t your spinach: Six measurements were made of mineral content (in percent) of spinach. It is reasonable to assume pulation is approximately normal. 19.1 20.5 20.6 21.3 20.8 19.1 Send data to Excel Part: 0 / 2 Part 1 of 2 Construct a 99.9% confidence interval for the mean mineral content. Round the answers to two decimal places. A 99.9% confidence interval for the mean mineral content is