Answer
$μ=35.1~million$ lies outside the confidence interval: null hypothesis is rejected.
There is enough evidence to conclude that the volume of Apple stock has changed since 2007.
Work Step by Step
$H_0: μ=35.1$ versus $H_1: μ\ne35.1$
Enter the data from Problem 25 in C1
Select Stat -> Basic Statistics -> 1-Sample t
Select "Summarized data". In "Sample size" enter 40. In "Sample mean" enter 23.6. In "Standard deviation" enter 11.7
Click Options and enter the level of confidence 95%. Click OK.
Click OK.
$Lower~Bound=19.86$
$Upper~Bound=27.34$
Since $μ\gt Upper~Bound$, we reject the null hypothesis.
