A Copy Machine Service Company Provides Maintenance and Repair Service

Essay

A copy machine service company provides maintenance and repair service for different types and brands of copiers.The manager of the repair department wants to know if the repair time for brand A is higher than the repair time for brand B.The manager randomly selected 8 repair records associated with brand A and 8 repair records associated with brand B.The repair times for both samples in minutes are given below.The distribution of repair times for both brand A and brand B is highly skewed. $$\begin{array} { l l l l l l l l l } \text { Brand A } & 160 & 159 & 171 & 155 & 136 & 128 & 173 & 143 \\\text { Brand B } & 125 & 160 & 140 & 131 & 119 & 123 & 135 & 134\end{array}$$
-What is the appropriate null and alternative hypothesis for this problem?