Chapter PIII, Problem 14RE

To determine

To find: that it is an observational study, sample survey or an experiment and all the parameter of this study and survey and types of conclusions could be reached on the basis of given data.

Explanation of Solution

Researchers have knowledge on bird spices. This was an observational study. It was neither retrospective study nor prospective study. In this study, the subjects are not chosen for retrospective study and previous conditions and habits are determined and prospective study is not given to the subjects to assess the potential outcome. There seems to be a relationship between the diameter of the bird's eye and the period of singing birds.