(A)Is This Time Series Random? Perform a Runs Test and Compute

question 23

Essay

(A)Is this time series random? Perform a runs test and compute a few autocorrelations to support your answer.
(B)Does a linear trend appear to fit these data well? If so,estimate the linear-trend model for this time series,and interpret the value.
(C)Is there evidence of some seasonal pattern in these sales data? If so,characterize the seasonal pattern,and explain how to forecast future values.

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A chemical element used as a mood stabilizer in the pharmacological treatment of bipolar disorder and other mood disorders.

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Individuals who provide assistance and support to people with illnesses, disabilities, or other needs.

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Disturbing dreams that cause the dreamer to wake up feeling anxious and frightened.