3. A standard gold bar weighs exactly 12.4 kg. We have
two scales of unknown accuracy and precision. In particular,
unknown to us, using Scale #1, measurements of the bar’s weight act
like random draws from a ??(12.2, 0.05) distribution while, using
Scale #2, measurements of the bar’s weight act like random draws
from a ??(12.4, 0.2) distribution. Using each scale, we take 10
measurements and compute a 95% confidence interval for the true
weight of the bar. Neither includes...