Final answer:
The weight of the rats' adrenal glands in the study is an example of a dependent variable measured on a ratio scale, which is useful for quantitative comparisons and statistical analysis.
Step-by-step explanation:
In the study referenced, the dependent variable is the weight of the rats' adrenal glands. This particular variable is measured on a ratio scale of measurement. Ratio scales are used for quantitative data and have a true zero point, which allows for meaningful comparisons of the differences in magnitude and calculations such as ratios. For example, if one rat's adrenal gland weighs 200 milligrams and another's weighs 100 milligrams, one could validly say that the first gland is twice the weight of the second. This property is essential in physiological studies like the one described, where researchers are typically interested in precise measurements that can be compared and analyzed statistically.