A researcher randomly selected 30 people to participate in a study to investigate which of two materials, A or B, used in the heels of sneakers will last longer. The researcher is considering two design types for the study. Design 1: Randomly assign 15 participants to wear sneakers with material A on their left feet and material B on their right feet. The remaining participants will wear sneakers with material B on their left feet and material A on their right feet.
Design 2: Randomly assign 15 participants to wear sneakers with material A on both feet and the remaining participants to wear sneakers with material B on both feet.
Which of the following best describes each design?
Design 1 is a completely randomized design, and design 2 is a matched pairs design.
Design 1 is a matched pairs design, and design 2 is a completely randomized design.
Design 1 is a matched pairs design, and design 2 is a matched pairs design.
Design 1 is a completely randomized design, and design 2 is a completely randomized design.