Question Annual sales (in million taka) by a chain shop are provided below. Year 2010 2011 2012 2013 2014 2015 2016 2017 2018 Sales

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Annual sales (in million taka) by a chain shop are provided below.
Year
2010
2011
2012
2013
2014
2015
2016
2017
2018
Sales
6
8
12
18
15
13
16
12
10
(a) Estimate first order autocorrelation function ?(1) and use this to comment on the properties of the time series.
(b) Obtain forecast for the year 2019 from the trend model ?̂?=5.48+4.52?−0.50?2.

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