The 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
794.6 790.4 792.6 793.8 794.9 790.7
796.3 786.1 793.5 789.6 803.2 794.6
?Construct a 99% confidence interval about the population mean difference. Compute the difference as device A minus device B.
Round three decimal places