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When I graduate from University or College as Americans call it, should I sell all my textbooks, or should I keep them for reference for my future work etc? I am doing an economics and statistics course, what do you think, should I keep the textbooks?

If a time series displays an increasing trend and additive seasonal variation, the magnitude of the seasonal swing increases as time advances. Is this true or false? This is not a homework question, it's just revision for my exam tomorrow, and I am unsure with this question. I have another...

If a time series displays an increasing trend and additive seasonal variation, the magnitude of the seasonal swing increases as time advances. Is this true or false? This is not a homework question, it's just revision for my exam tomorrow, and I am unsure with this question. I have another...