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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: 197,148
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: 66,943
09-30-2005, 09:44 AM
1. ### Confidence interval ratio of variances

Hi guys..I simply don't know where to start and my book isn't helpful at all (it doesn't mention this)....please help! A study was undertaken to...

• Replies: 12
• Views: 9,684
10-30-2008, 01:25 PM
2. ### Seeking feedback on a data visualization app

For the past year I've been assisting with the development of a data visualization application. It is in many ways experimental. My role is mostly in...

• Replies: 12
• Views: 4,442
11-01-2010, 12:42 AM
3. ### analysis for testing improvement size across 2 groups

I would love input regarding what analysis to use Design: IV: 1 between subjects group (sought assistance, no assistance sought) DV: ...

• Replies: 12
• Views: 4,185
06-17-2009, 10:29 AM
4. ### Hypothesis testing with multinomial distributions

If you throw a die and record the outcomes, you can test if the die is 'fair' with a chi-test. But how can you use the same data to determine with a...

• Replies: 12
• Views: 13,030
01-07-2010, 04:48 PM
5. ### Margin of Error - Confidence Level

I sent out a questionnaire to hundreds of people and recieved 154 responses. Some of the questions have a yes/no answer. So for one of them I...

• Replies: 12
• Views: 6,330
09-02-2010, 03:51 PM
6. ### More than just stat

I'm in my first stat class, and I am lost with the practice problems for the first test. They seem to have nothing to do with stat, but use algebra...

• Replies: 12
• Views: 5,600
09-15-2010, 01:06 PM
7. ### Estimate of travelling time

Hello! I'm a Norwegian engineer, now located in Tunisia. Everyday i take a sort of taxi, called collective taxi to my Arabic lessons in the neighbor...

• Replies: 12
• Views: 4,182
09-30-2010, 12:55 AM
8. ### Doubt on Experimental study

Hi I need to conduct an experimental study. The objective is to find the effectiveness of a particular teaching method on pupils. I carried out...

• Replies: 12
• Views: 2,865
01-24-2011, 09:42 AM
9. ### Stats noob needs help using SPSS! Compensation for ~1hour

Hi, I have collected some data on a study about income inequality, social mobility, and life satisfaction. My deadline is very very soon and I'm a...

• Replies: 12
• Views: 4,609
08-24-2011, 07:34 PM
10. ### Application of PCA component scores in regression model.

Hi, Is there anybody who is more or less "fluent" in principle component analysis? I'd need to use 20 categorical variables (2 or 5 or 7...

• Replies: 12
• Views: 7,211
09-15-2011, 06:16 AM
11. ### How can I do multi column sort?

Suppose I've a table with multiple columns like this for applicants for a job Applicant name || Degree in Computer || salary John ...

• Replies: 12
• Views: 4,025
09-17-2011, 02:35 AM
12. ### [SOLVED] Comparing beta weights

I'm comparing beta weights for 2 different models and I remember a formula that looks like this: for two groups: A = teacher B = student ...

• Replies: 12
• Views: 6,736
12-11-2011, 01:08 PM
13. ### Excel 2007 t-test

I am trying to do a t-test for two samples. The question asks me compare the mean salary of sample1 and sample2. I know how to do a t-test in excel...

• Replies: 12
• Views: 7,466
10-14-2011, 09:27 PM
14. ### Pearson's or Spearman's?

I've plotted a scatterplot of rock pool length against limpet frequency, and I have to look for a correlation. The data is fairly widely scattered,...

• Replies: 12
• Views: 12,596
02-01-2013, 02:23 PM
15. ### Using the distribution function method to obtain the of density 1-e^-x

Use the distribution function method to obtain the density of 1-e^-x when X has exponential distribution with Beta=1 This is the problem word for...

• Replies: 12
• Views: 2,668
BGM
12-16-2011, 12:30 PM
16. ### How to calculate P-value in this context?

A pupil can recite 30 words out of 100 wordlist (30%). After practice, he can recite 35 out of 110 wordlist (31%). If this is normal distribution, is...

• Replies: 12
• Views: 7,156
01-08-2012, 10:19 AM
17. ### Regression diagnostics with large sample sizes

I've started on the diagnostics with the help of the ucla website. My sample size is 1000. I ran 'proc insight data' as a first step and the...

• Replies: 12
• Views: 4,348
01-07-2012, 03:20 AM
18. ### Collapsing categories with SAS

I have a discrete variable: "NUMBER OF TIMES ..." It's frequency distribution is somewhat like this: 0 times=45 1 time=29 2 times=100 3...

• Replies: 12
• Views: 5,907
02-22-2012, 10:46 PM
19. ### Unusual Results - Please shed some light

I have a large number of regression outputs. In the main one IV, a moderator and the IV*mod. In about 8 regressions I am seeing a significant...

• Replies: 12
• Views: 3,459
03-28-2012, 08:45 AM
20. ### 4 unbalanced groups. Bonferroni/Tukey with proc glm okay to compare means?

The data is right skewed (all groups). Need to compare means. 3 groups have 300 observations each but the 4th group has only 100. Will a proc glm...

• Replies: 12
• Views: 4,297
03-31-2012, 04:37 PM
21. ### help with Homework

can anyone help me with this? I think I use a T-test? A study was conducted to explore the nature and prevalence of peer victimisation and...

• Replies: 12
• Views: 3,644
03-29-2012, 12:16 AM
22. ### t-test or mann-whitney

I have 2 sets of data. Hospital stay duration (days) for a particular illness. Hospital 1: 21, 10, 32, 60, 8, 44, 29, 5, 13, 26, 33 Hospital 2:...

• Replies: 12
• Views: 8,166
07-09-2012, 07:52 PM
23. ### One-way anova, but with 2 IVs

Hi everyone, I'm doing my thesis for Uni this year and have a question about anova! In a nutshell - I have 2 IVs with 2 levels each. The first...

• Replies: 12
• Views: 4,221
08-01-2012, 07:27 PM
24. ### Really stuck on what test!

Hi all! I have conducted Spearman rank test to find if there is a relationship between two variables, the two variables being perceived stress and...

• Replies: 12
• Views: 3,069
08-21-2012, 05:33 AM
25. ### Please Help - How Do I Prove Hypothesis?

Hi, I am in 6th grade, trying to do an analysis of data for a science fair project. Sorry, but I am only at Algebra 1, I do not have any...

• Replies: 12
• Views: 3,066
10-15-2012, 06:50 PM
26. ### chi square test for binary valued data

Hi all, I am trying to implement an algorithm using a programming environment. What I am asking is how can use chi square test for binary type...

• Replies: 12
• Views: 4,843
05-28-2013, 05:49 PM
27. ### What test to use?

Let's say you are testing the affect of two things, A and B, on study subjects. One group of subjects is assigned to A, and the other is assigned to...

• Replies: 12
• Views: 2,395
01-04-2013, 04:00 PM
28. ### Validating the measurement method used in a study

Hello all ! I'm doing my first study on my master degree level. I have designed a new measuring method. I should probably validate this...

• Replies: 12
• Views: 2,279
06-13-2013, 01:19 PM
29. ### standard error of measurement

Hello I am not a stats expert and I need you help with calculating the standard error of each sample within a collection. For example: Let's...

• Replies: 12
• Views: 2,485
06-10-2013, 12:51 AM
30. ### Probability from Mean and Standard Deviation - Please help?

I've been working on this question all day trying to get my head around it and I just can't. I kind of understand it but get confused halfway, on all...

• Replies: 12
• Views: 4,457
07-30-2013, 01:26 PM
31. ### Random Sampling Over time to make one random sample?

Hello everyone. I have an interesting question that was brought to me by a friend and I do not know the "correct" way to do it. Okay so basically,...

• Replies: 12
• Views: 2,915
08-30-2013, 12:42 PM
32. ### [help] jackknife estimater how do i calculate ?

how do we calculate jackknife estimater of v(x)= p(1-p) and show that it is unbiased i dont know steps of jackknife estimater calculater but i...

• Replies: 12
• Views: 2,633
BGM
11-27-2013, 12:41 AM
33. ### paired t-test or linear regression?

Hello, I am applying for an IRB to evaluate the effect of lidocaine (local anesthetic) dilution on pain and duration of intradermal anesthesia. ...

• Replies: 12
• Views: 3,015
03-19-2014, 06:45 AM
34. ### Very urgent help (not sure how to approach a one-tailed problem)

Hi guys, I am currently writing my thesis, and I am running out of time here. I keep getting stuck constantly in different parts of the thesis,...

• Replies: 12
• Views: 1,784
05-16-2014, 07:01 AM
35. ### Logistic Regression

Could someone explain the basics of logistic regression? Thank you!

• Replies: 12
• Views: 3,120
06-06-2014, 05:01 AM
36. ### significant p-value?

hello I am writing an essay, and I got an r value of 0.1018 at the data I am looking at. the sample size is 13 regions of a country. would this...

• Replies: 12
• Views: 3,315
06-14-2014, 02:13 AM
37. ### Mann-Whitney U Test: Ordinal data with few categories

Hello, I am trying to use the Mann-Whitney U Test to compare ordinal data between 2 groups, but the problem is that there are only 3 categories...

• Replies: 12
• Views: 3,838
07-02-2014, 10:03 PM
38. ### Correlation help

I have a report on correlation due soon and am looking for help as Math is not my forte. I am attempting to find the correlation between Marathon...

• Replies: 12
• Views: 2,591
07-12-2014, 09:50 PM

:confused: I recently began this much dreaded course. I am having a difficult time grasping the concepts. I have an exam on Monday September 26,...

• Replies: 11
• Views: 6,228
10-08-2005, 06:15 AM
40. ### Misapplication of Hypothesis Testing?

I was asked the following question and would like to hear your view: "In the year 2005 National exam, 57.4% of the students who sat for the...

• Replies: 11
• Views: 4,061
12-01-2005, 09:15 PM
41. ### Variance/Normal Distributions

I am currently in a psych tests and measurements class. I have a couple of questions that I can't figure out or find in the book. They are multiple...

• Replies: 11
• Views: 5,210
05-09-2007, 10:38 AM
42. ### Very very weird observation...

:confused: I have a group of data of size 15,000. The variance is 2.7950. I plot the histogram of them and it looks really quite Gaussian (Gaussian,...

• Replies: 11
• Views: 4,169
11-19-2007, 10:07 PM
43. ### z score

Is Z score something like, you convert some other types of distribution like J distribution, reversed J distribution to normal distribution ( with...

• Replies: 11
• Views: 6,664
03-01-2008, 02:05 PM
44. ### Need to calculate percentile score

I need help from one of you guru's. I have 8 statements that i ask, that are to be rated from 1 to 5 each. so, the lowest score is 8 and the highest...

• Replies: 11
• Views: 8,055
03-04-2008, 04:39 PM
45. ### Proving for Sums of Random Variables

hi, i was wondering if any1 could help me understand a few things on sums of random variables? If any1 could help me out with this question...

• Replies: 11
• Views: 3,730
05-08-2008, 11:04 PM
46. ### p-values from Monte-Carlo

I have data from two different groups and they both have 19 subjects. I find a statistical measure for the two groups and claim that one is greater...

• Replies: 11
• Views: 3,716
05-21-2008, 06:42 PM
47. ### Stat Problems Help (Homework)

1. A study in the journal of the American Medical Association examined people to see if they showed any signs of IRS (insulin resistance syndrome)...

• Replies: 11
• Views: 4,980
07-06-2008, 07:52 PM
48. ### Need help in excel with right tail??

Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead. Exceptions are...

• Replies: 11
• Views: 26,321
08-21-2008, 12:59 PM
49. ### just to get this straight

Hi, I have a column with several hundred percentage changes of stockprices. I was going to make a t-test to test if my expected value is...

• Replies: 11
• Views: 2,986
10-07-2008, 05:16 PM
50. ### What's between ANOVA and linear model

Hi everybody, I'm new around here, so if i do some mistakes regarding the threads etc. not to mention the statisitcal terms, sorry : ) I have a...

• Replies: 11
• Views: 8,033
10-15-2008, 07:30 PM
51. ### Help! How to interpret t-tests/t values?

Hello, I'm a journalist researching a story for a mental health publication. A number of studies I'm looking at give their results in terms of "t...

• Replies: 11
• Views: 133,448
10-31-2008, 09:28 AM
52. ### Where can I find U values

Hello, I need to find Wilcoxon-Wilcox table for critical values of U,for n1=15,n2=15, a=0.05 & a/2=0.025. I can use the values or where to find...

• Replies: 11
• Views: 3,973
10-29-2008, 09:32 PM
53. ### Ordered wieghted predictors: How to correlate them with observation?

Dear All, I am a physical chemist (not a statistician) so please forgive what can possibly be a naive question. If I have three ordered...

• Replies: 11
• Views: 3,023
02-01-2009, 02:06 AM
54. ### 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: 16,635
03-01-2009, 11:27 AM
55. ### Not sure what test to use in SPSS?

i have 4 IVs (wealth, health, social connectedness and love) and 1 DV but theyre all in numberical format. Does anyone know how to measure...

• Replies: 11
• Views: 8,206
04-27-2009, 05:32 AM
56. ### Normality

I'm not sure how to interpret the Shapiro-Wilk test correctly. Skewness and kurtosis suggest a normal distribution. A normal Q-Q plot suggests a...

• Replies: 11
• Views: 6,075
04-27-2009, 06:39 PM

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