Worldwide sales of iPhones® are shown in Table 12 for the last three months of various years.

Let s be worldwide iPhone sales (in millions) for the last three months of the year that is t years since 2005.
a. Identify the explanatory and response variables.
b. Construct a scatterplot by hand.
c. Graph the model s = 11.62t - 37.58 by hand on the scatterplot. Does the line come close to the data points?
d. Use the model to estimate worldwide sales of iPhones for the last three months of 2014. The actual sales were 74.5 million iPhones. Give a possible explanation of why analysts€™ pre- dictions of the sales turned out to be less than 74.5 million iPhones.
e. Compute the number of iPhones that were sold per hour throughout the day and night in the last three months of 2014 on average.

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Table 12 Worldwide Sales of iPhones in the Last Three Months of Various Years Year 2009 2010 2011 2012 2013 Worldwide Sales millions) 8.7 16.2 37.0 47.8 51.0