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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: 197,214
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: 66,988
09-30-2005, 09:44 AM
1. ### OC Curve Program

One of my friends has asked me to help him write a program to calculate the "n" and "c" values (sampling size, accept number), only given...

• Replies: 0
• Views: 1,799
05-06-2013, 07:44 PM
2. ### A bit basic but....Help!

Honestly this problem put me into a stump. I'm used t having set of data values, but now I'm just confused on this. I am just starting statistics so...

• Replies: 1
• Views: 3,281
05-06-2013, 06:48 PM
3. ### Calculating Probability from Mean and standard deviation

Hello, im having difficulty in solving the following problem, Could anyone please solve this. Lifts usually have signs indicating their maximum...

• Replies: 2
• Views: 2,850
05-06-2013, 01:32 PM
4. ### coefficient of variation

I would like to check the reliability of my test retest study. Different raters measured height and weight twice (visits 1 week apart) on 5...

• Replies: 1
• Views: 1,528
05-06-2013, 11:58 AM
5. ### Repeated Measures ANCOVA - questions on covariates and output

Hello everybody, I need some help with a RM ANOVA or ANCOVA. I have to help an intern at my department with her analyses but don't the answers...

• Replies: 0
• Views: 1,544
05-06-2013, 10:46 AM
6. ### 2 x 2 data, statistical test

Hi, This is a simple question, but what is the appropriate statistical test for the following situation. ...

• Replies: 3
• Views: 1,815
05-06-2013, 06:28 AM
7. ### Estimation and Hypothesis Testing

Hey, I'm new here, hope this is the right spot for this. I was very good at understanding this information when we moved in sections because I knew...

• Replies: 1
• Views: 1,161
05-05-2013, 05:17 PM
8. ### Fractional Factorial Experiment Design

I know that to get the alias rows with the main factor effects, I use mod 2 multiplication with the main effects and the elements of the defining...

• Replies: 0
• Views: 894
05-05-2013, 01:06 PM
9. ### standardised indirect effects in multimediational analysis

Hi I have been using Andrew Hayes PROCESS to calculate indirect effects in a multimediational model. Is there a way to calculate standardized or...

• Replies: 0
• Views: 1,794
05-05-2013, 07:17 AM
10. ### Two different populations?

I posted a while ago about a project that I had to do and I think I got it but I have a question. I'm doing it on graduation rates in America...

• Replies: 1
• Views: 1,544
05-05-2013, 01:56 AM
11. ### T-test

I'm carrying out a t-test 'by hand' in R. H0: mean = 0, H1: mean != 0. Sample is 9, 10, 11, 10, 10. Sample mean is 10, with standard...

• Replies: 11
• Views: 2,120
05-04-2013, 09:19 PM
12. ### Split testing emails. Trying to build a calculator in PHP but don't remember stats

Yea, I got a perfect score on AP statistics but I am totally defeated by this problem which is probably quite simple. I'm testing two emails with...

• Replies: 1
• Views: 1,800
05-04-2013, 05:58 PM
13. ### Mann-Whitney test

Hi there, I am a total beginner with SPSS and I really need your advice, because I am carrying out my research. Is it possible to use Mann-Whitney...

• Replies: 0
• Views: 890
05-04-2013, 12:03 PM
14. ### Need Help With Calculation-(Inference About Two Means:Independent Samples)

Sample n1=14 n2=14 Size Same Mean x1(mean symbol)=7.881, x2=8.430 STD, s1=S1=1.017 s2=1.005 I am wondering where in my TI-84 SE I...

• Replies: 1
• Views: 1,316
PSG
05-03-2013, 06:48 PM
15. ### Best way to analyse my data: 2-way repeated measures anova?

:wave::wave: Hi TalkStats :wave::wave: I have a data set which is outlined in the table below: \begin{tabular}{|l|cr|} \hline ID & baseline...

• Replies: 1
• Views: 2,985
05-03-2013, 05:01 AM
16. ### Logistic Regression - How to interpret a Exp(b)= 0

Hi all, I'm working on a project and keep getting caught up with how to interpret my results. I've found lots of info on how to interpret...

• Replies: 32
• Views: 26,169
05-03-2013, 04:45 AM
17. ### what test to use instead of t test if the variable is not normally distributed???

Hi guys! I must compare one variable in 2 polupations.... which test should I do to check the normal distribution of the dependent variable...

• Replies: 1
• Views: 2,256
05-02-2013, 07:51 PM
18. ### série temporelle

Bonjour, Dans le cadre de ma formation je dois réaliser une étude statistique à partir d'une base de données (sur n'importe quel sujet) Je suis...

• Replies: 1
• Views: 25,245
05-02-2013, 04:04 PM
19. ### How can I find tendencies in specific cases between two groups?

So, I'm doing this project where we are investigating whether social networks can influence peoples distinctiveness. Briefly summarized, we have...

• Replies: 0
• Views: 836
05-02-2013, 08:14 AM
20. ### How do you derive autocorrelation for MA(1)

How do you show that \phi_{22} = \frac{-\theta^{2}}{1+\theta^{2} +\theta^{4}} given X_{t} = w_{t} - \theta w_{t-1}. I know that \phi_{11} =...

• Replies: 1
• Views: 1,192
05-02-2013, 08:07 AM
21. ### T-Test or Two-Way Repeated Measures ANOVA for significance?

My study consisted of faces being either flickered or static, and showing either anger or a neutral expression. I was wondering when finding...

• Replies: 0
• Views: 1,050
05-02-2013, 07:33 AM
22. ### Levene's test significant in two-way ANOVA

Hi everyone, I'll try and state my problem as clearly as possible and hope that someone will be kind enough to help: I want to run a two-way...

• Replies: 4
• Views: 5,579
05-02-2013, 06:51 AM
23. ### When is the distribution abnormal, judging from the mean, median and modus?

I have a poll data table with which be filled with between two and six thousand entries (one entry contains some 30 data). It is a table in SQL, a...

• Replies: 9
• Views: 2,486
05-02-2013, 05:30 AM
24. ### change of cale, rank correlation SPEARMAN

Hello everybody, I have computed a coeffecient correlation of SPEARMAN for 2 columns number; as you know, the result is between -1 and 1. My...

• Replies: 0
• Views: 1,012
05-02-2013, 03:05 AM
25. ### Equal Variances for ANOVA

Hello, In order to use ANOVA, the variances all need to be equal. The following are the variances I have for three samples: 1. Variance: 1.73...

• Replies: 3
• Views: 1,349
05-02-2013, 02:51 AM
26. ### Quantitative Statistics Help

Hey guys, so I have a stats project I have to do and I don't really know what topic to choose that would actually work. Here's the prompt ...

• Replies: 2
• Views: 1,558
05-01-2013, 11:35 PM
27. ### Drink A or B? Basic stats help.

What method do I use to solve this statistics problem? I have a sample of n=100 units(males and females)...50 male and 50 female. Each unit rated 2...

• Replies: 1
• Views: 1,420
05-01-2013, 11:32 PM
28. ### Dice Questions

Hi (this may belong to Probability but not sure), I want to know how many games do I have to play in order to get a 10 win streak? The game deals...

• Replies: 2
• Views: 1,389
05-01-2013, 02:31 PM
29. ### Getting individual results from overall results - Help plz

Hi people, I would like to ask for your help because I ran a psychophysical experiment with 15 persons but unfortunately I've collected in a wrong...

• Replies: 0
• Views: 978
05-01-2013, 09:28 AM
30. ### Comparing 2 sets of counts

Hi, I would like to compare 2 sets of counts. The data follow-ish a Poisson distribution and there are a lot of ties (lots of 0 especially). Would a...

• Replies: 0
• Views: 1,348
05-01-2013, 08:51 AM
31. ### Scheffe procedure for two-factor ANOVA

Hi- It's been a while since I've studied two-factor ANOVAs, and I'm afraid I'm a bit rusty. I have done a two-factor ANOVA, with the following...

• Replies: 0
• Views: 1,322
05-01-2013, 07:31 AM
32. ### SPSS Project

Need help deciding what test to run in SPSS. My question was this: "A school psychologist is interested in understanding some variables possibly...

• Replies: 0
• Views: 1,147
05-01-2013, 07:19 AM
33. ### statistics help needed! Any ideas with regards to answering these questions?

Question Three Plastic bottles containing a cleaning solution are packed in cartons of a dozen bottles. Let the random variable X be the number of...

• Replies: 3
• Views: 2,125
05-01-2013, 05:11 AM
34. ### Proportion Testing, which formula o use on TI-84

A researcher wishes to estimate the number of households with 2 computers. How large a sample is needed in order to be 98% confident that the sample...

• Replies: 0
• Views: 3,621
04-30-2013, 08:07 PM
35. ### Binary Logistic Regression - SPSS - logit plots for categorical predictors?

My initial question was how do I check for linearity in binary logistic regression when using categorical predictors. I've learned that I would use...

• Replies: 0
• Views: 1,813
04-30-2013, 06:47 PM
36. ### Testing a claim about a Mean. !Standard deviation "Not know"!

Before I write out my question I just want to say this is my first post ever on these forums, i'm Nemis nice to meet yall. I already know how to...

• Replies: 2
• Views: 3,469
04-30-2013, 04:45 PM
37. ### Need Help on Hypothesis testing

The question is: The health of employess is monitored by periodically weighing them in. A sample of 54 employees has a mean weight of 183.9...

• Replies: 1
• Views: 1,241
04-30-2013, 04:26 PM
38. ### Probability of multiple events with different chances

Heyas! I'm playing Fire Emblem: Awakening, and for funsies I'm trying to figure out the chance of X number of 'stat ups' per level up. Each level,...

• Replies: 3
• Views: 1,514
04-30-2013, 02:54 PM

my dissertation is in tomorrow and i really need to know which statistical test to run on my study. I will internet bank £15 to anyone who can...

• Replies: 14
• Views: 1,786
04-30-2013, 02:14 PM
40. ### Binary Logistic Regression - Hosmer-Lemeshow vs -2LL & nonsig predictors

Hi all, I'm hoping this community might be able to provide some help. I've tried searching the forums here, looking online, referencing my lecture...

• Replies: 5
• Views: 1,938
04-30-2013, 12:40 PM

if my test has two groups of people (7 in each) who each do an oppasite strethcing routine and are velocity testsed and then come back a week later...

• Replies: 1
• Views: 1,166
04-30-2013, 10:57 AM
42. ### Big ANCOVA/ANOVA Problems

I am going through all my data in my thesis and have spotted another huge (well i'm worrying myself that it is) problem. It involves a 2x2...

• Replies: 0
• Views: 1,141
04-30-2013, 10:32 AM
43. ### Statistics Headache - Any help gratefully appreciated!

Hi everyone, I have spent the good part of a week scouring the internet, trying to work this out and would be so grateful if someone could help...

• Replies: 7
• Views: 1,583
04-30-2013, 10:30 AM
44. ### What test to use for effect of personality on categorical data?

I want to find out the effect of personality (The big five - measured with a likert scale) on a yes/no decision, what test would I use for this? Can...

• Replies: 0
• Views: 932
04-30-2013, 09:49 AM
45. ### Is error rate data normally distributed?

Hi All, I have performed an experiment where I collect the number of 'typing errors' that has occurred. For instance, a user entered 51 different...

• Replies: 1
• Views: 1,430
04-30-2013, 09:44 AM
46. ### "Propagating" Degrees of Freedom

Good evening! -Background I'm a chemistry student who's received some elementary training in statistics. At the moment, I need to take...

• Replies: 2
• Views: 3,512
04-29-2013, 11:20 PM
47. ### (categorical data - small sample) Appropriate test(s)?

Greetings! I have a small sample (11 responses) of categorical data. I want to compare a binary response (near vs. far) to a nominal response...

• Replies: 0
• Views: 1,781
JLC
04-29-2013, 10:29 PM
48. ### Sum of stationary time series

Suppose X_{t} and Y_{t} are stationary time series with spectral densities f_{x}(v) and f_{y}(v) respectively. Show that Z_{t} = X_{t} + Y_{t} is...

• Replies: 5
• Views: 1,333
04-29-2013, 06:41 PM
49. ### Mean and Median for testing data distribution

Hi, I noticed that in the following articles data distribution is tested via checking for >10% difference in mean and median. ...

• Replies: 4
• Views: 2,516
04-29-2013, 04:33 PM
50. ### Independent Stationary TIme Series

Suppose z_{t} = x_{t}y_{t} where x_{t} and y_{t} are 0 mean, independent stationary time series. What is the autocovariance function of z_{t}? Show...

• Replies: 0
• Views: 1,140
04-29-2013, 04:24 PM
51. ### Cumulative relative frequencies

I have a problem I do not understand. I always end up with result 0.99 instead of 1. See lines 22 and 40: http://pastebin.com/hVcLbVAW Am I not...

• Replies: 0
• Views: 1,092
04-29-2013, 02:26 PM
52. ### Why beta signs of interactions do not rely on the dependent variable's coding?

I have a binary logistic regression model with some IVs (main variables and their interactions). I am playing with it to see if everything is OK, or...

• Replies: 2
• Views: 1,091
04-29-2013, 01:26 PM
53. ### What stats do I need to do for a clinical audit I have done?

Hello, sorry if I am a complete noob. Believe it or not i did further maths A Level including s1-4 (if you know what that means) but that was 10...

• Replies: 0
• Views: 1,368
04-29-2013, 01:25 PM
54. ### Experimental design

Hi, I have to design an experiment for a class, n i have to use statistical application. i am doing a research on a disease, n i have to find out...

• Replies: 1
• Views: 1,313
04-29-2013, 11:07 AM
55. ### Interpreting "Within-subjects contrasts" in Mixed ANOVA

Greeting stats peers, After conducting a 2x2x(3) Mixed Model ANOVA, I am struggling to understand the SPSS output "Within subjects contrast" ...

• Replies: 0
• Views: 2,812
04-29-2013, 06:05 AM
56. ### Mixed-effects model for a strongly unbalanced design

Hi all, I am somehow unsure on the best option to analyze these data. Here it is my study case: The response variable is a morphometric...

• Replies: 1
• Views: 1,505
04-29-2013, 05:30 AM

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