Which of the Following Does Not Describe a Time Series

Multiple Choice

Which of the following does not describe a time series?

A) A time series is a record of a variable across time.
B) A time series is usually measured at equally spaced time intervals.
C) A time series is a data set on numerous individuals measured in units of time (for example, time until completion of the obstacle course; or time until graduation) .
D) All of the above describe a time series.