There are so many confounding variables here, the study doesn’t have a control group.
The study was made with kids from the same grade who “were convinced” to give up their phones, so basically it could be the study hypothesis is right but there’s a high change it could be anything else.
The study was made with kids from the same grade who “were convinced” to give up their phones, so basically it could be the study hypothesis is right but there’s a high change it could be anything else.