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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: 197,205
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: 66,982
09-30-2005, 09:44 AM
1. ### best test to determine if two proportions are different

Dear all, Let me first state my problem. I am analyzing a genome and its genes. I can calculate proportions of different types of genes in the...

• Replies: 21
• Views: 5,289
08-28-2012, 10:00 PM
2. ### Doing a stats assignment with R. Would love some advice on what stats tests to run

We've been given data for 9 different genomes of fruitfly. These have then been split into 3 groups based on their overall effect on the fly's...

• Replies: 21
• Views: 3,339
Cam
11-24-2012, 12:22 PM
3. ### Pool data and compare data for my systematic review

Hello everybody, I am new to this website and to statistics as well. Currently I am writing a systematic review on complications and reoperations...

• Replies: 21
• Views: 5,706
02-10-2017, 11:21 AM
4. ### Would this Likert scale count as interval?

Hi everyone. A simple question please. I have been reading that there is a huge debate on whether nominal Likert scales (agree, disagree) can be used...

• Replies: 20
• Views: 7,389
07-03-2011, 11:17 PM
5. ### Norms and standardization

As a starter, my question is very simple. How to apply norms and standardize a test. I have two tools - One with 120 items and another with...

• Replies: 20
• Views: 9,165
11-08-2010, 08:19 AM
6. ### P-value when one data set has all zero values

Hi Forum :) I am currently comparing data sets of insects caught in pitfall traps from two sites with Mann-Whitney tests. There are 20 samples in...

• Replies: 20
• Views: 9,584
11-15-2011, 11:37 PM
7. ### How do I prove something is a variance matrix?

I'm not sure about this but if i recall correctly there was a property of matricies to show a matrix was a variance matrix. Was it that every...

• Replies: 20
• Views: 5,275
03-06-2012, 09:54 PM
8. ### Odds ratio calculation

Hey guys. I've been doing some work during the holidays and there's one thing I've been having trouble with. I'm doing a personal study...

• Replies: 20
• Views: 5,778
08-12-2012, 06:10 PM
9. ### help me...

I am a researcher in data mining and I am master student in Engineering Computer. I have one problem in my research. my thesis topic is "mining in...

• Replies: 20
• Views: 3,024
10-05-2012, 12:33 PM
10. ### building confidence interval for a simulated estimate

Hi, the context : I'm using a basic logistic regression model on my data, and the values of interest are the basic estimates : Beta regression...

• Replies: 20
• Views: 3,954
06-06-2013, 10:46 AM
11. ### Chi square test of independence - test of difference or association?

Hi everyone, I understand chi square tests of independence, and have read the FAQ on chi square tests. What confuses me somewhat is the use of chi...

• Replies: 20
• Views: 3,925
07-05-2016, 01:42 AM
12. ### 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: 11,159
03-21-2011, 03:26 PM
13. ### math to compute width of gaussian PDF(x) given sigma & N values of random variable x

Hi Experts, I'm working in industry and have an application requiring some expert knowledge on statistics/probability. I have a probability...

• Replies: 19
• Views: 5,247
06-17-2011, 08:06 PM
14. ### How many combinations?

Hi all - I wonder if this might be the place to to find an answer to this question. I am trying to work out whether a key-safe I am thinking of...

• Replies: 19
• Views: 7,754
08-06-2011, 10:32 AM
15. ### Outlier analysis

I am going to carry out an outlier analysis. Specifically on the number of hits on a given case per user. I need to answer several questions I have...

• Replies: 19
• Views: 5,211
10-18-2011, 11:48 AM
16. ### Transform data to use ANOVA?

Hey, I have a set of non-normal data that I need to run an ANOVA on. Do you think I would get away with transforming the data to do it, since one...

• Replies: 19
• Views: 21,816
11-23-2011, 05:48 PM
17. ### Analysis of Entomological Findings Help

Solved....

• Replies: 19
• Views: 4,134
02-03-2012, 05:13 PM
18. ### What is the role of the test statistic? [I'm not talking about the p-value]

For example when Shapiro-Wilk test shows the statistic .945, df=12, p-value=.563 I know it's 'not significant' and I retain the H0 hypothesis, but I...

• Replies: 19
• Views: 5,425
07-18-2012, 01:22 PM
19. ### Univariate, Bivariate, Multivariate: Myths and facts

This is not a question but a summarization of my recent learnings regarding the common mistakes in calling different types of analyses, and to...

• Replies: 19
• Views: 4,646
12-17-2013, 04:06 PM
20. ### Concept of P value

Hi Guys Recently I started working towards improving my understanding of basic concepts of statistics and have read a few posts/books online about...

• Replies: 19
• Views: 7,058
09-26-2013, 06:51 PM
21. ### I need to solve step by step these statistic problems

I need to solve step by step these statistic problems, please do not use software, statistic tables are ok

• Replies: 19
• Views: 4,420
12-01-2014, 06:56 PM
22. ### Interaction test

I have a binary outcome and a binary independent variable, and am using an interaction test in SAS to determine whether sex (male vs female) modifies...

• Replies: 19
• Views: 4,997
02-03-2017, 03:28 AM
23. ### Expected Value of normally distributed random variables

Given two independent random variables Y and W. Where Y is distributed as N(0,1) and W is distributed as N(0.100). a) Show that E = 1 and E = 0...

• Replies: 18
• Views: 9,763
11-03-2011, 08:06 PM
24. ### Very long post - need help thanks

Dear All, I am writing to you because I have got a lot of troubles with some concepts regarding Generalised Linear Models. I need to understand...

• Replies: 18
• Views: 4,622
12-28-2011, 05:41 PM
25. ### Simple stats question I cant wrap my head around.

So this question relates the the Simple Risk Model which is (probability of risk event * probability of impact) * total loss = expected loss. L =...

• Replies: 18
• Views: 4,781
02-19-2012, 10:05 PM
26. ### Chi test and regression

Hello everybody I have to test whether there is a significant difference between two groups. I want to indicate that among the two groups are no...

• Replies: 18
• Views: 3,385
12-07-2012, 03:23 AM
27. ### 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: 11,070
08-24-2012, 01:28 PM
28. ### effect size to report or not

I challenged a prof today and I said that an effect size should not be reported for non significant results. He strongly disagreed. What are your...

• Replies: 18
• Views: 17,745
10-10-2012, 03:15 PM
29. ### Study Design Question

I have a study design question for you. I'm designing a study that will implement a bully prevention program into schools. The study will consist of...

• Replies: 18
• Views: 3,074
11-06-2012, 03:29 PM
30. ### Average

Hi... I have an average rainfall,minimum and maximum temperature data.so can I find average value of this three variable?Is it meaningful? ...

• Replies: 18
• Views: 3,139
02-21-2013, 02:25 AM
31. ### if else as publishable equation

I'm camping but thinking about a score measure. I can write it as R code via:if(n > 0) {0} else {1} How would this be represented as an equation...

• Replies: 18
• Views: 3,120
10-11-2013, 10:38 PM
32. ### Removing outliers - endless story?

I've been collecting some data for the first time, investigating differences between three groups of people and their numbers of hospital visits....

• Replies: 18
• Views: 3,459
05-08-2015, 08:24 AM
33. ### Urgent help please - Can I use spearmens rank? Simple Q!

So I want to compare two variables and see whether there is a relationship (correlation). I've changed this slightly to my actual problem but the...

• Replies: 18
• Views: 2,984
12-13-2015, 06:53 PM
34. ### Which book would you buy ?

I found 2 books at Amazon.com. Both are about linear regression. Both have good overall ratings. Book A has the following ratings: 5 5 5 4 4 3 3...

• Replies: 18
• Views: 4,188
02-18-2016, 08:38 PM
35. ### Help with normal distribution

Hello friends of the forum I have the following doubt ... If I have a sample of only 24 discrete data, how can I prove that these data follow a...

• Replies: 18
• Views: 4,293
02-06-2017, 11:16 PM
36. ### r and p in regression

Hi John: I am still not clear about a regression graph. When r is 0.66 and p-value is 0.02, this is moderate to strong correlation and real,...

• Replies: 17
• Views: 4,014
03-19-2006, 01:38 PM
37. ### Need major help in this statistics problem

When looking at my text book. To answer the A, B, and C. at the bottom, we had to refer to our previous question in our book to help us with the...

• Replies: 17
• Views: 25,471
05-27-2008, 07:59 PM
38. ### Differences between 3 categories based on continuous and categorical predictors

Hello, Hoping someone can point me in the right direction. I originally collected data for use in a paired logistic regression to determine...

• Replies: 17
• Views: 5,958
05-21-2009, 06:32 PM
39. ### sample proportion of a binomial distribution

All, I am trying to figure out the probability (using a binomial distribution) that a sample proportion (4/100) will be greater than or equal to...

• Replies: 17
• Views: 10,309
01-31-2010, 04:43 PM
40. ### Is Central Limit Theorm true for other statistics

Dear friends, I have a question regarding Central Limit Theorem (CLT): Is Central Limit Theorm (CLT) true for other statistics such as variance,...

• Replies: 17
• Views: 6,951
07-08-2012, 09:37 AM
41. ### Chi square? Is it the right test for this case?

Hi all, I performed a simple experiment and I got a clear result. I need to know if there is a way to establish if this result is dued to the case...

• Replies: 17
• Views: 6,858
06-12-2010, 12:46 AM
42. ### Help, normal distribution-related problem

Marks in a nationwide examination have a normal distribution with mean 53.4 & standard deviation of 8.8. It is decided to give an A grade to the best...

• Replies: 17
• Views: 4,733
03-07-2011, 10:36 AM
43. ### Help with a problem on confidence interval for means

My homework problem is as follows: “The weight of salmon in two different rivers are normally distributed with mean μ1, μ2, respectively, and...

• Replies: 17
• Views: 4,238
06-01-2011, 09:48 PM
44. ### Which test with multiple categories? (Newbie)

Reposting since I got no response in the SAS forum. I'm a stats newbie. Let's say you want to document the amount of drug X used in 10...

• Replies: 17
• Views: 4,717
10-03-2011, 11:24 AM
45. ### Derive Expected Value of Yhat

Yhat = 1/n Derive E(Yhat) and show that Var(Yhat) = ((1.25σ^2)/n) I don't know how to work with the constants to get the Expected Value and...

• Replies: 17
• Views: 8,397
BGM
11-06-2011, 05:50 AM
46. ### 2IVs, multiple-levels; 1DV=frequency

EDIT: (in title I meant 2 IVs, not 2DVs!) - I fixed it for you - Dason Hi, I have a question: what test would be appropriate? IV = genotype,...

• Replies: 17
• Views: 4,396
11-18-2011, 03:49 PM
47. ### multiple linear regression: negative Y ?!

So I have my equation and it looks weird. The intercept is a small positive value and a lot of the co-efficients have large negative values. So that...

• Replies: 17
• Views: 7,567
02-22-2012, 01:27 PM
48. ### Standard Deviation Question

Hey there. I am losing my mind with a standard deviation question!! "The length of scenes (in seconds) showing tobacco use were recorded for...

• Replies: 17
• Views: 3,556
02-23-2012, 06:18 PM
49. ### Problem Involving Moment Generating Functions

Hi, I am working on this assignment and have no idea where to begin. I, however, am not asking for anyone to immediately provide an answer, as I...

• Replies: 17
• Views: 3,025
11-29-2012, 03:35 PM

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