Chapter 9: Q82SE (page 522)
What is the difference between a one-way ANOVA and atwo-way ANOVA?
Short Answer
A two-way ANOVA has two independent variables, whereas a one-way ANOVA only has one factor or independent variable.
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Chapter 9: Q82SE (page 522)
What is the difference between a one-way ANOVA and atwo-way ANOVA?
A two-way ANOVA has two independent variables, whereas a one-way ANOVA only has one factor or independent variable.
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Explain the difference between an experiment that employs a completely randomized design and one that employs a randomized block design.
Define a comparison-wise error rate.
Robots trained to behave like ants. Robotic researchers investigated whether robots could be trained to behave like ants in an ant colony (Nature, August 2000). Robots were trained and randomly assigned to 鈥渃olonies鈥 (i.e., groups) consisting of 3, 6, 9, or 12 robots. The robots were assigned the task of foraging for 鈥渇ood鈥 and to recruit another robot when they identified a resource-rich area. One goal of the experiment was to compare the mean energy expended (per robot) of the four different colony sizes.
a. What type of experimental design was employed?
Performance of a bus depot. Refer to the International Journal of Engineering Science and Technology (February 2011) study of public bus depot performance, Exercise 9.25 (p. 544). Recall that 150 customers provided overall performance ratings at each of three different bus depots (Depot 1, Depot 2, and Depot 3). The average performance scores were determined to be significantly different at 伪=.05 using an ANOVA F-test. The sample mean performance scores were reported as
. The researchers employed the Bonferroni method to rank the three performance means using an experiment wise error rate of .05. Adjusted 95% confidence intervals for the differences between each pair of treatment means are shown in the table. Use this information to rank the mean performance scores at the three bus depots.

Forecasting electrical consumption. Two different methods of forecasting monthly electrical consumption were compared and the results published in Applied Mathematics and Computation (Vol. 186, 2007). The two methods were Artificial Neural Networks (ANN) and Time Series Regression (TSR). Forecasts were made using each method for each of 4 months. These forecasts were also compared with the actual monthly consumption values. A layout of the design is shown in the next table. The researchers want to compare the mean electrical consumption values of the ANN forecast, TSR forecast, and Actual consumption

a. Identify the experimental design employed in the study.
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