normality and i found out that the one is normal and the other...

• Replies: 0
• Views: 1,972
07-08-2006, 09:58 AM
54. ### Homework Help

I need help with the following problem. Find a value so that ( z > - 1.00 ) and 15 % of the area under the standard curve. If the normal...

• Replies: 0
• Views: 2,247
07-08-2006, 03:04 PM
55. ### Help Pls

a production line is considered "out of control" when its hourly output falls more than two standard deviations below the mean hourly output for the...

• Replies: 0
• Views: 1,945
07-09-2006, 03:35 PM
56. ### help

the following table states the median price of new, privatley owned , single-family houses sold last year: overall \$112,500 Region A \$149000 ...

• Replies: 0
• Views: 1,994
07-09-2006, 03:49 PM
57. ### how to analyze born dead data

My question is basically how to analyze data that is not normally distributed not satisfies assumption of homogenous variance. Data looks kinda of...

• Replies: 0
• Views: 2,007
ron
07-09-2006, 07:50 PM

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