uppose you are a researcher in a hospital. You are experimenting with a new tranquilizer. You collect data from a random sample of 11 patients. The period of effectiveness of the tranquilizer for each patient (in hours) is as follows:

2.2

2.7

2.5

2.4

2.8

2.9

2.8

2.1

3

2.8

2.3

Construct a 80% confidence interval for the population mean length of time. Enter your answer as an open-interval, i.e., (#,#). Round upper and lower bounds to two decimal places.