Complete the following:
Q1: Assume that both samples are independent simple random samples from populations having normal distributions.
Q2: A random sample of 13 four-cylinder cars is obtained, and the braking distances are measured and found to have a mean of 137.5ft and a standard deviation of 5.8ft. A random sample of 12 six-cylinder cars is obtained and the braking distances have a mean of 136.3ft and a standard deviation of 9.7 ft. Use a 0.05 significance level to test the claim that breaking distances of four-cylinder cars and braking distances of six-cylinder cars have the same standard deviation.