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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. ### Question on Taguchi Method

Hi, I had a question on the dummy treatment technique in the Taguchi method. Suppose I am downgrading a 3 level column into a 2 level column by...

• Replies: 0
• Views: 1,974
05-24-2007, 10:06 AM
2. ### Problem- fluctuating negative control

Hi, I have what sounds to me like a simple question that I just want to hear some opinions on. I'm trying to quantify changes in gene expression...

• Replies: 0
• Views: 1,687
05-24-2007, 09:13 AM
3. ### This has to be simple if you know what you're doing?

I have two data sets with very different magnitudes. The first data set ranges from 2000 to 40000. The second data set ranges from 20 to 500. I...

• Replies: 1
• Views: 2,661
05-24-2007, 07:52 AM
4. ### Stuck on Acceptance Sampling

Hi, I'm studying stats independently so don't have a teacher to ask how to finish this question. Any help would be much appreciated. Before being...

• Replies: 0
• Views: 2,138
05-23-2007, 10:29 AM
5. ### Which statistical test?

Hi I have an exam on Monday and am trying to work out on practice question we received in class. It asks us to identify and match the appropriate...

• Replies: 1
• Views: 2,674
ams
05-21-2007, 07:15 PM
6. ### What's the point in T scores?

Hi all, I have a questionnaire thay converts raw scores to T scores (scores with a mean of 50 and std. dev of 10). I have run some analyses and...

• Replies: 1
• Views: 2,393
05-19-2007, 09:25 PM
7. ### Which statistical test should I use

In an experiment to test the hypothesis of group polarization there are two groups of 120 militarists and 80 pacifists. Both groups were asked to...

• Replies: 1
• Views: 2,504
05-19-2007, 05:57 PM
8. ### Measurements of biodiversity

When considering the biodiversity of an aquatic system after a human caused disaster (chemical spill) what would be a adequate measure of...

• Replies: 1
• Views: 2,587
ams
05-18-2007, 04:19 AM
9. ### Survey Response Problem

I hope someone will help me with this. The problem I have to work out is a scenario involving a survey. Let's say a survey is administered to 985...

• Replies: 1
• Views: 2,838
05-16-2007, 11:48 PM
10. ### stat problem

Suppose that your sister is a Floridian orange farmer. She followed a particular orange growing method (i.e. certain type of fertilizer, irrigation...

• Replies: 0
• Views: 2,080
05-16-2007, 04:01 PM
11. ### autoregression, autocorrelation

Hi, I am estimating the following regression which contains lagged dependent variables and lagged indepedent variables and I am worried about the...

• Replies: 0
• Views: 3,069
sun
05-16-2007, 11:35 AM
12. ### Generating Random Numbers

Hi guys i have a couple of Qs regarding generating random numbers: 1. Suppose you are given only 3 very basic tools: • a uniform random number...

• Replies: 0
• Views: 2,894
05-16-2007, 06:57 AM
13. ### Help needed on problem, URGENT! Thanks in advance.

I'm stuck on figuring otu the mechanism required to solve these sample mean problems when you need to compare two different samples. Check it...

• Replies: 2
• Views: 5,182
05-16-2007, 03:49 AM
14. ### Real-life Ballot problem

Wonder if anyone can help me. There has been an oversubscription of applications for tickets for a major sporting event so the organisers have...

• Replies: 0
• Views: 3,188
05-15-2007, 01:04 PM
15. ### Which test?

I have been doing some research into sleep quality. I have two groups of people, labelled as good and bad. Each person has filled in Using the...

• Replies: 0
• Views: 2,133
05-15-2007, 10:26 AM
16. ### Artificially create biased sample for low response

Hi all, I am building a binary 0/1 logistic model where the response rate is very low (0.6%, 77000 out of 12000000). One suggestion was to...

• Replies: 0
• Views: 2,271
05-15-2007, 09:29 AM
17. ### Recommended Text

Hello all! I am an undergrad who is wrapping up my BA in a few weeks and I am going to be attending graduate school in the Spring of 08; majoring...

• Replies: 3
• Views: 5,315
05-15-2007, 01:13 AM

I've been looking over some problems to see what tests and techniques i need to use but it's been a long while since i've worked on statistics, so...

• Replies: 1
• Views: 1,684
05-14-2007, 03:55 AM
19. ### Suitable statistic test

Hello, I have been reading a scientific journal and I want to check the statistical significance between two groups in their results. I have the...

• Replies: 1
• Views: 2,679
05-14-2007, 03:45 AM
20. ### Probability Question

Urn 1 has 2 white balls and 4 red balls. Urn 2 has 2 white balls and 1 red ball. a ball is then randomly picked from urn 1 and placed into urn 2...

• Replies: 2
• Views: 2,435
05-14-2007, 03:24 AM

Hi I have a problem at work. I don't know why I got it but there you go. I work in a hospital and we are changing how we provide care. This...

• Replies: 0
• Views: 1,986
05-14-2007, 03:20 AM
22. ### ANOVA - Post Hoc Testing Problem.. Help!!

Good Morning all, This is my first post.. I am so excited that this forum exists.. I am running an ANOVA at the moment, with a DV, and 3 IV's....

• Replies: 0
• Views: 2,140
05-12-2007, 09:04 PM
23. ### 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
24. ### I need a Professional statistician for answering the following question How I canProf

Hello, every body, First of All I would like to introduce myself; I am a researcher in the field of plant physiology who do not have enough...

• Replies: 0
• Views: 1,680
05-10-2007, 02:20 AM
25. ### Variance/Normal Distributions

I am currently in a psych tests and measurements class. I have a couple of questions that I can't figure out or find in the book. They are multiple...

• Replies: 11
• Views: 5,185
05-09-2007, 10:38 AM
26. ### AS Statistics - Time Series Analysis (S2)

Hello all My teacher was teaching us Time Series Analysis qiute a while ago and when he was explaining it i didn't understand properly and didn't...

• Replies: 0
• Views: 4,170
05-09-2007, 10:24 AM
27. ### Comparing two lines?

Hey all, I'm just having a little trouble figuring out how to do this...I have a linear regression line, and am trying to statistically compare it...

• Replies: 0
• Views: 2,645
05-08-2007, 02:55 PM
28. ### Conditions Number, Collineartiy detection

:shakehead Is there someone who can help me how to use the condition numbers for multicollinarity detection ????

• Replies: 0
• Views: 2,039
05-07-2007, 03:16 PM

hi to all, planstudyabroad.com are providing online free consultancy services for foreign education to all around the world. i got much useful...

• Replies: 0
• Views: 1,621
05-07-2007, 08:57 AM
30. ### Additional Exercise for the book - A Course in Large Sample Theory" by Ferguson.

The link is: http://www.math.ucla.edu/%7Etom/LST/lst.html I need help in solving some problems in section 5, 8, and 14. Does anyone have the...

• Replies: 0
• Views: 2,506
05-06-2007, 07:33 PM
31. ### Finding Sample Standard Deviation

Given this information, how would you know the sample standard deviation? 1) Your company has a contract to provide 3,000,000 bolts to a Chinese...

• Replies: 0
• Views: 2,137
05-06-2007, 06:09 PM
32. ### what is the minimum sample size for standard deviation?

Hi. Just a quick question. Can you perform a standard deviation test if n=2? Thank you.

• Replies: 0
• Views: 7,115
05-05-2007, 05:20 PM
33. ### Multicolinearity, eigenvalues

How to find out the variables involved in a sets of multi-collinearity by the mean of the eigenvalues and condition number ?

• Replies: 0
• Views: 2,031
05-05-2007, 03:23 PM
34. ### How do I calculate tolerance values in a ANOVA?

I need to understand how to hand calculate the tolerance values that are shown in an ANOVA table. This value has something to do with the multiple...

• Replies: 0
• Views: 4,875
05-04-2007, 05:38 PM
35. ### Statistical project

Dear all, I have a small statistical project for my Intro to Statistics class. And I have decided to choose to interpret and compare markets in...

• Replies: 0
• Views: 1,890
05-04-2007, 03:21 PM
36. ### Help with Satorra & Bentler

I have a problem regarding Satorra & Bentler: Could anyone give a precise explanation of SB statistics and what it tends to do if there is excess...

• Replies: 1
• Views: 2,418
05-04-2007, 02:20 PM
37. ### Chi-square

The chi-squares are all of the form nc. Two situations: a) If the model does not hold, c converges to a positive constant C when sample size goes...

• Replies: 0
• Views: 2,469
05-04-2007, 07:17 AM
38. ### A test for a 'buffer' hypothesis

Just wondered if anyone knows how I can test the hypothesis: 'Higher levels of Job Control act as a buffer against fatigue related to Job Demands' ...

• Replies: 0
• Views: 1,504
05-03-2007, 10:26 PM
39. ### How to determine whether 2 slopes are different when they are correlated?

Hi! Let's say I have a variable "A" that I believe measures a trait, say, "greed". I show 2 groups of pictures (say, 10 pics in each group) to...

• Replies: 0
• Views: 2,281
05-03-2007, 09:05 AM
40. ### Hypothesis Testing Help!

If anyone could help me out with this, I'd appreciate it. Looking at the increase in nicotine levels from 1998(1.72mg) to 2004(1.89mg) here. One...

• Replies: 1
• Views: 2,406
05-03-2007, 07:37 AM
41. ### Help with effect size on repeated measures

Hi, I need some help on effect size on project I'm doing. Let me explain about the project. I measure the jump height on 30 men and 30 women at 7...

• Replies: 0
• Views: 3,159
05-02-2007, 08:26 PM
42. ### Test for differences in proportions?

Hello! I conduct a survey in which I have a very large (approximately 800,000 records) set of numerical data (the data is financial data ...

• Replies: 0
• Views: 2,512
05-02-2007, 05:57 PM
43. ### Stats Problem Help

I am reviewing some old stats work to freshen up for a new job..They gave me some review stuff and this was one of the questions I am somewhat stuck...

• Replies: 0
• Views: 2,336
05-02-2007, 09:16 AM
44. ### Gold standart

I have to devices Gold standard (PH) New Device 5.4 5.2 5.4 5.1 7 ...

• Replies: 0
• Views: 1,935
05-02-2007, 06:17 AM
45. ### Normal Distribution

Hi there , Im new to this forum. Does anyone know where I canfind notes on normal distribution? JAmes

• Replies: 0
• Views: 1,808
05-02-2007, 05:31 AM
46. ### An interesting Bayesian question

Suppose a random sample of size n is from uniform distribution U(0, exp(gamma)), suppose the prior distribution of gamma is N(a, b), how to find the...

• Replies: 0
• Views: 1,695
05-02-2007, 12:05 AM
47. ### Help:Chi squared for homogeneity or goodness-of-fit?

OK, I have removed the old message.

• Replies: 0
• Views: 3,214
05-01-2007, 06:14 PM
48. ### bonferroni's multiple comparison

hi, do i have to use bonferroni's multiple comparison adjustment when i am doing analyses on multiple measurment of the same speciemn? thanxx

• Replies: 0
• Views: 2,856
mia
05-01-2007, 10:22 AM

my convinience sample size was 148, i distributed questionnares (made up of rating scales) to all those in the sample. i had a response rate of 25. ...

• Replies: 0
• Views: 2,343
04-30-2007, 09:03 AM
50. ### Independent t-test

Alright I've really been struggling with this one so maybe I can find some help here. If, with the use of the independent t test, the null...

• Replies: 1
• Views: 4,360
04-30-2007, 07:49 AM

Hi, I'm new here. I found this place on Google after two days of studying like mad and not understanding anything. well, sort of. Let me...

• Replies: 2
• Views: 2,226
04-29-2007, 03:14 PM
52. ### another stats question

the mahi rent-a-car company is intgerested in estimating the mean number of miles its cars areg driven on a particular holiday. it has 23000 cars...

• Replies: 0
• Views: 2,282
04-29-2007, 02:46 PM
53. ### stats question

can anyone help me with following Jim's chocolate chip cookies advertise an average of 5 chocolate chips per cookie. let x be the number of...

• Replies: 0
• Views: 2,246
04-29-2007, 02:40 PM
54. ### Paired T-Test & Cross Validation

I understand how to calculate the paired t-test but how should things be done differently if you're using 10 fold cross-validation? Also if I...

• Replies: 0
• Views: 3,118
04-29-2007, 12:08 PM
55. ### reporting linear mixed effects

Hello, I am fitting a linear mixed effects model to data of a psycholinguistic experiment in which participants had to rate the naturalness of...

• Replies: 0
• Views: 4,563
04-29-2007, 04:37 AM
56. ### Mann whitney U help!

Hiya, I have done 5 seperate mann whitney u tests, but I am having trouble finding the significance of my results. One book says to use the same...

• Replies: 0
• Views: 5,028
04-28-2007, 09:06 AM
57. ### Bowker

• Replies: 0
• Views: 1,958
04-28-2007, 08:47 AM
58. ### Tests for Proportions

:wave: In a hypothesis test for a proportion, why isn't it necessary to apply a continuity correction when converting phat to a z value?

• Replies: 0
• Views: 2,358
04-27-2007, 09:38 AM
59. ### Help!! Need advice on calculating percentiles

Hi - Hoping I can get some opinions on the method we are using to calculate percentiles. I work with a small non-profit - I need to calculate...

• Replies: 2
• Views: 8,145
04-26-2007, 02:20 PM
60. ### Help: Stats Project

The project is to run regression analysis on 2 stocks compared to the S&P 500 and then do a write up about it. I did the regression analysis on excel...

• Replies: 2
• Views: 3,605
04-26-2007, 09:06 AM

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