Answer
$k\gt critical~value$: null hypothesis is not rejected.
There is not enough evidence to conclude that the Zestimate is inaccurate.
Work Step by Step
$H_0:~M=0$ versus $H_1:~M\ne0$
$number~of~plus~signs=3$
$number~of~minus~signs=7$
$n=3+7=10$ (small sample)
Two-tailed test:
$Critical~value=1$
(According to table XI, for $n=10$ and $α=0.05$ (two tails))
$k=number~of~plus~signs=3$
Since $k\gt critical~value$, we do not reject the null hypothesis.
