symptoms after the virus) show a reduction in symptoms after vaccination. I recruited 1000 patients who have received the vaccine and 1000 patients who did not receive the vaccine and ask them to rate their improvement in symptoms from their diagnosis to today (scale 1-10, where 10 is a big improvement). The shapiro-wilk test for normality had a p-value of 0.12 for the vaccinated patients and 0.33 for the non-vaccinated patients. Which two sample test should I use?
Correlation
Correlation defines a relationship between two independent variables. It tells the degree to which variables move in relation to each other. When two sets of data are related to each other, there is a correlation between them.
Linear Correlation
A correlation is used to determine the relationships between numerical and categorical variables. In other words, it is an indicator of how things are connected to one another. The correlation analysis is the study of how variables are related.
Regression Analysis
Regression analysis is a statistical method in which it estimates the relationship between a dependent variable and one or more independent variable. In simple terms dependent variable is called as outcome variable and independent variable is called as predictors. Regression analysis is one of the methods to find the trends in data. The independent variable used in Regression analysis is named Predictor variable. It offers data of an associated dependent variable regarding a particular outcome.
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