Question

1. Which one of the following terms refers to an experiment in which neither the patient who receives the treatment nor the person measuring the response knows which treatment the patient received?

   	a.	Double blind
   	b.	Randomization
   	c.	Control
   	d.	Replication

2. A fair coin means that P(Head) = 0.50 and P(Tail) = 0.50. Which one of the following gives a correct interpretation of this probability?

   	a.	If the coin is tossed four times then we will definitely get two heads and two tails.
   	b.	If the coin is tossed twice then we will definitely get one head and one tail.
   	c.	If several consecutive tosses result in heads then a tail is due, or is more likely, to occur.
   	d.	If the coin is tossed many times then approximately half of the tosses will be a head.

Answer 1

Here' the answer to the question. please write back in case you've doubts.

1. Double-blind study is a study in which neither the participants nor the experimenters know who is receiving a particular treatment. This prevents bias in research results. Hence, (a) is correct

2. The correct interpretation is point (d). a , b basically refer to only 2 or 4 tosses, whereas the definition of fair coin will only kick-in when the number of trials are many. Hence, (d) is correct