I need to calculate the mean and sd for the DV as a function of independent condition (placebo, weekly, and daily doses) and create bar graphs. I also need to run a simple pair t-test between placebo...

I need to calculate the mean and sd for the DV as a function of independent condition (placebo, weekly, and daily doses) and create bar graphs. I also need to run a simple pair t-test between placebo and daily nights only in participants who completed both nights.