Table 2.

Data regarding cycling, age, and life satisfaction observed in a sample of a random 1% of children and random 10% of adults from the population shown in Table 1.

Population	Satisfied	Not Satisfied	Total
Children who cycle	50	50	100
Adults who cycle	750	250	1000
Total for cyclists	800	300	1100
Children who don’t cycle	25	75	100
Adults who don’t cycle	250	750	1000
Total for non-cyclists	300	800	1100
Total	1100	1100	2200

Risk Difference = 800/1100 – 300/1100 = 0.454