Which technique for gathering data observational study or ex

Which technique for gathering data (observational study or experiment) do you think was used in the following studies?

a. Rats with a disease are given a drug thought to help fight the disease. Certain rats are given 5 mg of the drug each day, and other rats are given 10 mg of the drug each day. The rats are administered the drug for a one month period. After that month, scientists study how well the drug helped fight the disease.

b. A poll is taken in which 500 randomly selected voters are asked who they will vote for in an upcoming election.

c. A traffic safety officer parks near an intersection and measures how fast the next 100 drivers go through the intersection.

d. One hundred obese children are asked to exercise one hour a day for one month. Once the month is over, researches measure the change in weight for these children.

Solution

a) experiment study as the scientists study how well the drug helped fight the disease

b) observational study, As the data is observed here

c) observational study

d) experiment study