The expected return on a portfolio:

select one:

a. is an arithmetic average of the returns of the individual securities when the weights of those securities are unequal.

b. is limited by the returns on the individual securities within the portfolio.

c. can be less than the expected return on the worst performing security in the portfolio.

d. is independent of the performance of the overall economy.

e. can be greater than the expected return on the best performing security in the portfolio.

Penny poodle wanted to know which dog obedience training program was more effective: puppy pride, the approach she has been using for any years, or doggie do-right, a new approach. penny convinced 50 human companions of untrained dogs to participate in her study. the dogs and their humans were randomly assigned to complete the puppy pride or doggie do-right course. at the end of the training programs, all of the dogs were scored on their level of obedience on a standardized dog obedience checklist (scores could range from 10 to 100). the design of this study is: