Brent, a pet supply store owner, is comparing the weights of two different breeds of dogs.
A sample of 41 adult male Pembroke Welsh corgis had an average weight of 11.85 kilograms.
A sample of 38 adult male border collies had an average weight of 17.11 kilograms.
Assume that the population standard deviations for the weights of Pembroke Welsh corgis and border collies are 1.35 kilograms and 2.12 kilograms, respectively.
Find the 90 % confidence interval for the difference in mean weights between Pembroke Welsh corgis and border collies.