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# How would I construct a 99% confidence interval about the population mean difference when computing the difference as device A minus device B if

How would I construct a​ 99% confidence interval about the population mean difference

when computing the difference as device A minus device B if following data represent the muzzle velocity​ (in feet per​ second) of shells fired from a​ 155-mm gun. For each ​shell, two measurements of the velocity were recorded using two different measuring​ devices, resulting in the following data.

Observation          1           2           3           4           5           6

A                        794.1    791.8    790.5    794.9    793.7    793.5

B                        798.3    791.9    798.1    796.5    799.1    798.0

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• How would I then compute the difference as device A minus device B.
• dam82ndab
• Aug 05, 2018 at 8:49am
• Thanks for write the difference is in the interval (-7.899, 0.099) as the interval contains the zero, the means of the two devices are equal. its difference is 0
• oflores31
• Aug 05, 2018 at 8:57am

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