1. Multiple choices. Please choose one or more choices for each question.

(1) Below are two statements about clustering analysis.

Statement 1: The optimal number of segments should be that has the lowest SSE on the

elbow chart.

Statement 2: Any two data points within the same cluster always have a shorter distance

than two data points from different clusters do.

Which of these two statements are true? ( )

A. Only Statement 1 is true.

B. Only Statement 2 is true.

C. Both Statement 1 and 2 are true.

D. Neither Statement 1 nor 2 is true.

(2) Which statement(s) is right about Bass model of product diffusion? ( )

A. The number of new adopters from the innovation channel is the highest at the

beginning of the diffusion process

B. The number of new adopters from the imitation channel is the highest at the beginning

of the diffusion process

C. The number of new adopters from the innovation channel is the highest at the peak

new adoption time of the diffusion process

D. The number of new adopters from the imitation channel is the highest at the peak new adoption time of the diffusion process