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,
and accuracy.
b. How can the mean and standard deviation of the original data
be corrected?

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