what is the blocking variable?

Montreal Mini-Covid Hospital is serving COVID-19 patients. The hospital is receiving 20 patients per hour for COVID test. At any given time, there are 5 patients waiting in line while the front desk is serving each patient in 3 minutes and directing 50% of patients to Dr. John and 50% of patients to Dr. Mary. At any given time, there are 15 patients in Dr. John's waiting room while he is serving each patient in 4 minutes and admitting 20% of his patients for treatment. Likewise, at any given time, there are 8 patients in Dr. Mary's waiting room while she is serving each patient in 5 minutes and admitting 15% of her patients for treatment. All details are presented in the process diagram below: Dr. John (GP) 20% Admit Service time = 4 min Waiting patients = 15 Patients 50% 80% 20 / hour Front Desk Waiting Patients - 5 Service time = 15%, 3 min 50% Don't admit Dr. Mary (GP) Service time = 5 min 85% Waiting patients = 8 How long in minutes, does an admitted patient spend in the system on…

If there are three kinds of cat food an experimenter will be feeding to cats and measueing the amount, they are feed, to then predict the number to active minutes the cat has in a day. They want to include the kind of cat food as a dummy variable. (a) Propose a scheme with 2 dummy variable in addition to the constant that would work and show it works? (b) Do the following propsed dummy variable schemes work? (show your work)