Answer
$T\lt T_α$: null hypothesis is rejected.
There is not enough evidence to conclude that $M_D\lt0$.
Work Step by Step
Left-tailed test.
Test statistic: $T=T_+=95$
Critical value: $T_α=100$
(According to table XII, for $n=25$ and $α=0.05$)
Since $T\lt T_α$, we reject the null hypothesis.
