NOTE: There is not any data for these questions, so no data analysis required.Answer all questions based on the given scenarios.

Experimental Unit: The physical entity to which the treatment is randomly assigned or the subject that is randomly selected from one of the treatment populations (page 35 in our text).

Question 3

Scenario

A study was performed to investigate the effectiveness of several insecticides.One hundred insects of a particular species were put into a chamber and exposed to an insecticide for 15 seconds.The procedure was applied in random order six times for each of four insecticides.The response is the number of dead insects.

(a)What is the treatment structure?

(b)List all treatments:

(c)What is the experimental unit?

(d)What is the design structure?

Question 4

Scenario

A traffic engineer conducted a study on traffic delay at intersections with signals on urban streets.Three types of traffic signals were utilized in the study: (1) pretimed, (2) semi-actuated, and (3) fully actuated.A random sample of five intersections were used for each type of signal.The measure of traffic delay used in the study was the average stopped time per vehicle at each of the intersections (seconds/vehicle).

(a)What is the treatment structure?

(b)List all treatments:

(c)What is the experimental unit?

(d)What is the design structure?