Are age and week of first symptoms significant predictors of the number of days from admission to discharge? Firstly describe the relationships between each of the independent and dependent variables, and then identify which of the variables explain the largest amount of variation in number of days from admission to discharge. If researchers are mostly interested in the association between week of first symptoms and number of days from admission to discharge, why is the effect of age being examined (provide details relevant to your data)?

I am doing an analytical plan that outlines which of those variables are dependent or independent, the null and alternative hypothesis, the univariate (histogram, etc) and bivariate analysis (box plot, etc), and the statistical test and assumption that is appropriate for this study. Would you be able to help me please?