Answer
$t_0=2.52$ with a P-value $\ltα$. Reject the null hypothesis.
There is enough evidence to conclude that the number of televisions per household has increased since 2009.
Work Step by Step
$H_0: μ=2.9$ versus $H_1: μ\gt2.9$
Enter the data from StatCrunch survey in C1.
Select Stat -> Basic Statistics -> 1-Sample t
Select "One or more samples, each in a column". In the box above enter C1
Select "Perform hypothesis test". In "Hypothesized mean" enter 2.9.
Click Options and enter the level of confidence 95% and in "Alternative hypothesis" select Mean > hypothesized mean. Click OK.
Click OK.
$t_0=2.52$ with a P-value $=0.006\ltα=0.05$. Reject the null hypothesis.
