An experiment was conducted in the UK measuring quality of life (measured based on a validated scale made up of 16 questions) for two groups. The experimental group was instructed to not use their sma

An experiment was conducted in the UK measuring quality of life (measured based on a validated scale made up of 16 questions) for two groups. The experimental group was instructed to not use their smartphone in their bedroom for a week, the while the control group was instructed to continue using it. The results are given below.

·        For the experimental group, test whether the true means differ (After-Before)

·        Repeat for th5e Control group