Question: Drive-through service time is an important quality attribute for fast food chains. The data in ServiceTime are the mean service times for Burger King, Chick-Fil-A,

Drive-through service time is an important quality attribute for fast food chains. The data in ServiceTime are the mean service times for Burger King, Chick-Fil-A, McDonald's, and Wendy's in 12 recent years. (Data extracted from bit.ly/qhvP3Zb.)
a. Construct sparklines of the mean service times for Burger King, Chick-Fil-A, McDonald's, and Wendy's in 12 recent years.
b. What conclusions can you reach concerning the mean service times for Burger King, Chick-Fil-A, McDonald's, and Wendy's in 12 recent years?

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