Anew drug is being tested on mice. one dozen mice are given the new drug and tested, while another dozen mice are not given anything and tested. what kind of data collection is this?

Here Sample Survey is used.

Step-by-step explanation:

Since, they did not survey on all mice only the dozen mice are used in the survey. So, here Sample Survey methodology is used.

The sample is a subset of the population. We take samples because it is easy to analyze samples as compared to population and it is less time taken. Further, the sample is said to be best sample if it is the representation of the whole population.

Further, here Case-Control Study is used. Since drug tested mice are compared with normal mice.

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.

step-by-step explanation:

your answer is a