QUESTION 2 South Africa Airways would like to monitor its airline's performance. Each week for the past 20 weeks, they checked each week a random sample of 100 flight arrivals for "one-time" performance. The table that follows contains the number of flights that did not meet South Africa Airways definition of "one time": Week Late flights 10 9 11 39103422822 10 11 12 13 14 15 16 17 18 19 20 19 2.1 Which control chart is appropriate to analyze the above data? Justify your answer. 2.2 Calculate the upper and lower control limits for this chart @ 99.73% confidence level. 2.3 Draw the chart and interpret it. (3) (10) (9) QUESTION 3 Two machines are currently in use in a process at a local manufacturing plant. The standards for this process are LSL 400 and USL .403. Machine One is currently producing with mean .401 and a standard deviation 0004. Machine Two is currently producing with mean = 4015 and a standard deviation = .0005. 3.1 Which of the two machines is capable based on the capability index? QUESTION 4 (10)
QUESTION 2
South Africa Airways would like to monitor its airline's performance. Each week for the past 20 weeks, they checked each week a random sample of 100 flight arrivals for "one-time" performance. The table that follows contains the number of flights that did not meet South Africa Airways definition of "one time":
Week
Late flights
10
9
11 39103422822
10
11
12
13
14
15 16 17 18 19 20
19
2.1 Which control chart is appropriate to analyze the above data? Justify your answer.
2.2 Calculate the upper and lower control limits for this chart @ 99.73% confidence level.
2.3 Draw the chart and interpret it.
(3)
(10)
(9)
QUESTION 3
Two machines are currently in use in a process at a local manufacturing plant. The standards for this process are LSL 400 and USL .403. Machine One is currently producing with mean .401 and a standard deviation 0004. Machine Two is currently producing with mean = 4015 and a standard deviation = .0005.
3.1 Which of the two machines is capable based on the capability index?
QUESTION 4
(10)
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