Question

Two suppliers manufacture a plastic gear used in a laser printer. The impact strength of these gears measured in foot-pounds is an important characteristic. A random sample of 10 gears from supplier 1 results in x-bar1=289.30 and s1=22.5, and another random sample of 16 gears from the second supplier results in x-bar2=321.50 and s2=21. Is there sufficient evidence to conclude that the variance of impact strength is different for the two suppliers? Use a=0.05. Round numeric answer to 2 decimal places.

Since the test statistic, f0=_________

___is/is not___ in the rejection region, there ___is/is not___ sufficient evidence to conclude that the variance of impact strength is different for the two suppliers.

Answer 1