statistical test

Hi, We are commonly have a problem where we do A/B test over a population of users but it seems like population sometimes differ even before the tests starts. So let's say I have over multiple days the KPI per group (control & test), how would you test for the treatment significance? This is...

Hello everyone I'm carrying out a research which tries to analyse factors affecting coffee consumption behavior, there are 7 independent variables on hand and 1 dependent variable which is coffee consumption behavior Is Multiple regression analysis can be used while there is relation among...

Hello All, I am currently analysing my experimental data on postharvest storage of pears. Lets say that I had 2 fcators (light treatment and cold storage duration). First, light treatment with 3 level of lighting intensity (0, 30 and 50 micromole per second). I grew my pears in this 3...

I am doing an investigation about the effect of altitude on the density of two tree species. Would it be possible to use the one-way ANOVA test to determine whether there is a statistically significant relationship between the density of beech and oak trees and altitude? If not, can low...

Dear friends, I'm now working on the recommendation system to recommend football match lottery to the users. The users may choose a match to bet arbitrary amount of money, e.g. $2, $4, or even $20,000. I want to compare if two recommendation algorithms are different (or if one outperforms...

Hi all, I just had a test with the following question, of which I doubt the 'correct' answer: Taking a level of significance of 5% in a hypothesis test and not rejecting the null hypothesis, is the same as saying: A. We are 95% confident that the results have occurred by chance B. We are 95%...

I am working on my independent action research project and need help figuring out what statistical test to use. I am looking at how my students' waste management knowledge and behaviors change pre- and post- survey. Usually, when I have done something like this, I run a paired t-test since...

I have data from three populations, 2 observations each populations (opinion poll data from different countries). I am trying to find out if any changes in opinion on the issue i am investigating are statistically significant. So, for one topic In 2010, Group 1 answered 20% yes, Group 2...

Hi Everyone, Pretty new to stats and want to make sure that I am running the right stats. I have means (measured in months) from multiple sites. My supervisor asked me to determine whether there are any site specific significant differences in these means. I am thinking that I should run a...

Hi, I need statistical test which would tell me which percent of variability in dependent variable is from given independent set of variables and which of unknown ones. Example: Model: Y = Model (X1, X2, X3, ....) Measurements of Y, X1 and X2 are given. I need test which tells me the portion...

Dear all, For my thesis, I would like to conduct a statistical test in SPSS to explain trade between the United States and 12 different regions, based on a couple of independent variables (both ratio and binary). I have seen that STATA is the best way to do this, however I have no experience...

I've collected data on the number of individuals of seven species at three different sites and want to test if there is a statistically significant difference between the three sites. The numbers are too small to use Chi square and I cannot make a 2x2 table for the Fisher's exact test. Are there...

I am developing different algorithms for a class of optimization problems. I have several problem instances in this class (some from real applications, some randomly generated), which do not differ in terms of structure, but in terms of data. I would like to compare the performance of my...

Hi! I have a single sample and asked them to think about their best and worst experiences in a class project. They answered identical sets of questions when considering the best project and again when considering the worst project. Here are the question examples: When thinking about your...

Hi, we just had an interesting discussion about the chi-squared test, that could be generalized. I think the core of the discussion was whether one should prefer a simple statistical test or a statistical model - e.g. a chi-squared test vs. a logistic regression. Given that in practice one is...

Hello, I need to fix the problem choosing and interpreting the correct statistical test for my data. I have data from (a) Minnesota Job Satisfaction Questionnaire short form (20 questions, answers from 1 (=very dissatisfied) to 5 (=very satisfied)) and (b) from Social Readjustment Rating...

Hi, My Chinese friend and I are trying to answer the following question: What are the mean weasel body weight per habitat and age class, for males and females, in the different seasons? We are still wondering which statistical test would be most appropriate. Crosstabs (Chi-square)...

My hypothesis is Gender and opinion on smoking is associated. I am using a likert scale (Strongly disagree..strongly agree) for the statement 'Smoking makes you look cool'. In SPSS, I have coded gender as nominal and the opinion as ordinal. I have to use a chi-square test but dont which box...

Dear all, I desperately in need! I have two samples (reports of 30 good and 30 bad companies). For each sample I classified statements in five categories (one being the "best" category, five being the "worst" --> ordinal scale). Within the categories, I have absolute frequencies. One example...

Hello everyone, I want to make one analysis to understand the behaviour of some stores: if there are some similars, which one are similars, etc. i am not sure about which statistical test i should use to solve one problem that i have. I have a data set with N stores and for each one i...