Answer
We have sufficient evidence that Internet users spend less time watching television.
Work Step by Step
Here we have $H_{o}$: μ = 154.8, $H_{a}$: μ < 154.8, n = 50, x̅ = 128.7, s = 46.5 and α = 0.05
Using the classical approach:
Using Table VI, we have: t = 1.677
$σ_{ x̅} = \frac{s}{\sqrt n} = \frac{46.5}{\sqrt 50} = 6.576$
$t = \frac{128.7 - 154.8}{6.576} = -3.97$
Since, -3.97 < - 1.677, we reject the Null hypothesis.
