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Question
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 (in minutes) for both samples are given below. The distribution of repair times for both brand A and brand B is highly skewed.Brand A 160 159 171 155 136 128 173 143
Brand B 125 160 140 131 119 123 135 134
What is the appropriate alternative hypothesis for this problem?
A. HA: DA is shifted to the left or right of DB
B. HA: DA is shifted to the right of DB
C. HA: DA is shifted to the left of DB
D. HA: DA is equal to DB
Answer
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