A biologist wishes to determine if there is a statistically significant difference in the mean weight of field mice found in the city and field mice found in the countryside. To do so, a sample of 63 city mice and 52 country mice is collected. The sample of city mice has a mean weight of 23.7 grams and a standard deviation of 4.1 grams. The sample of country mice has a mean weight of 21.6 grams and a standard deviation of 5.8 grams. Construct a 95% confidence interval for the true difference of means. Based on your CI, is there a statistically significant difference in the mean weights of these two groups of mice?