A bakery company observes that Fridays are their busiest days in terms of selling white powder donuts, and that customers are increasingly ordering more donuts on Fridays. The manager of the bakery store, who has tracked the daily sales volume of these donuts for the past 6 months, wants to know how many donuts to have available on each Friday during the next months. How should she proceed? What additional data (if any) is needed? Which statistical analysis technique should be used? Can an analysis be performed? Why or why not?