An Experiment Was Conducted to Compare the Mean Iron Content

question 15

Multiple Choice

An experiment was conducted to compare the mean iron content in iron ore pieces determined by three different methods: (1) mechanical, (2) manual, and (3) laser. Five 1-meter long pieces of iron ore were removed from a conveyor belt, and the iron content of each piece was determined using each of the three methods. The data are shown below. How should the data be analyzed? $\begin{array}{c}\hline \text { Piece Mechanical Manual Laser } \\ \begin{array}{ l l c l} \hline 1 & 69.26 & 70.29 & 69.23 \\2 & 74.36 & 74.86 & 75.38 \\3 & 69.24 & 69.30 & 70.58 \\4 & 67.26 & 67.29 & 67.13 \\5 & 62.12 & 61.14 & 63.08 \\\hline \end{array}\end{array}$

• A) randomized block design with three treatments and five blocks
• B) randomized block design with five treatments and three blocks
• C) completely randomized design with three treatments
• D) 3 × 5 factorial design

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