One of the greatest advantages of surveys is that researchers ...

[Engineer]

One of the greatest advantages of surveys is that researchers
 
  a. can examine variables that are difficult to observe directly.
  b. do not have to worry about whether their samples are representative.
  c. can be confident that respondents answered honestly.
  d. can be biased, but still collect objective information.

Question 2

If height and weight have a positive correlation, what does this tell you about the relationship between these variables?
 
  a. Height and weight are unrelated.
  b. Taller people are almost never heavier, but there are exceptions to the rule.
  c. Shorter people tend to be heavier.
  d. Taller people are usually heavier, but there are exceptions to the rule.

[johnharpe]

Answer to Question 1

Answer: A

Answer to Question 2

Answer: D