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)?
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