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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: 197,032
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: 66,893
09-30-2005, 09:44 AM
1. ### A case for a MANOVA?

Hello everyone, So I am looking at a study with 60 kids, in 3 age groups year 1,2,3 (20-20-20) and how well they did in tests in 2 subjects,...

• Replies: 0
• Views: 1,594
03-29-2012, 08:37 PM
2. ### A causes B - B causes C - Does A cause C?

Hi all! I have a simple problem with my two hypotheses: H1: Industry dynamic (A) positively influences competence (B). H2: Competence (B)...

• Replies: 11
• Views: 4,692
07-19-2013, 06:28 PM
3. ### 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
4. ### A class boundary confusion

When there is grouped data like; x frequency 0 - 1 3 2 - 3 7 4 - 5 ...

• Replies: 3
• Views: 2,289
09-21-2011, 08:21 PM
5. ### A composite score ?

Hello there, I read several articles about composite scores but I still have a question. For my research, I need to merge two scales into one in...

• Replies: 0
• Views: 1,219
05-24-2012, 03:14 AM
6. ### A conceptual question on stat test

I'm using a chi-square test of confidence level 95&#37;. The possible test results are: (1) test statistic below the threshold T: measurements are...

• Replies: 0
• Views: 1,978
08-13-2007, 01:42 AM
7. ### A conceptual question that i cannot came up with an answer!

Hi again im editing the question because as i read the honor code of take-homes of my university, i realized that this should not be even here so,...

• Replies: 1
• Views: 1,429
11-17-2013, 06:14 PM
8. ### A conundrum: within- and between-subjects

I'm facing the following problem with my results. Imagine that the experimental task was to place a circle and a square along a one-dimensional...

• Replies: 0
• Views: 2,377
06-18-2010, 03:09 PM
9. ### A correctional institute

A correctional institute would like to report the mean amount of money spent per day on running facilities. how many days should be considered if a...

• Replies: 0
• Views: 3,271
04-01-2009, 11:08 AM
10. ### A couple linear algebra questions (including SAS proc iml)

EDIT: \sigma should be capital sigma, the covariance matrix, but I can't remember how to write it. First question Looking at Z, it's fairly...

• Replies: 1
• Views: 1,633
02-06-2014, 04:04 PM
11. ### A couple of regression questions

Hi all, I'm pretty new to statistics and am getting a bit confused with all the terminology that's being thrown out there. I've tried googling...

• Replies: 3
• Views: 1,766
02-12-2015, 07:53 AM
12. ### A different kind of Drunkard's Walk

A Different Drunkards Walk In short: Imagine a drunk waking up in the middle of a thin rope bridge. He can only go in one of two directions....

• Replies: 1
• Views: 2,520
07-15-2009, 04:54 AM
13. ### A difficult SPSS question

I have a data set in which household is as a unit (wide format) One of the variable is about relationship between household members, below is the...

• Replies: 0
• Views: 1,265
05-02-2016, 08:47 AM
14. ### a fairly easy regression problem with answer

I'm having some trouble figuring out what to do here...it's a problem to be addressed in class TOMORROW so we weren't really guided on how to do it,...

• Replies: 2
• Views: 3,348
05-05-2010, 10:55 PM
15. ### A few questions

Hi just wondering if anyone could just make sure I'm doing this right. Can you also help on the last question especially. Thanks 1) Z~N(0,1) and...

• Replies: 1
• Views: 2,457
08-01-2014, 09:01 AM
16. ### A few questions

I have a few stats homework questions that I can't seem to figure out and was hoping someone could help me figure out. Here are the questions, though...

• Replies: 1
• Views: 3,999
10-16-2008, 12:23 PM
17. ### A few questions from a sample final that have my mind boggled.

As many of you know, it's finals time at many schools around the nation. I am currently enrolled in a Stats class, and it has to be one of the most...

• Replies: 0
• Views: 2,160
12-11-2012, 01:50 PM
18. ### A few questions.

Hi all, I'm doing a review for my econometrics course and a few things came up. I"ll of course include what I've come up with so far. 1. If the...

• Replies: 2
• Views: 1,748
09-18-2010, 12:11 PM
19. ### a few stats problems

1.find the margin of error for the 94&#37; confidence interval for the mean systolic blood pressumes for women with n=92, xbar=114.9, and 0=13.2 2.the...

• Replies: 6
• Views: 3,264
11-30-2009, 01:04 AM
20. ### a flooding problem

I am a little stuck here with my stats analysis, wondering if anyone could shed some light? I am testing whether long levee banks (used to protect...

• Replies: 1
• Views: 1,794
07-26-2007, 11:20 AM
21. ### A function to make up a profile of respondents?

Hi I want to know if there is a function in SPSS to do the following: After running some frequencies and cross-tabs I ended up with a group of...

• Replies: 0
• Views: 1,737
07-26-2012, 08:03 AM
22. ### A fundamental question!

First sorry for my first-grade English! If you are OK with it, please read on. Second, sorry that my question is so basic, but sometimes I see...

• Replies: 45
• Views: 13,911
01-25-2012, 05:57 AM
23. ### a good example of ANCOVA in R

Hi, I was wondering if someone can provide a nice and quite complete example of ANCOVA in R. thanks :)

• Replies: 2
• Views: 1,354
06-17-2013, 09:23 AM
24. ### A hypothesis testing question

There is a multiple choice question paper of 60 questions each with four answers and only one of which is correct. With zero knowledge about the...

• Replies: 2
• Views: 2,005
09-19-2011, 07:16 PM
25. ### a lil' more help

:shakehead :wave: okay i am stuck on this one. a recent study in a city stated that the average of retired men was 63.5 years. A sample of 20...

• Replies: 1
• Views: 2,027
12-08-2005, 11:53 AM
26. ### A little bit of combinatorics

I didn't find a subforum devoted to combinatorics in this forum, so I post my question here. I have two sets. In one set I have N elements a1, ......

• Replies: 4
• Views: 1,541
01-28-2013, 01:01 PM
27. ### A little Help

So I'm doing this stats project. My project was to test how far(inches) a toy car can go off a ramp of five different heights (5, 10, 15, 20, 25...

• Replies: 1
• Views: 628
11-27-2013, 09:27 AM
28. ### A little help on testing hypothesis

Hi. I'm working on a few problems that ask me to test the null hypotheses or "what conclusions can I reach" using a 5% significance level. What...

• Replies: 2
• Views: 4,626
12-12-2010, 05:42 PM
29. ### A little help please...

Hello everyone, I'm working on a lab for a test and have had trouble with these type of problems. Some I have already worked and just need a...

• Replies: 3
• Views: 4,613
11-19-2010, 10:12 PM
30. ### A little help please...

I have a problem regarding the statistical analysis of data from my research. I have calculated the sensitivity, specificity, PPV, NPV for various...

• Replies: 1
• Views: 1,428
01-28-2012, 07:56 PM
31. ### A little help with a HW problem

I'm having trouble figuring out a HW problem and was wondering if someone could guide me in the right direction. Problem: Find The Z-Score That...

• Replies: 4
• Views: 2,171
11-05-2010, 05:13 PM
32. ### A little help with some conceptual understanding

Hi All, I am trying to help my wife with her University statistics project (Year 2) but her lecturer is incredibly unhelpful. The way they have...

• Replies: 2
• Views: 1,591
03-09-2014, 12:55 PM
33. ### A little help with statistics

Hey all I am having trouble with statistics, and I am wondering if any of you can help me out with these few questions with steps. 1. A...

• Replies: 0
• Views: 1,485
03-29-2010, 03:25 AM
34. ### a little question about mode and median

I came across a situation where the median is equal to the mode, while the average is bigger. also, Q3-Q2 = Q2-Q1 can anyone tell me what can it...

• Replies: 6
• Views: 3,929
03-10-2011, 11:24 PM
35. ### A manual example of Moran's Local I (Outlier)

Dear forum, a question about spatial statistics: I am trying to uderstand exactly how the Local Moran's I equation works, the equation can be...

• Replies: 0
• Views: 2,813
10-23-2013, 07:54 AM
36. ### A Marginal Distribution Problem

Please help with an exam problem, Thanks! let x and y be jointly distributed discrete random variables, with P(X=x)=1/4, for x=1,2,3,4 ...

• Replies: 4
• Views: 2,826
11-14-2011, 10:23 PM
37. ### A measure for agreement between raters scoring

Hi - I'm looking for a measure for the level of agreement between a number of raters who score performance of something on 1-4 scoring range. ...

• Replies: 4
• Views: 1,664
09-23-2015, 11:11 AM
38. ### A Medical Imaging statistics Question

Hi, I did a training project a work a while ago and I never found a satisfactory answer to a inferential statistics problem. This question might...

• Replies: 1
• Views: 2,855
09-02-2010, 11:03 AM
39. ### A method sensitivity 1:10^3 or 1:10^5

I am developing a PCR method to assess A cell contamination in B cells population. A cell express a large amount of C gene, but B cell only express...

• Replies: 0
• Views: 1,499
02-27-2017, 11:44 AM
40. ### A mixed hierarchical linear model (SPSS?)

Hi there, I have the following design: Sub-regions (x 4) Within each sub-region are sites (x 20 in total: 4 in subr #1, 6 in subr #2, 7 in subr...

• Replies: 0
• Views: 5,719
03-23-2010, 08:32 PM
41. ### A name of this measure?

How to name chg1/chg2 or is there any related (better/recognized) measure? before after chg1 chg2 chg1/chg2 ...

• Replies: 0
• Views: 2,391
06-29-2008, 09:19 AM
42. ### a need a little help here

I'm not sure how to do this A sample of the reading scores of 29 fifth gtaders has a mean of xbar=83 and a population standard deviation of r=10.5....

• Replies: 2
• Views: 2,583
03-16-2010, 11:20 AM
43. ### A non-parametric test for nomimal data made up from two independent variables

I have been looking for a statistical test to run for some experimental data I have acquired. I have two groups (IV); Stress and Control mice. ...

• Replies: 0
• Views: 1,125
02-23-2016, 06:12 AM
44. ### a nonparametric test to study dispersion between two dependent samples

Hi I have been using a nonparametric test (ansari bradley test) to study disperson between two samples, but i just realised that my samples were in...

• Replies: 2
• Views: 2,699
12-04-2008, 12:51 PM
45. ### A parameter or a stastic

1) A little confused? In a data set would the proportion of males constitute a a parameter or a statistic. My thought is that this is a sample...

• Replies: 1
• Views: 3,026
01-25-2009, 05:30 PM
46. ### A parametric hypothesis testing problem!

Hello guys, So I have this problem I am trying to solve and it

• Replies: 1
• Views: 1,166
05-11-2015, 08:20 AM
47. ### A particular type of random coefficient regression

Hi all, I have the model of type Y_i=Beta_0_i+Beta_1_i*X1_i+...+Beta_k_i*X_k_i, for i=1:n There is no error term in this model, but for each...

• Replies: 0
• Views: 1,049
11-04-2012, 11:40 PM
48. ### A power analysis question - am I making a big mistake?

Apologies for repeat posting, but I think I may have originally posted this in the wrong sub-forum... Help! It's a very long time since I have had...

• Replies: 1
• Views: 2,462
01-02-2010, 01:03 PM
49. ### A pretty basic question about comparing two samples, looking for guidance.

nvm, thanks

• Replies: 2
• Views: 1,710
05-19-2011, 12:58 AM
50. ### A Prior for Cobb Douglas

I have this equation Q= β0*(L^b1)*(K^b2)*e^u The question is how can I take into account that I have constant returns to scale? All I know is an...

• Replies: 2
• Views: 1,879
09-16-2013, 11:29 AM
51. ### a priori power analysis to determine sample size

Dear Seniors, The design of my research is a within-subject 4-way anova. Each of the four independent within-subject variables has two levels. I...

• Replies: 0
• Views: 5,239
02-23-2009, 05:51 PM
52. ### Moved: a probability problem

• Replies: -
• Views: -
09-19-2006, 08:17 PM
53. ### a problem of MLE

suppose X1,X2,,Xn have joint distribution. if X1∼N(0,1) and for j=0,1,,n−1 conditional distribution Xj+1|X1=x1,,Xj=xj∼N(ρxj,1), then find MLE...

• Replies: 1
• Views: 4,251
03-05-2012, 08:50 AM
54. ### a problem on chi-square test for weight data

Dear all: Normally, we carry out chi-square test for NOMINAL data while T-TEST for numerical data. But I happened to meet the problem when...

• Replies: 0
• Views: 2,439
03-08-2009, 04:31 AM
55. ### A problem on conditional probability, with two random variables

Hi , thanks for reading. The question I come across was as follow: Y1 and Y2 are independent poisson random variables with means A and B, a)...

• Replies: 3
• Views: 6,558
04-20-2011, 05:19 PM
56. ### a problem regarding maximum and minimum of two positive random variables

Suppose X and Y are two positive random numbers. Define U = max(X, Y ) and V = min(X, Y ) Show that: (a) E(X)E(Y ) >= E(U)E(V ): (b) Var(X) +...

• Replies: 1
• Views: 1,242
09-12-2012, 11:41 AM
57. ### A Proper Name for This Equation???

This is my first post and probably not the last. My question is this: Is there a proper name for this equation? x values) - (Average of y...

• Replies: 1
• Views: 2,348
06-14-2009, 06:55 AM

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