Conduct a preliminary work sampling study in library / laboratory / ATM facility / any other facility and determine:

(a) Percentage of utilization of the facility in a day or week

(b) Percentage idle of the facility in a day or week

(c) Number of observations or sample size for 95.45% confidence level and 3% acceptable error.

Note: Use random number table for taking the observations (take 25 observations).

Use Microsoft Excel

Observation	Random number	Clock time	Working	Idle
1	8.43	8.43	x
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Total