11-2. A medical researcher carefully measures the length of the fetal
humerus in 50 ultrasound studies by using electronically generated
distance-measuring “calipers” on the display. The researcher
obtains a mean value of 5.5 cm with a standard deviation of 2 mm.
After the measurements have been obtained, the researcher discovers
through studies of excised bone that the electronically
generated caliper measurements are consistently 2% larger than
the true length.
a. Describe the researcher’s original results in terms of bias, precision,
b. How can the mean and standard deviation of the original data