An army depot that overhauls ground mobile radar systems is interested in improving its processes. The shop floor supervisor believes that having standard work procedures in place will reduce the time required for troubleshooting this component. Time (in minutes) required troubleshootingthis component without and with the standard work procedure is recorded for a sample of 19 employees.
A. This is a one-tailed paired t-test.
B. This is a two-tailed test of two independent means.
C. This is one-tailed test of two independent means.
D. This is a two-tailed paired t-test.
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Assuming that we define our differences as Time without standard work procedure – Time with standard work procedure, the correct alternative hypothesis is
A. µ d = 0.
B. µ d < 0.
C. µ d > 0.
D. µ d ≠ 0.
The correct value of the test statistic is
A. 47.4
B. -6.70
C. 3.19
D. -0.36
The P-value associated with the test statistic is
A. 0.321
B. <0.0001
C. 0.05
D. 0.0233
At α = 0.05,
A. we reject the null hypothesis.
B. we fail to reject the null hypothesis.
C. we can conclude that having standard work procedures in place does not reduce troubleshooting time for this component.
D. Both A and C.
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