If a time series plot exhibits a horizontal pattern, then:
a. it is evident that the time series is stationary.
b. the data fluctuates randomly around a variable mean.
c. there is no relationship between time and the time series variable.
d. there is no sufficient evidence to conclude that the time series is stationary.
Question 2
True or False If a point is more than 3 sigmas away from the centerline, or if two out of three consecutive points are on the same side of the centerline and more than 2 sigmas away from it, the process is deemed to be in control.
Indicate whether the statement is true or false
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