The whitefly, which causes defoliation of shrubs and trees and a reduction in salable crop yields, has emerged as a pest in Southern California. A study to determine factors that affect the life cycle of the whitefly was conducted in which whiteflies were placed on two different types of plants at three different temperatures. Each of the six possible treatment combinations was run using five cages, and the total number of eggs laid by the caged females was recorded. Temperature Plant 70F 77F 82F 47 37 35 45 21 21 55 32 32 Cotton 35 41 41 43 43 36 31 17 38 51 549 59 42 42 54 46 53 63 61 Cucumber 26 31 70 38 69 48 49 49 49 51 58 ANOVA Source of Variation 55 df MS F P-value F crit Plant 1,442.1333 1 1,442.1333 11.723 0.002 4.260 Temperature 411.4667 2 205.7333 1.672 0.209 3.403 Interaction 65.8667 2 32.9333 0.268 0.767 3.403 Within 2,952.4000 24 123.0167 Total 4,871.8667 29 (a) What type of experimental design has been used?