An Insurance Company Selected Samples of Clients Under 18 Years

An insurance company selected samples of clients under 18 years of age and over 18 and recorded the number of accidents they had in the previous year.The results are shown below. $\begin{array}{ll}\text { Under Age of } 18 & \text { Over Age of } 18 \\n_{1}=500 & n_{2}=600 \\\text { Number of accidents }=180 & \text { Number of accidents }=150\end{array}$ We are interested in determining if the accident proportions differ between the two age groups.Let p_u represent the proportion under and p_o the proportion over the age of 18.The null hypothesis is

A) p_u - p_o $\le$ 0.
B) p_u - p_o $\ge$ 0.
C) p_u - p_o $\neq$ 0.
D) p_u - p_o = 0.