Lifetimes of Engine Control Modules Chin manages the service department of a trucking company. Each truck in the fleet utilizes an electronic engine control module. Long-lasting modules are desirable. A preventive replacement program also avoids costly breakdowns. For this purpose it is desirable that the modules be fairly consistent in their lifetimes, so that preventive replacements can be timed efficiently. Chin tested a sample of 20 Brand A modules, and they lasted 48.560 highway miles on the average (mean), with a standard deviation of 2116 miles. The listing below shows how long each of another sample of 20 Brand B modules lasted. Use these data for Exercises 38-40 44.660 51.300 45.680 48.840 47.510 61.220 49.100 48.660 47.790 47.210 48.050 49.920 47,420 45,880 50.110 52.910 47.930 45.800 46.690 49.240 According to the sampling, which brand of module has the longer average life (in highway miles)?
Lifetimes of Engine Control Modules Chin manages the service department of a trucking company. Each truck in the fleet utilizes an electronic engine control module. Long-lasting modules are desirable. A preventive replacement program also avoids costly breakdowns. For this purpose it is desirable that the modules be fairly consistent in their lifetimes, so that preventive replacements can be timed efficiently. Chin tested a sample of 20 Brand A modules, and they lasted 48.560 highway miles on the average (mean), with a standard deviation of 2116 miles. The listing below shows how long each of another sample of 20 Brand B modules lasted. Use these data for Exercises 38-40 44.660 51.300 45.680 48.840 47.510 61.220 49.100 48.660 47.790 47.210 48.050 49.920 47,420 45,880 50.110 52.910 47.930 45.800 46.690 49.240 According to the sampling, which brand of module has the longer average life (in highway miles)?
Solution Summary: The author explains how to calculate the longer average life of the two brands by using the data mentioned below.
Lifetimes of Engine ControlModules Chin manages the service department of a trucking company. Each truck in the fleet utilizes an electronic engine control module. Long-lasting modules are desirable. A preventive replacement program also avoids costly breakdowns. For this purpose it is desirable that the modules be fairly consistent in their lifetimes, so that preventive replacements can be timed efficiently.
Chin tested a sample of 20 Brand A modules, and they lasted 48.560 highway miles on the average (mean), with a standard deviation of 2116 miles. The listing below shows how long each of another sample of 20 Brand B modules lasted. Use these data for Exercises 38-40
44.660
51.300
45.680
48.840
47.510
61.220
49.100
48.660
47.790
47.210
48.050
49.920
47,420
45,880
50.110
52.910
47.930
45.800
46.690
49.240
According to the sampling, which brand of module has the longer average life (in highway miles)?
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