Answer: A
Step-by-step explanation:
Since the standard deviation of the population is unknown, a t-distribution must be used
[tex]t=\frac{x_{bar}-u_o }{\frac{s}{\sqrt{n} } } \\\\t=\frac{13.88-14}{\frac{0.24}{\sqrt{16} } } = -2\\d.f=n-1=15\\P(t<-2) \ at\ 15\ d.f\\calculator...\\ p-value = 0.03197\\A) True\\Others are False[/tex]