Geometric Mean and Pythagorean Theorem Practice

Find x and y. Round to the nearest tenth.

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

What is the domain of the step function f(x)=[2x]-1?

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?