Random digit dialing is a sampling techniques that was developed ...

[TVarnum]

Random digit dialing is a sampling techniques that was developed in order to _____.
 
  a. obtain random samples c. check internal validity
  b. obtain matched samples d. check external validity

Question 2

In order to estimate the ratio of white to black students in his college, a professor determines the proportion of whites and blacks in his class. The resulting proportion is called a _________.
 
  a. population c. parameter
  b. sample d. statistic

[aham8f]

Answer to Question 1

A
Random digit dialing is used in order to obtain random samples. The last four digits of a phone number are dialed randomly, thereby making it equally likely that any one number with a certain exchange will be dialed.

Answer to Question 2

D