Every year, administrators of the San Francisco airport conduct a survey to analyze guest satisfaction. Download the 2011 data “2011_SFO_Customer_Survey.”

a) Visualize the responses of guests for “On-time status of flight” by STRATA (time of day). Note that to interpret the results, you will have to download the variable dictionary “AIR_DataDictionary_2011-SFO- Customer-Survey.” Also, be aware that the dictionary refers to the variable as “LATECODE” instead of “On-time status of flight.”

b) Visualize the responses of guests for “On-time status of flight” by DESTGEO. Note that to interpret the results, you will have to download the variable dictionary “AIR_DataDictionary_2011 SFO-Customer- Survey.” Also, be aware that the dictionary refers to the variable as “LATECODE” instead of “On-time status of flight.”