Discussion:
Braking Distances of Cars
A random sample of 13 four-cylinder cars is obtained and the breaking distances are measured and found to have a mean of 137.5 ft and a standard deviation of 5.8 ft. A random sample of 12 six-cylinder cars is obtained and the braking distances have a mean of 136.3 ft and a standard deviation of 9.7 ft. Use a 0.05 significance level to test the claim that braking distances of four-cylinder cars and braking distances of six-cylinders cars have the same standard deviation.
[Let population 1 be six-cylinder cars.
H0:
H1:
Upper CV: F =
Test Statistic
Conclusion (i.e. decision) on H0:
Final Conclusion on the claim