Question: DO NOT USE AI! SHOW YOUR WORK WHEN ANSWERING, INCLUDING CALCULATIONS AND EXCEL WORK! question: Consider the following time series: 5, 20, 30, 42, 58,

DO NOT USE AI! SHOW YOUR WORK WHEN ANSWERING, INCLUDING CALCULATIONS AND EXCEL WORK!

question:

Consider the following time series: 5, 20, 30, 42, 58, 67, 79, 89. Use first-differencing to make another time series (this one would start with 20-5=15 and will have eight terms). Use Copilot prompts to calculate the first-order (lag 1) correlation for this new time series and report this value here (if you have trouble with Copilot, feel free to research how to calculate this using Excel.). Please explain the meaning of this value.

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