Solve the problem.A controlled placebo experiment is said to be blind when
A. the members of the treatment group are told they are in the control group.
B. neither the members of the control group nor the members of the treatment group know to which of the two groups they belong.
C. none of the scientists conducting the study know which patients are in the control group and which patients are in the treatment group.
D. the members of the control group are told they are in the treatment group.
E. none of these
Answer: B
You might also like to view...
Solve the application problem.A water tank can be filled in 6 minutes and emptied in 8 minutes. If the drain is accidentally left open when the tank is being filled, how long does it take to fill the tank?
A. 
min
B. 24 min
C. 
min
D. 3
min
Solve.
.Find the area of the lot shown.
A. 25,391.1 ft.2 B. 6099.61 ft.2 C. 12,535.05 ft.2 D. 6267.525 ft.2
Give a number that satisfies the given condition.A number between -10 and 10 that is a real number but not not an integer
What will be an ideal response?
Perform the indicated operation.[ (5x2 + 2x + 7) - (2x2 - 3x - 3) ] - [ (3x2 + 4x - 6) + (-2x2 - 3x + 4) ]
A. 6x2 - 2x + 6 B. -2x2 - 2x + 20 C. 2x2 + 4x + 12 D. 2x2 - 2x + 12