## Statistics (12th Edition)

Null hypothesis is that the the mean time on the Trail Making Test for schizophrenics is equal to that of normal persons. Hence: $H_{o}: µ_{1} = µ_{2}$ or $µ_{1} - µ_{2} = 0$ $H_{a}: µ_{1} > µ_{2}$ or $µ_{1} - µ_{2} > 0$