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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: 196,833
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: 66,799
09-30-2005, 09:44 AM
1. ### Nominal, Ordinal, Ratio, Interval...? Need help.

I am having a really hard time with deciding whether things are nominal, ordinal, ratio, or interval. I was given four problems and asked to list...

• Replies: 2
• Views: 17,050
01-30-2006, 07:11 PM
2. ### ANOVA table, f ratio and mean squares

Hi, Here is my ANOVA table from a nested ANOVA, Treatment and year are fixed. ...

• Replies: 2
• Views: 17,026
07-30-2008, 03:36 AM
3. ### The weights of newborn children

Could someone please check my answer? The weights of newborn children in the United States vary according to the normal distribution with mean 7.5...

• Replies: 1
• Views: 17,016
01-16-2006, 10:01 AM
4. ### How to deal with bimodal distributions in SPSS?

I ran a psychology study in which kids watched 1 of 4 cartoons, and then performed 3 tasks. On one of the tasks, I obtained a bimodal distribution. I...

• Replies: 4
• Views: 17,016
07-28-2012, 05:12 PM
5. ### how to calculate the appropriate sample size

Dear teachers, I do appreciate if you can help me! I am a nursing student from Hong Kong, I need to design a study for my year end project. ...

• Replies: 4
• Views: 17,000
05-23-2008, 12:38 PM
6. ### factors vs covariates

What's the difference between a factor and a covariate?

• Replies: 1
• Views: 16,989
02-19-2010, 01:01 AM
7. ### Minimizing the sum of squared error for a regression equation?

I have two questions that I am hoping someone will be kind enough to help me out with. 1) Could someone please "translate" the following...

• Replies: 5
• Views: 16,988
10-07-2010, 11:40 PM
8. ### More than two values for a dummy variable (regression)?

How do I deal with the case where I am dealing with more than two values for a dummy variable when doing regression? I know that if there are 2...

• Replies: 11
• Views: 16,984
01-31-2012, 02:16 PM
9. ### Yes/No Questionnaire Analysis

Hey all. I'm having issues trying to figure out how to record and analyze some data I've collected. Here's the short story: 8 kids took before and...

• Replies: 9
• Views: 16,937
05-08-2012, 05:36 PM
10. ### Correlation between dichotomous and ordinal variables

Hi everyone, I am very thankful for your feedback on my eventually simple question: I want to calculate the correlation between a dichotomous...

• Replies: 8
• Views: 16,909
06-24-2011, 06:41 AM
11. ### Small sample size - an alternative to multiple regression analysis??

Hi all, I really hope someone can help me. I am investigating the relationship between school variables (7 factors) on teacher job satisfaction (3...

• Replies: 5
• Views: 16,866
10-13-2013, 10:56 AM
12. ### Sample Size Calculation

Hello guys, I am new to this forum, and I was asked by my boss at work to calculate a sample size. I have been out of statistics for several...

• Replies: 3
• Views: 16,845
09-30-2010, 09:29 AM
13. ### Confidence Interval: Adjusted Wald Method

If I am conducting an experiment on 10 people and all 10 performed a task successfully, I want to know how to determine the confidence interval. I...

• Replies: 4
• Views: 16,825
12-12-2006, 04:59 PM
14. ### Calculating intrasubject variability

I'm wondering which is the proper approach for an assessment of intrasubject variabilty. I have a series of patients of whom I have taken a...

• Replies: 6
• Views: 16,797
09-30-2008, 01:53 PM
15. ### P value/T distribution chart question

Thank you for taking the time to read my query. I appreciate it. For my class, we have to find the p values by hand. We look them up in the z, t...

• Replies: 8
• Views: 16,777
11-02-2010, 05:35 PM
16. ### Regression diagnostics with proc glm or proc reg

I fit my model using 'proc glm' but now it seems that proc reg should be used for the diagnostics. So, do I need to fit the model all over again...

• Replies: 28
• Views: 16,774
02-13-2012, 01:43 PM
17. ### dissertation help please...signal detection and d-prime alternative?

Hi! Ive just conducted my analysis for my dissertation and im worried i have done it completely wrong. this is the basic design: 2 stages; 1....

• Replies: 2
• Views: 16,743
04-08-2008, 08:42 AM
18. ### one sample t-test --> nonparametric equivalent?

Dear all, this is my first post in this forum, in which it seems many people find help and share insights :). Working on my MBA thesis, I might...

• Replies: 7
• Views: 16,706
12-19-2011, 06:13 PM
19. ### Percentile of SAMPLE mean

Can someone please explain to me how to work out the percentile of the sample mean (diff to confidence intervals which is pop mean) The Q is: ...

• Replies: 8
• Views: 16,704
09-20-2012, 04:52 AM
20. ### p value interpretation in Mann-Kendall test

Hi, I am performing a Mann-Kendall test on a set of a data. and I got a p value of 0.15 so it means the null hypothesis of NO TREND is not rejected....

• Replies: 5
• Views: 16,620
07-03-2013, 01:06 AM
21. ### Sample size calculation for pilot study

We are planning to do a study involving a new treatment that can reduce the size of the lesion by 20% on average but the range is expected to be...

• Replies: 3
• Views: 16,608
03-02-2010, 06:30 AM
22. ### library does not exist

Hi , I wrote a short code that create the library called test and creates the dataset account in it . But when I run it in SAS , I get ERROR...

• Replies: 2
• Views: 16,605
01-14-2010, 09:20 PM
23. ### Probability of getting 13 of the same suit

Hello! I'm trying to figure out how to calculate the odds of being dealt 13 cards of the same suit out of a standard 52 card deck. Example: Say...

• Replies: 11
• Views: 16,576
03-01-2009, 11:27 AM
24. ### Comparing mean of 3 samples

Hi I wonder if anybody would be so kind as to help me with a problem. I am a paediatrician looking at weight change after 12 months of treatment...

• Replies: 5
• Views: 16,554
09-16-2008, 03:13 AM
25. ### One-group pretest-posttest analysis?

Hello all, Experimental design: 8 subjects, each run through 6 identical trials in a pre-test. Measures were collected from each trial. Each...

• Replies: 1
• Views: 16,517
04-02-2010, 06:28 PM
26. ### Within-subject and between subject-variability

Dear experts and users: I was instructed to calculate the within-subject and between subject variability of a data set from one of my PIs. I would...

• Replies: 4
• Views: 16,511
07-03-2012, 01:13 PM
27. ### Help: Unbiasedness and Consistency

Hi all, Does unbiased estimator necessary means that the estimator is also consistent? Since expected value of unbiased estimator equals...

• Replies: 5
• Views: 16,397
12-15-2008, 02:30 PM
28. ### p-values - what is trend level?

I am using an alpha of .05 as to indicate significance. My advisor considers values over .1 as trend-level p-values. I understand that we can...

• Replies: 2
• Views: 16,327
01-17-2011, 01:53 AM
29. ### Warning message in Regression analysis

Hi there, I am working on my stats for my masters degree and am running a regression and receive the following message: "For models with your...

• Replies: 7
• Views: 16,265
01-10-2010, 11:26 AM
30. ### Meaning of basic stats abbreviations

I'm not a student, I'm a writer and I'm attempting to read some raw statistics and have no idea what the numbers mean. Could someone please put in...

• Replies: 5
• Views: 16,259
11-07-2007, 08:05 PM
31. ### Calculating alpha and power

A box contains 20 balls, some red and some black. We want to test the hypotheses: Null: there are exactly 4 red balls in the box. Alternative:...

• Replies: 14
• Views: 16,226
10-09-2011, 03:47 PM
32. ### G*Power Sample Size Calculation

Hi Everyone, First, let me say that I am thrilled to find this forum! It has been a while since I have taken Stats I and II, and I will be the...

• Replies: 15
• Views: 16,202
07-16-2012, 03:59 PM
33. ### probability of sample mean given population mean and SD

I'm doing a worksheet for homework in my statistics class and have the following question: The population mean annual salary for plumbers is...

• Replies: 3
• Views: 16,185
11-18-2010, 02:39 PM
34. ### Statistical analysis for likert type scale

Hey, please help! I am currently analysing data from a likert scale, descriptive stats not a problem, it is the inferential stats im having a problem...

• Replies: 6
• Views: 16,151
04-24-2006, 08:27 PM
35. ### XTLOGIT - interpreting odds ratio. Am I on the right track??????

I ran an xtlogit model on my panel data. Dependent variable: whether ppl adhere to the program or not (0 do not adhere 1 adhere) Independent...

• Replies: 14
• Views: 16,148
01-08-2012, 06:20 PM
36. ### How to test normal distribution

Hi all I have a set of data and want to test is it normal distributed or not? How can I do it? Thanks Daniel

• Replies: 5
• Views: 16,142
09-20-2007, 03:28 PM
37. ### Effect size for Wilcoxon Signed Rank

1) i want to calculate the effect size for wilcoxon signed rank (paired sample). I have one group of 10 participants. I know the formula for the...

• Replies: 10
• Views: 16,025
01-04-2013, 04:02 PM
38. ### Comparing sample with normative data

Problem: I will have survey results for a largish sample (n>300) and want to compare how different their scores are to established norms. The norms...

• Replies: 14
• Views: 15,971
07-17-2009, 04:10 AM
39. ### Coke vs. Pepsi Project Help

Hello everyone, I have been assigned a statistics project in which we were to conduct a hypothesis test and were asked to poll 50 people and record...

• Replies: 5
• Views: 15,840
10-12-2008, 01:31 AM
40. ### t-e test p value interpretation

Hi All *N.b. title should read t-test* 1st post, I need some help interpreting the results of a t-test. I understand that t-tests normally only...

• Replies: 2
• Views: 15,827
07-15-2008, 07:32 PM
41. ### Can someone explain the standardized residual formula for me?

For simple linear regression: (Yi-Yihat)/(s*sqrt(1-pii)) where p is the ith diagonal element of projection matrix P. Yi is the observed value,...

• Replies: 4
• Views: 15,827
12-04-2010, 09:37 PM
42. ### using ti 84 plus for standard normal distribution

Hi does anyone know how to find the probabily if the mean is 0 and the standard deviato is 1 , less than -1? what buttons on the ti 84 do i...

• Replies: 2
• Views: 15,823
06-20-2009, 11:57 PM
43. ### finding percentile

HI can someone help me set this up to solve. i know i had missed this on one my previous exam, and trying to study for tomorrow final exam. ...

• Replies: 4
• Views: 15,806
07-05-2009, 10:28 PM
44. ### Hypothesis Testing involving Poisson Distribution

Hi, Could anybody help me solving it? I am sure how to do a hypothesis test of Poisson distribution with small sample. A person will decide to...

• Replies: 3
• Views: 15,669
BGM
11-07-2009, 12:07 PM
45. ### Computing Z scores

I am doing homework and i can't seem to figure out the correct answer. Question: Men vs. Women The average 20 - 29 year old man is...

• Replies: 1
• Views: 15,624
02-26-2006, 06:07 PM
46. ### construct a confidence interval

Consumption of alcoholic beverages by young women of drinking age has been increasing in the United Kingdom, the United States, and Europe (The Wall...

• Replies: 2
• Views: 15,453
05-03-2011, 01:18 AM
47. ### P- Values, Critical Values, Test Value

I'm having major issues with these, can anyone point me in the right direction?? A recent study claims that business travelers spend an average of...

• Replies: 2
• Views: 15,447
11-06-2008, 10:38 PM
48. ### Power Analysis for Factorial ANOVA Design?

Hello, I have the following experimental design: Dependent Variable: time taken for task Independent Variables: task difficulty(2), device...

• Replies: 2
• Views: 15,425
06-30-2011, 12:32 PM
49. ### Higher order interaction in Four-way ANOVA

I have performed a four-way ANOVA ( four random independant variables and one dependant variable). On performing analysis, I founf out that four-way...

• Replies: 2
• Views: 15,386
08-31-2011, 01:08 PM
50. ### Mean Square Error in Excel

completely desperate...need to calculate the mean square error (MSE) for my master thesis (in order to run a standardized t-test) and somehow I just...

• Replies: 1
• Views: 15,355
11-11-2009, 09:26 AM
51. ### Standard Deviation of a Weighted Mean

Does anyone know how to calculate the standard deviation of a weighted mean? v p(v) 0 0.3 1 0.4 2 0.3 I need to calculate the...

• Replies: 6
• Views: 15,175
07-28-2008, 01:41 PM
52. ### adjusted residuals or standardized residuals?

Hi, I am performing chi-square analyses for my dissertation data and am wondering about appropriate "post-hoc" analyses when chi-square values are...

• Replies: 2
• Views: 15,104
06-27-2006, 03:58 PM
53. ### Shapiro-Wilk test for large samples

Hi all, does anyone know a routine with which to calculate the Shapiro-Wilk test statistic and corresponding p-values for sample sizes of >10000?...

• Replies: 7
• Views: 15,080
03-25-2010, 04:21 PM
54. ### what is quasibinomial distribution?

I've done some search, but still can't understand what quasibionmial distribution is. Can anyone give me an intuitive explanation? What is a...

• Replies: 3
• Views: 15,039
02-21-2017, 06:26 PM
55. ### Excel TTEST() vs Excel DataAnalysis\t-test

Hi, A while ago I had to compare an old and new punch tool using t-tests. I did the sums manually (as Excels DataAnalysis tool pack, which I...

• Replies: 5
• Views: 15,036
02-06-2008, 01:49 PM
56. ### Test of significance with discrete binary data

Hello all, I'm new to the forum. Please excuse me if the following question has been answered before. A search of the forum did not yield the...

• Replies: 5
• Views: 14,958
07-09-2012, 08:40 AM

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