The following chart provides the number of iPhones sold (in millions) worldwide each year from 2014 to 2020. year 2014 2015 2016 2017 2018 2019 2020 iphones sold 125.1 150.3 169.2 213.2 211.9 217.7 196.9 (a) Determine the linear regression model that will best predict the number of iPhones sold (in millions) worldwide for a given year.   (b) How well does the linear regression model fit this sample data?   (c) Use the linear regression model to predict the number of iPhones sold (in millions) worldwide during the year 2021.

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