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.If the most recent test had a variance of 1.9, what would be the critical value of this chi-squared test?
A)30.14
B)32.85
C)1.645
D)-30.14
E)-1.645

Question

Quizplus · Accepted Answer

The critical value for a chi-squared test with 19 degrees of freedom (n-1 = 20-1) and an alpha of 0.05 (for a one-tailed test) is approximately 30.14.

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