When reading a paper of Fan, 2021, I found two things that I feel it is strange
They conducted a t-test and they argue the results as below
Simply speaking, Econ, Soci, Ecol, and Util are four dependent variables. They noted :
"Except for resource utilization, the treated group have undergone pronounced changes" resource utilization is Util in the Table
So I have two questions here: (1) Why they noted like that? I saw all variables changed statistically significant after event
(2) The t-test is used to assess the statistical significance of the difference in means between the treatment and control groups, and to determine whether this difference is likely due to chance or to the intervention. A statistically significant difference indicates that the intervention had a significant impact on the outcome variable, while a non-significant difference suggests that the intervention did not have a significant impact.
So, why the author dont compare the difference of means of treated group and control group before and after event but they did compared control group with control group before and after and compare treated with treated groups before and after event day.