A Company Has a Contract to Supply Specialized Batteries to a Manufacturer

Multiple Choice

A company has a contract to supply specialized batteries to a manufacturer with a mean width of 54mm and a variance of 1.8 or less with an alpha of 0.05.The company randomly tests 20 of these batteries to ensure that they are meeting the requirements of the contract.What would be the null hypothesis each time the company conducts the test of the variances?

A) $\sigma$ ² = 0.05
B) $\sigma$ ² ≥ 1.34
C) s² = 1.8
D) $\sigma$ ² $\le$ 1.8
E) $\mu$ = 54