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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: 66,929
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: 197,111
07-16-2014, 11:01 AM
1. ### Allocating Items to a Limited Number of Slots

Hi, Let's say that I have a small retail shop that has slots available for only 5 types of products. However, I also have a warehouse located...

• Replies: 0
• Views: 3,010
01-06-2007, 08:43 AM
2. ### Which Probabilty Formula?

More than 200 billion grocery coupons are distributed each year for discounts exceeding \$84 billion. However, according to a report in USA Today,...

• Replies: 1
• Views: 4,380
01-06-2007, 12:27 PM
3. ### "Use the normal approximation to the binomial distribution" help if possible?

Hello, i'm new here and i'm stuck on a question. This isn't really from my homework, as i'm just reviewing for my final which is in a week. The...

• Replies: 1
• Views: 6,005
01-07-2007, 01:10 AM
4. ### Correlation question

Hello! Suppose I have: class % persons % ill persons a 0% 0% b 0% 0% c 20% 20% d 40% 50% e 40% 30%

• Replies: 0
• Views: 2,114
01-10-2007, 09:29 AM
5. ### Any R experts? Problem here

OK, so I've looked and looked at the help on R, but I can't find a method for solving this. I have some electoral data, including the Polling...

• Replies: 0
• Views: 2,160
01-10-2007, 11:08 AM
6. ### Repeated Measures vs Mixed Model

HI I'm having trouble understanding the difference between using repeated measures and mixed model analysis. My variables are 2 x 2 x 2, however...

• Replies: 0
• Views: 3,674
01-10-2007, 04:28 PM
7. ### I need help choosing stat method!

Hi! I am hopelssly lost and I need help finding the suitable statistict to describe some resluts I have. I hope someone here can help me! I...

• Replies: 1
• Views: 1,999
01-10-2007, 05:07 PM
8. ### Where's the independent variable? (survey)

I have made a survey with a 5 point Likert scale. One section is about student perceptions of the advantages of Distance Learning. I have 10 items in...

• Replies: 0
• Views: 3,373
01-10-2007, 05:26 PM
9. ### Poll: Question about p-values

"We report the results of a statistical test (alpha=.05, two-tailed) & provide an observed p-value: t(39)=2.343, p = .024. the p-value is: a) alpha...

• Replies: 1
• Views: 1,905
01-10-2007, 05:30 PM
10. ### Significance of individual scores on t test

Hi folks, I have a question. How do I determine the significance of individual scores from dependent t test results? I did a t test with a group...

• Replies: 2
• Views: 4,161
Don
01-10-2007, 08:18 PM
11. ### Repeated Measures ANCOVA

Hello I am working with data which has a time varying covariate. Can anybody give inputs regarding the repeated measures ANCOVA and how it can be...

• Replies: 0
• Views: 3,756
01-11-2007, 11:28 PM
12. ### Nonparametric test choice for skewed data

Hello, My first thread on the board... I posted this to the SPSS-X list , but thought this forum may be more appropriate. I was wondering if...

• Replies: 8
• Views: 9,833
01-12-2007, 04:05 PM
13. ### Testing differences in variance - within subject

I have a 3 (within) X 2 (between) design. For the within-subject aspect, is it possible to statistically compare the amount of variability in one...

• Replies: 0
• Views: 3,163
01-12-2007, 04:28 PM
14. ### skewness

I am trying to find the existence of difference in achievement of boys and girls. I used Independent samples t-test but does it take care of the...

• Replies: 1
• Views: 3,137
01-13-2007, 09:18 AM
15. ### Durbin Watson

Hi, I am new here and I am a second year university student studying economics. Any help here would be great and I thank-you in advance. I am...

• Replies: 2
• Views: 3,167
01-13-2007, 09:57 AM
16. ### Survey Project I NEED HELP PLEASE Today

Develop A Question to ask in a survey, determine the variables, determine the population, determine which type of sampling you will use, think of a...

• Replies: 0
• Views: 1,944
01-15-2007, 12:29 PM
17. ### Likert Survey

I have designed a Likert Survey (5 points) that pertains to classroom management. I am trying to analyze the classroom management style of high...

• Replies: 0
• Views: 3,261
01-16-2007, 10:59 AM
18. ### Paired data or not...

Hi I'm conducting an investigation into daily water use at an establishment before and after water saving devices were installed. We have...

• Replies: 1
• Views: 2,597
01-16-2007, 05:42 PM
19. ### Statistics problems with genetic analysis

hi everyone, I'm having a bit of trouble trying to find out what to do with some results I've got in my research project. I've found 2 different...

• Replies: 1
• Views: 2,558
01-16-2007, 06:08 PM
20. ### circular statistics with weight?

Hi all, I have a dataset that describes groups of 2-D linear features. Each group is a collection of angles (orientations) and lengths describing...

• Replies: 1
• Views: 2,750
01-16-2007, 06:20 PM
21. ### is Chi squared appropriate here?

Hi, I have some survey results which I have compiled into a crosstabulation (9x4)using SPSS. I was intending to use chi squared analysis to...

• Replies: 3
• Views: 2,149
01-16-2007, 10:36 PM
22. ### Need help to this statistic question

what are the criteria for a good measure of spread?

• Replies: 0
• Views: 2,678
01-17-2007, 12:53 AM
23. ### ANOVA vs. t-test

Dear Stats talkers, What's your answer to the question when to use a t-test vs. analysis of variance? Could you also give an example case for...

• Replies: 2
• Views: 6,882
01-17-2007, 07:26 AM

Hi, I am an adult student struggling with the following: Background: A Survey of Analysts, who are used as representatives of investors in the...

• Replies: 1
• Views: 3,508
01-17-2007, 10:55 AM
25. ### sampling distribution

i have been trying to do this for while, but couldnt figure out how. AUTO ACCIDENTS A study of rush hour traffic in San Francisco counts the...

• Replies: 3
• Views: 9,679
01-17-2007, 05:48 PM
26. ### To ANOVA or not to ANOVA

That is the question. I am PhD student preparing my proposal for submittal this week, and I am still tossing around which data analysis method to...

• Replies: 2
• Views: 3,060
01-17-2007, 07:37 PM
27. ### Great data but not sure what to do with it?

Hi- I've got 25 questions, each with 6 variables in each. I want to compare 2 groups (expert v novice) on each of these questions and within each...

• Replies: 4
• Views: 2,607
01-18-2007, 05:04 AM
28. ### testing my Pearson

Hi there.. I just registered because I'm becoming desperate and I hope someone will know an answer to this one.. :) I'll make this more picturesque....

• Replies: 0
• Views: 2,668
01-18-2007, 06:43 AM
29. ### clustrig

Hai i am a pg student please explain the hirarical clustring-Aglomeritive methods thank you

• Replies: 1
• Views: 2,826
01-18-2007, 09:23 AM
30. ### Histograms

Hi all, I'm trying to determine a cut-off for my data using a histogram - but my question is what is the correct way of setting bin sizes? ...

• Replies: 0
• Views: 1,997
01-18-2007, 02:05 PM
31. ### Which technique is best?

Hi, i'm final year undergrad student and have been stuck for quite a while now. I have been provided with data on the girth measurements from 12...

• Replies: 0
• Views: 2,370
01-19-2007, 12:08 AM
32. ### Hierarchical Regression assumptions

In my study, i would like to use hierachical regression, but I can't find a proper book on the assumptions that should be met. Is is true that the...

• Replies: 2
• Views: 5,426
01-19-2007, 04:36 AM
33. ### Unweighted and Weighted Data (Chi Square)

Here's my situation: I have a dataset with unweighted data taken from a small, annual survey. I also have a large dataset with weighted and...

• Replies: 0
• Views: 7,223
01-19-2007, 08:38 AM
34. ### Multinomial problem

I have five possible values (1-5) that are to be applied to categories regarding the likelihood, severity, etc, of systems problem events. There are...

• Replies: 0
• Views: 2,014
01-22-2007, 09:53 AM
35. ### solution

does anyone know how to get hold of the solution manual for textbook "Engineering Statistics" 3rd edition by Montgomery

• Replies: 0
• Views: 2,667
01-24-2007, 01:24 AM
36. ### Classification of Insects (How to develop a method?)

I've been trying this Moody's Mega Math Challenge sample problem, but I don't quite know where to begin. I only have experience in Statistics up to...

• Replies: 0
• Views: 2,655
01-26-2007, 03:41 PM
37. ### cdf

can anyone help me with a cdf question?

• Replies: 1
• Views: 2,331
01-27-2007, 01:32 AM
38. ### how to prove E(Σei^)=ΣE(yi^)-E(Σyihat^)

this formula looks simple but i really don't know how to explain mathmatically E(Σei^)=ΣE(yi^)-E i tried putting E(Σei^)=E but then don;t know how...

• Replies: 1
• Views: 21,060
01-27-2007, 02:17 AM
39. ### Help please - in middle of brain me***own!!

I am putting together a my research proposal on Chinese Herbs (as you can already see, statistics and I do not have much in common!). I have plowed...

• Replies: 1
• Views: 2,808
01-27-2007, 09:28 AM
40. ### Awerage growth rate (3 years) - which method?

Hello! I am intending to perform independent samples T Test, between two groups of companies in comparing average annual growth rate in years...

• Replies: 1
• Views: 2,686
01-27-2007, 06:02 PM
41. ### Multivariate Regressions

I have temperature data from two different sites, and I want to develop a relationship for temperature between those two sites. In that way, if I...

• Replies: 1
• Views: 2,259
01-27-2007, 06:13 PM
42. ### to mix or not to mix?

Hi, I am running a learning experiment in which both training subjects and controls complete a pretest and posttest. All analyses are being ...

• Replies: 1
• Views: 2,324
01-27-2007, 06:27 PM
43. ### Help!

Hi, I'm currently undergoing a project whereby I have approximately 1200 data cases. I have a number of independent variables and I would like to...

• Replies: 1
• Views: 1,981
01-27-2007, 06:30 PM
44. ### Help With My Homework!

I need help with a problem... I am trying to find the t* value by calculating the upper tail probability p I have 37 degrees of freedom and a...

• Replies: 2
• Views: 4,548
01-28-2007, 07:34 AM
45. ### hypothesis testing

I need help learning this. I know how to come up with the null and alternative statements but i don't know how to determine which one is the the...

• Replies: 1
• Views: 9,340
01-28-2007, 11:24 AM
46. ### Confidence Interval Question

I have to find a 90% confidence interval for a mean, and i'm only given the S and the x-bar for a sample population of 60. How do I find the t* for...

• Replies: 1
• Views: 4,220
01-28-2007, 02:27 PM
47. ### RARE EVENTS -- Poisson / Binomial -- Need Help

Any help with the problem below is greatly appreciated. :wave: I have 100 days of observations of a geyser. In those 100 days, the geyser shot...

• Replies: 2
• Views: 3,258
01-28-2007, 02:57 PM
48. ### Help with question

The Food and Nutrition Board of National Acadamy of Sciences states that reccomended daily allowance (RDA) of iron for adult females under the age of...

• Replies: 1
• Views: 2,355
01-28-2007, 03:27 PM
49. ### Approximating the mean and standard deviation

Hi, I just started my statistics class and I've been having a little trouple grasping it. I just don't know where to start with this and my book is...

• Replies: 0
• Views: 5,448
01-28-2007, 04:34 PM
50. ### urgent help needed with assignment

Hi guys I am in urgent need of some help with a question for an assignment due in a few hours. It involves using minitab. It goes as follows: ...

• Replies: 1
• Views: 2,931
01-28-2007, 05:01 PM
51. ### ramdomness of two independent samples

Hello! I´ve two small and independent samples and i need to confirm that they are random (one of the assumptions on the mann-whitney test), the only...

• Replies: 2
• Views: 1,927
01-28-2007, 05:42 PM
52. ### Parametric or Non-parametric Analysis with z-scores?

I last took a stats course in 1999, and I could use some help in remember options available for an analysis of z-scores. I have z-scores on 4...

• Replies: 0
• Views: 5,110
01-28-2007, 09:58 PM
53. ### Linear vs. Quadratic in Comparisons - Why?

Hello, I have a set of data for the level of antioxidants in tea, with two variables (water temperature of either 70 or 90 degrees, and steeping...

• Replies: 2
• Views: 11,056
01-29-2007, 09:16 PM
54. ### Significance

Hello, I am very happy to have found this disucssion board, and I am hoping that you folks can help me! I am the founder of a research project...

• Replies: 2
• Views: 4,739
01-29-2007, 11:02 PM
55. ### how to derive following solution for uniform distributions?

Hi, I have the following situation. In a rectangular cartesian coordinate of length L and breadth B, you choose any two points randomly (i.e. you...

• Replies: 3
• Views: 4,513
01-30-2007, 11:17 AM
56. ### Calculating mean/sd from Chi squared for power analysis

I am working on a project which utilizes several research articles in my field. The first one does not report means and standard deviations, only chi...

• Replies: 0
• Views: 3,770
01-30-2007, 02:42 PM
57. ### Expecteation and population mean

Can someone out there assist me to understand if there exist any difference between Expectation EX and Population mean "mu". I have completely lost...

• Replies: 3
• Views: 2,322
01-30-2007, 06:47 PM
58. ### Help Please Binomial Probability Distribution

Help Please Binomial Probability Distribution I am given this problem 72% of americans have online access Out of a sample of 30 people

• Replies: 1
• Views: 2,311
01-30-2007, 09:59 PM

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