When a speaker delivers a speech without advance preparation, he/she is practicing ________ speaking

For many females adolescence is the time during which they shift attention from developing and asserting identity to pleasing others

Indicate whether the statement is true or false

In your sampling frame of The Real World episodes there is a bias in the way that the list is ordered. Every tenth episode on the list is the "goodbye episode" and every eleventh episode is the "introduction episode." What is this bias in the sampling frame called?

a. stratification b. weighting c. disproportionate sampling d. periodicity