True or False with reasons why? 1. Time series is a time ordered sequence of observations taken at Indefinite intervals

[answerhappygod]

True or False with reasons why?
1. Time series is a time ordered sequence of observations taken
at Indefinite intervals of time.
2. Decision analysis: A set of possible future conditions (of
a random variable) that is under the decision-maker's control and
will affect the decision results.
3. Forecasts are an essential input in the decision processes in
operations management because they provide information about future
demand.
4. Ranges Correlation coefficient is -1 to +1
+1 = two variables move together
in same direction
-1 = two variables move together
in opposite direction