The only time the range may equal zero, is when
a. the standard deviation is less than 1.00
b. every score in the distribution is the same
c. the standard deviation is negative
d. the interdecile range is skewed to the left
Question 2
Advanced topic: What does it mean when SSTotal minus SSError equals zero?
A) This is the best caseit means there is zero error.
B) This is the worst caseit means the prediction model has reduced zero error.
C) The proportionate reduction in error is 50.
D) The underlying correlation is negative.
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