The American Carbon Registry, www.americancarbonregistry.org, provides approved measurement methodologies for energy companies who wish to show greenhouse gas emission reduction through retrofitting high-bleed pneumatic controllers with low-bleed controllers. Summary sample data from the two manufacturers are shown in the table below. Are the variances of the two manufacturers equal?

Pneumatic Controller Methane Gas Emission (scfd)
Cemco	Invalco
s1 = 148.3	s2 = 235.1
n1 = 20	n2 = 19

(a)	Choose the appropriate hypotheses. Assume 12 is the variance of the manufacturer Cemco and 22 is the variance of the manufacturer Invalco.

	a. H0: 12 / 22 = 1vs. H1: 12 / 22 1
	b. H0: 12 / 22 1vs. H1: 12 /22 = 1

(b)	Calculate the critical values for = 0.10. (Round your answers to 3 decimal places.)

FR
FL

(c)	Calculate the test statistic Fcalc. (Round your answer to 3 decimal places.)

Fcalc