Some gardeners prefer to use nonchemical methods to control insect pests in their gardens. researchers have designed two kinds of traps and want to know which design will be more effective. they randomly choose 10 locations in a large garden and place one of each kind of trap at each location. after a week, they count the number of bugs in each trap. what type of study is this? experimental: randomized block experimental: completely randomized observational: comparative observational study observational: convenience because they used a garden that was convient for the researcher experimental: matched pairs