The National Bank of Zachary has opened up two new drive-through teller windows outside its main office building in downtown Zachary. The bank is not sure that it needs both windows open all days so...

The National Bank of Zachary has opened up two new drive-through teller windows
outside its main office building in downtown Zachary. The bank is not sure that it needs both windows
open all days so it has decided to conduct a work sampling study to 11:30 am and 1:00 pm to 3:00 pm.
The work sampling study was conducted at random over a 5-day period and the following
observations were recorded. Bank management wants the study to be 5 percent accurate with a 95
percent confidence level. How many additional sample observations should be taken? Table is attached.

Extracted text: ObservationTellers Idle Observation Tellers Idle 1 1 16 1 2 1 17 2 3 18 2 4 19 5 0 20 6 21 7 22 8 2 23 2 9 24 10 1 25 11 1 26 12 1 27 13 2 28 2 14 2 29 15 ㅇ 30 2 N N o 1 N N N C r o N O N o O o N r N N P