Oakland passengers The scatterplot below shows the number of passengers departing from Oakland (CA) airport month by month since the start of 1997. Time is shown as years since 1990, with fractional...

Oakland passengers The scatterplot below shows the number of passengers departing from Oakland (CA) airport month by month since the start of 1997. Time is shown as years since 1990, with fractional years used to represent each month. (Thus, July of 1997 is 7.5—halfway through the 7th year after 1990.) (www.oaklandairport.com)