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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: 197,237
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: 67,003
09-30-2005, 09:44 AM
1. Adjusting regression for finite populations

I have a sample of 150 from a population of 300, so when deciding whether a variable is significant in a regression I need to use a finite population...

• Replies: 0
• Views: 2,699
07-28-2006, 04:58 AM
2. Comparing multiple subject groups

Hi all! I have a question regarding the analysis of some of my dissertation data. Briefly, I have data for a number of biomechanical variables...

• Replies: 0
• Views: 3,178
07-26-2006, 02:27 PM
3. exam review HELP!!!

The question is: Mr. Brown recently purchased 100 randomly selected machine scres with a defective rate of 10%. What is the probability that he...

• Replies: 0
• Views: 2,584
07-26-2006, 01:14 AM
4. Chi-squared Goodness of Fit Questions

Hi folks, A request for some basic help with Chi-squared testing: Say we have two different Likert samples (strongly agree, agree, neutral,...

• Replies: 5
• Views: 6,769
07-24-2006, 07:00 AM
5. Confused about my data file

I have conducted a pilot study on two individuals (Likert data). These individuals completed a survey, every three days for 8 weeks. Their data looks...

• Replies: 4
• Views: 2,733
07-23-2006, 01:27 AM
6. Is there software that includes post hoc tests for nonparametric data?

Hello all, I have used the Kruskal-Wallis nonparametric test to identify if there are differences among groups. The p-value was 0, meaning there...

• Replies: 0
• Views: 5,555
07-22-2006, 05:01 PM
7. one sample t test (beta=0)

Hello. I have a dumb question about one sample t test. If I want to test the hypothesis: beta=0 , what is the formula for the t statistic? Is it:...

• Replies: 1
• Views: 6,700
07-22-2006, 04:37 PM
8. Q1 and Q3 determination from QD and MEAN

Hi i have a problem. and i m not sure how to solve it. my question is that there are two Quartiles Q1 and Q3, their QD = 12.6 and the mean is...

• Replies: 3
• Views: 3,764
07-19-2006, 06:13 AM
9. Extracting an elusive sigma

Can anyone help me please? I have a tubular vertical screw-elevator, a new invention! I would like to make some conclusions regarding the...

• Replies: 0
• Views: 2,155
07-18-2006, 04:51 PM
10. Cronbachs Alpha

Okay, so I'm a student and have to calculate the reliability of a test, I have the test devided into it's various measures - only one (containing 13...

• Replies: 1
• Views: 2,696
07-15-2006, 07:44 PM
11. Confidence Interval Help

I am really stumped on this one: In a sample of 400 seeds, 240 germinated. Estimate the true germination rate with a 90% and 99% confidence...

• Replies: 1
• Views: 2,646
07-13-2006, 04:03 PM
12. Mahalanobis distance

Hi all, In the table of critical values for Mahalanobis distance, there is "number of variables" and "critical value". My question is, does "number...

• Replies: 0
• Views: 6,155
Nin
07-11-2006, 01:00 AM
13. Hierarchical regression

Hi all, Just have a quick question regarding hierarchical regression. Hypothetical example: DV: happiness IV 1: age (entered in first block)...

• Replies: 0
• Views: 2,582
Nin
07-11-2006, 12:46 AM
14. Likert Scale Analysis

Hello all, I am looking to apply a statistical test to some Likert data. My survey responses were scaled 1 to 5 (strongly disagree to strongly...

• Replies: 4
• Views: 50,593
07-11-2006, 12:00 AM
15. Homework problem

I need help with part C of this problem. Here is what I have done so far: Suppose that the weights of adult bull mastiffs are normally...

• Replies: 3
• Views: 3,160
07-10-2006, 10:32 AM
16. 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: 2,012
ron
07-09-2006, 07:50 PM
17. 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: 2,000
07-09-2006, 03:49 PM
18. 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: 1,956
07-09-2006, 03:35 PM
19. 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: 2,258
07-08-2006, 03:04 PM
20. 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: 1,977
07-08-2006, 09:58 AM
21. 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: 3,151
07-07-2006, 01:30 PM
22. 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: 4,344
07-07-2006, 01:15 PM
23. 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: 2,331
07-06-2006, 07:58 PM
24. .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: 7,082
07-06-2006, 02:12 PM
25. 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: 3,687
07-05-2006, 02:01 PM
26. 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: 4,060
07-05-2006, 10:46 AM
27. 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: 2,318
06-30-2006, 10:31 PM
28. 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: 1,723
06-29-2006, 05:23 PM
29. 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: 2,453
06-28-2006, 05:41 PM
30. 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: 2,867
06-28-2006, 05:37 PM
31. 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: 11,558
06-28-2006, 04:52 PM
32. 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: 15,169
06-27-2006, 03:58 PM
33. 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: 2,655
06-26-2006, 03:16 PM
34. 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: 3,327
06-26-2006, 03:04 PM
35. 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: 3,866
MLS
06-26-2006, 10:37 AM
36. 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: 2,180
06-26-2006, 04:16 AM
37. 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: 2,986
06-24-2006, 10:53 PM
38. 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: 4,386
06-24-2006, 08:25 PM
39. randam variable problem

• Replies: 0
• Views: 3,798
06-22-2006, 06:46 AM
40. 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: 7,608
06-21-2006, 11:00 PM
41. 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: 2,443
06-21-2006, 02:17 PM
42. 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: 3,521
06-21-2006, 10:54 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: 3,416
06-19-2006, 10:07 PM
44. 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: 2,327
06-19-2006, 10:48 AM
45. 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: 3,191
06-15-2006, 11:57 PM
46. 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: 3,481
06-14-2006, 10:56 PM
47. 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: 4,374
06-14-2006, 11:07 AM
48. 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: 1,928
06-13-2006, 08:55 PM
49. 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: 1,976
06-13-2006, 03:47 PM
50. 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: 2,713
06-13-2006, 03:34 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: 1,889
06-13-2006, 04:56 AM
52. 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: 1,784
06-12-2006, 11:23 PM
53. 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: 1,981
06-12-2006, 03:39 PM
54. 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: 2,756
Nee
06-12-2006, 01:15 PM
55. 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: 1,955
06-11-2006, 06:12 AM
56. 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: 2,257
06-11-2006, 03:03 AM
57. 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: 4,270
06-10-2006, 11:36 PM
58. 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: 2,984
06-06-2006, 11:02 PM
59. 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: 2,583
06-06-2006, 08:39 PM

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