Six Sigma Green Belt

Answer: B - Time-series analysis must be done with at least 50 data points in sequence.

Key Takeaway: Time-series analyses are done with at least 50 data points in sequence for them to provide inferential capability. This type of analyses provides information on trends decompositions and moving averages. For example, a weather prediction must take into account at least 50 consecutive days in any given season to provide prediction capability.