There are two independent variables: Medication, which has two levels: “drug” or
ID: 3339561 • Letter: T
Question
There are two independent variables: Medication, which has two levels: “drug” or “placebo.” (“Drug” refers to the anti-cancer medication; “placebo” refers to an inert substance.) Type, which refers to the type of pancreatic cancer, and has two levels: “endocrine” and “exocrine.” Half the participants are given the drug, half the placebo. Within each of these groups, half the participants have endocrine pancreatic cancer, and half have exocrine.
44. Consider a variation on the design described above. One group of patients has endocrine pancreatic cancer, another group has exocrine. In each of these groups, all the patients receive the drug during one phase of the study, and receive the placebo during another phase. This new design is
a. 2x2 within-subjects
b. 2x2 between-subjects
c. 2x2 mixed design
Explanation / Answer
ANswer of question 43 here and explaination.
THe 2 X 2 within subjects design is not there as this design if for the same subjects. Here we sample population for each type of drug is different. No two tests are performed on a same person.So option A is incorrect.
The 2 X 2 mixed design will be valid if there will a time factor involved in it. Here all the test are conducted simultaneously on different people.
Here, the 2 x 2 between subjects design will be perfect design for this experiment as there are tests two different level for two different categories.
So, as per this explaination, Here as per given in question 43. Here in the problem, we have talked about phase or time interval in 2 x2 mixed designs. So given problem is a 2 x2 mixed design.
Option C is correct.