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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: 68,457
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: 200,178
07-16-2014, 11:01 AM

Can someone please help me with this problem? (1) You have taken two samples. The scores in the first sample are 1,5,9. The scores in the second...

• Replies: 0
• Views: 2,356
*N*
02-09-2008, 07:52 PM
2. ### How to convert a table of probabilities to j.p.d.f

Among the sudent that attempted the exams of Calculus III (CIII) and Differential Equation (DE) is oberved that the joint probability of passing or...

• Replies: 0
• Views: 2,629
04-19-2006, 05:08 PM
3. ### Working out RSS in matrix regression

Hey everyone Okay, I'm having a few problems. I'm fine with single variable matrix regression, using the formula \displaystyle RSS = \mathbf{e'e}...

• Replies: 0
• Views: 2,898
05-30-2010, 04:57 AM
4. ### Amchem's Tax Credit case study - stuck in a rut

Hello everyone, and first of all thank you for taking the time to read this. I am a student in a Management postgraduate program and during our...

• Replies: 1
• Views: 3,586
12-12-2012, 03:34 AM
5. ### ANCOVA Help

I am giving a pretest and then a posttest after using clickers. Should I use an ANCOVA? What would my covariate be? I am thinking it would be the...

• Replies: 0
• Views: 3,203
10-06-2009, 07:21 PM
6. ### 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: 2,559
04-13-2013, 06:07 PM
7. ### Is this correct?- Kriskal Wallis Test

I want to compare multiple groups pre-intervention and post-intervention, to see which intervention was the most effective. So I calculated the...

• Replies: 1
• Views: 1,367
04-10-2013, 09:19 PM
8. ### t-test

If you are given a matched groups design but the number of participants in the two groups are different, what do you do to calculate the standard...

• Replies: 0
• Views: 1,873
12-07-2007, 07:35 AM
9. ### Determining Sample size

Hello, I need help determining a sample size n for both a control and an experimental group. If I know the effect size, the alpha, and the...

• Replies: 0
• Views: 4,100
02-08-2008, 03:46 PM
10. ### T-Tests

I'm supposed to do a research project for my stats class and I'm so confused as to what my professor wants. We have to answer this sentence of...

• Replies: 1
• Views: 3,656
11-07-2008, 03:11 AM
11. ### Comparing two dependent sets of data based on their mean, SD and sample size

Hello First of all, my knowledge in statistics is very bad, I took a basic course in statistics many years ago but I don't remember much about it...

• Replies: 1
• Views: 2,008
11-14-2014, 03:51 PM
12. ### Inputting data with lots of variables/ which test to use?

Hi, Really hope someone can help. For my final year project i am looking at language development in twins v singletons and comparing their results...

• Replies: 7
• Views: 1,656
02-27-2014, 12:15 PM
13. ### Measuring relationship (correlation?) between continuous and categorical variables

Really struggling with this so really appreciate help. I want to measure the difference between language scores (scores between 1 and 300) and 6...

• Replies: 4
• Views: 2,643
03-16-2014, 04:22 PM
14. ### Multiple Linear Regression - really need help

Hi, I'm going out of my mind...really need help. I have one continuous dependent variable (test scores) and 6 categorical (with 2 categories -...

• Replies: 8
• Views: 2,418
04-08-2014, 11:01 PM
15. ### Help! Z is annoying!

Hi, I need help with understanding z. People always talk about z tests- but what does z actually mean? Is it the null? I've been given examples...

• Replies: 1
• Views: 2,322
12-15-2009, 09:36 AM
16. ### Help with basic definitions

What is the basic difference between Kaplan-Meier and Cox Regression? How do I say it in as few words as possible. I am really limited by word count....

• Replies: 4
• Views: 3,320
01-16-2011, 06:59 PM
17. ### How to type stats symbols in word

Hey guys, simple question, not directly related to statistics but I am trying to copy this Chi squared equation into word from a pdf but it won't let...

• Replies: 4
• Views: 11,523
02-14-2011, 06:00 PM
18. ### Which statistical test? I've shown my attempt to work it out.

2 Questionnaires (for hope and self-image) are given to participants before, during, and after an intervention. All participants take part in the...

• Replies: 3
• Views: 3,160
01-10-2017, 07:11 AM
19. ### Stats help

Hi all, I have a question: If I have five groups, overall significant one-way Anova, and I want to examine all pairwise tests, considering both...

• Replies: 1
• Views: 2,750
10-26-2006, 11:55 PM
20. ### Help!!!

I am stuck for 2 hrs! please help!! I have a 2 by 4 design: amount of eating (independent variable, out of 100) on stress (low vs high) and time...

• Replies: 0
• Views: 2,110
10-27-2006, 12:35 AM
21. ### Regression Help

Hi everyone, Can someone help me with this problem? Is it potentially problematic to collect data in small groups of 3-6 people? What is the...

• Replies: 0
• Views: 1,961
12-10-2006, 06:13 PM

Hi, I have a question: in a hierarchical regression when subsequent variables (X3 and X4) that are added later on results in the original variable...

• Replies: 1
• Views: 2,375
ssd
12-13-2006, 03:09 AM
23. ### equality of two samples

Hello, I have 10 values of two sample for each month for the 1987-1996 period. Is it possible to test if these two samples are equal? if so, which...

• Replies: 3
• Views: 2,822
01-19-2006, 10:21 PM
24. ### non normal distribution and regression

Hi, If the distribution of y variable is not normal. (skewness equal to 1.1 and kurtosis to 8.2) can i run a simple linear regression of the y on...

• Replies: 1
• Views: 8,752
04-18-2007, 11:20 AM
25. ### selecting regression variables

If there are a large number of variables and you want to select few of them to build a regression model without multicollinearity what are usually...

• Replies: 0
• Views: 2,150
11-05-2007, 03:46 PM
26. ### nb of variables in a regression

Hi, I have a small sample of 96 observations. I developed an empirical model with 4 independent variables to explain the independent variables and...

• Replies: 0
• Views: 2,146
02-07-2008, 05:54 AM
27. ### Correlation

I have 2 sets. I formed 5000 random groups of sizes ranging from 2 to 100 per group from the 1st set (sample size:4991)and then computed the average...

• Replies: 0
• Views: 2,873
11-16-2008, 04:24 AM
28. ### Factor analysis

If I run factor analysis, I can estimate the coefficients of the factors without knowing the factors. But I am puzzled about how to determine the...

• Replies: 1
• Views: 2,266
02-25-2009, 06:15 PM
29. ### Selection Bias

I am wondering if someone can recommend an easy to read textbook that talks about sample selection bias

• Replies: 0
• Views: 3,117
03-14-2009, 03:42 AM
30. ### Sampling

Assume I have a population A of 4000 people and Population B of 400. I want to select a sample from A and a sample of B can I choose randomly 100 of...

• Replies: 1
• Views: 2,982
04-15-2009, 05:16 PM
31. ### robustness check

I am running a regression of 5 independent variables: y=intercept + beta1*X1+ beta2*X2 + beta3*X3+ beta4*X4 +beta5*X5 Someone has questionnned...

• Replies: 0
• Views: 3,564
07-18-2009, 03:34 AM

You have two options to buy an item: Option A: mean = 25,000 standard deviation = 3,500 Option B: mean = 26,000 standard deviation = 4,500 ...

• Replies: 0
• Views: 2,695
04-17-2009, 11:16 PM
33. ### Regression analysis with non-integer event rates

I am working as part of a team on a relatively large dataset which has been subject to imputation analysis. One of my colleagues has pointed out...

• Replies: 13
• Views: 2,386
07-13-2015, 03:12 PM
34. ### Statistical dummy asks for help

Hi, I have no idea how to solve those questions. If there is anybody, who knows the answers, I'd really appreciate if you help me. 1....

• Replies: 0
• Views: 2,513
08-10-2012, 02:13 PM
35. ### Null and alternative hypotheses

I am stuck on this question - I was wondering if I have the answer correctly A revenue department is under orders to reduce the time small...

• Replies: 3
• Views: 5,501
04-09-2010, 02:02 AM
36. ### 99% confidence interval

I have worked on this problem for awhile trying it different ways - A random sample of 250 students at a university finds that these students take...

• Replies: 1
• Views: 9,068
04-13-2010, 10:30 AM
37. ### Discrete or Continuous?

on average, how many cigarettes do you smoke per day? is it discrete or continuous? the thing that trips me out is the "average". some are...

• Replies: 1
• Views: 4,800
10-02-2010, 02:37 PM
38. ### Help on distributions!!!

How would you best describe the population level data? Recall: Average dose of methotrexate for the GENERAL POPULATION OF ALL Lupus patients is 9.1...

• Replies: 1
• Views: 2,610
10-07-2010, 03:44 PM
39. ### Stats theory question!!!

hi, i really do not understand how to answer the following question, i've read my textbook and still cannot find any relevant information. What...

• Replies: 0
• Views: 2,069
02-06-2011, 02:11 PM
40. ### Type I error

Hi, im having some problems with this question, If there were more than J=2 groups and a t-test was used to compare the largest and smallest...

• Replies: 0
• Views: 1,647
02-06-2011, 02:24 PM
41. ### Quick Stats Question

What is the advantage of using multiple comparison techniques over multiple t-tests? thank you

• Replies: 0
• Views: 2,306
02-06-2011, 02:27 PM
42. ### statistics

if you have J=8, what is the maximum number of possible pairwise comparisons you can make?

• Replies: 3
• Views: 2,986
02-06-2011, 03:14 PM
43. ### Reduce Review of documents?

Hello, I would like some advice on reducing 100% paperwork review in particularly for Complaint files. I was considering using Binomial...

• Replies: 0
• Views: 1,341
12-06-2013, 05:44 AM

I have 2 data sets, one is my control, one experimental, and I have 4 distinct phenotypes resulting, which I'll call A, B, C and D. Control: A -...

• Replies: 4
• Views: 2,903
08-14-2008, 08:51 AM
45. ### First time I have ever been stumped

Hey there guys, I love stats and this is my third year of it in high school. I received these two questions from a friend of mine and no one can get...

• Replies: 2
• Views: 4,945
04-20-2009, 08:09 AM
46. ### Fisher Information

Hello. I have been told that Y is distributed as a binomial random variable with probability of success p and there are n trials. I have to find a...

• Replies: 0
• Views: 3,022
02-23-2014, 09:01 AM
47. ### Help The basic practive of statisitc 4th edition

Hello, I am looking for answers for the sample problems so that I can have a better understanding of Confidence Intervals and Signigicance...

• Replies: 0
• Views: 7,134
09-11-2007, 12:48 PM
48. ### How to sample a population?

If I were doing a study on a particular disease in a small city, how would I go about sampling the population? Would it be legal to stand outside a...

• Replies: 4
• Views: 3,180
12-13-2010, 08:35 PM
49. ### A bit confused on confidence intervals

Why does the t-value for the 98% confidence interval increase to 2.33 from 1.96? Basically what determines these values and what does it mean?

• Replies: 3
• Views: 1,850
10-15-2012, 03:19 PM
50. ### Sample size for ordinal logistic regression (or at least ordinal)

I am trying to determine the sample size I need for my dissertation and I have no clue where to begin. I have been unable to find a sample size...

• Replies: 1
• Views: 9,192
02-01-2014, 06:00 PM
51. ### I Need Help

All, I am struggling with Statistics in all areas. I'm great with numbers, however, I'm lost with this. Can someone help? Here are the following...

• Replies: 6
• Views: 10,644
11-03-2005, 12:41 PM
52. ### Help

My question is: Find the critical value Chi squared R corresponding to a sample size of 3 and a confidence level of 95 percent. I know that...

• Replies: 3
• Views: 9,707
11-04-2005, 05:25 PM
53. ### Help Again

If forgot, I had one more. I'm stuck on this equation too: A quadratic regression model is fit to a set of sample data consisting of 6 pairs of...

• Replies: 5
• Views: 3,548
11-19-2005, 10:56 PM
54. ### Help

I'm having a little trouble with the following question: Four pairs of data yield r = 0.942 and the regression equation (predicated value of y...

• Replies: 6
• Views: 8,340
11-19-2005, 10:10 PM
55. ### Dependent Sample Help

The question is asking the following: The two data sets are dependent. Find to the nearest tenth (one decimal place). A 64 53 57 63 51 B...

• Replies: 1
• Views: 4,911
11-24-2005, 10:43 AM

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