In a study, mice were split into 2 groups: one group ate all…

In a study, mice were split into 2 groups: one group ate all their food at night, and the other ate all their food during the day.   Researchers tested whether the mice who ate at night gained more weight than mice who ate during the day.    Hypotheses:  H0:  μ1=μ2    and      Ha: μ1>μ2 What would it mean to make a Type II error in this situation?