Longitudinal survey designs are also referred to as A) ...

[viki]

Longitudinal survey designs are also referred to as
 
  A) cross-sectional designs.
  B) panel designs.
  C) between-subjects designs.
  D) threshold designs.

Question 2

How do researchers determine what size sample is necessary?
 
  A) By estimating the variability of the characteristic of the population that they want to measure.
  B) By estimating the mean of the characteristic of the population that they want to measure.
  C) By estimating the reliability of the survey instrument.
  D) Both A and B

[rleezy04]

Answer to Question 1

Answer: B

Answer to Question 2

Answer: A