A work sampling analyst notices that out of 50 observations, a worker is taking a break 2 times, chatting to a co-worker 2 times, and is absent from the workstation once. The analyst is 95% confident that the worker is actually working from _________% to __________% of the time. If the statement is changed to: the analyst is 95% confident that the worker is working from 87% to 93% of the time, what changes have occurred in the work sampling study?