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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: 197,315
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: 67,061
09-30-2005, 09:44 AM
1. ### Relationship between Two Varibles: Finding the Covariance, Correlation, and IQR

Eight randomly selected students who completed a course in Statistics were asked (1) the number of months between when they finished Algebra and...

• Replies: 10
• Views: 2,176
01-26-2013, 07:38 PM
2. ### Correction of p-value for multiple testing - What's my value of 'n' in Bonferroni?

Hey everyone! I have a statistical question you might be able to help me with. I hope all the terms I use are correct and it's understandable...

• Replies: 0
• Views: 1,524
01-26-2013, 01:20 PM
3. ### Correct test (z-test?) for differences in replicated, log-normally distributed data

Hi there, I can't seem to determine the correct test to use, after searching through forum posts with similar but not quite the same type of data. ...

• Replies: 0
• Views: 1,291
01-26-2013, 12:22 PM
4. ### Mediation when the independent variable is a moderator (interaction) variable

Hello, I have a simple question for which I could not find an answer on internet. I have a simple X-Y-Z mediation model. However X variable is an...

• Replies: 0
• Views: 1,178
01-26-2013, 09:41 AM
5. ### Anderson-Darling Normality Test

Hi all, I am not big with statistics or excel, so forgive me if I ask basic and simple questions. I have a macro set up in excel '07 to...

• Replies: 3
• Views: 6,203
01-26-2013, 07:41 AM
6. ### help with t.test (equal or unequal variances)

Hi all, I am trying to better understand how the t.test works. I obtained extremely different results if I used the R's t.test with or without...

• Replies: 5
• Views: 2,279
01-26-2013, 07:09 AM
7. ### How to compute a measure of the similarity of products

Hi, I'm trying to the compare the overall similarity of alternative products to a baseline product. Each product has 5 measurable attributes...

• Replies: 5
• Views: 1,467
01-26-2013, 06:39 AM
8. ### How do I solve this?

Hi all. First post here. I work in accounting and would like to apply some statistics to help solve an issue. We use a standard costing...

• Replies: 0
• Views: 1,129
01-25-2013, 11:01 PM
9. ### Comparing subpopulations in a single sample

This involves a single sample with individuals in that sample working in areas (no worker can be in two different areas). What I want to tell is if...

• Replies: 6
• Views: 1,957
01-25-2013, 10:03 PM
10. ### Mcnemar's test for dichotomous IV vs. dichotomous DV: how pertinent is it?

I intend to study the effect of a given psychological intervention (dichotomous independent variable) on the compliance of a medical treatment...

• Replies: 2
• Views: 2,213
01-25-2013, 05:06 PM
11. ### levene's test

Hallo all, I normally do levene's test with a statistical program, however I would like to know how I can do this manually. The problem is that I...

• Replies: 0
• Views: 1,924
01-25-2013, 03:55 PM
12. ### short percentile question

I need to find the 10th percentile and 90th percentile from 60 numbers. I know I have to set up numbers so its low to high. Afterwards, if it is...

• Replies: 3
• Views: 2,195
01-25-2013, 10:06 AM
13. ### Short question, not sure how to title

3. Suppose that final grades in a statistics course are normally distributed with a mean of 72 and a standard deviation of 5. a. What range of...

• Replies: 3
• Views: 1,153
01-25-2013, 09:29 AM
14. ### Sample Sizing, Statistical Significance and Variance

Hey Everyone, I'm not a stat student. I run websites, and part of my job is testing different versions of websites against one another to see...

• Replies: 1
• Views: 1,514
01-25-2013, 05:38 AM
15. ### Realy need hellp with type1 and type2 error problem

The quality control manager in a chip manufacturing plant has to select one of two available quality control methods. The estimated error rates for...

• Replies: 2
• Views: 3,239
01-25-2013, 04:04 AM
16. ### LOF: Identifying Density-Based Local Outliers by Markus M. Breunig - quick question

LOF: Identifying Density-Based Local Outliers by Markus M. Breunig I am implementing this method. I have it completed but i am unsure of the...

• Replies: 0
• Views: 2,605
01-25-2013, 03:40 AM
17. ### Derive formula for determining sample size?

Hi everyone, I just have a problem from a exercise question and hopefully someone can help. Q: Derive the formula for determining the sample size...

• Replies: 1
• Views: 3,453
BGM
01-25-2013, 01:34 AM
18. ### t-Test help: Two-Sample - Difference between assuming equal vs. unequal variances?

Hello all, I'm needing some help here. I'm trying to figure out whether or not my statistics problem would use the "t-Test: Two-Sample...

• Replies: 7
• Views: 76,651
01-25-2013, 01:15 AM
19. ### Chi Square, Likert Scale, and Within Group - reasoning

I am hoping some really smart folks can answer this question for me and provide some sage and learned advice to help me finish the last piece of my...

• Replies: 0
• Views: 4,247
01-24-2013, 01:06 PM
20. ### Statistics- Confidence Interval Estimator

I have a question which I am stuck on. I have tried to solve it but am quite wary if I am heading in the right direction. The question is as follows:...

• Replies: 7
• Views: 2,409
01-24-2013, 11:39 AM
21. ### Am I using Chi-square appropriately for eating/not-eating in three treatment groups?

I wish to analyse animal behaviour. classifying behaviour into eating and not-eating, for which I have observed each animal every minute for two...

• Replies: 2
• Views: 1,290
01-24-2013, 11:19 AM
22. ### Regularized incomplete beta + continued fraction

As per my understanding, regularized beta function is the CDF of beta distribution. In ms_xls (msoffice 2010) there is a standard method BETA.DIST(x,...

• Replies: 0
• Views: 1,036
01-24-2013, 08:25 AM
23. ### Calculated Expected Value using property and Correlation!

Hi, I have done the calculations, but want to see if I have answered the question correctly. "Let U and V be independent random variables with...

• Replies: 3
• Views: 1,763
BGM
01-24-2013, 04:55 AM
24. ### Why the value of skewness is different from excel? what's the formula using in Stata?

hi: i used the "summarize" command and got the following results: Percentiles Smallest 1% -.2483944 -.2555543 5% -.1318041 -.2555543...

• Replies: 0
• Views: 2,058
01-23-2013, 07:49 PM
25. ### Variance of a sum of binomiali random variables

Let Y be the sum of n random varables iid ~bin(1,p). How does one calculate Var(Y/n)? I started by finding E(Y/n) = p. How to calculate E(Y^2)?

• Replies: 1
• Views: 1,836
01-23-2013, 05:56 PM
26. ### Computing the mean incrementally using subsets

Hi, I am tackling a problem: There is a set M containing real numbers. The goal is to compute the mean of values in M. The algorithm is as...

• Replies: 0
• Views: 1,057
01-23-2013, 05:08 PM
27. ### Yellow diamonds in the sky

hi could any of you pls help me with the following question. pls try and explain each step bcos m doin maths after 3 years. thanx. The random...

• Replies: 1
• Views: 1,068
01-23-2013, 02:11 PM
28. ### Tail Value at Risk of a bounded single parameter Pareto distribution, L<x<H.

Hello I am having some difficulties calculating the Tail Value at Risk of the bounded single parameter Pareto distribution, L<x<H. Do you have...

• Replies: 0
• Views: 2,112
01-23-2013, 01:39 PM
29. ### How to calculate significant differences

Hi Everyone.. I am stuck on one of my assignment questions. I have two samples, let's say List of employees in one Department A each with an...

• Replies: 7
• Views: 2,771
01-23-2013, 12:55 PM
30. ### How do you do an F-test for R-square

Hi, How do you do an F-test to test significance of R-square in EXCEL? I have done a linear regression and get R-square = 0.412, how can I test if...

• Replies: 10
• Views: 32,765
01-23-2013, 08:58 AM
31. ### [SOLVED] Need some Help on my TI84

Sorry if this is not the place to post it. But I am trying to get to the list where I can see X Min X Max S SCL Y Min Y Max y Scl Graph.

• Replies: 3
• Views: 2,208
01-23-2013, 04:19 AM
32. ### Calculating Conditional Expectation

edit: nevermind

• Replies: 1
• Views: 840
01-23-2013, 12:40 AM
33. ### Alternatives to two-way tables

Are there any alternatives to two-way tables that show a higher level of understanding? If you know some, could you please detail and explain how...

• Replies: 1
• Views: 1,050
01-22-2013, 03:21 PM
34. ### The most suitable ARMA Tool for forecasting?

what is the most appropriate trial software tool for building an ARMA forecasting model? I need to build forecasting model using historical data...

• Replies: 6
• Views: 1,497
01-22-2013, 02:36 PM
35. ### ANOVA - one-way vs repeated measures? or both?

What is the best way to analyze this data please? I have 2 groups (treatment group, control group) and 2 time points for each group (day 0, day 1,...

• Replies: 2
• Views: 1,705
01-22-2013, 12:35 PM
36. ### Time Series Noob

Hey guys, first time posting here, hopefully someone can help me. Let {Z_{t}} be an IID sequence with mean 0 and variance \sigma^2. (I think this...

• Replies: 2
• Views: 966
01-22-2013, 10:00 AM
37. ### how can I evaluate chi-square CDF?

Hello, I want to know how can I evaluate CDF of chi square by 1 degree of freedom in special point, Anybody can help?

• Replies: 3
• Views: 2,393
01-22-2013, 09:30 AM
38. ### PERMANOVA - choice of distance measure

Hi, I want to run a (PRIMER based) PERMANOVA analysis on my univariate data (output var.= weight of organisms, and 3 factors = 2 fixed, 1 random)...

• Replies: 4
• Views: 6,022
01-22-2013, 04:04 AM
39. ### Expected value of a probability density function

I was given a table that looks like this: y | f(y) ________ -1 | 0.25 0 | 0.5 1 | 0.25 And I am asked to calculate the...

• Replies: 3
• Views: 1,364
01-21-2013, 05:49 PM

Hi, I wonder if you could help me out: I try to do statistics to find out the most hit street distance in roulette.(from the real wheel) A street is...

• Replies: 2
• Views: 936
01-21-2013, 01:33 PM
41. ### Poll: which sampling methods-reply ASAP

For some statistics course work, I am investigating two hypothesis', and I am not sure which sampling method I should use. They hypothesis' are: the...

• Replies: 4
• Views: 1,524
01-21-2013, 12:03 PM
42. ### Looking for health care fraud example data set

Hi All, I am looking for a simple data set that includes fraud in healthcare. I need to this to work on fraud detection. I looked around...

• Replies: 3
• Views: 2,254
01-21-2013, 11:49 AM
43. ### What is a link function (in English)

In generalized linear models there are link functions. I would like if someone could explain the concept to me. Thanks!

• Replies: 1
• Views: 3,272
01-21-2013, 11:41 AM

I've assigned myself HW in trying to learn about network graphs. I got my HW from here: (LINK) Here's the 4 graphs I attempted to draw. ...

• Replies: 3
• Views: 1,714
01-21-2013, 10:24 AM
45. ### Basic statistics help?

Hey guys, I am working on my project for the STEM fair and was wondering if you could help me. I haven't taken AP Stat since two years ago and I am...

• Replies: 2
• Views: 1,571
01-20-2013, 04:52 PM
46. ### Which test to use for comparing rankings?

Hello, I have some questions about how to analyze ranked data. The data looks like this: groups of people with HIV and other groups of people...

• Replies: 4
• Views: 1,412
01-20-2013, 09:58 AM
47. ### marginal effects probit versus logit

Is there a rule of thumb for comparing the marginal effects estimated by logit versus probit based on the coefficients in mentioned models?

• Replies: 0
• Views: 1,204
01-20-2013, 09:34 AM
48. ### Which formula to use

Hi, I have 2 columns of numbers (x,y), I want to find which value in column X will give the maximum value in column Y. What formula does it?...

• Replies: 0
• Views: 917
01-20-2013, 06:59 AM
49. ### Maximum Likelihood Estimation Exercise (short)

Hi I have found the following exercise while trying to understand the Maximum Likelihood Estimation in Practice: "In a random sample of 1000...

• Replies: 5
• Views: 2,046
01-19-2013, 08:50 PM
50. ### Absolutely lost!

Hi everyone, I am trying to figure out how to solve the following problem and can't, for the life of me, understand which test I should use. My...

• Replies: 13
• Views: 2,003
01-19-2013, 07:32 PM
51. ### Help a dizzy blonde anyone??

Hey guys, I need someone to point me in the right direction on which stats tests to do for this experiment if someone would please take the time, I'd...

• Replies: 1
• Views: 1,135
01-19-2013, 04:45 PM
52. ### Undergrad struggling in dissertation statistics...

hi people, I'm working through my results and need to do some statistics to prove they are statistically significant... The first is loss on...

• Replies: 3
• Views: 1,701
01-19-2013, 02:27 PM
53. ### how to test this memory research question?

okay, say you have all races in a study. you want to test how well they recognize people of their own race. you hypothesize that whites will...

• Replies: 3
• Views: 1,447
01-18-2013, 09:31 PM
54. ### Interpreting Cointegration in Gretl

Hi all, I recently stumbled across Gretl and love its simplicity. I was wondering if anyone has any links/resources or tips to recommend in...

• Replies: 0
• Views: 3,967
01-18-2013, 03:55 PM
55. ### One-way repeated measures ANOVA - correct?

Hi. I have come to the end of a research pilot study and need to anaylse my data. I wanted to check I am doing it correct. Study: I am taking a...

• Replies: 1
• Views: 1,443
01-18-2013, 02:01 PM

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