Answer:
option C and option E
Explanation:
IMO, data gathering is the collection of variable of interest in an established systematic fashion that enables one to answer stated research questions, test hypotheses, and evaluate outcomes.
A.Finding the mean weight of cancer patients in a study
Before finding the mean weight, data has already being gathered. In finding the mean weight, the values of the weight of the different cancer patients was already collected.
B.Graphing the heights of trees
Graphing is the process of plotting graphs with variables. These variables were already gathered.
C.Asking voters whom they will vote for
This activity is an example of data gathering. Variables are collected when the voters answers who they would vote for, in this process, data is gathered.
D.Using the results of a mathematical model to predict the next day's weather
These results to be used to predict the next day's weather was already gathered.
E.Weighing wildlife
During this process, fresh variables are collected while weighing the wildlife.