Use the Following Information for Questions

Multiple Choice

Use the following information for questions:
"Sunlight makes everyone feel better." To test this claim, 30 college students receive special lights for their bedrooms that slowly turn on in the morning with imitation sunlight. The experiment takes place in January, when it is still dark out in the morning. Prior to participation, the students fill out a questionnaire to measure their general mood. The average score was 2.73. After three weeks with the special light they fill in the questionnaire again. The average score this time was 3.13. The standard deviation of the differences was 0.822.
-Calculate a 95% confidence interval for the difference in average mood scores (after - before) .

A) (0.14, 0.66)
B) (0.09, 0.71)
C) (0.19, 0.61)
D) None of the above