168 AZSTNTJAL REPORT SMITHSONIAN INSTITUTION, 1960 



About 2 p.m. each day the cars then parked in the Zoo are counted 

 and listed according to the State, Territory, or country from which 

 they come. This is, of course, not a census of the cars coming to the 

 Zoo but is valuable in showing the percentage of attendance by States 

 of people in private automobiles. Many District of Columbia, Mary- 

 land, and Virginia cars come to the Zoo to bring guests from other 

 States. The tabulation for the fiscal year 1960 is as follows : 



Percentage 



Maryland 32. 3 



Virginia 23. 



District of Columbia 20. 5 



Pennsylvania 3. 5 



New York 2. 5 



North Carolina 2. 



New Jersey 1. 6 



Ohio 1. 5 



West Virginia 1. 1 



Florida 1. 1 



Massachusetts . 9 



Percentage 



California 0. 7 



Connecticut . 7 



Michigan • 7 



South Carolina . 6 



Illinois . 6 



Tennessee . 6 



Texas . 4 



Georgia . 4 



Indiana . 4 



Total 95. 1 



The remaining 4.9 percent came from other States, Arabia, Azores, 

 British Columbia, Canal Zone, Cuba, England, France, Guatemala, 

 Germany, Japan, Manitoba, Mexico, Morocco, New Brunswick, New- 

 foundland, Nova Scotia, Okinawa, Panama, Puerto Rico, Virgin 

 Islands, and Yugoslavia. 



On the days of even small attendance there are cars parked in the 

 Zoo fi-om at least 15 States, Territories, the District of Columbia, and 

 foreign countries. On average days there are cars from about 22 

 States, Territories, the District of Columbia, and foreign countries; 

 and during the periods of greatest attendance the cars represent not 

 less than 34 different States, Territories, and countries. 



Parking spaces in the Zoo now accommodate 1,079 cars when the 

 bus parking place is utilized and 909 cars when it is not used. 



At the request of the Board of Regents of the Smithsonian Institu- 

 tion and the Commissioners of the District of Columbia, a survey 

 was made during the year to determine the residence of the visitors by 

 percentage. The work was done by the Zoo police under the guidance 

 of Albert Mindlin and Samuel Rosenthal, analytical statisticians of 

 the Management Office of the District of Columbia. 



Three categories of residence were listed : District of Columbia, sub- 

 urbs (the surrounding four counties), and the rest of the country. 

 Mr. Mindlin set up a method of sampling that was scientifically de- 

 signed and conducted to produce statistically valid and reliable re- 

 sults. To accomplish this a random sampling of all visitors in the 

 Zoo was to be taken from one spot in the Zoo. Following pre-test sur- 

 veys made in several spots scattered throughout the Zoo at various 

 times of the day, the spot finally selected was at the water fountain 



