Professor Ziegenfuss of the Geology Department has ordered a new instrument that is supposed to measure the iron content of iron ore. After the instrument arrives, he uses it to measure the iron content of five test samples of ore, all of which are known to be exactly 16 percent iron. The numbers given by the machine on these five test samples are 8 percent, 3 percent, 28 percent, 16 percent, and 25 percent. Based on these measurements, one can conclude that the new instrument:

Question

Quizplus · Accepted Answer

The instrument is not reliable because it gives different readings for the same sample. It is also unbiased because the average of the readings is close to the true value of 16%.

Professor Ziegenfuss of the Geology Department Has Ordered a New