New restaurant interested in determining the best time-temperature combination for roasting a five-pound cut of lamb. The times to be tested are 45 minutes, 60 minutes, and 50 minutes, with temperatures of 350 degrees Fahrenheit and 425 degrees Fahrenheit for each time, except for the 90-minute 425 degree combination, which will overcook the lamb. Five combinations remain. Ten identical cuts of lamb are randomly selected to roast using each of the time-temperature combinations in the same oven. The quality of the finished product is evaluated for each roast.
Which of the following is true?
a) The explanatory variable is the quality of the finished lamb.
b) The response variable is the roasting temperature for the lamb.
c) If the experiment is repeated, identical results will be expected.
d) There should be a control group (i.e., a group in which no treatment is given).
e) The two cuts that are being roasted for each time-temperature combination are an example of replication.