in a large sample of customer of customers account a utility company determined that the average number of days between when a bill was sent out and when the payment was made is 25 with a standard deviation of 4 days assume the data to be approximately bell-shaped between what two values will pack you mean I'm 95% of the numbers of days be approximately 95% of the customers account have payment made between and days

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?