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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: 200,392
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: 68,590
09-30-2005, 09:44 AM
1. ### Mean vs Standard Deviation Exercise

Hey everyone. I would like to know your opinion on the following exercise: We have 2 coders teams (A and B). We want to choose the team who...

• Replies: 4
• Views: 2,679
07-06-2016, 01:38 PM
2. ### What test to use with 1 group?

Hello Please provide assistance on what test to use for: 1 group with n = 500 Research QS: Is listening to whistling a problem? Question...

• Replies: 1
• Views: 1,363
07-06-2016, 05:04 AM
3. ### Normal distribution

Hi, X ~ Normal(15,8) Y ~ Normal 10, 6) How can I calculate Prob (X>Y)? if: (a) X and Y are not depending on each other with 0 correlation

• Replies: 1
• Views: 1,153
07-05-2016, 02:37 AM
4. ### Chi square test of independence - test of difference or association?

Hi everyone, I understand chi square tests of independence, and have read the FAQ on chi square tests. What confuses me somewhat is the use of chi...

• Replies: 20
• Views: 4,345
07-05-2016, 01:42 AM
5. ### Creating standard normal distribution with difference variances within quartiles

Hi, I have 10,000 data points referring to data on dogs that follow a positively skewed distribution that I have grouped into quartiles. I...

• Replies: 0
• Views: 1,016
07-04-2016, 05:08 PM
6. ### spss- questionnaire of two different groups

hey there i have a questionnaire likert scale, which was filled be various colleges of both public and private sector. i have started to enter the...

• Replies: 0
• Views: 1,287
07-03-2016, 10:15 AM
7. ### Predicted variable

Dear all, I need help how to predict the hours variable from the model below. I used the mixed logit and have as a dependent variable y and hours...

• Replies: 1
• Views: 1,451
07-03-2016, 08:47 AM
8. ### Power Calculation

Hi Guys, Need your help please. I performed a study- 2 groups (independent) both had 55 patients. However my supervisor advises that I perform a...

• Replies: 6
• Views: 1,629
07-02-2016, 05:26 AM
9. ### Correlations computed within subject vs collapsing across subjects

Hi everyone, I have model predictions (x) that I want to test against subject ratings (y). There are 20 stimuli per subject and I have data from...

• Replies: 0
• Views: 1,650
07-02-2016, 02:02 AM
10. ### Bayes' formula question help

One percent of population cannot drive even if they try very very hard, but everyone applies for the driving license. The driving test fails those...

• Replies: 1
• Views: 2,051
07-01-2016, 05:06 PM
11. ### Comparing two correlation coefficients

I am trying to compare 2 independent correlation coefficients. Can I compare 2 independent rs using fisher z transformation test which one is a...

• Replies: 4
• Views: 2,412
07-01-2016, 08:06 AM
12. ### Confidence Intervals for Proportions -- Two ways to estimate population value?

Hi everyone, I'm wondering if anyone could help shed some light on why there appear to be two different ways that different textbooks show to...

• Replies: 8
• Views: 1,611
06-30-2016, 10:35 PM
13. ### Confidence Interval

Hi all, I have a question for you that I hope one of you can answer: You sample 29 apples from your farm's harvest of 291 apples. The mean...

• Replies: 3
• Views: 1,433
06-30-2016, 05:32 PM
14. ### Chi-square test of independence - post-hoc test for a r x c table

Hi everyone, I have a question about chisq post-hoc tests. I'm analyzing a 4 x 7 contingency table. When running a chisq test of independence, I...

• Replies: 2
• Views: 1,378
06-30-2016, 02:09 PM
15. ### Sample size needed?

Hello. I am trying to determine how many samples I would need in order to get 90% of all the subjects within +/-15% of a value. In other words,...

• Replies: 0
• Views: 1,319
06-30-2016, 01:11 PM
16. ### reliability effects components of variance

Hello TalkStats community. I'm currently stuck with a problem, concerning how reliability of a process effects the variance of the process. let...

• Replies: 1
• Views: 2,451
06-30-2016, 06:50 AM
17. ### prediction of yearly order number

Hi everyone, I am writing my master thesis In TUHH university of hamburg. In a part of my thesis i need the daily number of customer's order of...

• Replies: 0
• Views: 1,686
06-30-2016, 02:09 AM
18. ### Confidence Interval for mean

Hello in a statistical problem, the population standard deviation was given to be 3 and the sample size is 49. in the problem i was asked to use 99%...

• Replies: 1
• Views: 1,330
06-29-2016, 09:31 PM
19. ### Need help determining what test to use

Hello, I would like to ask for help determining what test to use. In my assignment I need to determine if different candy causes cavities in...

• Replies: 2
• Views: 1,600
06-29-2016, 11:27 AM
20. ### Significance test with one replicate (Biology)

Hello everybody, I am new and and not that skilled in statistics. I think I have a quite simple question for you guys :) I am a biologist and I...

• Replies: 0
• Views: 1,316
06-28-2016, 10:06 AM
21. ### Ideal process of regression for amall samples

I have a sample having 19 observations and 4 variables. Please tell me, which method of regression can be used here. Could I Cox's model of...

• Replies: 0
• Views: 1,315
06-28-2016, 05:11 AM
22. ### Finding threshold

Hello, I'm a geographic student and I'm studying time series of vegetation index. I'm french and even if I'm quite fluent in communicating in...

• Replies: 4
• Views: 1,328
06-27-2016, 02:20 AM
23. ### Two IVs with three levels

Hi, I'm a complete n00b when it comes to statistics, and I'm struggling to decide on the design for a statistics test, so I was wondering if...

• Replies: 0
• Views: 1,328
06-26-2016, 03:50 PM
24. ### 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: 1,743
06-26-2016, 02:33 PM
25. ### Is there any other way to get LD50 for these cases when Probit does not yield results

To determine a lethal dose 50 (LD50) (ie the dose or concentration of a compound that kills 50% of the insects) I have done a Probit regression. In...

• Replies: 1
• Views: 1,465
06-26-2016, 12:30 PM
26. ### 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: 1,411
06-26-2016, 06:40 AM
27. ### Basic terminology

I'm doing a research paper in international relations and I need some help describing the data. For example, in 13 interventions in civil wars, I...

• Replies: 0
• Views: 1,938
06-25-2016, 08:55 PM
28. ### Lognormal distribution area within 1 standard deviation

For a normal distribution I understand that area to left or right of mean within 1 standard deviation is same. What about log normal distribution,...

• Replies: 0
• Views: 1,536
06-23-2016, 12:45 PM
29. ### Interpreting the Spearman's correlation test coefficient and p-value

I am currently trying to figure out how to use SPSS and understand the results that are generated by the different tests I'm performing on my data. ...

• Replies: 0
• Views: 954
06-23-2016, 09:23 AM
30. ### Specifying the initial values of likfit function of geodata in R

I have a geostatistical data. For analysis, I am using `geoR`. I want to estimate the parameters. But `likfit` or `variofit` function requires...

• Replies: 2
• Views: 1,522
06-23-2016, 05:48 AM
31. ### Why square root of n for standard error?

Hi, I am trying to understand the formula for the standard error of the mean. OK so far, but: I don't understand why it is the square root of n...

• Replies: 4
• Views: 2,762
06-22-2016, 11:26 AM
32. ### interaction with covariate

Hi, I'm running with SPSSS a repeated measure anova with 2 independent variables (let say A and B) and 1 covariate, C. I observe that: A X B...

• Replies: 0
• Views: 955
06-22-2016, 11:11 AM
33. ### Large t values

Hi, I'm studying the use of certain teaching techniques in Korean high schools, specifically comparing students' perceptions of the frequency of...

• Replies: 1
• Views: 1,280
06-22-2016, 11:00 AM
34. ### Which test do I have to use?

Hi! I hope someone can help me out with the following problem. I'm not the best at statistics... So I got 5 gorilla's which I observed. For...

• Replies: 1
• Views: 1,385
06-22-2016, 06:50 AM
35. ### Comparing data from single samples

I measured mutations after drug treatment in two different lines (genotype A and B) at 3 different timepoints (1,2,3). Is there a test to see whether...

• Replies: 3
• Views: 2,064
06-22-2016, 06:02 AM
36. ### Trying to establish a fair evaluation system for a company.. need help!

I work for HR department of a company. Every year, different managers evaluate different employees. We are trying to upgrade our evaluation...

• Replies: 0
• Views: 1,432
06-22-2016, 04:46 AM
37. ### how to compare samples with single observations

Hi I have a data for water sample genotoxicity. All data consists of single observations and no replicates. I want to compare samples with negative...

• Replies: 2
• Views: 1,420
sk2
06-22-2016, 03:34 AM
38. ### Homework Help Please :)

I am taking an online college course for Statistics and I am struggling.. I find it really hard to teach yourself statistics without a teacher's...

• Replies: 2
• Views: 2,015
06-21-2016, 08:46 PM
39. ### Regression with different lengths of data series

Dear All, I am trying to do a multivariate regression, i.e. y = ax1+bx2. but x1 has data from year 1 to year 30, but x2 has only year 20 to year...

• Replies: 0
• Views: 1,043
06-21-2016, 10:26 AM
40. ### Quick homework question

Suppose X has density f, and Y has density g, is it possible that f(x) > g(x) for all x? Explain. I'm assuming the answer is no, but not sure how...

• Replies: 0
• Views: 1,216
gat
06-21-2016, 03:24 AM
41. ### Winning chance

Would welcome statistical advice to maximize my winning chances with this game : A store gives out cards with four rub-off squares. Underneath...

• Replies: 0
• Views: 1,435
06-20-2016, 03:34 PM
42. ### LOF : Local Outlier Factor

I have a few questions about Lof : http://www.dbs.ifi.lmu.de/Publikationen/Papers/LOF.pdf 1. I don't understand of k-distance(o) inside...

• Replies: 0
• Views: 1,740
06-20-2016, 08:38 AM
43. ### Using Pre-Post data in a meta-analysis

Hello, I am trying to figure out the best way to calculate an effect size for a single-group design when I do not know the pair-wise correlation...

• Replies: 4
• Views: 1,997
06-20-2016, 08:22 AM
44. ### Successive Probabilistic Events

I have some secret code that I need to hack so I know what it is saying. In a single event I pass the problem to four computers in succession. The...

• Replies: 2
• Views: 1,215
06-20-2016, 02:18 AM
45. ### Market Mix Models : Confidence in Coefficients

In market mix models, my sales(y) depends on 4 promotions(p1--p4). Let (b11, b21, b31, b41 ) be the coefficients of p1--p4 in one iteration and (b12,...

• Replies: 0
• Views: 918
06-19-2016, 02:55 PM
46. ### Inquiry about means comparision of factorial experiments

urgent and important dear, friends I need clarification about comparison between interaction of treatments. If I've factorial experiment (2*3) with...

• Replies: 1
• Views: 1,319
06-17-2016, 11:55 AM
47. ### Separating Skill from Randomness in Binomials (baseball)

With a stat like On-Base Percentage (OBP) in baseball, we can treat a sample of different players' stats as a mixture of both random binomial...

• Replies: 1
• Views: 1,208
06-17-2016, 11:53 AM
48. ### Survey design question

I am designing a household survey with a sample size of 400. This is a two stage design with 40 clusters selected at first stage and 10 households...

• Replies: 1
• Views: 1,203
06-17-2016, 11:53 AM
49. ### What test to use? 2 IV & 1 DV

Hello everybody, I am currently stuck in my analysis with a probably very simple question. I have a continous dependent variable (1-5) and an...

• Replies: 0
• Views: 1,424
06-17-2016, 09:05 AM
50. ### (R) Analysing abundance in plots with different treatments -with factorial ANOVA?

I'm not connected to a Uni anymore, but want to write an article on my friend's data from her Master's while applying for a Phd. The data will...

• Replies: 0
• Views: 1,072
06-17-2016, 03:22 AM
51. ### SPSS: correlate or regression in broad form

Hey! I was wondering, I have 5 dependent variables and 2 within subject factors with 2 conditions. These are in a broad structure in SPSS, which...

• Replies: 0
• Views: 983
Ros
06-17-2016, 03:04 AM
52. ### What tests to unleash on the data?

Hey everyone! So here's some background: I'm doing a course on data-analysis and my teacher likes the idea of us finding our own solutions, so...

• Replies: 0
• Views: 1,642
06-16-2016, 11:07 AM
53. ### How to calculate individual mean for all elements ?

Hi , Can anyboby tell me how to do calculate mean for each and every elements? 1,2,3,4,5 = Normal mean= 3 it is well known , obvious, average...

• Replies: 0
• Views: 1,441
06-16-2016, 06:20 AM

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