Shoe size data, collected at the beginning of the semester, can be separated according to gender. Let the WCU female population be represented by Mp , and the WCU male population be represented by My . The mean, standard deviation and sample size for both male and female shoe size date is shown in the table below: X S Female MF 8.4 1.29 17 Male UM 11.3 1.81 16 What is the lower boundary of a 90% confidence interval for the difference of population means HF - HM . Give your answer as a decimal rounded to 3 places after the decimal. Hint: Treat this as a t-interval. Use the conservative method for finding the degrees of freedom (n-1 of the smaller sample size)