In statistics, aconfidence interval(CI) is a type ofintervalestimate (of a population parameter) that is computed from the observed data. Theconfidencelevel is the frequency (i.e., the proportion) of possibleconfidence intervalsthat contain the true value of their corresponding parameter.

A medical lab technologist conducted glucose level analysis for a group of 20 patients and the results presented as below (the measurements are in percent):

3.66.95.14.25.57.23.05.84.99.9

5.46.24.56.38.25.74.47.93.27.1

6.96.25.44.54.25.45.56.35.74.4

3.65.87.93.27.19.98.23.07.24.9

Find the 98% confidence interval for the mean blood sugar level of the patients.