The following data represent the muzzle velocity in feet per
The following data represent the muzzle velocity in feet per
The following data represent the muzzle velocity (in feet per second) of rounds ﬁred from a 155-mm gun. For each round, two measurements of the velocity were recorded using two different measuring devices, with the following data obtained:
(a) Why are these matched-pairs data?
(b) Is there a difference in the measurement of the muzzle velocity between device A and device B at the α = 0.01 level of signiﬁcance?
(c) Construct a 99% conﬁdence interval about the population mean difference. Interpret your results.
(d) Draw a boxplot of the differenced data. Does this visual evidence support the results obtained in part (b)?