Question 9. 16 A customer was interested in comparing the top speed (in kilometres per hour) of two models of scooters. The customer selected two independent random samples of the scoot- ers and calculated the following summary information: Model A Model B Sample size 8 9 Sample mean 90 84 Sample standard deviation 3 5 (a)- (8pts) Test an appropriate hypothesis to verify whether or not the variances of the populations of the two models are equal. Use a = 0.01 (b)- (8pts) Do the data present sufficient evidence to indicate a difference in average top speeds between the two models. Test using a = 0.01