Each person in random samples of 247 male and 253 female working adults living in Calgary, Canada, was asked how long, in minutes, his or her typical daily commute was (“Calgary Herald Traffic Study,” Ipsos, September 17, 2005). Use the accompanying summary statistics and an appropriate hypothesis test to determine if there is convincing evidence that the mean commute times for male and female working Calgary residents differ. Use a significance level of .05.

Males Females Sample Size x s Sample Size x s 247 29.6 24.3 253 27.3 24.0