One group of ocean voyagers is given a new but untested pill for seasickness and a second group is given an inactive pill. Neither the voyagers nor the experimental researchers know which group has received the new pill. In this experiment, the investigators are making use of

Double blind technique

Explanation:

Double blind technique is used when neither the experimenter or participants doesn't know who is recieveing a particular treatment.

It is mostly used to eliminate bias when conducting a study, the two groups are placed under different treatment in other to ascertain the effect of a particular variable being studied on the study population.

i heard they are taking it off i hope this isn't true but otherwise if it doesn't get taken off it will probably be in early december or early january of 2018-2019

the answer to your question is,

d. when a child was born.

-mabel < 3