From 2010 to 2015, a group of researchers conducted an experiment using two types of pain medication: pill A and pill B. The researchers gave the doctors the puis
in unidentified packages so they would not know which package was pill A and which package was pill B. The patients participating did not know which pill they
received either. What is this an example of?
A. The effect of a treatment unit
B. The placebo effect
C. A control group study
D. A double-blind study
E. Voluntary response bias

b) the dogs need to shift their focus to human scent.

answer: no, but if it does it's a obvious pattern.

step-by-step explanation:

answer: you need the equation in the question so i can answer it

step-by-step explanation:

answer:

total cost for tiles and paints is $924.  

step-by-step explanation:

we have been given that a community hall is in the shape of a cuboid. the hall is 40m long 15m high and 3m wide.

the paint will be required for 4 walls and ceiling.

let us find area of walls and ceiling.

therefore, the area of walls and ceiling is 1410 square meters.

given: cost for 10 litre of paint is $10 and 10 litre paint covers 25 square meter. therefore,

therefore, the total painting cost is $564.

tiles will be required for floor. let us find the area of floor.

given: 1m squared floor tiles costs $3. so,

therefore, the total tiles cost is $360.

now let us find combined total cost of tiles and paint.

therefore, the combined total cost of tiles and paint is $924.