Material 2503 1929 1512 2427 2575 2438 2430 2233 2042 1842 1501 1826 Small 2774 3163 2814 2464 2187 2288 2503 2276 2557 2241 2721 2083 Medium 3354 2920 2928 3658 2680 2522 Large 3328 3121 3306 3212 3003 2523 Size
Highway Signs. A driver’s ability to detect highway signs is an important consideration in highway safety. In his dissertation Highway Construction Safety and the Aging Driver (1994), Solomon Younes investigated the distance at which drivers can first detect highway caution signs. This distance is called the detection distance. An experiment was conducted to determine the effects that sign size and sign material have on detection distance. Four drivers were randomly selected for each combination of sign size (small, medium, and large), and sign material (1, 2, and 3). Each driver covered the same stretch of highway at a constant speed during the same time of day, and the detection distance (in feet) was determined for the driver’s assigned caution sign. The data in the following table are based on the results of the experiment.
a. the response variable
b. the factors
c. the levels of each factor
d. the number of treatment combinations
e. the experimental units
f. the number of observations for each treatment combination
g. the experimental factors, if any
h. the classification factors, if any
i. whether the study is a designed experiment or an observational study
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