Construct a90% confidenceinterval. To test the effectiveness of a new drug that is reported to increase the number of hours of sleep patients get during thenight, researchers randomly select 13 patients and record the number of hours of sleep each gets with and without the new drug.

PatientSleep without the drug,Sleep using the drug

1 2.6 4.2

2 4.6 7.0

3 2.9 4.6

4 4.2 5.4

5 2.3 4.0

6 1.9 3.1

7 2.7 3.3

8 4.7 6.1

9 2.4 4.7

10 4.26.3

11 4.15.5

12 4.45.5

13 1.93.8