difference of means

Hello everybody I am doing some research in sleep medicine where I compare the test results of different sleep and vigilance tests. Within these different vigilance test results, the data is sorted in different patient groups. Since my data is non-normally distributed, I performed a...

Is there a way to create a bar graph, with multiple DVs, showing the difference between the means of the IV? I have two experimental conditions and would like to display the mean differences in one bar graph. The dependent variables are several different test scores and therefore each have a...

I compute the mean of the variable Y in 4 groups (A B C D) that differ for age, gender and body mass index (BMI). n=89 | n=375 | n=302 | n=166 | GROUP A | GROUP B | GROUP C | GROUP D | MALE 46...

Hi there :) This seems so simple I'm hoping someone can help me! :confused: I've got the mean values for no. effective alleles in 5 different populations of fish. So, 5 rivers, each with a mean value... and I'm trying to give a statistical value as to whether there are significant...

Hello everyone! Can someone please share their thoughts on the following question with me. Methods of hypothesis testing usually has a normality assumption for underlying data or for residuals in the case of regression. Why is this assumption important for either case; i.e. for...

Control: n=13, Mean=32.77, StDev=32.77, SEMean=3.328 Treatment: n=16, Mean=42.01, StDev=17.2, SEMean=4.3 Point Estimate for treatment - control = 9.24 df = 27 What is the 98% CI? I calculated the ME as 13.45 and the CI as (-4.21, 22.69) Is this correct?

Good day, I have been thinking over this exercize for a couple of hours now and I have trouble finding a starting point. Suppose that X1,i iid∼ N(µ1, σ²), X2,i iid ∼ N(µ2, σ²), that the samples are pairwise independent, and that σ is known. Derive a 1 − α confidence interval for µD = µ1 − µ2 I...

I'm working with two data sets and want to compare the difference of means between two particular rankings between two different years. My boss wants me to find a number to prove there is significant difference between these means. I am wondering if there is a statistics equation to find this...

Hello: I've never posted here before; hopefully this query isn't redundant. (I have tried to look through previous posts for an answer!). My problem involves difference of means, unequal sample sizes, and nested groups. The basics: I want to know whether the difference between two means is...