My question is asking me..."A sphere and a cylinder have the same radius and height. The volume of the cylinder is 18 centimeters cubed, what is the volume of the sphere"...I'm not entirely sure how to work this out pls help...i only have like 35 minutes left to do my test T-T

Aresearcher believes increased perceived control influence the well-being of residents at a nursing home. to test this , she allowed one group of residents to have control over their daily lies, (where to eat etc) . the other group of 5 residents had these deceisions made by staff. the resident's feelings of well-being were measured on a 10 point scale at the end of a one month trial period. is there a difference on well-being?