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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: 196,665
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: 66,688
09-30-2005, 09:44 AM
1. ### Average salary paid to teachers and expenditures per pupil are two commonly used

measures of tha amount of money spent on education. Pay:Amount of pay in thousands Spend:Average amount spent per student in thousands State ...

• Replies: 1
• Views: 1,238
01-28-2012, 09:36 PM
2. ### Average Tenure and Employee Attrition

Hi All, My company's attrition rate is about 25%. A senior member of the organization believes that because the attrition rate is 25%, this means...

• Replies: 0
• Views: 2,541
11-25-2012, 06:09 AM
3. ### Average vs 99.9% of samples less than

Hi I have a question that is far beyond my mathematical abilities. I work for an IT firm and I need to be able to explain the relationship...

• Replies: 3
• Views: 2,608
02-28-2008, 02:13 AM
4. ### Averages

hello, I am struggling with these two questions, would appreciate some help with it: 1. In a set of squares, the average length of a side is...

• Replies: 0
• Views: 1,148
07-04-2013, 04:16 AM
5. ### Averaging Across Subjects or Trials

Hello everyone: This is a ridiculously easy question that I'm slightly ashamed to ask but I've gotten into arguments about it with a few people...

• Replies: 0
• Views: 589
02-28-2014, 01:45 PM
6. ### Averaging Averages

Yes, I know it can be mathematically dodgy, but...I have spreadsheets of household water use data, which is given to me in AverageLiters per Day per...

• Replies: 0
• Views: 2,404
06-07-2009, 02:22 AM
7. ### averaging data but excluding spurious figures

Hi all Apologies in advance but I'm statistially naive. I have been collecting responses to questions in a number format and then need to collate...

• Replies: 2
• Views: 1,325
11-06-2014, 12:17 PM
8. ### Averaging Help

I have a list of sizes and need to get an average but I have to give the larger sizes more weight. How do I do this? Thanks.

• Replies: 4
• Views: 1,412
03-10-2014, 10:11 AM
9. ### Averaging regression coefficients for 50 regression , how to report t statistic ??

hi i have estimated same regression equation for 50 stocks, i need to report the cross sectional average of the regression coefficients, how can i...

• Replies: 3
• Views: 2,871
04-04-2013, 09:41 AM
10. ### Averge and Dispersion

Below are listed the rates of abortion per 100,000 women for 13 US states in 1973 and 1975. Describe what happened to these distributions over the...

• Replies: 1
• Views: 1,766
01-23-2012, 01:21 AM
11. ### 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: 2,645
01-27-2007, 06:02 PM
12. ### Axiom of regularity

Dear people, I was wondering what the following sentence actually means: Every non-empty set A contains an element B which is disjoint from A....

• Replies: 0
• Views: 692
02-04-2013, 10:26 AM
13. ### Back to back stem and leaf plot

Hi, I am trying to compare 2 distributions and I like the idea of back to back stem and leaf plot. Anybody knows of a software that might do that?...

• Replies: 2
• Views: 13,824
12-22-2009, 11:36 PM
14. ### Back transformation from Log transformation

Hello. I have quite big size of data(N=75000) with long tail. It appear to follow Lognormal or Gamma distribution. But not significant in...

• Replies: 0
• Views: 5,876
08-14-2009, 06:25 AM
15. ### Back transformation of p-values

Hi everybody, I am currently working with some raw data which are not normally distributed (ND). I have now transformed the data with squareroot...

• Replies: 2
• Views: 1,880
06-08-2016, 04:18 PM
16. ### Backing out standard errors on regression betas from Least Significant Differences

I'm trying to do a meta-regression analysis on the effect of a certain treatment on crop yields. There are tons of papers reporting effects, and I...

• Replies: 2
• Views: 1,936
02-24-2012, 02:09 PM
17. ### Backing up from data

Hi all, I have results from a test done several years ago, however I don't have the dataset used, and would like to back up to it (or get a...

• Replies: 0
• Views: 891
01-31-2013, 11:40 AM
18. ### Badly need assistancr L Regression

Dear JohnM, It looks everything is falling on you. I badly need assistance on this issue which I am putting up for the third time. Please help out....

• Replies: 0
• Views: 1,758
10-10-2006, 10:25 AM
19. ### balanced and unbalanced design

Please kindly help me, my project topic is "A COMPARATIVE STUDY ON BALANCED AND UNBALANCED DESIGN IN EXPERIMENTAL DESIGN" i will really appreciate...

• Replies: 4
• Views: 5,182
05-18-2011, 11:47 AM
20. ### Balancing Contribution to Data Set from Sources

Hi there, I haven't touch stats in a while, and needs a hint on the mathematical term on what it is that I am actually doing so I can further...

• Replies: 4
• Views: 2,508
05-03-2010, 02:22 AM
21. ### balls of different colors

Here is a question: A bag contains 100 balls. We randomly take 5 balls out the bag, and we find that the 5 balls have 3 different colors (e.g.,...

• Replies: 0
• Views: 830
05-01-2014, 12:56 AM
22. ### Bandwidth selection for kernel density estimation

Hi all, I'm looking to perform a kernel density estimation on a set of 40 locations. At first I used LSCV as the bandwidth, however it seems to...

• Replies: 0
• Views: 1,086
01-22-2012, 11:47 AM
23. ### Bar charts/graphs

HI everyone, I am using SPSS 14. I have multiple variables that contain information on the presence/absence on a number of subtypes of a symptom...

• Replies: 0
• Views: 2,338
06-09-2009, 03:47 AM
24. ### Bar plot, 4 nominal and 2 scale variables

Hi I want to create a special bar plot. I have four nominal variables, let's call them "Examination year", "Hospital", "Machine" and "Diagnosis"....

• Replies: 2
• Views: 1,617
10-23-2013, 06:23 AM
25. ### Bartlet and KMO

Hello everyone, I am new memeber in this site. I have a question. I would like to do exporatory factor analysys. Before doing it, it si...

• Replies: 3
• Views: 1,290
08-26-2015, 08:05 AM
26. ### baseball fun

The Atlanta Braves have a batting avg of mew = .287 with a s = .025. One of the sports trainers asked the batters to start wearing amber colored sun...

• Replies: 1
• Views: 2,296
06-30-2008, 11:30 PM
27. ### Baseline measure IV as control ok to use in regression model?

Hi there, I want to see if my independent variable (IV) induced over 1-week can predict my dependent variable (DV) over 1-week. I have also the...

• Replies: 5
• Views: 1,348
01-21-2014, 01:24 PM
28. ### Basic - Mean or median?

Hello all, Quite a basic question here, but just looking for other opinions. When deciding which measure of central tendency to use, I tend to...

• Replies: 8
• Views: 3,971
08-02-2011, 02:03 AM
29. ### Basic ANOVA question

Hello, I'm new to statistics and want to analyse a simple data set. I want to show that the expression level of a gene changes by increasing the...

• Replies: 3
• Views: 2,858
07-24-2010, 11:41 AM
30. ### basic ANOVA questions

I do not have a strong background in stats, and am having a hard time figuring out which is the right way to test for significant differences. I...

• Replies: 1
• Views: 4,589
07-21-2010, 10:09 PM
31. ### Basic averages question

I am trying to work out the total average from a set of 5 averages. See below: Class 1: Total number of weeks = 12 Total number of hours =...

• Replies: 2
• Views: 1,376
05-08-2015, 03:01 AM
32. ### Basic biostats ques.

I've got a few questions to ask for help since I'm new to this topic and kinda loathes it, it's so confusing! Maybe it's because it's too logical,i'm...

• Replies: 1
• Views: 1,748
05-25-2012, 12:23 PM
33. ### Basic concept: degrees of freedom

Can someone please explain what this really means? Also, what does adjusting the R-squared for degrees of freedom mean? Thanks.

• Replies: 2
• Views: 2,578
01-04-2012, 09:42 PM
34. ### Basic correlation question

Hello there, I've been asked to look at some data in SPSS for work. I don't normally do anything very complex, I'm more of an IT person so I would...

• Replies: 3
• Views: 2,534
07-19-2007, 01:19 AM
35. ### Basic count analysis Help! Please!

Hi, I'm trying to analyse some basic count data - analyse/portray differences the data in five categories, of which 3 have n=10 and 2 have...

• Replies: 1
• Views: 1,380
09-24-2014, 06:55 AM
36. ### Basic Expectation

hi guys, this problem looks simple but tricky. give it a try. Q. Suppose X1 and X2 are real-valued random variables with f as their common...

• Replies: 7
• Views: 2,228
05-28-2012, 01:20 PM
37. ### basic help needed for Chi-square

Hello all, I feel embarassed even having to ask this, but I'm not much of a numbers person, and I've worked myself into a corner. I would...

• Replies: 4
• Views: 4,148
01-30-2011, 02:08 PM
38. ### Basic high school correlation coefficient help

Question + info: http://i.imgur.com/iyBWi2i.png In question 3, the correlation coefficient I get is the exact same as in question 2... Therefore...

• Replies: 0
• Views: 1,114
02-04-2017, 05:36 AM
39. ### Basic Index Question...help please

Hi, The answer to the following question is \$1400. Is this answer a mistake? I can't seem to get it! Thank you kindly for your help! --Peter ...

• Replies: 1
• Views: 1,263
12-11-2011, 04:16 PM
40. ### Basic IV/DV help

I'm from a social science background, so I thought that my current research study was going to be more straightforward, but I can't seem to even get...

• Replies: 0
• Views: 1,616
11-10-2011, 11:55 AM
41. ### Basic Lottery Question

In Lotto 6-53, there is a box with 53 balls, numbered 1 to 53. Six balls are drawn at random without replacement from the box. You win the grand...

• Replies: 1
• Views: 5,400
02-27-2009, 02:15 PM
42. ### Basic marginal distribution question.

So given the joint probability density function fXY(x,y) = 1/2 * x*y with x ranging from 0 to 2 and y from 0 to x find FY|X(y|x) I understand the...

• Replies: 0
• Views: 902
11-19-2013, 10:17 AM
43. ### Basic Measurement Error when calculating the Mean

Hi all, I have a question about measurement error and how it can play a role when calulating the error of the mean. I have an automated process...

• Replies: 6
• Views: 1,834
12-19-2014, 12:12 PM
44. ### Basic Normal linear Combination problem

I sold my stat textbook and I'm punching myself in the face for forgetting some of the basics. If you have three independent variables, X1, X2...

• Replies: 1
• Views: 1,534
01-28-2012, 12:44 AM
45. ### Basic Probability

I need some help getting started with this question..... There N quantity of tourists on a bus and there are n quantity of children amongst them....

• Replies: 2
• Views: 2,789
05-12-2007, 08:50 AM
46. ### Basic probability help

Mechanical Engineering reported on the need for wireless networks to monitor the quality of industrial equipment. For example, consider Eaton Corp.,...

• Replies: 2
• Views: 1,649
02-26-2017, 08:02 PM
47. ### Basic Probability Question

You estimate the probability that she will answer this question correctly to be 0.8. You estimate the probability you will answer this question...

• Replies: 2
• Views: 3,251
01-13-2011, 06:37 PM
48. ### Basic question

Hi When I have a dataset {x} consisting of N measurements, and I find the standard deviation by the standard expression sigma^2 = (1/N) * sum {...

• Replies: 7
• Views: 2,072
09-14-2011, 11:48 AM
49. ### basic question

Dear all, I am studying the 3 approaches (A, B and C) 47 Spanish public universities from the 17 Spanish states (somes states have more than one...

• Replies: 2
• Views: 1,809
10-12-2011, 05:33 AM
50. ### Basic question

Suppose my null hypothesis is “Not more than 50% person prefer milk” and alternate hypothesis is “More than 50% (or majority) prefer milk”. Actually...

• Replies: 1
• Views: 1,407
01-18-2015, 07:49 AM
51. ### Basic question

Suppose you had a pile of 120 million red and blue jelly beans where 20 out of every 100,000 of them were red jelly beans. And suppose you moved ten...

• Replies: 2
• Views: 1,112
07-23-2015, 08:49 PM
52. ### Basic question about correlation

I'm trying to build an econometric model and have a basic question: Suppose corr(X,Y)=0.5 and corr(X,Z)=0.5, where X, Y, and Z are RVs. Is the...

• Replies: 1
• Views: 1,929
12-04-2006, 01:08 AM
53. ### Basic question about correlation calculations

hi all, i need an urgent help about correlation calculations. assume that, i have two time series data sets, Each contains 100 days (numbers),...

• Replies: 1
• Views: 1,481
06-04-2012, 12:34 AM
54. ### basic question about normality and equal variance

Ok so I have a dataset with normal residuals, but unequal variance. I still ended up with unequal variance after transformations. Do I have to use a...

• Replies: 4
• Views: 3,628
02-20-2010, 11:16 PM
55. ### Basic question about variance

Hi! First time poster, hello all! My question is as follows: a symmetrical dice is tossed ten times. What is the expected value and variance? ...

• Replies: 4
• Views: 1,643
06-06-2013, 08:21 AM
56. ### Basic Question about Weight Average

This is a pretty simple question and I'm wondering how to go about finding a solution. I have the following data. ttt =...

• Replies: 0
• Views: 881
05-08-2013, 10:20 AM
57. ### Basic question on dealing with nominal IVs

Hi all Let's imagine we have 3 columns: Country (with 30 levels, but entirely nominal), GDP (continuous) and voter turnout (continuous) How...

• Replies: 3
• Views: 1,888
03-11-2016, 06:16 AM
58. ### Basic question regarding Logistic regression using census data

Instead of using sampled data, if I use census data to perform Logistic regression, what is the meaning of z-value? Are all coefficients valid...

• Replies: 1
• Views: 1,355
08-19-2013, 09:48 AM
59. ### Basic question regarding methods

Anyone: 1. How many different statistical methods/tests are there? Hundreds? thousands? (ANOVA, chi-square, etc.) 2. Why are there so many...

• Replies: 3
• Views: 1,921
03-18-2006, 05:28 PM
60. ### Basic question...how to calculate minimum sample size with complete population data

Hello, out-of-practice stats guy here. A business question I have is what is the minimum sample size I need to accurately measure revenue per...

• Replies: 1
• Views: 1,602
01-28-2015, 03:09 PM

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