Question

A biologist is interested in finding the relationship between the amount of sunlight and the growth rate of sunflowers. Would an experimental or observational study design be more appropriate?.

An experimental study should be used with the growth rate of the sunflowers as the controlled factor.

An observational study should be used because the amount of sunlight cannot be controlled.

An experimental study should be used with the amount of sunlight as the controlled factor.

An observational study should be used because the growth rate cannot be controlled.

Question

In a study to add a new feature to a software program, the programmer introduced two categories, men and women, in the survey she conducted. Is the study observational or experimental? If it is an experiment, what is the controlled factor?

The study is an experiment. The controlled factor is the feature to be added in the software.

The study is an experiment. The controlled factor is the category, men or women.

The study is an observational study.

Solution

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