tests

Hi all, I am writing a project proposal: randomized, placebo-controlled crossover trial, I will be investigating treatment vs air. Participants will be asked to inhale the treatment or high-flow air (placebo). In this case, would a one-tailed test or a two-tailed test be more appropriate...

Hi everyone, So first let me give some background information on my study. Research question: Are there differences on helpfulness between online vinyl record reviews with the indication of a verified purchase and online vinyl record reviews without this indication? This indication of a...

Suppouse that we have a dataframe called dataWork with data from a database. There are several variables and 2 of them are: - Delay: time (minutes) to get to work (could be empty) - Nocturnal: 0 (work by day) 1 (work by night) we want to know the relation between delay and nocturnal. So...

Hi, I have a problems that at the beginning seemed easy, but now it looks trickier than expected. I have two series of responses (well different series, but all of them with the same characteristics). In one, the values are almost always zeros. In the other quite often I have a response...

Following this paragraph is my method to my research proposal. The next step I need to do is the planned analysis. I have absolutely no idea how to take the data from my research question (which for this class are fake numbers) and decide what to do with it. I know I need a test (T-test, ANOVA...

The question is as follows: " In a certain country: 10% of the families have no children 20% of the families have 1 child 30% of the families have 2 children 40% of the families have 3 children one child is randomly chosen from all the children in the country. X is a random variable whose...

Dear all, I am having trouble trying to find the right test for my research data, and I was wondering if somebody could help me out! These are the hypothesis: The development of any proprietary technology, processes or procedures by a new firm is likely to positively affect the number...

Hi Everyone, I'm doing a project that is evaluating the timeliness of emergency appendicectomies in a hospital. The literature states that delays beyond 24-48 hours significantly increase post-operative morbidity, complications and length of stay. I have two models to compare - one model...

Hello, I am struggling to find a suitable statistic test for one of my studies: I have 4 different conditions, and I want to test if my results differ on those conditions. When the dependent variable is continuous it is easy to find a statistical test; however when it is a categorical variable...