comparing means

Hi! I have some data, and I am not sure which statistical test I should use. The data comes from a survey. In the survey the respondents (dentists) was presented for two different cases in which the cases differed slightly in how they would carry out an hypothetical case - would they perform...

Hi, I am looking to analyse some data I have collected for a piece of research. I wanted to evaluate the impact of a Mindfulness intervention upon the participants ability to be Mindful, as well as their levels of depression, anxiety and stress. My directional hypotheses were that the...

Hi all, hoping i can find some answers here for a bit of a problem i am having regarding a sample size calculation for a study I am soon to conduct. The population size is 64 and fixed. 32 control and 32 intervention. No drop outs will occur in this trial. There will be a pre (baseline) test...

I have data collected each year from 2010-2015. In this data I have demographic information and a self-reported score on a 5 pt Likert scale. The surveys were anonymous but I know that many of the same people were surveyed each year. I would like to compare the self-reported score across years...

Hello all, I would like some feedback on the right approach of analysing data, comparing means of groups of data. Currently I work with the following 5 steps to analyse my data. Is this approach correct or how do you analyse your data if you do it differently? 1) I test for normality...

Hi there I have prospective study looking at functionality after an injury; let's say a big toe injury. I have the injured group (N=44) that has suffered an injury on one big toe (the other foot is "non-injured"), and control group with healthy toes (N=15). I have a functionality score for the...

I have two easy, but for me at this point rather devastating, questions I was hoping for one kind hearted or bright individual,or two, to reply on. I'm doing a study with data from a national representative population study. The design is cross-sectional. I've run into serious troubles with...

Dear All I am a language teacher, and am confused about what test to use for my study. I have test scores of five skills. I want to know which skills my students are good at and which skills they are poor in. Any test of comparison that could help me????? Please respond Rashid

1). The average number of pages for a simple random sample of 20 physics textbooks is 435. The average number of pages for a simple random sample of 25 mathematics textbooks is 404. Assume that all page length for each types of textbooks is normally distributed. The standard deviation of page...

Hi I'm writing a protocol and need help to determine what analyses I would need to conduct. I am looking at the effects of false negative prenatal screening on parents of children with Down's Syndrome. I have three groups to compare; those who received the FN results, those who were offered...