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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: 197,230
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)...

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• Views: 66,999
09-30-2005, 09:44 AM

Hi! For my master thesis I need to do a lot of statistics: I have done behavioural and acoustic research on a group of 8 captive dolphins. A...

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• Views: 1,719
02-06-2007, 05:54 AM
2. homework help

I have to conduct a mann whitney test but i have a small amount of data, it keeps telling not enough data. Help please kala:shakehead

• Replies: 0
• Views: 2,887
02-05-2007, 03:15 PM
3. variance in regression

Hi, Can someone help me fugure this out regarding simple linear regression. Firstly B is beta and A is alpha We are told that y = A + Bx + e...

• Replies: 0
• Views: 5,019
02-05-2007, 12:50 PM
4. standard error of ratio of coefficients

hi all, I am interested in the ratio of two regression coefficients. Is it possible to obtain a standard error for such a ratio? eg: I...

• Replies: 2
• Views: 11,089
02-05-2007, 12:48 AM
5. Sample variance s^2?

Can anyone give me a definitive description of s^2, sigma^2 and sxx for regression? I know that we can obtain an estimate of the true population...

• Replies: 1
• Views: 3,961
02-05-2007, 12:30 AM
6. non-parametric

Help please I need to provide a non parametric test with two independant samples the wilcoxon is the wrong test and there is not enough data for...

• Replies: 2
• Views: 2,681
02-04-2007, 07:37 AM
7. Uncertainty analysis

Hello everybody, I'm not sure whether this is the right place to ask, but I will try my luck here. This question concerns uncertainty...

• Replies: 0
• Views: 2,339
02-04-2007, 04:33 AM
8. not sure what to do! multiple DVs

Hi there I have a data set which includes 6 continuous DVs (job satisfaction, 3 different kinds of commitment and work-life conflict) and 1...

• Replies: 0
• Views: 1,575
02-03-2007, 06:54 PM
9. Estimating Proportions

Does anyone know any good sites fro explaining estimating proportions? I am clueless as to how to do this. My notes are not helping me. Is there a...

• Replies: 2
• Views: 2,439
02-02-2007, 09:51 PM
10. Standard deviation for a binomial distribution

There are N boxes which can be empty or filled with balls. The probability of filling each box with a ball is p. According to binomial...

• Replies: 0
• Views: 1,777
02-02-2007, 09:39 PM
11. Contingency Tables

I am doing AS Level Statistics, i just finished S1 and started doing S2 however, my teacher is not that experienced at teaching A level, so...

• Replies: 1
• Views: 5,986
02-01-2007, 11:04 PM
12. calculating means and standard deviation from confidence interval

Is there anyway to calculate mean and standard deviation if we are given the 95% confidence interval? I have the following interval 1.339-13.833 I...

• Replies: 2
• Views: 57,172
01-31-2007, 05:53 PM
13. Principal Components Analysis

Can somebody confirm whether the variables used in a Principal Components Analysis, such as on SPSS, ALL need to be interval level? I have 2...

• Replies: 1
• Views: 4,568
01-31-2007, 10:24 AM
14. Measure of representativeness

Suppose I have State | Sample | Population s1 | n1 | N1 s2 | n2 | N2 .. | .. | .. Is the correlation between (n1 n2 ..) and (N1 N2 ..) a...

• Replies: 0
• Views: 3,491
01-31-2007, 06:25 AM
15. 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: 2,314
01-30-2007, 09:59 PM
16. 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: 2,328
01-30-2007, 06:47 PM
17. 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: 3,774
01-30-2007, 02:42 PM
18. 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: 4,531
01-30-2007, 11:17 AM
19. 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: 4,756
01-29-2007, 11:02 PM
20. 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: 11,073
01-29-2007, 09:16 PM
21. 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: 5,130
01-28-2007, 09:58 PM
22. 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: 1,929
01-28-2007, 05:42 PM
23. 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: 2,937
01-28-2007, 05:01 PM
24. 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: 5,465
01-28-2007, 04:34 PM
25. 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: 2,359
01-28-2007, 03:27 PM
26. 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: 3,266
01-28-2007, 02:57 PM
27. 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: 4,241
01-28-2007, 02:27 PM
28. 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: 9,361
01-28-2007, 11:24 AM
29. 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: 4,558
01-28-2007, 07:34 AM
30. 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: 1,988
01-27-2007, 06:30 PM
31. 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: 2,326
01-27-2007, 06:27 PM
32. 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: 2,268
01-27-2007, 06:13 PM
33. 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: 2,700
01-27-2007, 06:02 PM
34. 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: 2,816
01-27-2007, 09:28 AM
35. 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: 21,069
01-27-2007, 02:17 AM
36. cdf

can anyone help me with a cdf question?

• Replies: 1
• Views: 2,337
01-27-2007, 01:32 AM
37. 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: 2,663
01-26-2007, 03:41 PM
38. solution

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

• Replies: 0
• Views: 2,670
01-24-2007, 01:24 AM
39. 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: 2,018
01-22-2007, 09:53 AM
40. 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: 7,237
01-19-2007, 08:38 AM
41. 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: 5,434
01-19-2007, 04:36 AM
42. 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: 2,374
01-19-2007, 12:08 AM
43. 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: 1,999
01-18-2007, 02:05 PM
44. clustrig

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

• Replies: 1
• Views: 2,830
01-18-2007, 09:23 AM
45. 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: 2,671
01-18-2007, 06:43 AM
46. 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: 2,613
01-18-2007, 05:04 AM
47. 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: 3,070
01-17-2007, 07:37 PM
48. 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: 9,707
01-17-2007, 05:48 PM

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: 3,522
01-17-2007, 10:55 AM
50. 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: 6,887
01-17-2007, 07:26 AM
51. Need help to this statistic question

what are the criteria for a good measure of spread?

• Replies: 0
• Views: 2,689
01-17-2007, 12:53 AM
52. 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: 2,158
01-16-2007, 10:36 PM
53. 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: 2,752
01-16-2007, 06:20 PM
54. 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: 2,561
01-16-2007, 06:08 PM
55. 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: 2,604
01-16-2007, 05:42 PM
56. 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: 3,274
01-16-2007, 10:59 AM
57. 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: 1,948
01-15-2007, 12:29 PM
58. 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: 3,175
01-13-2007, 09:57 AM

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