Answer
We will reject the Null Hypothesis.
Work Step by Step
Using P-value approach, we have:
$t = \frac{\bar d - ยต_{d}}{s_{d}/\sqrt n}$
$ = \frac{-1.614 - 0}{1.915/\sqrt 7} = \frac{-1.614}{0.724} = -2.230$
df = 7-1 = 6
Using Student's t distribution table, we have:
P = 0.0336
Since P < 0.05, we will reject the Null Hypothesis.
