EWMA? What does it mean if the CUSUM didn't detect any shifts in mean but the EWMA did?

MARKETING 2018
19th Edition
ISBN:9780357033753
Author:Pride
Publisher:Pride
Chapter11: Product Concepts, Branding, And Packaging
Section11.1: Gaga: Not Just A Lady
Problem 1VC
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Whats the difference between the CUSUM and EWMA? What does it mean if the CUSUM didn't detect any shifts in mean but the EWMA did? 

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