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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: 66,703
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: 196,679
07-16-2014, 11:01 AM
1. ### random effects model (ANOVA)

hello there, I am struggling with the following question: "show that the error SS, for the random effects model, is the same...

• Replies: 0
• Views: 3,350
02-21-2006, 06:35 AM
2. ### unequal and unknown variances

Hi, We have a question on our homework that asks us to discuss the difficulty with unknown and unequal variances with respect to a t-distribution. I...

• Replies: 0
• Views: 2,605
03-08-2006, 06:44 PM
3. ### Stats Report

I have to write a 500 word stats report on the following data: Batch 1 Batch 2 Min Value 26.1 26.1 Q1 29.6 28.4 Median 31.2 30.3...

• Replies: 0
• Views: 2,153
03-12-2006, 07:45 PM
4. ### Principal Component Analysis

Are the sample variances of principal components always positively biased compared to population variances? I know that the first principal component...

• Replies: 0
• Views: 3,585
03-15-2006, 06:53 AM
5. ### Calculating a binomial probability

Hello, I have a distribution of observed B values that vary with x. I am fitting a distribution to this and do not have a problem with this. ...

• Replies: 0
• Views: 2,410
03-17-2006, 07:20 AM
6. ### estimate/probability

• Replies: 0
• Views: 1,803
03-19-2006, 03:22 PM
7. ### Can propensities and percentages be compared?

Hi, I'm new to the world of statistical modelling and have recently have been given a model to update. The model currently assigns a propensity...

• Replies: 0
• Views: 2,004
03-19-2006, 07:25 PM
8. ### one sample z test

Ho=mu(males)=mu(state prop.) Ha=mu(males)<>mu(state prop.) The critical Z-values for .05 is 1.96 and .01 is 2.57, respectively. State-10.47...

• Replies: 0
• Views: 1,816
03-21-2006, 04:14 PM
9. ### one sample z test

Ho=mu(males)=mu(state prop.) Ha=mu(males)<>mu(state prop.) The critical Z-values for .05 is 1.96 and .01 is 2.57, respectively. State-10.47...

• Replies: 0
• Views: 1,971
03-21-2006, 04:16 PM
10. ### F test

With this information: F-Test Two-Sample for Variances 1 0 Mean 43.4333871 48.65021053 Variance 95.63978493 159.8278372...

• Replies: 0
• Views: 1,749
03-26-2006, 10:48 AM
11. ### Help with almonds!!!

hey guys i am new here and am having trouble with this problem... Consider the market for almonds. Assume that quantity supplied is a linear...

• Replies: 0
• Views: 1,736
03-26-2006, 09:11 PM
12. ### Cochran-Armitage Trend Test

Hello. I have a question on interpreting the results of a Cochran-Armitage Trend Test. I ran the data below in SAS to see if the NH-Black...

• Replies: 0
• Views: 5,186
03-28-2006, 04:19 PM
13. ### helpz!

1) a car insurance company has determined that 8% of all ddrivers were involved in a car accident last year. among the 15 drivers living on one...

• Replies: 0
• Views: 4,961
03-29-2006, 02:27 AM
14. ### hypothesis testing question

Of a random sample of 100 families in Richmond, 60 own a house. Is there sufficient evidence at the 0.05 level of significance to conclude that most...

• Replies: 0
• Views: 2,028
04-01-2006, 05:22 PM
15. ### Help With Normal Distribution

When I am given a problem asking to find the lowest vaule in the top 20% of the test scores i can, but I didnt know if I was doing it right to find...

• Replies: 0
• Views: 1,856
04-01-2006, 05:36 PM
16. ### P-value method

I have a couple of questions I would like to know if I am doing them correctly or not, any guidence would be greatly appreciated. Test the given...

• Replies: 0
• Views: 5,928
04-02-2006, 10:25 PM
17. ### Need Help Urgently

Hey guys I need help in an assignment it is due tonight, and i am clueless about what to do the assignment is here...

• Replies: 0
• Views: 2,124
04-06-2006, 01:39 PM
18. ### Post Hoc tests - significant interaction

I'm involved in a student project that is investigating the effects of anticipation on the magnitude of the reflex muscle activity in the arm. I have...

• Replies: 0
• Views: 2,325
04-06-2006, 03:11 PM
19. ### Normal Distributions

ok, I have this one problem that I cannot figure out for the life of me. It's probably really simple, but I really just can't figure it out. Any...

• Replies: 0
• Views: 2,828
04-03-2006, 11:35 PM
20. ### Can't seem to figure this out... any help?

"A shopping center developer claims in a presentation to a potential client that at least 40% of the adult female population in a community visit the...

• Replies: 0
• Views: 2,097
04-04-2006, 01:51 PM
21. ### Please check homework problem #2

:confused: Coaching and the SAT. Suppose that SAT mathematics scores in the absence of coaching vary Normally with mean mule=475 and standard...

• Replies: 0
• Views: 4,137
04-04-2006, 03:25 PM
22. ### Example Questions for a Final

Do you have any example questions for a comprehensive final? If, so please e-mail them my final is on May 8, 06. Thanks in advance Shonna

• Replies: 0
• Views: 1,980
04-04-2006, 03:45 PM
23. ### Need help with hypothesis testing problems

Microsoft believes that if over 30% of Linux users would be interested in a particular new software package, then the company will make at least an...

• Replies: 0
• Views: 2,111
04-19-2006, 02:36 PM
24. ### How to convert a table of probabilities to j.p.d.f

Among the sudent that attempted the exams of Calculus III (CIII) and Differential Equation (DE) is oberved that the joint probability of passing or...

• Replies: 0
• Views: 2,285
04-19-2006, 05:08 PM
25. ### least regression

I am a student taking basic stats and I am not sure if I arrived at the correct answer for these could someone please let me know. Consider the...

• Replies: 0
• Views: 1,654
04-19-2006, 05:31 PM
26. ### Confirmatory factor analysis

Hi, does anyone here knows a good website that explains how to perform a confirmatory factor analysis with AMOS? Thank you, Hans

• Replies: 0
• Views: 2,483
04-23-2006, 03:18 AM
27. ### least-squares prediction

A sociologist beleives that there is a tendency for tall men to marry tall women. To determine the nature of such a relationship, the heights of the...

• Replies: 0
• Views: 2,704
04-23-2006, 01:41 PM
28. ### FACTOR ANALYSIS - POOLING data from different samples

I'm conducting an exploratory factor analysis to examine the factor structure of a translation of an established scale. There are 20 variables. I...

• Replies: 0
• Views: 2,859
04-26-2006, 06:14 AM
29. ### Confidence Int for shifted exp dist

herez the q: Let random variable X has shifted exponential distribution with density function given as follows: F(x, t) = { L exp (-L (x - @))...

• Replies: 0
• Views: 1,950
04-27-2006, 08:13 PM
30. ### Kurtosis

Hi! In LISREL, which values are we to use when discussing kurtosis, z-values or statistical values? Also, what are the difference between them? ...

• Replies: 0
• Views: 3,286
05-09-2006, 04:50 AM
31. ### What test do I use?

hi john i am trying to work out what inferential test i should use on my data. in brief my study involves looking at the effectiveness of a...

• Replies: 0
• Views: 2,241
05-13-2006, 05:59 AM
32. ### median test or 2 sample kolmogorov test ?

Hi I have the following problem: My data is generally non normal distributed and therefore I use the 2 sample Mann Whitney Test for comparisons. ...

• Replies: 0
• Views: 2,902
05-13-2006, 07:27 AM
33. ### poisson distribution

hello there, I've been staring at this question for quite some time now but to no avail :( "The discrete random variable X has a truncated...

• Replies: 0
• Views: 1,701
05-21-2006, 03:41 PM
34. ### errors??

hi there!!:wave: i have a question!im completely getting confused, what is the difference between error term, error variance, experimetal...

• Replies: 0
• Views: 2,003
05-23-2006, 02:44 PM
35. ### 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: 1,920
max
05-24-2006, 04:30 AM
36. ### 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: 2,499
05-24-2006, 01:45 PM
37. ### 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: 3,291
05-28-2006, 12:55 AM
38. ### 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: 1,853
05-28-2006, 04:13 AM
39. ### 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: 1,997
05-30-2006, 01:07 AM
40. ### 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: 2,516
05-30-2006, 01:47 PM
41. ### 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: 2,964
05-30-2006, 03:35 PM
42. ### 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: 2,360
06-02-2006, 03:13 AM
43. ### 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: 1,640
06-02-2006, 03:56 PM
44. ### 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: 2,236
06-05-2006, 01:45 AM
45. ### 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: 2,565
06-06-2006, 08:39 PM
46. ### 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: 4,222
06-10-2006, 11:36 PM
47. ### 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: 2,223
06-11-2006, 03:03 AM
48. ### 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: 1,941
06-11-2006, 06:12 AM
49. ### 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: 2,718
Nee
06-12-2006, 01:15 PM
50. ### 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: 1,945
06-12-2006, 03:39 PM
51. ### 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: 1,880
06-13-2006, 04:56 AM
52. ### 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: 2,668
06-13-2006, 03:34 PM
53. ### 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: 1,962
06-13-2006, 03:47 PM
54. ### 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: 1,908
06-13-2006, 08:55 PM
55. ### 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: 4,351
06-14-2006, 11:07 AM
56. ### 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: 2,309
06-19-2006, 10:48 AM

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