Question: 7. Indicate whether each of the following statements describes a stationary or a nonstationary series. a. A series that has a trend b. A series

7. Indicate whether each of the following statements describes a stationary or a nonstationary series.

a. A series that has a trend

b. A series whose mean and variance remain constant over time

c. A series whose mean value is changing over time

d. A series that contains no growth or decline

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