When figuring a correlation coefficient, scores are first ...

[mmm]

When figuring a correlation coefficient, scores are first converted to Z scores because
 
  A) the standard deviation is the same for every variable.
  B) scores can never be more than 2 standard deviations from the mean.
  C) all scores are on a consistent 0 to 1 scale.
  D) high scores are positive numbers, and low scores are negative numbers.

Question 2

Since no environment can be more quiet than no noise at all, a survey of noise in various study environments found that noise scores tended to pile up at the low end, reflecting a(n) __________.
 
  Fill in the blanks with correct word

[ryansturges]

Answer to Question 1

D

Answer to Question 2

floor effect