Confidence Intervals Should Be Used with Caution with Time-Series Data

Multiple Choice

Confidence intervals should be used with caution with time-series data because ________.

A) it's difficult to keep track of the time for each sample
B) measuring the variance of time-series data is not possible
C) the mean and/or variance of time-series data are not stationary
D) it's difficult to measure the mean and/or variance of time-series data