Test the Claim That $\mu _ { \mathrm { d } } > 0$

Essay

Test the claim that $\mu _ { \mathrm { d } } > 0$ using the sample statistics below. Assume the samples are random and dependent,
and the populations are normally distributed. Use $\alpha = 0.01$ Sample statistics: $\mathrm { n } = 15 , \overline { \mathrm { d } } = 4.0 , \mathrm {~s} \mathrm {~d} = 0.2$