For example: { 1 + 1i } is valid whereas { 1 + i } is not. { 0 + 9i } is valid whereas { 9i } is not.
Mothers Against Drunk Driving( MADD) is a very visible group whose main focus is to educate the public about the harm caused by drunk drivers. A study was recently done that emphasized the problem we all face with drinking and driving. Five hundred accidents that occurred on a Saturday night were analyzed. Two items noted were the number of vehicles involved and whether alcohol played a role in the accident. The numbers are shown below:
Number of Vehicles Involved
Did alcohol play a
1 2 3 role?
Yes 60 110 30 200
No 40 215 45 300
100 325 75