Which of the following is an advantage of an observational study over a sample survey? a)observational studies are not dependent on people’s responses, which may not be truthful. b)observational studies involve the random selection of subjects. c)observational studies do not manipulate variables. d)observational studies do not involve treatments.

The table below lists recommended amounts of food to order for 10 party guests. how much of each food item should nathan and amanda order for a graduation party with 55 guests? use the table to answer. item amount fried chicken 16 pieces lasagna 7 pounds deli meats 1.8 pounds sliced cheese 1 and two fifths pounds bakery buns 1 dozen potato salad 2 pounds