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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: 66,990
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: 197,217
07-16-2014, 11:01 AM
1. ### Prediction interval question

I have data fit with a loess curve. The predictor is time. I want to know what time has the highest predicted observation and the time's confidence...

• Replies: 4
• Views: 1,367
agp
04-28-2013, 11:29 AM
2. ### Addressing intraclass correlation coefficient issues

ICC estimates changes according to the magnitude of the data. If the data are >1, ICC values are going to be way closer to 1 than if the data are...

• Replies: 0
• Views: 1,567
agp
03-17-2013, 04:28 PM
3. ### Statistics - Visualization

There is only so much excel, SAS, R, JMP, and whatever software you use can do in terms of helping people understand your data. I want to explore...

• Replies: 9
• Views: 1,974
06-21-2014, 04:46 PM
4. ### What analysis is needed to answer a question like this?

Hi everybody, I am working on a project to analyze the financial characteristics of customers who purchase product A versus customers who purchase...

• Replies: 2
• Views: 1,666
agp
02-14-2014, 11:14 AM
5. ### Visualizing variance

I have fit a logistic regression model and repeated it many times on bootstrapped populations. The variables are not standardized. Is there an easy...

• Replies: 0
• Views: 1,401
agp
02-24-2016, 10:50 AM
6. ### Randomized Complete Block Design (question about my design)

Hello all- this is my first post on this lovely looking forum. This may be an advanced question! I would very much be grateful for any help. I...

• Replies: 5
• Views: 2,160
05-12-2015, 12:19 PM
7. ### Comparing Survey Results

I just recently administered two surveys testing the effectiveness of a product. Each survey consisted of the same 3 questions and were answered on a...

• Replies: 0
• Views: 3,685
11-14-2012, 10:28 PM
8. ### Which test(s) should I use?

I need to test for statistical significance in 2 groups (95% confidence) : a control and a group given a different treatment. Each treatment and...

• Replies: 0
• Views: 1,374
07-08-2012, 06:29 PM
9. ### This Thread has easy example dataset! :D Help choose the right test please!

We're trying to test whether there is a difference in length of visit (in minutes) between our original website and: Revamped Website #1 Revamped...

• Replies: 1
• Views: 353
07-03-2017, 04:07 PM
10. ### Sig Test

Uhhhhh!!!! I don't know what the heck I'm doing. Two samples.... Sample one.... let's call them the 'hairy helmets'.... # = 49, mean = .83,...

• Replies: 10
• Views: 4,102
08-24-2011, 06:13 PM
11. ### "Variance" by STDEV and Different Means

Im trying to measure 'consistency' in baseball scores amongst two different sample groups. For example, in a sample of 162 games each, one team...

• Replies: 5
• Views: 2,396
07-03-2012, 04:32 AM
12. ### Significance Test

PA in Sample Avg MLE Avg Result MLE Performance 3688 0.244116701 0.244432733 1.001294594 3513 0.241003236 0.235666705 0.977857015...

• Replies: 0
• Views: 1,489
07-04-2012, 01:22 PM
13. ### Sig Test of Frequency

Wondering how I approach this question.... Don't need it done for me (and it's not homework, btw)... but if somebody could point me in the right...

• Replies: 1
• Views: 2,298
08-20-2012, 12:36 PM
14. ### subpopulation

Suppose we have a group of 1000 customers, 100 customers are selected for a marketing pilot study. We want to know first if these 100 customers have...

• Replies: 0
• Views: 1,966
10-04-2010, 01:14 PM
15. ### Which test method?

Group A Data: 2010-01: 100, 20, 20% => Units Made=100, Good Units=20, Yield Rate=20% 2010-02: 100, 25, 25% 2010-03: 200, 60, 30% 2010-04: ...

• Replies: 1
• Views: 1,954
10-05-2010, 02:19 PM
16. ### how to characterize discrepencies

Suppose there are 3 company(C1, C2, C3) buying parts from 3 wholesalers(W1, W2, W3). Suppose there are 1000 parts in the catalog. For a particular...

• Replies: 1
• Views: 2,050
10-29-2010, 09:30 PM
17. ### mean

Suppose my data contains # of visiting customers for each XYZ store for a given month. Suppose there are 200 XYZ stores and the total number of...

• Replies: 1
• Views: 1,452
05-12-2011, 09:10 PM
18. ### Cohen's d for one-sample/paired-samples vs. independent samples, and pooled SDs

I have a few questions for you all about Cohen's d and pooled SDs! This is my first post, hope it goes in line with forum guidelines. 1)...

• Replies: 0
• Views: 8,897
06-07-2012, 12:46 PM
19. ### homework help

Hi, I have been working on my assignment all day and came to this problem, I am not sure what to calculate to get the answers requested, any help...

• Replies: 3
• Views: 5,684
04-06-2011, 03:17 PM
20. ### Testing for differences in productivity

Hi guys, Given a sample dataset like this: Machine Units Produced Time taken A 100 2 A 200 3...

• Replies: 1
• Views: 940
06-07-2015, 10:52 AM
21. ### Parametric or non-parametric test ?

Dear the members of group. I have 2 questions regarding my research which has 8 variables in which 6 of them are normally distributed and the rest...

• Replies: 2
• Views: 2,374
06-11-2013, 10:28 PM
22. ### probability

Four union men, two from a minority group, are assigned to four distinctly different one-man jobs, which can be ranked in order of desirability. ...

• Replies: 1
• Views: 1,846
BGM
02-05-2012, 05:44 AM
23. ### Median and quartiles

Hello dear mates; WHY the value of median and quartiles are non-unique ? thank you

• Replies: 2
• Views: 1,349
10-09-2015, 03:13 PM
24. ### can someone solve this ?

• Replies: 4
• Views: 1,859
12-16-2012, 04:16 AM
25. ### tough one !

Hello guys , actually I got this problem as a bonus question to be delivered ASAP , I busted my ass trying to even start with it but I couldn't ! ...

• Replies: 0
• Views: 880
12-21-2012, 11:29 AM
26. ### Is this a correct statement in statistics ?

Hi All, I was reading in one paper the following: "All the results have been obtained by averaging over a number of experiments large enough to...

• Replies: 0
• Views: 2,295
03-30-2011, 05:49 PM
27. ### Meta Analysis-Scales

Hi, I am new into meta analysis and doing research on spirituality in organizations. I want to collect all scales and their results(on...

• Replies: 0
• Views: 1,036
02-05-2017, 01:09 AM
28. ### Interesting Stats Question: Verifying Algorithmic Trading Returns

Hey guys, First off, thank you to anyone who helps out! I haven't been in statistics for a while and, quite honestly, learning the T-Test online...

• Replies: 0
• Views: 1,222
10-13-2014, 09:33 PM
29. ### CI for population proportions

I am trying to figure out what criteria makes the CI interval valid. I am hoping someone could help me out. Thank you for your time.

• Replies: 1
• Views: 1,745
04-02-2012, 09:06 AM
30. ### Linear regression & correlation for time series data

Hi all, I've searched wide and can only find warnings about NOT applying common linear regression and correlation statistics to time series data,...

• Replies: 2
• Views: 1,734
09-27-2012, 10:52 PM
31. ### Appropriate to use time as covariable in ANCOVA?

Hello stats people, I need to assess whether the rate of increase (in soil carbon) differs significantly between two groups (forests). I believe...

• Replies: 11
• Views: 2,923
09-30-2012, 10:50 PM
32. ### Working out standard deviation for three random variables with different sized ranges

X = {1,2,3,4,5,6}, Y = {1,2,3,4}, Z = {2,4,6,8}. The question is: work out standard deviation of A = 2S-1, where S = the sum of the three random...

• Replies: 0
• Views: 1,198
06-12-2016, 05:45 PM
33. ### Quick help - may be easy for any stats student

Hi, I have a question: In our company , we have a sampling criteria to judge quality, i would like to know which formula to use. We are a company...

• Replies: 0
• Views: 956
12-06-2013, 05:14 PM
34. ### t-stat and p-value

Dear all, I have estimated several regressions using loop. I have managed to save the estimated alphas as new variables. Now I need to obtain the...

• Replies: 4
• Views: 2,089
07-17-2014, 05:56 PM
35. ### I need help on a statistics project

Private message me if you'd like to help me out...pretty please :confused:

• Replies: 0
• Views: 2,419
12-12-2016, 12:51 AM
36. ### Dependence of Bimodal Distribution Analysis on Sample Size

Hi, Recently a friend asked a question which we could not come up with an answer, it is most probably easy to answer. In an experiment there...

• Replies: 0
• Views: 3,163
05-07-2012, 11:10 AM
37. ### Help choosing apropriate test

Hi to all, What is an appropriate inferential test to determine if several variables are interrelated. For example, Does age, income, test score,...

• Replies: 0
• Views: 1,767
04-09-2008, 05:56 PM
38. ### degrees of freedom in a survey

Removed question........

• Replies: 1
• Views: 464
07-07-2017, 12:08 PM
39. ### Setting up a database for election results

Dear all I am trying to analyse some election data with the ultimate aim of building a predictive model. The elections use STV so I am...

• Replies: 5
• Views: 2,757
11-17-2009, 05:25 PM
40. ### CLT and sample distribution of sample mean

On a particular stretch of highway, the state police know that the average speed is 62 mph with a standard deviation of 5 mph. On a busy holiday...

• Replies: 1
• Views: 3,671
10-21-2014, 10:25 AM
41. ### Data varies with Date. how to measure overall change

Hi everyone, I am new to statistics. A little help would be much appreciated. I have a data ( volume) which looks like this: Cities ...

• Replies: 0
• Views: 1,101
07-26-2015, 10:52 AM
42. ### fishers exact/shi sq assistance

Hi, I am a very novice researcher and need some advice re: fishers exact test (FET). My knowledge of statistics is poor to say the least so please...

• Replies: 0
• Views: 1,625
08-11-2011, 07:58 AM
43. ### Help ASAP

I have no idea how to solve any of this... I think my one problem is I am sick my other problem is I may need a tutor (any recommendations). Any help...

• Replies: 0
• Views: 2,330
11-09-2008, 07:38 PM
44. ### Would I run an ANOVA or MANCOVA

It is this lame question that I have to answer about redesigning a study. It is completely hypothetical. So I don't have everything I should have. i...

• Replies: 0
• Views: 1,624
06-26-2016, 02:33 PM
45. ### Which method of data analysis

Okay so I am tired. here is my issue. If I have a three data sets Parents education Student gender And student pre&post test scores ...

• Replies: 2
• Views: 1,279
06-26-2016, 06:40 AM
46. ### Statisitical method to assess the competency of an individual?

I will summarise my problem first. I want to write a platform for reviewing doctors in a country. The names of doctors will be added by the users...

• Replies: 1
• Views: 1,211
05-19-2015, 02:49 PM

This my first posting. The Bank wants to estimate the mean dollars that each card holder will spend each month. It would like to be within plus...

• Replies: 3
• Views: 4,288
10-30-2005, 06:52 PM
48. ### question on 2 tailed Z test

If you performed a 2 tailed z test with alpha= 0.05, the null hypothesis will be rejected if the computed value of the z stats is higher than ______...

• Replies: 1
• Views: 4,950
02-24-2006, 02:40 PM
49. ### question on research problem

I'm having some trouble with conducting a hypothesis test: Suppose it has been esablished that musicians, as a general population, have a mean IQ...

• Replies: 1
• Views: 2,278
02-24-2006, 03:20 PM
50. ### Question on decision rule

I'm a little confused on how to make a decision rule given an alpha value. For example if the problem was a two ailed z test with a alpha of .03,...

• Replies: 3
• Views: 12,930
03-03-2006, 02:17 PM
51. ### 95% confidence interval

I'm not sure how to construct a 95% confidence interval for a one tailed test. I know that for a two tailed test, it's just the critical value...

• Replies: 1
• Views: 3,054
03-03-2006, 03:13 PM

Im a little confused about the difference between a t test for one sample, for two independent sample, and two related samples. For this problem: ...

• Replies: 3
• Views: 2,593
03-10-2006, 04:20 PM
53. ### t-test

I'm confused about when to use a t test for two independent samples and when to use a repeated measures t test. When there is a pacebo group in an...

• Replies: 1
• Views: 1,912
03-16-2006, 08:49 AM
54. ### p value

when finding p value for chi square test or t test, does it matter whether it's a one sample or two sample test? EX: in order to find the p value...

• Replies: 1
• Views: 2,268
03-17-2006, 12:07 PM
55. ### Instructions on how to install a package in R

I am trying to install a package in R called RMySQL, but the package comes in a .tar.gz file. I have only installed packages in R that self-install....

• Replies: 3
• Views: 1,769
06-08-2012, 06:24 PM

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