An Army Depot That Overhauls Ground Mobile Radar Systems Is

Multiple Choice

An army depot that overhauls ground mobile radar systems is interested in improving its processes.One problem involves troubleshooting a particular component that has a high failure rate after it has been repaired and reinstalled in the system.The shop floor supervisor believes that having standard work procedures in place will reduce the time required fortroubleshooting this component.Time (in minutes) required troubleshooting this component
Without and with the standard work procedure is recorded for a sample of 19 employees.In order to determine if having a standard work procedure in place reduces troubleshooting time, they should use

A) a test of two proportions.
B) a two-tailed test of two independent means.
C) a one-tailed test of two independent means.
D) a two-tailed paired t-test.
E) a one-tailed paired t-test.