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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### 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: 66,934
09-30-2005, 09:44 AM
2. ### 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: 197,119
07-16-2014, 11:01 AM
1. ### Trace of matrix product

i need to prove that (xt)Ax = tr(Axxt) where xt is Xx transpose. please help me! I tryed but..nothing

• Replies: 2
• Views: 3,558
BGM
10-11-2010, 03:38 PM
2. ### t-test

Hi, I have the following "easy" problem: I am interesting in undertanding whether two groups of firms have the same mean return. The two groups are...

• Replies: 1
• Views: 1,389
04-03-2012, 10:16 PM
3. ### Nonparametric Tests: Independent Samples

Good Afternoon. I am new to the group and am hopeful that I can receive some advice here. I am a graduate student comparing two groups. The outcome...

• Replies: 4
• Views: 2,390
03-31-2012, 08:46 PM
4. ### Nonparametric 3 factor ANOVA

I am trying to find a nonparametric equivalent for 3 within subject factors ANOVA test. I checked Friedman test, but all the examples that I found...

• Replies: 3
• Views: 10,307
05-07-2013, 10:14 AM
5. ### Interpretation of a certain observation

I have some identities that are distributed in a 2D space. Each identity has the properties X, Y, latitude, and longitude. Each dataset on average...

• Replies: 2
• Views: 2,350
01-14-2017, 05:08 PM
6. ### Sampling distribution

Hi, I have to calculate mean and standard deviation of sample means of size 30 (with replacement) from a population of size 87. Its impossible to...

• Replies: 0
• Views: 1,237
10-30-2012, 06:39 PM
7. ### Who can help me solve this problem, Thanks !!!!!!!

Let y denote the sample average from a random sample with mean u and variance V, consider two alternative estimators of u, W1=, W2=y/2; Question...

• Replies: 1
• Views: 2,164
09-22-2014, 09:49 PM
8. ### Standard Deviation - Moving Range

I would like to create an individuals control chart. I need to calculate the standard deviation using moving range. I was given the answer of 3.39. I...

• Replies: 15
• Views: 4,943
07-15-2015, 03:04 PM
9. ### Errors and Standard Deviation

Hello dear all! What type of error can be calculated if I have two replicates of each sample I measure? To calculate the standard deviation we...

• Replies: 4
• Views: 2,038
06-10-2011, 02:41 PM
10. ### Is Central Limit Theorm true for other statistics

Dear friends, I have a question regarding Central Limit Theorem (CLT): Is Central Limit Theorm (CLT) true for other statistics such as variance,...

• Replies: 17
• Views: 6,936
07-08-2012, 09:37 AM
11. ### Why data standardization is necessary in Prinicple Component Analysis (PCA) ?

Dear Guys, Hi. Generally the PCA process is described as follows: 1: Get some data 2: Standardize the data 3: Calculate the covariance matrix...

• Replies: 0
• Views: 2,792
11-05-2011, 05:53 AM
12. ### sequencing in m-balls and n-bins

Hi, I'm doing my graduate study in computer science and I faced the following question in my thesis. suppose there are n bins and m balls. we...

• Replies: 4
• Views: 2,913
01-14-2015, 03:19 PM
13. ### t-test for very low continues scores

Hi, I have two dependent variabels (suicide related thoughts and suicide related behaviors) as these are present in very small percentage of...

• Replies: 0
• Views: 1,597
03-04-2009, 12:44 PM
14. ### using odds ratio for correlation

Hi, we are working on a study using findings from 13 different countries on relation of substance use on suicide ideation and attempt. We...

• Replies: 1
• Views: 1,475
03-24-2015, 08:26 AM
15. ### Math Stat question

im stuck with this question: Consider the prior distribution for the Bernouli parameter p with p.d.f g(p) proportional to 1/sqrt(p(1-p) for...

• Replies: 1
• Views: 3,628
BGM
12-16-2010, 11:28 AM
16. ### Variance

If mean squared error is the variance: varX-bar=((theta)^2)/12 How does var2X-bar look like? Hope someone can help! Thanks!

• Replies: 3
• Views: 2,282
12-16-2010, 10:06 PM
17. ### Fiducial Limits?

Would anyone have even the slightest knowledge on this topic? I'm tying to get a general term for multiple lines/slopes on the one graph (would...

• Replies: 0
• Views: 5,574
06-04-2009, 05:51 AM
18. ### How to compare groups with multiple categorical variables

Hi: I need to compare to compare two groups with multiple categorical variables_ I cannot quite figure out how to do it in one analysis: i am...

• Replies: 0
• Views: 1,884
07-09-2014, 11:03 PM
19. ### Propagate errors

Hi I would like to ask this . Suppose that I have a really large sample, and I put the results of my observable in a histogram of N bins ....

• Replies: 4
• Views: 2,877
10-30-2010, 10:24 AM
20. ### [Exact Multinomial Test] Chi square Goodness-of-fit with expected frequencies of 0

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• Replies: 1
• Views: 2,113
11-07-2013, 12:13 AM
21. ### For Process Capability, what is Null Hypothesis

1) That the ratio between the specs and the process spread should be one 2) That the ratio between the specs and the process spread should be larger...

• Replies: 2
• Views: 3,845
03-02-2015, 08:00 AM
22. ### Recently, steps have been made to substantially improve the process.

Recently, steps have been made to substantially improve the process. A P chart has been plotted for some time. One would not be surprised to find...

• Replies: 0
• Views: 2,712
03-02-2015, 07:32 PM
23. ### (> one hour invested)

I have spent more time than I should this one. Given that P(A or B) = 1/4, P(A) = 1/7, and P(A and B) = 1/9, find P(B). I've worked it many...

• Replies: 1
• Views: 1,380
BGM
10-09-2012, 04:16 AM
24. ### Who's a Gambler?

This is a fun one. The P(A) = 3/5. Find the "odds" of winning an A.

• Replies: 5
• Views: 1,781
10-09-2012, 12:04 PM
25. ### Help with matrices?

If X' X = (50, 300 ) (300, 1000) what is X? I can't seem to get four equations for the four unknowns, any help?

• Replies: 4
• Views: 2,170
10-25-2011, 02:07 PM
26. ### single and two tailed question analysis

Hi, and thanks for reading this.:yup: i have a study i've been doing, having received the 50 responses and now have to analyse the results. The...

• Replies: 0
• Views: 1,796
01-23-2010, 04:44 AM
27. ### Which hypothesis test to use

I'm doing an assignment and am just a bit rusty and confused. I don't want the answer to the question, just guidance on what sort of test to use. ...

• Replies: 2
• Views: 1,206
09-14-2016, 09:40 AM
28. ### Project Guidance

I'm designing a study of online reader comments to newspaper stories. Constructed two-week sample (representing three-month period) for six daily...

• Replies: 1
• Views: 1,805
11-29-2011, 08:00 PM
29. ### Need help finding statistical forecasting method or formula.....

I’ve typically used historical production results to forecasting future production results; however, the past few years have presented us with some...

• Replies: 0
• Views: 2,540
05-11-2010, 10:11 AM
30. ### Significance levels

I was wondering if there was a statistical test that could be done that would compare one significance level to another?

• Replies: 2
• Views: 2,487
12-04-2008, 09:47 PM
31. ### stats help!!!

I have a question for youo.... I am not quite understand how to pick which formlulas for the different test when i have one tail and two tail...

• Replies: 2
• Views: 2,632
11-22-2006, 06:10 PM
32. ### Chi Squared forumla

Hi--- I have written in my notes to formulas and i was just wondering if they are the same thing.... the first one is X squared = the sum...

• Replies: 2
• Views: 3,207
11-24-2006, 11:56 AM
33. ### one tail or two tail tests

Hello! I just have a quick question! How do I figure out whether I have one tail or a two tail test? This is the part where I am confused? So if...

• Replies: 1
• Views: 5,496
11-27-2006, 10:29 AM
34. ### Anyone has The Practice of Statistics Prep for the AP Exam Supplement book?

Does anybody has The Practice of Statistics Prep for the AP Exam Supplement book? Look like this...

• Replies: 0
• Views: 5,219
06-07-2010, 10:27 PM

Here is the question: Determine if there is a difference in the proportion of votes he received in the two counties. N = Total # of...

• Replies: 1
• Views: 2,739
12-06-2008, 05:41 PM
36. ### MLE help

Hey guys, I've a Linear Models assignment due in 3 weeks. Really appreciate some help in certain area(s). Here's the first part: I'll explain the...

• Replies: 4
• Views: 2,552
11-20-2009, 05:23 PM
37. ### P value from ANOVA tables

Can someone please remind me how we calculate p values from given F values on the ANOVA tables. (using the tables).

• Replies: 1
• Views: 2,450
11-16-2009, 02:47 AM

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: 1,625
05-07-2007, 08:57 AM
39. ### Probability help

I'm trying to set up a probability analysis to determine if a recall is necessary. We found one of our 13 machines started to break down fairly...

• Replies: 0
• Views: 1,835
10-13-2006, 11:53 AM
40. ### is a paired sample better?

What is the benefit (or not) of designing your project with paired subjects?

• Replies: 0
• Views: 2,048
04-24-2009, 07:49 AM
41. ### Autocorrelation and comparing means......

Hi All, I might be totally missing a key point here - or making a mountain out of a molehill, but I have been reading around and trying to find the...

• Replies: 1
• Views: 2,206
04-07-2012, 09:05 AM
42. ### How best to account for seasonality when analysing bird monitoring data

Hello All, I have some monitoring data from seabird surveys carried out in an offshore construction site. Surveys were undertaken before, during...

• Replies: 1
• Views: 1,603
09-30-2012, 01:43 AM
43. ### Probability situation HELP!

A special school size of 1,500 students, with 60% boys and 40% girls. Each day, the principle chooses 10 students for cleaning bathrooms but does not...

• Replies: 1
• Views: 3,136
01-29-2013, 11:11 PM
44. ### Post-hoc sample size analysis

Hi, I'm new to the forums, I'm hoping I post it in the right place. I'm doing an MSc dissertation at the moment. I have the programme SPSS sample...

• Replies: 1
• Views: 2,654
08-25-2011, 04:32 PM
45. ### Interesting correlation problem

This message has been relocated to a different chapter

• Replies: 0
• Views: 2,275
01-04-2011, 11:50 AM
46. ### Central Composite Results Conflict with One-Way ANOVA results

I have a project that I have been working on. I designed a half central composite with 5 factors and 5 levels. I had a total of 33 samples. From that...

• Replies: 0
• Views: 4,715
08-03-2010, 12:38 PM

Hi all Can I get some help from you, I am a research student I developed questionnaire to get some information but after I get the results I am...

• Replies: 2
• Views: 2,476
08-18-2006, 05:43 AM
48. ### Standardizing or normalizing two different sales variables before regression?

Hello there :wave:, I'm currently involved in research, but I have to admit that I'm quite insecure in my math / statistics abilities, which is...

• Replies: 0
• Views: 2,584
04-03-2014, 09:43 AM
49. ### Which test for my data analysis?

Following this paragraph is my method to my research proposal. The next step I need to do is the planned analysis. I have absolutely no idea how to...

• Replies: 1
• Views: 1,612
11-06-2013, 02:27 PM
50. ### Roulette Probability Problem

Hello all, I am having trouble with solving this roulette problem. Play double zero roulette game. Pick odd/even +1, -1, (18/38) and (20/38)...

• Replies: 1
• Views: 3,926
11-16-2006, 11:07 PM
51. ### ancova

Hello, I have a set of data (Xi,Yi) to which I fit a curve: Y=a*X^b, I use matlab to determine a and b. I also have a model equation: Y=a0*X^b0....

• Replies: 0
• Views: 1,130
09-23-2013, 05:41 PM
52. ### Analysing ranked data

I had following question in my questionnaire: Rank following factors: price, quality, advertisement, brand, reference from 1 (very important) to 5...

• Replies: 0
• Views: 1,424
09-22-2014, 10:09 AM
53. ### Regression analysis of ranked data

The depended variable is Binary data and independent variables are ranks from 1 to 5. What methods i suppose to use in order to see relationship...

• Replies: 3
• Views: 1,987
09-23-2014, 07:26 AM
54. ### Determining sample dependence

How do you determine if samples are independent? I know that test scores of two separate groups of students are independent. Before-and-after...

• Replies: 1
• Views: 1,234
12-06-2012, 11:38 PM
55. ### Help Selecting a Model

People, First of all, this is my first time in this forum, so hello to everyone. That said, I am working on a class investigation concerning...

• Replies: 0
• Views: 1,874
02-22-2009, 12:35 PM
56. ### Planned pairwise comparisons

In running the contrast analyses, when looking at the tests of within subjects effects, sphericity is violated. Do I need to adjust the degrees of...

• Replies: 0
• Views: 5,031
12-03-2009, 08:34 PM
57. ### Can Phi Coefficient be used as an effect size for Chi-Square Goodness of Fit tests?

Flip a coin 100 times -> 48 H, 52 T Null - coin follows a specified distribution Run a chi-square goodness of fit test using 48, 52 and 50, 50 I...

• Replies: 1
• Views: 4,864
04-28-2011, 05:13 PM
58. ### Light bulbs problem

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• Replies: 0
• Views: 1,565
10-21-2012, 12:31 PM

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