A work sampling method is used to determine the proportion of the time a worker is idle. The following information was gathered on a random basis. 
If the manager wants a 95 percent confidence level (z = 1.96) and a degree of precision of + 0.03, how many more observations are needed?
Definitions:
Anode
The positively charged electrode by which the electrons leave a device.
Cathode
The electrode from which electrons exit a device or where positive ions enter.
Voltaic Pile
A group of voltaic cells connected together to form a battery.
Alessandro Volta
An Italian physicist known for inventing the battery in the 1800s, leading to the development of the first source of continuous electrical current.
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