An Online Travel Agency Is Performing Market Analysis to Determine

An online travel agency is performing market analysis to determine how their sales have impacted brick-and-mortar travel agencies in key cities since its launch ten years ago. The table below contains the monthly number of airline tickets sold by a local travel agency in Grand Rapids, Michigan during the first four years of the online travel agency's business.
-(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.