Question: Select each study as being either observational(O) or experimental(E). I. Children's behaviour in a play ground (aggression). II. Violence in children's TV programmes. III. Does fluoride in the water supply decrease the frequency of dental cases in a community compared to a similar community without such water treatment?
A ) I - O, II - O, III - E B ) I - E, II - O, III - E C ) I - O, II - O, III - O D ) I - O, II - E, III - E
Steps to derive
1 By observation, the behaviour of children (aggression) playing in a playground is known. So, observational study best suits in the first case.
2 The violence shown in children's TV programmes is known, if the content of the programmes is observed. So, observational study best suits in the second case also.
3 Experimental study is required to know whether fluoride in water supply decreases the frequency of dental cases in a community compared to a similar community without such water treatment.
