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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: 197,028
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: 66,890
09-30-2005, 09:44 AM
1. ### comparing group probabilities - which test to use

Hi all, I have a data set that consists of 19 populations and 14 genetic loci that have been sampled from each of the 19 populations. The 14 loci...

• Replies: 4
• Views: 1,506
12-03-2012, 01:25 PM
2. ### Coding question.

Hi, This probably has a very simple answer but I can't find any of my 1st year SPSS workshop help sheets. Basically. For our research we...

• Replies: 0
• Views: 1,354
12-03-2012, 09:59 AM
3. ### Correlation Help between ordinal and nominal data

Hi Im new on these forums and i was having difficulty in deciding what test to use for my data. Let me give a background into my information. i...

• Replies: 1
• Views: 1,379
12-03-2012, 06:20 AM
4. ### One-way ANOVA or Chi².

Hey guys, I'm busy with a market research case for school and my team is in doubt on which analysis to use. It's important to note that it's not a...

• Replies: 3
• Views: 65,514
12-03-2012, 06:03 AM
5. ### Kruskal Wallis and Mood's median

Would appreciate some perspective on the following: Is the Mood's median test now rarely used? I am comparing right-skewed distributions (3...

• Replies: 11
• Views: 6,412
12-03-2012, 03:04 AM
6. ### Comparing means with known standard deviation known

1). The average number of pages for a simple random sample of 20 physics textbooks is 435. The average number of pages for a simple random sample of...

• Replies: 0
• Views: 4,581
12-02-2012, 05:48 PM
7. ### Determining sample size

Hi all, I am carrying out a study to compare the accuracy of five independent glucose testing machines against a known calibrated reference machine....

• Replies: 0
• Views: 2,309
12-02-2012, 12:17 PM
8. ### Is the transpose of a g inverse the g inverse of transpose of the matrix?

While working with linear models,I came across the situation where the proof of some results might be easier if we apply that transpose of g inverse...

• Replies: 2
• Views: 1,866
12-02-2012, 09:00 AM
9. ### MLE for bivariate normal

How can I estimate parameters mix,miy,sigmax,sigmay and ro with MLE, if I have bivariate normal dist.?

• Replies: 1
• Views: 2,130
BGM
12-02-2012, 08:33 AM
10. ### confidence intervals - t or z?

The question that I have been given on an assignment is this We select a random sample of 10 healthy adults and record their pulse rates. The...

• Replies: 0
• Views: 2,196
12-01-2012, 11:20 PM
11. ### correlation coefficient

The correlation coefficient between x and y is 0.85 Statement 1-then the correlation coefficient between x/2 and y/2 is 0.85/2 Statement 2-then...

• Replies: 1
• Views: 2,308
12-01-2012, 11:06 AM
12. ### New to statistics, need a few steps on solving problem

Okay guys, as the title says, I'm pretty new to stats. Currently I am working on a problem for a college class that is giving me a lot of grief. I...

• Replies: 1
• Views: 1,667
BGM
12-01-2012, 05:35 AM
13. ### Finding value of a test statistic, but no standard deviation?

I know there should be another way of finding it if the standard deviation isn't given in the problem, but I can't for the life of me find anything...

• Replies: 1
• Views: 2,767
11-30-2012, 01:13 PM
14. ### Fisher Information

Can someone show me visually how the fisher information for a normal distribution goes from... (x-\mu/\theta^2) is equal to (1/\theta^2) I...

• Replies: 0
• Views: 2,310
11-30-2012, 12:20 AM
15. ### mixed design; 2 between subjects and 1 within subjects factors

Hi everyone, As a follow up to my previous thread, I have 2 between-subjects and 1 within-subjects (w/ 3 levels) factors. 1. For...

• Replies: 0
• Views: 1,488
11-29-2012, 11:15 PM
16. ### Problem Involving Moment Generating Functions

Hi, I am working on this assignment and have no idea where to begin. I, however, am not asking for anyone to immediately provide an answer, as I...

• Replies: 17
• Views: 3,011
11-29-2012, 03:35 PM
17. ### Need help in Thesis Proposal (Correlational Study) NEED HELP ASAP!

So my central question is this: Is there a correlation in positive emotional output between winning and losing among young-adult to middle-aged NBA...

• Replies: 13
• Views: 1,959
11-29-2012, 01:01 PM
18. ### opposite of a formula

I know the formula for number of elements in a correlation matrix triangle is: \frac{p(p-1)}{2} = t where: p = number of predictors t =...

• Replies: 3
• Views: 1,845
11-29-2012, 10:40 AM
19. ### Sufficient statistics in Generalized Linear Models

I am learning about Generalized Linear Models, and I am trying understand this page about sufficient statistics. I intuitively know what sufficient...

• Replies: 0
• Views: 2,553
11-29-2012, 04:50 AM
20. ### TOEPLITZ covariance matrix

I am conduting a repeated measures analysis. My work shows that the TOEPLITZ covariance structure is most suitable. I am now trying to understand...

• Replies: 4
• Views: 2,318
11-29-2012, 03:32 AM
21. ### negative correlation

hello i do conjoint analysis in carpet industry. i have six attributes (two of them have 3 levels and others have 4 levels). number of samples are...

• Replies: 3
• Views: 2,058
11-29-2012, 02:42 AM
22. ### Confidence intervals, proportions

A simple random sample of 1000 New Yorkers finds that 87 are left-handed. (a) Find the 95% confidence interval for the proportion of New Yorkers...

• Replies: 1
• Views: 869
11-28-2012, 11:59 PM
23. ### Explain how to conduct statistical analysis on survey results

I am a philosophy graduate student and am currently taking an empirical research class. I slacked off in this class this semester, as it is not...

• Replies: 5
• Views: 3,568
11-28-2012, 07:50 PM
24. ### Testing a number sequence for a deviation from expected

Hi, I have a number sequence (~22,000 numbers) with numbers 1-4 that should be appearing in a random fashion. I know that the numbers have...

• Replies: 0
• Views: 1,427
11-28-2012, 06:21 PM
25. ### Time Series/Trouble Identifying Model Type

Here is the question that I have: I'm having trouble identifying what kind of model that is. It looks like ARMA(2,1), but using first order...

• Replies: 0
• Views: 1,296
11-28-2012, 04:32 PM
26. ### Statistic type question university

The Canadian Census collects demographic data for specific groups such as lone-parent families, seniors, and those from specific language groups via...

• Replies: 2
• Views: 1,456
11-28-2012, 03:30 PM
27. ### a challenging Question !

any helpful guidelines ? Question As you may have noticed, Dr.Mike says “right” in class, A LOT, and now Dr.Mike has made this into a CFC...

• Replies: 2
• Views: 1,206
11-28-2012, 12:20 PM
28. ### Can someone help with this question ?

The Ledd Pipe Company has received a large shipment of pipes, and a quality control inspector wishes to estimate the average diameter of these...

• Replies: 1
• Views: 1,309
11-28-2012, 11:13 AM
29. ### University help, please! Don't know what tests to use! Only 4 needed.

Hi guys, I'm studying an equine degree, and have had to do a statistics module. Coming from an agricultural background, I have no drive for...

• Replies: 1
• Views: 1,376
11-28-2012, 10:49 AM
30. ### How to do this question!

Many colleges and universities hold a “blood drive” for organizations such as the Red Cross. To help with the planning of an upcoming blood drive,...

• Replies: 1
• Views: 1,184
11-28-2012, 10:24 AM
31. ### How to compare two groups of means- HELP!!

I am a microbiology graduate student struggling to figure out how to analyze some gene expression data. Here is a synopsis of my experiment/data: I...

• Replies: 2
• Views: 1,936
11-28-2012, 09:48 AM
32. ### Finding the Limiting Distribution

For the pdf f(x) = (θ^2+θ)*(x^(θ-1))*(1-x), 0<x<1, let Y1<Y2<...<Yn denote the corresponding order statistics. Find β so that Wn = (n^β)*Y1...

• Replies: 4
• Views: 3,460
11-28-2012, 09:26 AM
33. ### distribution of the corelation coefficient

In the straight-line regression, since r=beta*SY/SX and beta is a normal distribution, so r is a normal...

• Replies: 1
• Views: 1,120
BGM
11-28-2012, 12:23 AM
34. ### using alternative for Wilcoxon signed rank test for yield data?

Hi, for comparing relative yields from a treatment in consecutive trials I now use Wilcoxon signed rank test (example below). This requires identical...

• Replies: 2
• Views: 1,455
11-28-2012, 12:23 AM
35. ### Likelihood Ratio (Simple)

We are given the following distribution: x 1 2 3 4 f0(x) .2 .3 .3 .2 f1(x) .1 .4 .1 .4 The sorted Likelihood Ratio...

• Replies: 2
• Views: 2,055
11-27-2012, 09:24 PM
36. ### not sure of statistical test, probably some kind of ANOVA

Hi all, I am not sure how to proceed given my data. I would appreciate if anyone could suggest a design. I tested the acceleration responses...

• Replies: 9
• Views: 1,765
11-27-2012, 09:23 PM
37. ### Help rearranging an equation

Hi all, rearranging equations still baffles me somewhat...I'll give some example sand questions I have re them This is from...

• Replies: 1
• Views: 1,913
11-27-2012, 08:49 PM
38. ### Anova help!!!

I'm just finishing the proposal for my dissertation and i am totally confused! So : I have 4 IV AND 2 DV and i don t know what type of anova to do...

• Replies: 5
• Views: 1,203
11-27-2012, 08:28 PM
39. ### Update: Need P/1 exam practice?

I now have three practice exams available. You may choose 10 questions in 1 hour, twenty questions in two hours or thirty questions in three hours if...

• Replies: 0
• Views: 817
11-27-2012, 08:15 PM
40. ### Evidence of Reliability and Validity of Revised Inventory

We have been using a marriage inventory which asks questions of engaged couples about how they feel about different aspects of marriage. They...

• Replies: 0
• Views: 954
11-27-2012, 07:04 PM
41. ### Normal Approximation questions. Finding p?

1) An ESP test involves five shapes (star, square, circle, wave, cross) on cards. We record 1000 attempts. (a) What is the probability that a subject...

• Replies: 1
• Views: 1,763
11-27-2012, 05:35 PM
42. ### Weighted standard deviation

Hey everyone, I suppose I have a rather simple question . I have following information: 17 year olds, mean of height 176.50, standard deviation...

• Replies: 0
• Views: 1,941
11-27-2012, 10:48 AM
43. ### Normal Distribution

Hi I have a question regarding normal distribution that I had on a quiz, but seemed to have gotten wrong. My professor marked the answers and I have...

• Replies: 1
• Views: 998
11-27-2012, 01:55 AM
44. ### Critical Value (T-Statistic Question)

Hey everyone, I have gathered some data for a school project and I am calculating the various ways to express the data. I have come to the point...

• Replies: 0
• Views: 1,073
11-26-2012, 09:02 PM
45. ### How should I aggregate data across multiple periods

Hi, I am trying to figure out the best way to aggregate data and am unable to find anything in the literature (e.g., Google or this site) to give...

• Replies: 0
• Views: 1,441
11-26-2012, 07:24 PM
46. ### How to eliminate the effect of a correlating variable

I have two variables with a very strong negative correlation (on the order of -.80). Variable A is my key variable, the variable I want to use for...

• Replies: 0
• Views: 1,149
11-26-2012, 05:12 PM
47. ### Distribution of fitted values

I need to find/show the distribution of the fitted values of y^=μ^ I'm not even sure where to start with this.

• Replies: 1
• Views: 1,134
11-26-2012, 04:09 PM
48. ### Jacobin of Kronecker product

If D is a qxq symmetric matrix, let Y=D ⊗ Identity(N) is a kronecker product of D and a NxN identity matrix. Is the Jacobian of Y w.r.t DI,...

• Replies: 0
• Views: 1,263
11-26-2012, 03:55 PM
49. ### Sign Test?

Hi everyone, i've got a question and been told to use a test, and i think its the sign test which i should use, just need some clarification! ...

• Replies: 3
• Views: 1,102
11-26-2012, 03:15 AM
50. ### Non-parametric test equivalent to two-way anova?

Hi everyone. I have a question on non-parametric tests that replace anova tests. In my first data set, I have scat density data grouped according...

• Replies: 1
• Views: 4,631
11-25-2012, 11:14 PM
51. ### What kind of test could be done on the following data ?

Bit of background....in this hypothetical experiment there are 5 people and there are two different kinds (Type 1 and Type 2) of health tablet...

• Replies: 0
• Views: 1,364
11-25-2012, 08:01 PM
52. ### Testing the significance of change between two groups

Hi all, I was hoping for some advice on how to test the change between two groups. First of all, my groups are relatively large (n=100-150)....

• Replies: 0
• Views: 2,172
11-25-2012, 05:40 PM
53. ### Hypothesis Testing Practice.

Im here stressing my mind on this question and I would appreciate to know if I am on the right track. So the question is like: A boy is...

• Replies: 0
• Views: 1,370
11-25-2012, 04:08 PM
54. ### Can I merge these groups for increased statistical power?

I did a biological experiment with 4 groups (n=5 per group). Each group received a treatment as follows: Gr.1: Treatment A Gr.2: Treatment B...

• Replies: 5
• Views: 1,666
11-25-2012, 02:58 PM
55. ### Please help with t statistics, I really appreciate any assistance

Thank you for viewing my questions I have solved the answers on my own. Hi, Thank you for any assistance with these questions. I have been...

• Replies: 0
• Views: 1,122
11-25-2012, 12:20 PM
56. ### 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: 2,589
11-25-2012, 06:09 AM
57. ### Help with inter-rate reliability calculation with multiple raters and nominal data

I have 12 raters. Each of them is going to rate if a patient needs a certain diagnostic test. The answer is yes or no. I would like to calculate the...

• Replies: 0
• Views: 1,934
11-24-2012, 11:01 PM
58. ### Help finding probability with sample mean & standard deviation

Can anyone help me on how to do this problem? I'm so confused

• Replies: 2
• Views: 2,114
11-24-2012, 10:00 PM
59. ### Please assist with this question?

In a recent survey by the Miami Mental Health Clinic, Miami's general population prevalence mental health illnesses yielded the following data: 21...

• Replies: 2
• Views: 1,771
11-24-2012, 09:45 PM

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