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
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