Quality control. Westport operates daily round-trip flights between San Jose and Los Angeles using a fleet of three planes: the Viper, the Tiger, and the Eagle.

The budgeted quantity of fuel for each round trip is the average fuel usage, which over the last 12 months has been 150 gallons. Westport has set the upper control limit at 180 gallons and the lower control limit at 130 gallons. The operations manager received the following report for round-trip fuel usage for the period by the three planes.

a. Create quality control charts for round-trip fuel usage for each of the three planes for the period. What inferences can you draw from them'.'

b. Some managers propose that Westport present its quality control charts in monetary terms rather than in physical quantities (gallons). What are the advantages and disadvantages of using monetary fuel costs rather than gallons in the quality control charts?

Transcribed Image Text:

Trip Viper Tiger Eagle 123 1067 000 7681 156 155 146 141 141 156 146 144 167 4 152 161 156 5 156 138 183 161 170 177 167 149 189 186 159 171 9 173 152 176 10 179 140 185