I have body weights of two groups, over 5 weeks. First I want to calculate the mean and S.D. of the body weight of each week for each group. Then I want to plot them in a line plot, x axis = Weeks and Y axis = mean body weight, in a single graph. Please help. Also attaching the picture from the CSV file. I am also confused if it is a time series data. In all the time series data, I see they have used date. I dont have any dates in my data. Its Week1, Week2, Week3 and so on.