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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: 196,561
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: 66,620
09-30-2005, 09:44 AM
1. Correlation for regression- help needed please

Hi everyone, Firstly, let me apologise for how rubbish I am at stats! I need to do a multiple regression and I've been told I need to do...

• Replies: 0
• Views: 1,136
04-18-2013, 04:36 PM
2. degrees of freedom R t-test

I've carried out this t-test with toy data in R: set.seed(45) x <- sample(10:100, 20) set.seed(45) y <- sample(50:150, 20) t.test(x, y)

• Replies: 3
• Views: 5,512
04-18-2013, 02:57 PM
3. confidence intervals in R

I've drawn 100 samples of size 25 from the mpg variable in mtcars and calculated 95% confidence intervals for the means of each of these samples. ...

• Replies: 1
• Views: 1,587
04-18-2013, 02:56 PM
4. Missing Data

I am very new to statistics but I am looking for some common practice regarding this subject. I have entities which have an arrival time, but in...

• Replies: 15
• Views: 3,128
04-18-2013, 11:36 AM
5. Quantify mediation effect of one variable on interaction of 3 others

I would like some quantitative measure of the degree to which an observed categorical variable predicts mediates the effect of an experimentally...

• Replies: 0
• Views: 1,165
04-18-2013, 09:07 AM
6. tests of normality

Hi. How can I test normality of data? Which is the best tests?

• Replies: 23
• Views: 4,561
04-18-2013, 02:40 AM
7. Regression Question

Hey guys, stuck on a homework question, help please! Country/per capita expenditure/% of Health costs paid by private insurance Japan/2662/0.4...

• Replies: 11
• Views: 1,731
04-18-2013, 01:18 AM
8. AR(1) model help

AR1 model how to do it,

• Replies: 0
• Views: 1,254
04-17-2013, 07:34 PM

This is mostly on the Hypothesis TEsts for a Mean Population= Population STD is Known. I know the formula just fine, but this deals more with the...

• Replies: 1
• Views: 1,168
PSG
04-17-2013, 07:29 PM
10. Fair value model

Hi all, I am trying to build a fair value model for a currency pair. The idea is to look at a pair - for example the Euro against the Czech Korona...

• Replies: 0
• Views: 1,273
04-17-2013, 10:18 AM
11. (nested) mixed model in SPSS

Hi My question concerns both data structure (and subsequent the exact analysis model to use) and the implementation in the statistical software...

• Replies: 0
• Views: 3,358
m.v
04-17-2013, 08:45 AM
12. Results Interpretation

Hi, Been a while since I've had to do statistics, would appreciate any help! Basically I've completed the SPSS tests (Oneway ANOVA), but now have...

• Replies: 2
• Views: 1,542
04-17-2013, 04:37 AM
13. Bayes' Parameter Estimate

Hello everyone, For this problem, I calculated the Bayes' estimate of the parameter, p , both by recognizing it and by calculating it using the...

• Replies: 3
• Views: 1,059
04-16-2013, 10:22 PM
14. Which test should I run in SPSS for my data

Hi there, I would be very appreciative of anyone that can help me with my dilemma. I am currently a grad student that just finished running data for...

• Replies: 0
• Views: 1,077
04-16-2013, 07:24 PM
15. Is given data sample or population

What is the logic in determining whether a given data is sample or population. E.g. I have a bunch of stock returns from 2009 to 2011. There is no...

• Replies: 2
• Views: 1,344
04-16-2013, 06:48 PM
16. maximum likelihood

Hello! I would like to know if what I need to do is feasible. Given a sample x=, I would like to know the probability (the likelihood) that the...

• Replies: 7
• Views: 1,869
04-16-2013, 06:13 PM
17. Standard Deviation Help

ABC Airlines' planes hold 100 passengers. They book 120 passengers. 20% of the people that they book do not show up. What is the percentage that on...

• Replies: 4
• Views: 1,577
04-16-2013, 12:00 PM
18. Finding Confidence level if given confidence interval?

Here is the problem... Suppose a random sample of size 81 from a normal population with known standard deviation = 40 produced (60,80) as a...

• Replies: 2
• Views: 1,896
04-16-2013, 11:11 AM
19. SPSS - Independent t-test (Desperate for help!)

I am currently trying to complete my results section for my dissertation, I am looking at gender differences in attitudes towards domestic abuse. I...

• Replies: 3
• Views: 1,493
04-16-2013, 08:11 AM
20. Trouble with Confidence Intervals

Hey all, I feel like this is a very basic question, but I want to make sure I get it right. Here is my problem: I need to get a confidence...

• Replies: 1
• Views: 1,209
04-16-2013, 07:08 AM
21. Combining expected values and variances

Hi! First post here so cut me a bit of slack :) Hopefully an easy topic too (I'm new to stats). If I have some values for E(X) (e.g. 5min) and...

• Replies: 0
• Views: 2,694
04-16-2013, 07:04 AM
22. Comparison of data distribution/normality in multiple groups

I would appreciate some assistance with data distribution. I am looking at a pre-intervention measure (discrete continuous) from a large...

• Replies: 0
• Views: 1,217
04-16-2013, 06:37 AM
23. Bonferroni Test for 2 Models in Prism

Hi, I have 3 diabetic animal groups; and 3 non-diabetic groups. If I want to run Bonferroni Test, for selected pairs for these 2 models (diabetic...

• Replies: 0
• Views: 1,359
04-16-2013, 05:32 AM

i have to do some stats for my project at uni and im struggling and stressing smooth newts and great crested newts at 8 ponds data sets of...

• Replies: 3
• Views: 1,547
04-15-2013, 04:20 PM
25. Expectation of function of a random variable

Hi guys, I hope everyone's been doing well. Sorry I haven't been around lately. School's just kicking my butt bad. I'm hoping that someone can...

• Replies: 3
• Views: 1,341
04-15-2013, 03:31 PM
26. Standard Deviation

A gambler has rolled five fair dice 40 times and computed the average score each time. Here are the 40 average scores the gambler computed: 4.6,...

• Replies: 3
• Views: 2,007
04-15-2013, 01:50 PM
27. auto correlation plot- tool

Hi all, Does any one know any tool or any sample in excel for partial autocorrelation plot. here is the sample of partial autocorrelation...

• Replies: 0
• Views: 1,430
04-15-2013, 01:24 PM
28. Multiple Regression: Standard Error of estimate

Hello everyone, I'm a student and I was looking through some statistics questions and I found something strange that I couldn't explain at all. ...

• Replies: 3
• Views: 2,340
04-15-2013, 12:29 PM
29. Unequal sample sizes?

Hi, what do you have to consider when using unequal sample sizes? How does it differ from using equal sizes? As an example, I have Group 1:...

• Replies: 9
• Views: 4,828
04-15-2013, 10:38 AM
30. Statistics Coursework Bayes

We have been given this coursework and told that its harder than any exam question we will ever get. I have no clue on how to do this? I'm guessing i...

• Replies: 5
• Views: 1,996
04-15-2013, 08:48 AM
31. Help with ANOVAS

1234567891

• Replies: 1
• Views: 1,421
04-15-2013, 07:21 AM
32. Uniformly Most Powerful Test

Hello, Let X be a single observation from f(x)=\frac{\theta}{2^{\theta}}x^{\theta-1},\ \text{for}\ 0\leq x\leq 2 Find the most powerful...

• Replies: 3
• Views: 1,349
04-15-2013, 05:01 AM
33. size sample required to construct a 95% C.I. with margin of error

N = 8 Mean = 2.10 stDev = 0.537 What size sample is required to construct a 95% confidence interval with a margin of error of 0.3? try n = 12,...

• Replies: 0
• Views: 605
04-14-2013, 11:04 PM
34. Unsure on how to plot data..

We are doing an experiment in our lab, and it's fairly simple: we take five randomly selected rubberbands, and shoot each of them the same five...

• Replies: 0
• Views: 1,016
04-14-2013, 07:42 PM
35. On covariance of ordinary differential equations and their arguments

Hi, Consider the time-varying, ordinary differential equation : \dot x = f(x,t) (1.) Next, suppose the observed...

• Replies: 0
• Views: 1,268
04-14-2013, 09:00 AM
36. Can i do a t-test after Tukey post hoc?

Hello just wondering if this is acceptable or whether it's just gonna cause a type-1 error. I have used One-way ANOVA and then Tukey post hoc to...

• Replies: 8
• Views: 2,803
04-14-2013, 06:33 AM
37. A binomial toughie

Hi guys, could someone people help me with this hard problem? I read fundamentals of biostatistics by posner (revelant sections), did some google...

• Replies: 0
• Views: 976
04-14-2013, 02:12 AM
38. Assuming Equal Variances- what to do?

Hello, On my data I have assessed whether it's parametric. The distribution is normal, however on the Levene Statistic test, it has a significance...

• Replies: 1
• Views: 2,361
04-13-2013, 06:07 PM
39. Levene test significant in GLM mltivariate

Hi everyone! I have found statistical significance for one variable in a General Linear Model multivariate test. For this variable the Levene test...

• Replies: 0
• Views: 1,776
04-13-2013, 12:01 PM
40. One Sample Wilcoxon Signed Rank Test

I have two measures from the same large sample of people (N>1,000). I want to test the hypothesis that one of the measures will be greater than the...

• Replies: 1
• Views: 3,030
04-13-2013, 09:19 AM
41. HLM simple slope analysis

Would you please let me know if I need simple slope analysis for this HLM output? Thanks~ Final estimation of fixed effects ...

• Replies: 0
• Views: 2,508
04-12-2013, 06:22 PM
42. Is Gross profit and budget (in US millions of dollars) discrete or continuous?

Please help I'm so confused atm I've done a bivariate analysis on the relationship between the Budget and Gross Profit of movies NOTE: some of the...

• Replies: 0
• Views: 3,356
b2g
04-12-2013, 05:57 PM
43. Disseration non normal data help

Hi I am struggling to work out how to interpret my dissertation data and not sure what tests/how to perform the tests on SPSS. My study looked at...

• Replies: 3
• Views: 1,680
04-12-2013, 04:53 PM
44. Indirect Moderation: Is it possible? Has it been done? Am I taking crazy pills?

Greetings! I'm trying to work out a method for testing the moderating effects that might be carried (mediated?) by an additional moderating...

• Replies: 3
• Views: 1,102
04-12-2013, 08:58 AM
45. help for final dissertation in finance- very easy stat - URGENT! :-)

Hi I am about finishing my thesis in finance but I don't remember anything about statistics and I need your help!! here is my issue: the topic...

• Replies: 2
• Views: 1,032
04-12-2013, 07:43 AM
46. Brief question about chi-square test for trend

Hey folks, I have three different time points (1y, 2y and 3y) and I'm going to see whether certain proportion changes over time. The proportions...

• Replies: 0
• Views: 2,109
Jka
04-12-2013, 07:27 AM
47. Comparing two sets of Likert-scale data

I have used a questionnaire which contain 5 point Likert-scale questions. What statistical test can I use to find out if there is a difference...

• Replies: 1
• Views: 3,459
04-12-2013, 03:41 AM
48. sample size formula

Hi, I have a sample size calculator problem: I have to draw a random sample of Toyota car owners from a city; I know the size of the population...

• Replies: 0
• Views: 1,269
svs
04-11-2013, 11:49 PM
49. Statistical technique to compare more than one groups with given constant values

Hi! I have three samples (S1, S2, S3) to test for nitrogen content and three methods of analysis (M1, M2, M3). I am trying to find out the most...

• Replies: 1
• Views: 1,313
04-11-2013, 11:14 PM
50. Unusual data points help

Hi there. I'm a student doing a i'm doing a bivariate analysis of the relationship between budget (explanatory variable) and gross profit (response...

• Replies: 0
• Views: 991
b2g
04-11-2013, 08:56 PM
51. Standard Deviation of X Bar?

The population standard deviation= 1.7078 n=40 What is the standard deviation of x bar? Help! I keep using the formula: standard deviation of...

• Replies: 8
• Views: 5,320
04-11-2013, 08:19 PM
52. tests of equivalence help

Hi all I'm looking for some advice on the following equivalence question-- I've been trying to think it through systematically but I'm confused! ...

• Replies: 1
• Views: 1,167
04-11-2013, 01:42 PM
53. Multinomial regression?

Hi all, I need an advice on how proceed with my data analysis. I have 4 groups of treatment (included the control and three concentrations of a...

• Replies: 0
• Views: 1,076
04-11-2013, 01:20 PM
54. Are there residual plots for Poisson Regression?

Does one assess the normality of residuals via residual plots?

• Replies: 2
• Views: 1,674
04-11-2013, 12:46 PM
55. Statistical test for pre-post multiple choice questions

Hi! So I have a pre-test, a lecture, and then a post test. The data is paired. I have 3 different question types: Multiple-choice (where...

• Replies: 3
• Views: 2,289
04-11-2013, 11:53 AM

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