Regular consumption of presweetened cereals contributes to tooth decay, heart disease, and other degenerative diseases, according to research studies. In a random sample consisting of 21 similar single servings of a certain sugary cereal, the average sugar content was 11.6 grams with a standard deviation of 2.47 grams. Assuming that the sugar contents are normally distributed, construct a 99% confidence interval for the mean sugar content for single servings of that sugary cereal. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. Click here to view page 1 of the table of critical values of the t-distribution. Click here to view page 2 of the table of critical values of the t-distribution. < < < The confidence interval is (Round to two decimal places as needed.)