The following data represent the muzzle velocity (in feet per second) of rounds red from a 155-mm

Question:

The following data represent the muzzle velocity (in feet per second) of rounds ï¬red 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 Î± = 0.01 level of signiï¬cance?
(c) Construct a 99% conï¬dence 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)?