22. In a study of the average weight of babies at different time intervals of birth, the babies' measured weight is which of the following types of variable?
Answer: C
Babies' measured weight is a dependent variable.
In the context of the study, the weight of the babies is a dependent variable because it is the outcome being measured at different time intervals after birth. It depends on various factors such as age and growth, which are not controlled by the researchers.
A) Independent
An independent variable is one that is manipulated or controlled in an experiment to test its effects on a dependent variable. In this study, the weight of the babies is not being manipulated; rather, it is the response variable, making this option incorrect.
B) Constant
A constant variable remains unchanged throughout the study, ensuring that it does not affect the dependent variable. The babies' weight is not constant as it varies with time intervals, thus this option is incorrect.
C) Dependent
The babies' measured weight is indeed a dependent variable as it is the factor being observed and measured in response to time intervals. This makes it the correct choice for the type of variable being analyzed in the study.
D) Control
Control variables are the factors that are kept constant to ensure that the experiment measures only the effect of the independent variable. Since the babies' weight is what is being measured and not controlled, this option is also incorrect.
Conclusion
The correct answer is C) Dependent because the babies' weight fluctuates based on the time intervals after birth, highlighting its role as an outcome in the study. All other options fail to accurately describe the nature of the variable being measured, as they either mischaracterize the variable or do not apply to the context of this study.