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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: 196,988
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: 66,870
09-30-2005, 09:44 AM
1. ### SPSS: in regression test interaction between a continuous and a within subjects var

I have a SPSS analysis question regarding how to use regression to test for a moderator in a 2 x 2 design when the 2 x 2 design has both a between...

• Replies: 2
• Views: 11,642
09-22-2008, 04:13 PM
2. ### MANOVA: Can dependent variables correlate each other?

Hi, I have 2 groups of animals. An animal was tested in a cage. The cage was divided into 4 different locations. I scored the duration the animal...

• Replies: 4
• Views: 11,582
05-24-2011, 08:53 AM
3. ### Likert scale statistical analysis

Hi, I am doing research using a questionnaire which uses likert scale ratings. There are 8 different hypotheses and the questionnaire is set up so...

• Replies: 9
• Views: 11,565
04-07-2011, 10:04 AM
4. ### Why do degrees of freedom matter?

I work with Generalised Linear Models and we use use tests such as chi squared test and the AIC test to compare how good models are. These tests are...

• Replies: 6
• Views: 11,554
12-12-2013, 02:30 PM
5. ### Finding IRQ from standard deviation and normal distribution

Here's my problem. Any help or insight would be greatly appreciated: A report provided a standard deviation on waiting time to single room ...

• Replies: 3
• Views: 11,547
09-30-2011, 06:42 PM
6. ### Simplifying variance and standard deviation formulas

I am having a problem figuring how to simplify the std variation formula and variance formula. I need to figure what I would use in place of X, in a...

• Replies: 1
• Views: 11,529
06-28-2006, 04:52 PM
7. ### Prob Distribution plot in SPSS

Hi All I am quite surprised that I am not able to get the probability distribution plot in SPSS. I spent quite some time on google and other...

• Replies: 3
• Views: 11,529
01-25-2011, 10:26 PM
8. ### Multiple Regression negative p-values. Help Needed Please.

This is for a term paper for an undergraduate independent study course. I am using MS Excel 2007 and its Analysis Toolpack. I am performing...

• Replies: 3
• Views: 11,514
05-14-2012, 09:35 AM
9. ### Inference about a Population Proportion - Margin of Error and Sample Size

Last one :) Q: An automobile manufacturer would like to know what proportion of its customers are not satisfied with the service provided by...

• Replies: 3
• Views: 11,511
12-04-2005, 10:20 PM
10. ### Mann Whitney calculator

Hi, I'm having some problems useing Mann Whitney U test. I've used Win Pepi in the past but for some reason it won't calculate this problem for...

• Replies: 1
• Views: 11,508
06-30-2011, 11:43 AM
11. ### 2-Sample or Matched Pairs Test??

A group of forty male patients at a certain hospital were randomly chosen. This group is then randomly divided into two groups. Group A received...

• Replies: 3
• Views: 11,493
05-11-2011, 10:36 PM
12. ### HELP! - Statistical Significance Problem

The manufacturer of a daily dietary supplement claims that its product will help people lose weight. The company obtains a random sample of 950 adult...

• Replies: 8
• Views: 11,492
p05
07-16-2010, 12:32 PM
13. ### MLE of 1/theta

I'm stuck on the third part of this question, I think I know how to find the maximum likelihood estimate of theta, but I don't really know what it...

• Replies: 4
• Views: 11,483
05-19-2009, 10:30 PM
14. ### Statistics 350 Final Studying Help!

I'm trying to study for my stat 350 final that is tomorrow, i'm getting through the stuff but have ran into a problem that I hardly know where to...

• Replies: 3
• Views: 11,481
05-15-2009, 02:44 PM
15. ### Cronbach Alpha reliability

I computed cronbach alpha reliability for 14 items 52 cases. it is -1.71!!! The SPSS says: "The value is negative due to a negative average...

• Replies: 1
• Views: 11,479
02-27-2011, 07:17 PM
16. ### Transformation then Standardization...?

Hi, I was wondering if anyone could answer what is probably quite an obvious question... I've got a dataset with 9 variables, of which I am...

• Replies: 3
• Views: 11,463
12-18-2005, 12:10 PM
17. ### class width

What is the class width of the fourth class? Im a little lost. Is it the difference between two consecutive lower class limit? Im not sure because...

• Replies: 1
• Views: 11,455
06-19-2010, 09:38 PM
18. ### Finding Standard Deviation

Hello everyone. I am new here, so excuse me if I sound a little too noobish. I am currently faced with the current problem on my homework. It isn't...

• Replies: 23
• Views: 11,452
BGM
12-06-2011, 02:48 AM
19. ### Find the P-Value. Use it to test the claim.

For healthy adults, the mean pH of arterial blood plasma is 7.4. Assume that pH for blood plasma is normally distributed. A new arthritis drug is...

• Replies: 3
• Views: 11,442
04-10-2011, 09:24 PM
20. ### weighted least squares confidence interval

Hi there, I am new and hoping to use the site right and you get to see my first question! I am interested in constructing a 95% confidence...

• Replies: 2
• Views: 11,437
08-25-2008, 12:50 PM
21. ### Demographic Data Comparison

I am trying to find a statistical test to determine the difference between two samples of demographic data. Here's a simple example: Sample 1:...

• Replies: 1
• Views: 11,421
09-09-2009, 10:43 PM
22. ### Need help ! Maximum Likelihood Estimator

Anyone please help me understand this question i`ve been trying it since the last 3 hours... please guide me through it solution... Q. Let X...

• Replies: 4
• Views: 11,416
05-02-2008, 09:31 AM
23. ### Pre-post test comparison on Likert data

I have Likert scale data based on students' self-rating on several course related skills. They rated themselves at the beginning of the course and...

• Replies: 2
• Views: 11,414
05-05-2010, 02:22 PM
24. ### Correlational design using nominal/ordinal data

I have a problem that I've been struggling with for some time now. I can't find a standard, non-parametric test that seems to deal with this type of...

• Replies: 27
• Views: 11,395
02-03-2012, 08:30 AM
25. ### Is the distribution of chi-square values is normally distributed?

Is the distribution of chi-square values is normally distributed?

• Replies: 2
• Views: 11,380
07-26-2010, 10:35 AM
26. ### How to Convert from Nominal to Interval

Hi all... Please guide me...how i can convert nominal scale to interval scale. TQ

• Replies: 6
• Views: 11,371
12-25-2011, 11:08 AM
27. ### ANCOVA violating homoscedasticity

I've come across a problem in ANCOVA that I can't seem to figure out. I have a sample size of over 600 people. I've got a 2 (male vs female) x 3...

• Replies: 14
• Views: 11,351
02-20-2011, 11:56 AM
28. ### how use SPSS for calculate dunn test??

hi. I need to calculate "dunn test" for my data with SPSS software. can ou help me??

• Replies: 1
• Views: 11,327
04-26-2013, 12:28 PM
29. ### Benford's Law: Z-score Formula

In an archived edition of Journal of Accountancy, an article was published on Benford's Law that included an Excel spread that determines Benford...

• Replies: 1
• Views: 11,325
11-05-2007, 04:24 AM
30. ### [SOLVED] Time Series vs Repeated Measures

I'm trying to dabbling in HLM/Multi level models a bit. I come across the terms Time Series Design and Repeated Measures Design frequently. ...

• Replies: 3
• Views: 11,320
01-17-2012, 05:32 PM
31. ### Interpreting chi square results

Would appreciate help interpreting this contingency table and chi square results (not real data, just for illustration purposes). Trying to see if...

• Replies: 7
• Views: 11,301
12-19-2009, 10:33 AM
32. ### t-test vs ANOVA

I have received 200 replies to my questionnaire. Based on the responses, I have 80 repsonses from companies based in Australia, whereas the rest are...

• Replies: 4
• Views: 11,262
05-02-2009, 10:42 PM
33. ### Power, effect size, sample size explanation

Would someone please explain or provide a link to an explanation for the following quote: When planning a study, practicing researchers specify an...

• Replies: 3
• Views: 11,212
12-13-2010, 03:58 PM
34. ### definition of deviance

Hi, I have a problem with definition of deviance. In my case I need this for a logistic regression. In Wikipedia or Dobson (A introduction to...

• Replies: 1
• Views: 11,204
02-11-2009, 05:33 PM
35. ### Fisher's Z Transformation

The correlation coefficient between end-systolic volume and end-diastolic volume for the 11 male patients was found to be 0.9666. Using Fisher's Z...

• Replies: 3
• Views: 11,186
05-20-2009, 08:54 PM
36. ### When to assume Normality

I am working with a rather large sample (approximately 120). Typically, I would not have any issues justifying normality due to the large sample size...

• Replies: 10
• Views: 11,177
10-15-2011, 07:43 PM
37. ### comparing skewness of two distributions

I have two (sample) distributions, and I need to test if the skewness of the two distributions is different from each other. Is there a standard...

• Replies: 4
• Views: 11,173
06-20-2012, 02:57 PM
38. ### 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: 11,160
02-14-2011, 06:00 PM
39. ### A Soldier in Combat need help with Discussion (Monty Hall)

Can anyone please tell me in Statistics with the following A number of years ago, there was a popular television game show called "Let's Make a...

• Replies: 19
• Views: 11,135
03-21-2011, 03:26 PM
40. ### help please!

Scores this year on the SAT Mathematics test (SAT-M) for students taking the test for the first time are believed to be normally distributed with...

• Replies: 2
• Views: 11,095
06-29-2010, 10:56 AM
41. ### When to use Fisher's exact test

I am working on some statistical issues for work, and have encountered resistance to use of the Fisher's exact test in some cases. They are saying...

• Replies: 1
• Views: 11,082
07-25-2008, 01:09 AM
42. ### When to assume equal/unequal variances?

When doing a t-test between two samples, when should I assume their variances are equal and when should I assume they are unequal? Here's my...

• Replies: 2
• Views: 11,079
12-17-2009, 03:01 AM
43. ### Simple Random Sample vs Random Sample

Problem: "A computer company employs 100 software engineers and 100 hardware engineers. The personnel manager randomly selects 20 of the software...

• Replies: 6
• Views: 11,069
06-26-2012, 04:33 PM
44. ### Need some helps with my homework please...

first i want to say hi, my name is jose, and what a cool lil site you guys got here!!! im having some issues with my stats hw, there are like 12...

• Replies: 2
• Views: 11,064
05-02-2008, 06:28 AM
45. ### Moment Generating Function help

Can anyone help me with this problem? If Y has a binomial distribution with n trials and probability of success p, show that the moment-generating...

• Replies: 2
• Views: 11,056
10-06-2010, 12:46 PM
46. ### About weighted kappa!

Hi I want to measure the intra-examiner agreement (reliability) for ordinal data using weighted kappa I used MedCalc and it gave me 2...

• Replies: 4
• Views: 11,054
01-03-2010, 01:02 AM
47. ### standard error of ratio of coefficients

hi all, I am interested in the ratio of two regression coefficients. Is it possible to obtain a standard error for such a ratio? eg: I...

• Replies: 2
• Views: 11,045
02-05-2007, 12:48 AM
48. ### Linear vs. Quadratic in Comparisons - Why?

Hello, I have a set of data for the level of antioxidants in tea, with two variables (water temperature of either 70 or 90 degrees, and steeping...

• Replies: 2
• Views: 11,043
01-29-2007, 09:16 PM
49. ### Ti-83 for Anova & Tukey Tests

I found a ti-83 program written by James D. Jones at <http://people.richland.edu/james/ti82/download.html> that does ANOVA test and then Tukey-Kramer...

• Replies: 2
• Views: 11,017
10-23-2010, 08:35 PM
50. ### transforming negatively skewed data then running tests

Hello! I want to do a paired t-test on some data. 1 of my pair isn't normally distributed and has a negative skew. I reverse scored it then ran a...

• Replies: 2
• Views: 11,008
04-07-2009, 06:23 AM
51. ### Categorical and ordinal scale....chi square?

Hi I am seeking help on this issue. I have a categorical variable namely gender (male x female) and an ordinal variable about perception of a...

• Replies: 18
• Views: 11,001
08-24-2012, 01:28 PM
52. ### Confidence Interval Problems (unknown S.D.)

Problem 1: {Exercise 8.17} The International Air Transport Association surveys business travelers to develop quality ratings for transatlantic...

• Replies: 0
• Views: 10,987
11-21-2007, 08:11 PM
53. ### Hypothesis

Question:Identify the null hypothesis, alternative hypothesis, test statistic, P-value, conclusion about the null hypothesis, and final conclusion...

• Replies: 1
• Views: 10,984
10-28-2007, 05:26 PM

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