Is the model of Bernoulli trials plausible in each of the following situations? Discuss in what manner (if any) a serious violation of the assumptions can occur.

(a) Seven friends go to a blockbuster movie and each is asked whether the movie was excellent.

(b) A musical aptitude test is given to 10 students and the times to complete the test are recorded.

(c) Items coming off an assembly line are inspected and classified as defective or nondefective.

(d) Going house by house down the block and recording if the newspaper was delivered on time.