Which of the following statements is incorrect?
a. A time series describes how something changes over time, helping to identify patterns of change, rise, increase, fluctuation, growth, decline, and decrease.
b. A ranking relationship describes how a set of quantitative values relate to each other sequentially.
c. A deviation relationship describes how quantitative values are distributed across an entire range.
d. A correlation relationship describes whether and to what extent two paired sets of quantitative values relate to each other.