In Testing the Hypothesis $H _ { 0 } : \mu _ { D } = 5$

Essay

In testing the hypothesis $H _ { 0 } : \mu _ { D } = 5$ vs. $H _ { 1 } : \mu _ { D } > 5$ , two random samples from two normal populations produced the following statistics: $n _ { D } = 20 , \bar { x } _ { D } = 9 \text {, and } s _ { D } = 7.5$ . What conclusion can we draw at the 1% significance level?