It is well known that the average stopping distance of vehicles is larger on a wet surface than on a dry surface. A student would like to test the theory that the variances in these stopping distances differs. A sample of 26 vehicles was tested under wet conditions leading to a sample variance of 48, whilst a sample of 16 vehicles was tested under dry conditions, leading to a sample variance of 20. You may assume that the two samples are from a normal distribution. Use a 5% level of significance to conduct your test