Determine the critical​ value(s). Select the correct choice below and fill in the answer box to complete your choice. ​(Round to two decimal places as​ needed.) A. plus or minus±z Subscript alpha divided by 2zα/2equals=plus or minus±nothing B. z Subscript alphazαequals=nothing

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?